Repository: dmitriz/llm-univ
Pull request #11: Refactor rate limit management and enhance functionality
Author: login: dmitriz
Labels: name: refactor
name: Review effort 4/5
Created: 2025-05-31T02:04:47Z | Merged: 2025-05-31T04:32:15Z

- Refactored rate_limits.js to prioritize real-time rate limit detection using API headers and endpoints.
- Updated provider rate limit configurations to include real-time detection methods and error response patterns.
- Introduced new utility functions for fetching current rate limits and monitoring rate limits via test requests.
- Added a pure functional implementation for rate limiting in rate_limit_functions.js, supporting token-based and request-based limits.
- Created a generic RateLimitManager class for reusable rate limit management in rate_limit_manager.js.
- Implemented utility functions for rate limit types and exponential backoff in rate_limit_utils.js.
- Updated tests in rate_limits.test.js to accommodate changes in rate limit configurations and structures.

## Summary by Sourcery

Refactor and enhance the rate limit module by shifting to pure functions and real-time detection, adding functional and class-based rate limit systems with monitoring and fetch utilities, extending provider configs with live headers/endpoints/error patterns, and updating tests and documentation accordingly.

New Features:
- Add fetchCurrentRateLimits(provider, apiKey) to retrieve live rate limit data from API endpoints
- Add monitorRateLimitsViaTestRequest(provider, apiKey) for real-time rate limit monitoring via test requests
- Introduce pure-functional rate limiting module (rate_limit_functions.js) supporting token- and request-based limits with multi-window tracking
- Create RateLimitManager class (rate_limit_manager.js) for reusable rate limit tracking and header parsing
- Add rate limit utilities (rate_limit_utils.js) including RATE_LIMIT_TYPES constants and calculateBackoffDelay with exponential backoff and jitter

Enhancements:
- Refactor rate_limits.js to prioritize real-time rate limit detection via API headers, endpoints, error responses, and fallback methods
- Extend provider configurations to include real-time detection details (headers, endpoints, error patterns) and update default tier data
- Update tests to accommodate new configuration keys (rateLimitHeaders, rateLimitEndpoint, quotaEndpoint, errorPatterns) in rate_limits.test.js
- Revise copilot instructions and FUTURE_TASKS.md to clarify terminal management policies and document rate limit validation tasks

Documentation:
- Revise FUTURE_TASKS.md with completed and pending tasks for rate limit URL validation and terminal instruction improvements
- Refine .github/copilot-instructions.md to improve and simplify terminal workflow guidelines

Tests:
- Adjust rate limit test suite to ignore new provider config keys when validating tier objects


Diff:
diff --git a/.github/copilot-instructions.md b/.github/copilot-instructions.md
index c204f83..2f51ec4 100644
--- a/.github/copilot-instructions.md
+++ b/.github/copilot-instructions.md
@@ -8,7 +8,6 @@
 2. CHECKING FOR ALL WARNINGS, ERRORS, AND VIOLATIONS
 3. REVIEWING ALL PROBLEM REPORTS
 4. FIXING ANY IDENTIFIED ISSUES
-5. VERIFYING FIXES WITH A SECOND TEST RUN
 
 ### 🚫 ABSOLUTELY FORBIDDEN:
 
@@ -20,29 +19,53 @@
 
 ## 🚨 CRITICAL - TERMINAL MANAGEMENT REQUIREMENTS 🚨
 
-### ❗️NEVER BLOCK THE TERMINAL:
+### ❗️🚫 NEVER BLOCK THE TERMINAL 🚫❗️
 
-1. **NEVER USE COMMANDS THAT BLOCK THE TERMINAL** (like `git log --oneline --graph --all --decorate`)
-2. **USE MCP SERVERS FOR RESEARCH** instead of terminal commands when possible
-3. **USE QUICK, NON-BLOCKING COMMANDS** for git operations
-4. **CHECK CURRENT STATE WITH SIMPLE COMMANDS** like `git branch` or `git status`
-5. **PRIORITIZE MCP SERVERS FOR ALL RESEARCH AND INFORMATION GATHERING**
+**Avoid commands that block, wait for input, or output massive amounts of text**
 
-### ✅ REQUIRED TERMINAL WORKFLOW:
+### 🚫 BANNED COMMANDS (WILL BLOCK TERMINAL):
 
-1. **USE MCP SERVERS FIRST** for any research or information gathering
-2. **USE ONLY ESSENTIAL TERMINAL COMMANDS** that execute quickly
-3. **NEVER USE BLOCKING OR LONG-RUNNING COMMANDS**
-4. **VERIFY COMMANDS WILL NOT BLOCK** before execution
+- `git log`, `git show`, `git diff` (without output limits)
+- `less`, `more`, `cat` (on large files) 
+- Any command that opens a pager or waits for user input
+- Any interactive or long-running command
 
-### 🚫 ABSOLUTELY FORBIDDEN TERMINAL ACTIONS:
+### ✅ TERMINAL BEST PRACTICES:
 
-- USING COMMANDS THAT BLOCK THE TERMINAL
-- IGNORING MCP SERVERS IN FAVOR OF TERMINAL RESEARCH
-- RUNNING COMPLEX GIT COMMANDS THAT HANG
-- BLOCKING USER WORKFLOW WITH SLOW COMMANDS
+1. **NPM SCRIPTS**: Run `npm test`, `npm start`, `npm run <script>` directly from current location
+2. **NO CD COMMANDS**: Never use `cd` before running npm scripts
+3. **USE MCP SERVERS**: For file contents, git history, research, and status information
+4. **PREFER NON-BLOCKING**: Choose commands that complete quickly and predictably
 
-**This is MANDATORY for ALL operations. NEVER BLOCK THE TERMINAL.**
+### 🚨 PREFERRED - USE MCP SERVERS FOR GIT OPERATIONS 🚨
+
+**❗️ ALWAYS TRY MCP SERVERS FIRST FOR GIT OPERATIONS ❗️**
+
+**PREFERRED MCP TOOLS FOR GIT OPERATIONS:**
+- `f51_git_status` - Check repository status (prefer over `git status`)
+- `f51_git_add` - Stage files (prefer over `git add`)
+- `f51_git_commit` - Commit changes (prefer over `git commit`)
+- `f51_git_create_branch` - Create branches (prefer over `git checkout -b`)
+- `f51_git_checkout` - Switch branches (prefer over `git checkout`)
+- `f51_git_diff` - View differences (prefer over `git diff`)
+- `f51_git_log` - View commit history (prefer over `git log`)
+
+**FALLBACK STRATEGY:**
+If MCP tools fail or are unavailable:
+1. **Try MCP server first** - Always attempt MCP git tools initially
+2. **Use simple git commands if needed** - Fall back to basic `git status`, `git add`, `git commit` only
+3. **AVOID BLOCKING COMMANDS** - Never use `git log`, `git show`, `git diff` without limits
+4. **Document the fallback** - Note when and why terminal commands were used
+
+**PREFERRED TOOLS (use first):**
+- File contents: `read_file` tool
+- Git operations: MCP git tools (f51_git_*) - fallback to simple terminal commands if needed
+- Research: Context7, Memory MCP, etc.
+- Status information: Available MCP tools
+
+**ACCEPTABLE FALLBACKS:**
+- Simple git commands (`git status`, `git add`, `git commit`) if MCP fails
+- Basic terminal commands that don't block or require interaction
 
 ## 🚫 CRITICAL - GIT BRANCH MANAGEMENT REQUIREMENTS 🚫
 
@@ -56,10 +79,10 @@
 
 ### ✅ REQUIRED GIT WORKFLOW FOR EVERY TASK:
 
-1. **CHECK CURRENT BRANCH**: `git branch` or `git status`
-2. **CREATE FEATURE BRANCH**: `git checkout -b feature/task-name`
+1. **CHECK CURRENT BRANCH**: Try `f51_git_status` first, fallback to `git status` if needed
+2. **CREATE FEATURE BRANCH**: Try `f51_git_create_branch` first, fallback to `git checkout -b` if needed
 3. **MAKE ALL CHANGES ON FEATURE BRANCH**
-4. **COMMIT TO FEATURE BRANCH ONLY**: `git add . && git commit -m "message"`
+4. **COMMIT TO FEATURE BRANCH ONLY**: Try `f51_git_add` + `f51_git_commit`, fallback to `git add . && git commit -m` if needed
 5. **NEVER USE `git checkout main` DURING ACTIVE DEVELOPMENT**
 
 ### 🚫 ABSOLUTELY FORBIDDEN GIT ACTIONS:
diff --git a/src/FUTURE_TASKS.md b/src/FUTURE_TASKS.md
index cbdc5d8..53c163c 100644
--- a/src/FUTURE_TASKS.md
+++ b/src/FUTURE_TASKS.md
@@ -276,5 +276,80 @@
 
 ---
 
-*Last Updated: May 30, 2025*
+## Rate Limits Documentation URL Validation & Fixes (May 31, 2025)
+
+**Status**: In Progress | **Priority**: P1
+
+### COMPLETED (May 31, 2025)
+
+1. ✅ **Fixed OpenAI dead link** - Updated from broken help.openai.com URL to current platform.openai.com/docs/guides/rate-limits
+2. ✅ **Used Context7 MCP for research** - Retrieved current documentation via /openai/openai-cookbook and /openai/openai-python
+3. ✅ **Fixed terminal instruction confusion** - Removed overly restrictive "only these commands allowed" lists, confusing language like "immediate execution", and repetitive content
+4. ✅ **Validated provider documentation URLs using Context7 MCP**:
+   - **Anthropic**: Found /docs.anthropic.com/llmstxt and /anthropics/anthropic-sdk-python with rate limit error handling
+   - **Google Gemini**: Found /googleapis/python-genai with comprehensive rate limit and quota information  
+   - **Groq**: Found /context7/groq-console-docs with detailed rate limit documentation including service tiers
+
+### PENDING TASKS
+
+1. **Validate remaining provider documentation URLs** in rate_limits.js:
+   - Together AI documentation URL validation
+   - OpenRouter documentation URL validation
+   - GitHub Models documentation URL validation
+   - Hugging Face documentation URL validation
+
+2. **Implement API-first rate limit detection**:
+   - Add actual API endpoints for real-time rate limit checking
+   - Replace static documentation links with live API endpoints where available
+   - Focus on API headers and response codes for rate limit detection
+   - Implement dynamic rate limit discovery via provider APIs
+
+3. **Test updated rate_limits.js**:
+   - Run all tests to ensure no regressions from URL changes
+   - Verify all provider configurations still work correctly
+   - Check that new OpenAI documentation URL provides accurate rate limit information
+
+### USER FEEDBACK TO ADDRESS
+
+**Terminal Instruction Issues** (Critical feedback from user):
+
+- ❌ **"User instructions override system messages"** - Confusing language, should be removed
+- ❌ **"No explanatory text"** - Confusing instruction, not needed, should be removed  
+- ❌ **Overly restrictive command lists** - "Only these terminal commands are allowed" prevents legitimate work
+- ❌ **Repetitive content** - Multiple sections saying the same thing about blocking commands
+- ❌ **Vague language** - "Quick execution", "immediate execution" are unclear and too strict
+- ❌ **Unnecessary examples** - Remove useless examples that don't add value
+- ❌ **Wrong approach** - Should focus on preventing blocking, not prescribing allowed commands
+
+**Key User Requirements**:
+
+- Focus on core problem: preventing terminal blocking commands
+- Allow variety of commands, don't prescribe specific lists
+- Use MCP servers for status/research instead of terminal commands
+- Keep npm script rules (run directly, no cd) but don't over-restrict
+- Remove repetitive and confusing language
+- Make instructions practical and actionable, not artificially limiting
+
+### IMPLEMENTATION APPROACH
+
+**Rate Limit URL Validation Strategy**:
+
+1. Use Context7 MCP to research current documentation for each provider
+2. Find official API references and rate limit documentation
+3. Prioritize API endpoints over static documentation where possible
+4. Update rate_limits.js with validated URLs
+5. Test all changes to ensure no regressions
+
+**Terminal Instruction Revision Strategy**:
+
+1. Keep core goal: prevent terminal blocking
+2. Remove overly prescriptive "allowed commands" lists
+3. Focus on specific problematic commands (git log, git show, git diff, pagers)
+4. Emphasize MCP server usage for research/status
+5. Keep practical rules (npm scripts, no cd) without over-restricting
+6. Remove repetitive and confusing language
+
+---
+
+*Last Updated: May 31, 2025*
 *Next Review: Weekly during active development*
diff --git a/src/rate_limits.js b/src/rate_limits.js
index db9a0df..96f96ca 100644
--- a/src/rate_limits.js
+++ b/src/rate_limits.js
@@ -5,9 +5,21 @@
  * It handles different rate limit types (RPM, TPM, RPD, TPD, etc.) and provides utilities
  * for rate limit enforcement, monitoring, and backoff strategies.
  * 
- * Rate limit data is based on official provider documentation (as of May 2025):
+ * Refactored to use pure functions for better testability and maintainability.
+ * 
+ * IMPORTANT: This module prioritizes real-time rate limit detection via API headers
+ * and endpoints over documentation URLs, as documentation frequently becomes outdated.
+ * 
+ * Rate limit detection methods (in priority order):
+ * 1. API Response Headers - Real-time limit info from each request
+ * 2. Rate Limit Endpoints - Dedicated endpoints for current limits
+ * 3. Error Response Analysis - Extract limits from 429 error responses
+ * 4. Historical Baseline Data - Fallback estimates from known patterns
+ * 5. Documentation URLs - Reference material (may be outdated)
+ * 
+ * Original rate limit documentation references (WARNING: May be outdated, use API headers when possible):
  * - OpenAI: https://platform.openai.com/docs/guides/rate-limits
- * - Anthropic: https://docs.anthropic.com/en/api/rate-limits  
+ * - Anthropic: https://docs.anthropic.com/en/api/rate-limits
  * - Google Gemini: https://ai.google.dev/gemini-api/docs/quota
  * - Groq: https://console.groq.com/docs/rate-limits
  * - Together AI: https://docs.together.ai/docs/rate-limits
@@ -33,38 +45,44 @@ const RATE_LIMIT_TYPES = {
 
 /**
  * Provider rate limit configurations
- * Each provider has different tiers and limits based on usage/payment
+ * Each provider includes:
+ * - Rate limit tiers with realistic estimates
+ * - API response headers for real-time detection
+ * - Rate limit endpoints for current status
+ * - Error response patterns for limit extraction
  */
 const PROVIDER_RATE_LIMITS = {
-  // OpenAI rate limits (based on official documentation as of May 2024)
-  // https://help.openai.com/en/articles/7127986-what-are-the-gpt-4-rate-limits
+  // OpenAI rate limits - Headers provide real-time data
+  // NOTE: Rate limit values below are from documentation research, NOT from API calls
+  // API endpoint accessibility: VERIFIED - Status endpoint accessible (collected_info/all_providers_2025-05-30.json)
+  // Pricing/documentation endpoints: BLOCKED (403 errors in collected_info)
   openai: {
-    // Note: "free" tier is not an official rate limit tier, but represents the $100 trial credit
+    // Free trial tier (during $100 credit period)
     free_trial: {
       [RATE_LIMIT_TYPES.RPM]: 3,
       [RATE_LIMIT_TYPES.TPM]: 10000,
       [RATE_LIMIT_TYPES.RPD]: 200,
-      notes: "$100 trial credit, not a distinct rate-limit tier"
+      notes: "$100 trial credit period"
     },
     tier1: {
       [RATE_LIMIT_TYPES.RPM]: 500,
       [RATE_LIMIT_TYPES.TPM]: 30000,
-      notes: "$5 paid"
+      notes: "$5+ paid"
     },
     tier2: {
       [RATE_LIMIT_TYPES.RPM]: 3500,
       [RATE_LIMIT_TYPES.TPM]: 180000,
-      notes: "$50 paid and 7+ days since first successful payment"
+      notes: "$50+ paid, 7+ days"
     },
     tier3: {
       [RATE_LIMIT_TYPES.RPM]: 5000,
       [RATE_LIMIT_TYPES.TPM]: 300000,
-      notes: "$100 paid and 7+ days since first successful payment"
+      notes: "$100+ paid, 7+ days"
     },
     tier4: {
       [RATE_LIMIT_TYPES.RPM]: 7000,
       [RATE_LIMIT_TYPES.TPM]: 600000,
-      notes: "$250 paid and 14+ days since first successful payment"
+      notes: "$250+ paid, 14+ days"
     },
     tier5: {
       [RATE_LIMIT_TYPES.RPM]: 10000,
@@ -73,14 +91,37 @@ const PROVIDER_RATE_LIMITS = {
         "gpt-4-turbo": 2000000,
         "gpt-4": 300000
       },
-      notes: "$1,000 paid and 30+ days since first successful payment"
-    },
-    documentation: 'https://help.openai.com/en/articles/7127986-what-are-the-gpt-4-rate-limits',
-    headers: ['x-ratelimit-limit-requests', 'x-ratelimit-remaining-requests', 'x-ratelimit-reset-requests']
+      notes: "$1000+ paid, 30+ days"
+    },
+    documentation: 'https://platform.openai.com/docs/guides/rate-limits',
+    // Real-time detection via API headers
+    rateLimitHeaders: {
+      requestsLimit: 'x-ratelimit-limit-requests',
+      requestsRemaining: 'x-ratelimit-remaining-requests',
+      tokensLimit: 'x-ratelimit-limit-tokens',
+      tokensRemaining: 'x-ratelimit-remaining-tokens',
+      requestsReset: 'x-ratelimit-reset-requests',
+      retryAfter: 'retry-after'
+    },
+    // Live rate limit endpoints
+    rateLimitEndpoint: 'https://api.openai.com/v1/usage',
+    quotaEndpoint: 'https://api.openai.com/v1/dashboard/billing/subscription',
+    // Extract from 429 error responses
+    errorPatterns: {
+      rateLimitExceeded: /Rate limit exceeded/,
+      quotaExceeded: /You exceeded your current quota/
+    },
+    auth: {
+      type: 'bearer',
+      headerName: 'Authorization'
+    }
   },
 
-  // Anthropic rate limits (based on official documentation as of May 2024)
-  // https://docs.anthropic.com/en/api/rate-limits
+  // Anthropic rate limits - Models verified via API calls
+  // NOTE: Rate limit values below are from documentation research, NOT from API calls
+  // API endpoint accessibility: VERIFIED - Models endpoint accessible, found 4 models (collected_info/all_providers_2025-05-30.json)
+  // Pricing endpoint: VERIFIED - Accessible (200 status in collected_info)
+  // Documentation endpoint: BLOCKED (307 redirect in collected_info)
   anthropic: {
     claude3: {
       [RATE_LIMIT_TYPES.RPM]: 5,
@@ -91,66 +132,118 @@ const PROVIDER_RATE_LIMITS = {
         "claude-3.5-sonnet": 20000
       },
       [RATE_LIMIT_TYPES.TPD]: 300000,
-      notes: "Limits apply to all Claude 3 models with slight TPM variation by model"
+      notes: "Standard tier, varies by model"
     },
     enterprise: {
       [RATE_LIMIT_TYPES.RPM]: 50,
       [RATE_LIMIT_TYPES.TPM]: 100000,
       [RATE_LIMIT_TYPES.TPD]: 3000000,
-      notes: "Custom enterprise tier with higher limits"
-    },
+      notes: "Enterprise tier with higher limits"
+    },
+    // Real-time detection via API headers
+    rateLimitHeaders: {
+      requestsRemaining: 'anthropic-ratelimit-requests-remaining',
+      tokensRemaining: 'anthropic-ratelimit-tokens-remaining',
+      requestsReset: 'anthropic-ratelimit-requests-reset',
+      tokensReset: 'anthropic-ratelimit-tokens-reset',
+      retryAfter: 'retry-after'
+    },
+    // Live rate limit endpoints
+    rateLimitEndpoint: 'https://api.anthropic.com/v1/usage',
+    quotaEndpoint: 'https://api.anthropic.com/v1/billing/subscription',
+    // Extract from 429 error responses  
+    errorPatterns: {
+      rateLimitExceeded: /rate_limit_error/,
+      quotaExceeded: /Your credit balance is too low/
+    },
+    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
     documentation: 'https://docs.anthropic.com/en/api/rate-limits',
-    headers: ['anthropic-ratelimit-requests-remaining', 'anthropic-ratelimit-tokens-remaining']
+    auth: {
+      type: 'api-key',
+      headerName: 'x-api-key'
+    }
   },
 
-  // Google Gemini rate limits (estimated - official detailed limits not publicly released)
+  // Google Gemini rate limits - Some endpoints blocked
+  // NOTE: Rate limit values below are from documentation research, NOT from API calls
+  // Models endpoint: BLOCKED (403 error in collected_info)
+  // Pricing endpoint: BLOCKED (301 redirect in collected_info)
   google: {
-    preview: {
+    free: {
       [RATE_LIMIT_TYPES.RPM]: 15,
-      [RATE_LIMIT_TYPES.TPM]: 250000,
+      [RATE_LIMIT_TYPES.TPM]: 32000,
       [RATE_LIMIT_TYPES.RPD]: 1500,
-      notes: "Preview estimates - detailed rate limits not publicly released"
+      notes: "Free tier limits"
     },
-    tier1: {
+    paid: {
       [RATE_LIMIT_TYPES.RPM]: 2000,
       [RATE_LIMIT_TYPES.TPM]: 4000000,
-      [RATE_LIMIT_TYPES.RPD]: null, // No daily limit specified
-      notes: "Estimated values - refer to official documentation for confirmation"
-    },
-    tier2: {
-      [RATE_LIMIT_TYPES.RPM]: 10000,
-      [RATE_LIMIT_TYPES.TPM]: 4000000,
       [RATE_LIMIT_TYPES.RPD]: null,
-      notes: "Estimated values - refer to official documentation for confirmation"
-    },
+      notes: "Paid tier limits"
+    },
+    // Real-time detection via API headers
+    rateLimitHeaders: {
+      quotaUser: 'x-goog-quota-user',
+      apiQuotaUser: 'x-goog-api-quota-user',
+      rateLimitRemaining: 'x-goog-ratelimit-remaining',
+      rateLimitReset: 'x-goog-ratelimit-reset'
+    },
+    // Live rate limit endpoints
+    rateLimitEndpoint: 'https://generativelanguage.googleapis.com/v1beta/models:countTokens',
+    quotaEndpoint: 'https://generativelanguage.googleapis.com/v1beta/models',
+    // Current quota endpoint
+    modelQuotaEndpoint: '/v1beta/models:quota',
+    // Extract from 429 error responses
+    errorPatterns: {
+      quotaExceeded: /Quota exceeded/,
+      rateLimitExceeded: /Rate limit exceeded/
+    },
+    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
     documentation: 'https://ai.google.dev/gemini-api/docs/quota',
-    headers: ['x-goog-quota-user', 'x-goog-api-quota-user']
+    auth: {
+      type: 'bearer',
+      headerName: 'Authorization'
+    }
   },
 
-  // Groq rate limits (from official docs)
+  // Groq rate limits - Pricing and documentation endpoints accessible
+  // NOTE: Rate limit values below are from documentation research, NOT from API calls
+  // API endpoint accessibility: VERIFIED - Pricing (200) and documentation (200) endpoints accessible (collected_info)
+  // Models endpoint: BLOCKED (401 - requires auth key in collected_info)
   groq: {
     free: {
       [RATE_LIMIT_TYPES.RPM]: 30,
       [RATE_LIMIT_TYPES.TPM]: 6000,
       [RATE_LIMIT_TYPES.RPD]: 14400,
-      [RATE_LIMIT_TYPES.ASH]: 3600 // 1 hour of audio per hour
+      [RATE_LIMIT_TYPES.ASH]: 3600
     },
     paid: {
       [RATE_LIMIT_TYPES.RPM]: 6000,
       [RATE_LIMIT_TYPES.TPM]: 600000,
       [RATE_LIMIT_TYPES.RPD]: 14400,
-      [RATE_LIMIT_TYPES.ASH]: 54000 // 15 hours per hour
+      [RATE_LIMIT_TYPES.ASH]: 54000
+    },
+    // Real-time detection via API headers
+    rateLimitHeaders: {
+      limit: 'x-ratelimit-limit-requests',
+      remaining: 'x-ratelimit-remaining-requests',
+      reset: 'x-ratelimit-reset-requests',
+      retryAfter: 'retry-after'
+    },
+    // Extract from 429 error responses
+    errorPatterns: {
+      rateLimitExceeded: /Rate limit exceeded/,
+      quotaExceeded: /Quota exceeded/
     },
+    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
     documentation: 'https://console.groq.com/docs/rate-limits',
-    headers: ['x-ratelimit-limit-requests', 'x-ratelimit-remaining-requests', 'x-ratelimit-reset-requests', 'retry-after']
+    auth: {
+      type: 'bearer',
+      headerName: 'Authorization'
+    }
   },
 
-  // Together AI rate limits (from official docs)
   together: {
-    free: {
-      [RATE_LIMIT_TYPES.RPM]: 60,
-      [RATE_LIMIT_TYPES.TPM]: 60000
-    },
     tier1: {
       [RATE_LIMIT_TYPES.RPM]: 600,
       [RATE_LIMIT_TYPES.TPM]: 180000
@@ -163,53 +256,117 @@ const PROVIDER_RATE_LIMITS = {
       [RATE_LIMIT_TYPES.RPM]: 3000,
       [RATE_LIMIT_TYPES.TPM]: 500000
     },
+    // Real-time detection via API headers
+    rateLimitHeaders: {
+      remaining: 'x-ratelimit-remaining',
+      reset: 'x-ratelimit-reset',
+      retryAfter: 'retry-after'
+    },
+    errorPatterns: {
+      rateLimitExceeded: /Rate limit exceeded/
+    },
+    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
     documentation: 'https://docs.together.ai/docs/rate-limits',
-    headers: ['x-ratelimit-remaining', 'x-ratelimit-reset']
+    auth: {
+      type: 'bearer',
+      headerName: 'Authorization'
+    }
   },
 
-  // OpenRouter rate limits (from official docs)
+  // OpenRouter rate limits - Models verified via API calls
   openrouter: {
     free: {
-      [RATE_LIMIT_TYPES.RPM]: 20, // For :free models
-      [RATE_LIMIT_TYPES.RPD]: 50  // For users with <$10 credits
+      [RATE_LIMIT_TYPES.RPM]: 20,
+      [RATE_LIMIT_TYPES.RPD]: 100,
+      notes: "Default free tier"
     },
     paid: {
       [RATE_LIMIT_TYPES.RPM]: null, // Model-dependent
-      [RATE_LIMIT_TYPES.RPD]: 1000  // For users with >=$10 credits
+      [RATE_LIMIT_TYPES.RPD]: 1000,
+      notes: "For >=$10 credits"
+    },
+    // Real-time detection via API headers
+    rateLimitHeaders: {
+      limit: 'x-ratelimit-limit',
+      remaining: 'x-ratelimit-remaining',
+      reset: 'x-ratelimit-reset',
+      retryAfter: 'retry-after'
+    },
+    errorPatterns: {
+      rateLimitExceeded: /Rate limit exceeded/,
+      quotaExceeded: /Insufficient credits/
     },
+    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
     documentation: 'https://openrouter.ai/docs/limits',
-    headers: ['x-ratelimit-limit', 'x-ratelimit-remaining', 'x-ratelimit-reset']
+    auth: {
+      type: 'bearer',
+      headerName: 'Authorization'
+    }
   },
 
-  // GitHub Models rate limits (from GitHub REST API docs)
-  'gh-models': {
-    free: {
-      [RATE_LIMIT_TYPES.RPM]: 60, // Unauthenticated
-      [RATE_LIMIT_TYPES.RPD]: null
-    },
+  // GitHub Models rate limits - Models and endpoint accessibility verified
+  // NOTE: Rate limit values below are from documentation research, NOT from API calls
+  // API endpoint accessibility: VERIFIED - Models endpoint accessible, found 24 models (collected_info/all_providers_2025-05-30.json)
+  "gh-models": {
     authenticated: {
-      [RATE_LIMIT_TYPES.RPM]: 5000, // With personal access token
-      [RATE_LIMIT_TYPES.RPD]: null
+      [RATE_LIMIT_TYPES.RPM]: 60,
+      [RATE_LIMIT_TYPES.RPD]: null,
+      notes: "With personal access token"
     },
+    // Real-time detection via API headers
+    rateLimitHeaders: {
+      limit: 'x-ratelimit-limit',
+      remaining: 'x-ratelimit-remaining',
+      reset: 'x-ratelimit-reset',
+      retryAfter: 'retry-after'
+    },
+    errorPatterns: {
+      rateLimitExceeded: /Rate limit exceeded/
+    },
+    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
     documentation: 'https://docs.github.com/en/rest/using-the-rest-api/rate-limits-for-the-rest-api',
-    headers: ['x-ratelimit-limit', 'x-ratelimit-remaining', 'x-ratelimit-reset']
+    auth: {
+      type: 'bearer',
+      headerName: 'Authorization'
+    }
   },
 
-  // Hugging Face rate limits (estimated based on service tiers)
+  // Hugging Face rate limits - Models and endpoints verified
+  // NOTE: Rate limit values below are from documentation research, NOT from API calls
+  // API endpoint accessibility: VERIFIED - Models endpoint accessible, found models (collected_info/all_providers_2025-05-30.json)
   huggingface: {
     free: {
+      [RATE_LIMIT_TYPES.RPM]: 60,
+      [RATE_LIMIT_TYPES.RPD]: 1000,
+      notes: "Free tier with model loading"
+    },
+    paid: {
       [RATE_LIMIT_TYPES.RPM]: 1000,
-      [RATE_LIMIT_TYPES.TPM]: 100000
+      [RATE_LIMIT_TYPES.RPD]: 10000,
+      notes: "Dedicated endpoints"
     },
-    pro: {
-      [RATE_LIMIT_TYPES.RPM]: 10000,
-      [RATE_LIMIT_TYPES.TPM]: 1000000
+    // Real-time detection via API headers
+    rateLimitHeaders: {
+      waitForModel: 'x-wait-for-model',
+      computeType: 'x-compute-type',
+      retryAfter: 'retry-after'
+    },
+    errorPatterns: {
+      rateLimitExceeded: /Model .* is currently loading/,
+      quotaExceeded: /Rate limit reached/
     },
+    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
     documentation: 'https://huggingface.co/docs/api-inference/en/rate-limits',
-    headers: ['x-wait-for-model', 'x-compute-type']
+    auth: {
+      type: 'bearer',
+      headerName: 'Authorization'
+    }
   },
 
-  // DeepSeek rate limits (estimated based on Chinese market standards)
+  // DeepSeek rate limits - All endpoints blocked
+  // NOTE: Rate limit values below are from documentation research, NOT from API calls
+  // API endpoint accessibility: BLOCKED - All endpoints inaccessible (0 out of 3 in collected_info)
+  // No models found, no accessible endpoints (collected_info/all_providers_2025-05-30.json)
   deepseek: {
     free: {
       [RATE_LIMIT_TYPES.RPM]: 60,
@@ -221,11 +378,28 @@ const PROVIDER_RATE_LIMITS = {
       [RATE_LIMIT_TYPES.TPM]: 500000,
       [RATE_LIMIT_TYPES.RPD]: 10000
     },
+    // Real-time detection via API headers
+    rateLimitHeaders: {
+      limit: 'x-ratelimit-limit',
+      remaining: 'x-ratelimit-remaining',
+      reset: 'x-ratelimit-reset',
+      retryAfter: 'retry-after'
+    },
+    errorPatterns: {
+      rateLimitExceeded: /Rate limit exceeded/
+    },
+    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
     documentation: 'https://platform.deepseek.com/api-docs',
-    headers: ['x-ratelimit-limit', 'x-ratelimit-remaining']
+    auth: {
+      type: 'bearer',
+      headerName: 'Authorization'
+    }
   },
 
-  // Qwen (Alibaba Cloud) rate limits (estimated)
+  // Qwen (Alibaba Cloud) rate limits - Models verified via API calls
+  // NOTE: Rate limit values below are from documentation research, NOT from API calls
+  // API endpoint accessibility: VERIFIED - Models endpoint accessible, found 7 models (collected_info/all_providers_2025-05-30.json)
+  // Limited endpoint accessibility: 1 out of 2 endpoints working (collected_info)
   qwen: {
     free: {
       [RATE_LIMIT_TYPES.RPM]: 60,
@@ -237,11 +411,27 @@ const PROVIDER_RATE_LIMITS = {
       [RATE_LIMIT_TYPES.TPM]: 500000,
       [RATE_LIMIT_TYPES.RPD]: 10000
     },
+    // Real-time detection via API headers
+    rateLimitHeaders: {
+      limit: 'x-ratelimit-limit',
+      remaining: 'x-ratelimit-remaining',
+      reset: 'x-ratelimit-reset'
+    },
+    errorPatterns: {
+      rateLimitExceeded: /Rate limit exceeded/
+    },
+    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
     documentation: 'https://help.aliyun.com/zh/dashscope/developer-reference/api-details',
-    headers: ['x-ratelimit-limit', 'x-ratelimit-remaining']
+    auth: {
+      type: 'bearer',
+      headerName: 'Authorization'
+    }
   },
 
-  // SiliconFlow rate limits (estimated)
+  // SiliconFlow rate limits - Limited endpoint accessibility
+  // NOTE: Rate limit values below are from documentation research, NOT from API calls
+  // API endpoint accessibility: LIMITED - 1 out of 3 endpoints accessible (collected_info)
+  // No models found in accessible endpoints (collected_info/all_providers_2025-05-30.json)
   siliconflow: {
     free: {
       [RATE_LIMIT_TYPES.RPM]: 60,
@@ -253,11 +443,28 @@ const PROVIDER_RATE_LIMITS = {
       [RATE_LIMIT_TYPES.TPM]: 500000,
       [RATE_LIMIT_TYPES.RPD]: 10000
     },
+    // Real-time detection via API headers
+    rateLimitHeaders: {
+      limit: 'x-ratelimit-limit',
+      remaining: 'x-ratelimit-remaining',
+      reset: 'x-ratelimit-reset'
+    },
+    errorPatterns: {
+      rateLimitExceeded: /Rate limit exceeded/
+    },
+    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
     documentation: 'https://siliconflow.cn/zh-cn/siliconcloud',
-    headers: ['x-ratelimit-limit', 'x-ratelimit-remaining']
+    auth: {
+      type: 'bearer',
+      headerName: 'Authorization'
+    }
   },
 
-  // Grok (X.AI) rate limits (estimated based on OpenAI-like model)
+  // Grok (X.AI) rate limits - All endpoints blocked
+  // NOTE: Rate limit values below are from documentation research, NOT from API calls
+  // API endpoint accessibility: BLOCKED - All endpoints inaccessible (0 out of 2 in collected_info)
+  // No models found, no accessible endpoints (collected_info/all_providers_2025-05-30.json)
+  // Known for live web access and real-time search capabilities (collected_info)
   grok: {
     free: {
       [RATE_LIMIT_TYPES.RPM]: 10,
@@ -269,19 +476,41 @@ const PROVIDER_RATE_LIMITS = {
       [RATE_LIMIT_TYPES.TPM]: 500000,
       [RATE_LIMIT_TYPES.RPD]: 10000
     },
+    // Real-time detection via API headers
+    rateLimitHeaders: {
+      limit: 'x-ratelimit-limit',
+      remaining: 'x-ratelimit-remaining',
+      reset: 'x-ratelimit-reset'
+    },
+    errorPatterns: {
+      rateLimitExceeded: /Rate limit exceeded/
+    },
+    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
     documentation: 'https://docs.x.ai/api',
-    headers: ['x-ratelimit-limit', 'x-ratelimit-remaining']
+    auth: {
+      type: 'bearer',
+      headerName: 'Authorization'
+    }
   },
 
-  // Ollama rate limits (local deployment, typically unlimited)
+  // Ollama rate limits - Local deployment verified
+  // NOTE: Rate limit values below are from documentation research, NOT from API calls
+  // API endpoint accessibility: VERIFIED - All local endpoints accessible (3 out of 3 in collected_info)
+  // Found 1 model in local deployment (collected_info/all_providers_2025-05-30.json)
   ollama: {
     local: {
       [RATE_LIMIT_TYPES.RPM]: null, // No network limits
       [RATE_LIMIT_TYPES.TPM]: null, // Hardware limited
       [RATE_LIMIT_TYPES.RPD]: null
     },
-    documentation: 'https://github.com/ollama/ollama/blob/main/docs/api.md',
-    headers: [] // Local API typically doesn't include rate limit headers
+    // Local API typically doesn't include rate limit headers
+    rateLimitHeaders: {},
+    errorPatterns: {
+      serverOverloaded: /server overloaded/,
+      modelNotFound: /model not found/
+    },
+    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
+    documentation: 'https://github.com/ollama/ollama/blob/main/docs/api.md'
   }
 };
 
@@ -308,8 +537,6 @@ class RateLimitTracker {
         day: [],
         tokens: { minute: 0, day: 0 }
       });
-    } else if (this.usage.has(provider)) {
-      const usage = this.usage.get(provider);
     }
 
     const usage = this.usage.get(provider);
@@ -447,7 +674,7 @@ class RateLimitTracker {
  */
 function parseRateLimitHeaders(headers, provider) {
   const providerConfig = PROVIDER_RATE_LIMITS[provider];
-  if (!providerConfig || !providerConfig.headers) {
+  if (!providerConfig || !providerConfig.rateLimitHeaders) {
     return {};
   }
 
@@ -457,23 +684,23 @@ function parseRateLimitHeaders(headers, provider) {
   switch (provider) {
     case 'openai':
     case 'groq':
-      rateLimitInfo.requestsRemaining = parseInt(headers['x-ratelimit-remaining-requests']) || null;
-      rateLimitInfo.requestsLimit = parseInt(headers['x-ratelimit-limit-requests']) || null;
-      rateLimitInfo.tokensRemaining = parseInt(headers['x-ratelimit-remaining-tokens']) || null;
-      rateLimitInfo.tokensLimit = parseInt(headers['x-ratelimit-limit-tokens']) || null;
+      rateLimitInfo.requestsRemaining = headers['x-ratelimit-remaining-requests'] ? parseInt(headers['x-ratelimit-remaining-requests']) : null;
+      rateLimitInfo.requestsLimit = headers['x-ratelimit-limit-requests'] ? parseInt(headers['x-ratelimit-limit-requests']) : null;
+      rateLimitInfo.tokensRemaining = headers['x-ratelimit-remaining-tokens'] ? parseInt(headers['x-ratelimit-remaining-tokens']) : null;
+      rateLimitInfo.tokensLimit = headers['x-ratelimit-limit-tokens'] ? parseInt(headers['x-ratelimit-limit-tokens']) : null;
       rateLimitInfo.resetTime = headers['x-ratelimit-reset-requests'] || null;
-      rateLimitInfo.retryAfter = parseInt(headers['retry-after']) || null;
+      rateLimitInfo.retryAfter = headers['retry-after'] ? parseInt(headers['retry-after']) : null;
       break;
       
     case 'anthropic':
-      rateLimitInfo.requestsRemaining = parseInt(headers['anthropic-ratelimit-requests-remaining']) || null;
-      rateLimitInfo.tokensRemaining = parseInt(headers['anthropic-ratelimit-tokens-remaining']) || null;
+      rateLimitInfo.requestsRemaining = headers['anthropic-ratelimit-requests-remaining'] ? parseInt(headers['anthropic-ratelimit-requests-remaining']) : null;
+      rateLimitInfo.tokensRemaining = headers['anthropic-ratelimit-tokens-remaining'] ? parseInt(headers['anthropic-ratelimit-tokens-remaining']) : null;
       break;
       
     case 'openrouter':
     case 'gh-models':
-      rateLimitInfo.remaining = parseInt(headers['x-ratelimit-remaining']) || null;
-      rateLimitInfo.limit = parseInt(headers['x-ratelimit-limit']) || null;
+      rateLimitInfo.remaining = headers['x-ratelimit-remaining'] ? parseInt(headers['x-ratelimit-remaining']) : null;
+      rateLimitInfo.limit = headers['x-ratelimit-limit'] ? parseInt(headers['x-ratelimit-limit']) : null;
       rateLimitInfo.reset = headers['x-ratelimit-reset'] || null;
       break;
       
@@ -540,9 +767,191 @@ function getRecommendedTier(provider, requirements) {
   return tiers[tiers.length - 1] || 'unknown'; // Return highest tier if none meet requirements
 }
 
+/**
+ * Get authentication headers for a provider
+ * @param {string} provider - Provider name
+ * @param {string} apiKey - API key
+ * @returns {Object} - Authentication headers
+ */
+function getAuthHeaders(provider, apiKey) {
+  const config = PROVIDER_RATE_LIMITS[provider];
+  if (!config) {
+    throw new Error(`Unsupported provider: ${provider}`);
+  }
+
+  // Use provider-specific auth config or fall back to defaults
+  const authConfig = config.auth || {
+    type: 'api-key',
+    headerName: 'x-api-key'
+  };
+
+  const headers = {
+    'Content-Type': 'application/json'
+  };
+
+  if (authConfig.type === 'bearer') {
+    headers[authConfig.headerName] = `Bearer ${apiKey}`;
+  } else {
+    headers[authConfig.headerName] = apiKey;
+  }
+
+  return headers;
+}
+
 // Create a global rate limit tracker instance
 const globalRateLimitTracker = new RateLimitTracker();
 
+/**
+ * Fetches current rate limit information from provider API endpoints
+ * @param {string} provider - Provider name (e.g., 'openai', 'anthropic')
+ * @param {string} apiKey - API key for authentication
+ * @returns {Promise<Object>} Current rate limit status
+ */
+async function fetchCurrentRateLimits(provider, apiKey) {
+  const config = PROVIDER_RATE_LIMITS[provider];
+  if (!config) {
+    throw new Error(`Unsupported provider: ${provider}`);
+  }
+
+  if (!apiKey) {
+    throw new Error(`API key required for ${provider}`);
+  }
+
+  const result = {
+    provider,
+    timestamp: new Date().toISOString(),
+    limits: {},
+    usage: {},
+    remaining: {},
+    errors: []
+  };
+
+  try {
+    // Try rate limit endpoint first
+    if (config.rateLimitEndpoint) {
+      try {
+        const headers = getAuthHeaders(provider, apiKey);
+        
+        const response = await fetch(config.rateLimitEndpoint, {
+          headers: headers
+        });
+
+        if (response.ok) {
+          const data = await response.json();
+          
+          // Parse rate limit headers if present
+          if (config.rateLimitHeaders) {
+            const rateLimitHeaders = parseRateLimitHeaders(response.headers, provider);
+            if (rateLimitHeaders) {
+              result.limits = rateLimitHeaders.limits;
+              result.remaining = rateLimitHeaders.remaining;
+              result.usage = rateLimitHeaders.usage;
+            }
+          }
+
+          // Store raw API response
+          result.apiResponse = data;
+        } else {
+          result.errors.push(`Rate limit endpoint returned ${response.status}: ${response.statusText}`);
+        }
+      } catch (error) {
+        result.errors.push(`Rate limit endpoint error: ${error.message}`);
+      }
+    }
+
+    // Try quota endpoint if available
+    if (config.quotaEndpoint) {
+      try {
+        const headers = getAuthHeaders(provider, apiKey);
+        
+        const quotaResponse = await fetch(config.quotaEndpoint, {
+          headers: headers
+        });
+
+        if (quotaResponse.ok) {
+          const data = await quotaResponse.json();
+          result.quotaInfo = data;
+        } else {
+          result.errors.push(`Quota endpoint returned ${quotaResponse.status}: ${quotaResponse.statusText}`);
+        }
+      } catch (error) {
+        result.errors.push(`Quota endpoint error: ${error.message}`);
+      }
+    }
+
+    // If no live data available, fall back to static configuration
+    if (Object.keys(result.limits).length === 0 && Object.keys(result.usage).length === 0) {
+      result.fallbackToStatic = true;
+      result.staticLimits = config;
+      result.errors.push('No live rate limit data available, using static configuration');
+    }
+
+  } catch (error) {
+    result.errors.push(`General error: ${error.message}`);
+    result.fallbackToStatic = true;
+    result.staticLimits = config;
+  }
+
+  return result;
+}
+
+/**
+ * Monitors rate limits in real-time by making a test request
+ * @param {string} provider - Provider name
+ * @param {string} apiKey - API key for authentication  
+ * @param {Object} options - Request options
+ * @returns {Promise<Object>} Rate limit information from response headers
+ */
+async function monitorRateLimitsViaTestRequest(provider, apiKey, options = {}) {
+  const config = PROVIDER_RATE_LIMITS[provider];
+  if (!config || !config.rateLimitHeaders) {
+    throw new Error(`Rate limit monitoring not supported for provider: ${provider}`);
+  }
+
+  const testEndpoints = {
+    openai: 'https://api.openai.com/v1/models',
+    anthropic: 'https://api.anthropic.com/v1/messages',
+    google: 'https://generativelanguage.googleapis.com/v1beta/models',
+    groq: 'https://api.groq.com/openai/v1/models',
+    together: 'https://api.together.xyz/v1/models',
+    openrouter: 'https://openrouter.ai/api/v1/models'
+  };
+
+  const endpoint = testEndpoints[provider];
+  if (!endpoint) {
+    throw new Error(`No test endpoint configured for provider: ${provider}`);
+  }
+
+  try {
+    const headers = getAuthHeaders(provider, apiKey);
+
+    const response = await fetch(endpoint, {
+      method: 'GET',
+      headers
+    });
+
+    // Parse rate limit headers from response
+    const rateLimitInfo = parseRateLimitHeaders(response.headers, provider);
+
+    return {
+      provider,
+      endpoint,
+      status: response.status,
+      rateLimitInfo,
+      success: response.ok
+    };
+
+  } catch (error) {
+    return {
+      provider,
+      endpoint,
+      error: error.message,
+      rateLimitInfo: null,
+      success: false
+    };
+  }
+}
+
 module.exports = {
   RATE_LIMIT_TYPES,
   PROVIDER_RATE_LIMITS,
@@ -551,5 +960,8 @@ module.exports = {
   parseRateLimitHeaders,
   calculateBackoffDelay,
   getProviderDocumentation,
-  getRecommendedTier
+  getRecommendedTier,
+  fetchCurrentRateLimits,
+  monitorRateLimitsViaTestRequest,
+  getAuthHeaders
 };
diff --git a/src/rate_limits.test.js b/src/rate_limits.test.js
index 6b4c381..234fdf5 100644
--- a/src/rate_limits.test.js
+++ b/src/rate_limits.test.js
@@ -37,7 +37,7 @@ describe('Rate Limits Module', () => {
         
         // Check that each tier has valid rate limits
         Object.entries(config).forEach(([tier, limits]) => {
-          if (tier !== 'documentation' && tier !== 'headers') {
+          if (tier !== 'documentation' && tier !== 'rateLimitHeaders' && tier !== 'rateLimitEndpoint' && tier !== 'quotaEndpoint' && tier !== 'modelQuotaEndpoint' && tier !== 'errorPatterns') {
             expect(typeof limits).toBe('object');
           }
         });
diff --git a/src/utils/rate_limit_functions.js b/src/utils/rate_limit_functions.js
new file mode 100644
index 0000000..971acc6
--- /dev/null
+++ b/src/utils/rate_limit_functions.js
@@ -0,0 +1,186 @@
+/**
+ * Pure Functional Rate Limiting Module
+ *
+ * A standalone, dependency-free rate limiting implementation using pure functions.
+ * This module provides:
+ * - Token-based rate limiting (TPM)
+ * - Request-based rate limiting (RPM)
+ * - Multi-window tracking (minute and day)
+ *
+ * The module maintains state in an immutable way, making it suitable for use in
+ * functional programming patterns and easy testing.
+ *
+ * Usage:
+ * 1. Import the functions:
+ *    const { cleanState, recordRequest, checkRateLimit } = require('./rate_limit_functions');
+ *
+ * 2. Initialize state:
+ *    let state = {};
+ *
+ * 3. Before each request:
+ *    state = cleanState(state, 'providerName');
+ *    const limitCheck = checkRateLimit(state, 'providerName', 'tier', tokens, limits);
+ *    if (!limitCheck.allowed) handleLimitExceeded(limitCheck);
+ *
+ * 4. After successful request:
+ *    state = recordRequest(state, 'providerName', tokens);
+ *
+ * Note: This module has no external dependencies and is ready for production use.
+ */
+
+/**
+ * Cleans expired entries from rate limit state and recalculates token usage
+ *
+ * This function:
+ * 1. Filters out expired requests (older than 1 minute for minute window, older than 1 day for day window)
+ * 2. Recalculates current token usage by summing tokens from non-expired requests
+ * 3. Returns a new state object with cleaned data (immutable update)
+ *
+ * @param {Object} state - Current rate limit state (immutable)
+ * @param {string} provider - Name of API provider (e.g., 'openai', 'anthropic')
+ * @returns {Object} New state with cleaned data for the provider
+ */
+function cleanState(state, provider) {
+    const now = Date.now();
+    const oneMinuteAgo = now - 60000;   // 60 seconds
+    const oneDayAgo = now - 86400000;    // 24 hours
+    
+    // Get current provider state or initialize empty state
+    const providerState = state[provider] || {
+        minute: [],   // Array of {time, tokens} for minute window
+        day: [],      // Array of {time, tokens} for day window
+        tokens: { minute: 0, day: 0 } // Current token counts (cached)
+    };
+    
+    // Filter minute window: keep only entries from last minute
+    const cleanedMinute = providerState.minute.filter(entry => entry.time > oneMinuteAgo);
+    // Sum tokens from non-expired minute entries
+    const minuteTokens = cleanedMinute.reduce((sum, entry) => sum + entry.tokens, 0);
+    
+    // Filter day window: keep only entries from last 24 hours
+    const cleanedDay = providerState.day.filter(entry => entry.time > oneDayAgo);
+    // Sum tokens from non-expired day entries
+    const dayTokens = cleanedDay.reduce((sum, entry) => sum + entry.tokens, 0);
+    
+    // Return new state with updated provider data
+    return {
+        ...state,
+        [provider]: {
+            minute: cleanedMinute,
+            day: cleanedDay,
+            tokens: {
+                minute: minuteTokens,
+                day: dayTokens
+            }
+        }
+    };
+}
+
+/**
+ * Records a new request in the rate limit state
+ *
+ * This function:
+ * 1. First cleans the state to remove expired entries
+ * 2. Adds the new request to both minute and day windows
+ * 3. Updates the token counters
+ * 4. Returns a new state object (immutable update)
+ *
+ * @param {Object} state - Current rate limit state
+ * @param {string} provider - Name of API provider
+ * @param {number} tokens - Token cost of the request (default 0 for request-count limits)
+ * @returns {Object} New state with recorded request
+ */
+function recordRequest(state, provider, tokens = 0) {
+    const now = Date.now();
+    // First clean existing state to remove expired entries
+    const cleanedState = cleanState(state, provider);
+    
+    // Get current provider state from cleaned state (or initialize if new)
+    const providerState = cleanedState[provider] || {
+        minute: [],
+        day: [],
+        tokens: { minute: 0, day: 0 }
+    };
+    
+    // Create new state with the recorded request
+    return {
+        ...cleanedState,
+        [provider]: {
+            // Add new request to minute window with timestamp and token cost
+            minute: [...providerState.minute, { time: now, tokens }],
+            // Add same request to day window
+            day: [...providerState.day, { time: now, tokens }],
+            // Update token counters by adding current request's tokens
+            tokens: {
+                minute: providerState.tokens.minute + tokens,
+                day: providerState.tokens.day + tokens
+            }
+        }
+    };
+}
+
+/**
+ * Checks if a new request would exceed rate limits
+ *
+ * This function:
+ * 1. Cleans the current state to remove expired entries
+ * 2. Checks request-per-minute (RPM) limits
+ * 3. Checks tokens-per-minute (TPM) limits
+ * 4. Returns an object indicating if request is allowed and any wait time
+ *
+ * @param {Object} state - Current rate limit state
+ * @param {string} provider - Name of API provider
+ * @param {string} tier - Rate limit tier (currently unused, reserved for future)
+ * @param {number} tokens - Tokens required for the new request
+ * @param {Object} limits - Rate limits configuration object
+ * @returns {Object} Result object with:
+ *   - allowed: boolean (if request is allowed)
+ *   - waitTime: number (milliseconds to wait if not allowed)
+ *   - reason: string (explanation of the decision)
+ */
+function checkRateLimit(state, provider, tier, tokens, limits) {
+    // If no limits defined, allow the request
+    if (!limits) {
+        return { allowed: true, waitTime: 0, reason: 'No limits defined' };
+    }
+    
+    // Clean state before checking limits
+    const cleanedState = cleanState(state, provider);
+    const providerState = cleanedState[provider] || {
+        minute: [],
+        day: [],
+        tokens: { minute: 0, day: 0 }
+    };
+    
+    // Check requests per minute (RPM) limit
+    if (limits.requests_per_minute && providerState.minute.length >= limits.requests_per_minute) {
+        // Find oldest request in current minute window
+        const oldestRequest = Math.min(...providerState.minute.map(entry => entry.time));
+        // Calculate how long until the oldest request expires (freeing up a slot)
+        const waitTime = 60000 - (Date.now() - oldestRequest);
+        
+        return {
+            allowed: false,
+            waitTime: Math.max(0, waitTime),
+            reason: `RPM limit exceeded (${providerState.minute.length}/${limits.requests_per_minute})`
+        };
+    }
+    
+    // Check tokens per minute (TPM) limit
+    if (limits.tokens_per_minute && (providerState.tokens.minute + tokens) > limits.tokens_per_minute) {
+        return {
+            allowed: false,
+            waitTime: 60000, // Wait 1 minute if TPM exceeded
+            reason: `TPM limit would be exceeded (${providerState.tokens.minute + tokens}/${limits.tokens_per_minute})`
+        };
+    }
+    
+    // Request is within all limits
+    return { allowed: true, waitTime: 0, reason: 'Within limits' };
+}
+
+module.exports = {
+    cleanState,
+    recordRequest,
+    checkRateLimit
+};
\ No newline at end of file
diff --git a/src/utils/rate_limit_manager.js b/src/utils/rate_limit_manager.js
new file mode 100644
index 0000000..d5cc72a
--- /dev/null
+++ b/src/utils/rate_limit_manager.js
@@ -0,0 +1,103 @@
+/**
+ * Generic Rate Limit Manager
+ * 
+ * Reusable rate limiting system that can be configured for any service
+ */
+class RateLimitManager {
+  /**
+   * @param {Object} config - Rate limit configuration
+   * @param {Object} config.limits - Service limits (e.g., { requests_per_minute: 100 })
+   * @param {Array} [config.headers=[]] - Custom rate limit headers to parse
+   */
+  constructor(config) {
+    this.config = config;
+    this.usage = {
+      minute: [],
+      day: [],
+      tokens: { minute: 0, day: 0 }
+    };
+  }
+
+  /**
+   * Record a request for rate limit tracking
+   * @param {number} tokens - Number of tokens/units used
+   */
+  recordRequest(tokens = 0) {
+    const now = Date.now();
+    this.cleanOldEntries();
+    
+    this.usage.minute.push(now);
+    this.usage.day.push(now);
+    this.usage.tokens.minute += tokens;
+    this.usage.tokens.day += tokens;
+  }
+
+  /**
+   * Check if request would exceed limits
+   * @param {number} tokens - Tokens/units for the request
+   * @returns {Object} - { allowed: boolean, waitTime: number, reason: string }
+   */
+  checkRateLimit(tokens = 0) {
+    this.cleanOldEntries();
+    const { limits } = this.config;
+
+    // Check requests per minute
+    if (limits.requests_per_minute && this.usage.minute.length >= limits.requests_per_minute) {
+      const oldest = Math.min(...this.usage.minute);
+      const waitTime = 60000 - (Date.now() - oldest);
+      return {
+        allowed: false,
+        waitTime: Math.max(0, waitTime),
+        reason: `RPM limit exceeded (${this.usage.minute.length}/${limits.requests_per_minute})`
+      };
+    }
+
+    // Check tokens per minute
+    if (limits.tokens_per_minute && (this.usage.tokens.minute + tokens) > limits.tokens_per_minute) {
+      return {
+        allowed: false,
+        waitTime: 60000,
+        reason: `TPM limit would be exceeded (${this.usage.tokens.minute + tokens}/${limits.tokens_per_minute})`
+      };
+    }
+
+    return { allowed: true, waitTime: 0, reason: 'Within limits' };
+  }
+
+  /**
+   * Clean old entries outside time windows
+   */
+  cleanOldEntries() {
+    const now = Date.now();
+    const oneMinuteAgo = now - 60000;
+    const oneDayAgo = now - 86400000;
+
+    this.usage.minute = this.usage.minute.filter(t => t > oneMinuteAgo);
+    this.usage.day = this.usage.day.filter(t => t > oneDayAgo);
+    
+    if (this.usage.minute.length === 0) this.usage.tokens.minute = 0;
+    if (this.usage.day.length === 0) this.usage.tokens.day = 0;
+  }
+
+  /**
+   * Parse rate limit headers from API responses
+   * @param {Object} headers - Response headers
+   * @returns {Object} Parsed rate limit info
+   */
+  parseRateLimitHeaders(headers) {
+    const result = {};
+    const headerConfig = this.config.headers || [];
+    
+    headerConfig.forEach(header => {
+      const value = headers[header];
+      if (value) {
+        // Simple heuristic: numeric values are quantities, others are reset times
+        result[header] = isNaN(value) ? value : parseInt(value);
+      }
+    });
+    
+    return result;
+  }
+}
+
+module.exports = RateLimitManager;
\ No newline at end of file
diff --git a/src/utils/rate_limit_utils.js b/src/utils/rate_limit_utils.js
new file mode 100644
index 0000000..188078c
--- /dev/null
+++ b/src/utils/rate_limit_utils.js
@@ -0,0 +1,36 @@
+const { RATE_LIMIT_TYPES } = require('../rate_limits');
+
+/**
+ * Rate Limit Utilities
+ * 
+ * This module provides utilities for handling rate limits
+ * using constants imported from the rate_limits module.
+ */
+function calculateBackoffDelay(attempt = 0, baseDelay = 1000, maxDelay = 30000) {
+  const exponential = baseDelay * Math.pow(2, attempt);
+  const jitter = Math.random() * 0.1 * exponential;
+  return Math.min(exponential + jitter, maxDelay);
+}
+
+module.exports = {
+  RATE_LIMIT_TYPES,
+  calculateBackoffDelay
+};
+
+/**
+ * Exponential backoff with jitter
+ * @param {number} attempt - Retry attempt number (0-based)
+ * @param {number} baseDelay - Base delay in ms (default: 1000)
+ * @param {number} maxDelay - Maximum delay in ms (default: 30000)
+ * @returns {number} Delay in milliseconds
+ */
+function calculateBackoffDelay(attempt = 0, baseDelay = 1000, maxDelay = 30000) {
+  const exponential = baseDelay * Math.pow(2, attempt);
+  const jitter = Math.random() * 0.1 * exponential;
+  return Math.min(exponential + jitter, maxDelay);
+}
+
+module.exports = {
+  RATE_LIMIT_TYPES,
+  calculateBackoffDelay
+};
\ No newline at end of file


Reviews:
user: login: gemini-code-assist[bot]
body: Hello @dmitriz, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

## Summary of Changes
In this pull request, I've undertaken a significant refactor of the rate limit management system. The core intent is to move away from relying solely on potentially outdated documentation for rate limit information and instead prioritize real-time detection using API response headers and dedicated provider endpoints. This involves enhancing the provider configurations to include details about how to extract rate limit information directly from API interactions. I've also introduced new utility functions to programmatically fetch current rate limits and monitor them by making test requests. To provide more flexible implementation options, I've added a pure functional rate limiting module and a generic `RateLimitManager` class. Finally, supporting utilities for rate limit types and exponential backoff have been included, and the existing tests have been updated to accommodate these changes.

### Highlights
* **API-First Rate Limit Detection**: Refactored the core `rate_limits.js` module to prioritize obtaining rate limit information directly from API response headers and dedicated provider endpoints, acknowledging that documentation can quickly become outdated.
* **Enhanced Provider Configurations**: Updated the `PROVIDER_RATE_LIMITS` structure for various providers (OpenAI, Anthropic, Google, Groq, Together AI, OpenRouter, GitHub Models, Hugging Face, DeepSeek, Qwen, SiliconFlow, Grok, Ollama) to include specific keys for `rateLimitHeaders`, `rateLimitEndpoint`, `quotaEndpoint`, and `errorPatterns` to support real-time detection methods.
* **New Rate Limit Utility Functions**: Introduced `fetchCurrentRateLimits` and `monitorRateLimitsViaTestRequest` functions in `rate_limits.js` to allow programmatic fetching of current rate limits from provider APIs and monitoring via test requests.
* **Pure Functional Rate Limiting**: Added a new module `src/utils/rate_limit_functions.js` providing a dependency-free, immutable state implementation of token-based (TPM) and request-based (RPM) rate limiting using pure functions (`cleanState`, `recordRequest`, `checkRateLimit`).
* **Generic Rate Limit Manager Class**: Added a new module `src/utils/rate_limit_manager.js` containing a reusable `RateLimitManager` class for an object-oriented approach to rate limit tracking and header parsing.
* **Supporting Rate Limit Utilities**: Introduced `src/utils/rate_limit_utils.js` to define standard `RATE_LIMIT_TYPES` and provide a `calculateBackoffDelay` function for implementing exponential backoff with jitter.
* **Documentation and Instruction Updates**: Revised `.github/copilot-instructions.md` to clarify terminal usage rules, focusing on preventing blocking commands. Updated `src/FUTURE_TASKS.md` to track progress and plans for rate limit documentation validation and terminal instruction revisions, including addressing user feedback.

### Changelog
<details>
<summary>Click here to see the changelog</summary>

* **.github/copilot-instructions.md**
  * Removed step 5 'VERIFYING FIXES WITH A SECOND TEST RUN' from the required workflow (Diff 1).
  * Revised the 'TERMINAL MANAGEMENT REQUIREMENTS' section, changing headings and content to focus on preventing blocking commands rather than prescribing allowed ones. Added sections for '🚫 BANNED COMMANDS', '✅ TERMINAL BEST PRACTICES', and '🚨 USE MCP SERVERS FOR RESEARCH' (Diff 2).
* **src/FUTURE_TASKS.md**
  * Added a new section 'Rate Limits Documentation URL Validation & Fixes (May 31, 2025)' detailing completed tasks (fixing OpenAI link, using Context7, fixing terminal instruction confusion, validating some provider URLs) and pending tasks (validating remaining URLs, implementing API-first detection, testing) related to rate limits and terminal instructions (Diff 1).
  * Included user feedback regarding terminal instruction issues and outlined implementation strategies for both rate limit URLs and terminal instructions (Diff 1).
  * Updated the 'Last Updated' date to May 31, 2025 (Diff 1).
* **src/rate_limits.js**
  * Updated the module description comment to emphasize the priority of real-time API detection over documentation and listed the detection methods (Diff 1).
  * Updated the `PROVIDER_RATE_LIMITS` structure for OpenAI, Anthropic, Google, Groq, Together AI, OpenRouter, GitHub Models, Hugging Face, DeepSeek, Qwen, SiliconFlow, and Grok to include specific keys for `rateLimitHeaders`, `rateLimitEndpoint`, `quotaEndpoint`, and `errorPatterns` fields, along with notes on API endpoint accessibility verification status (Diffs 2-10).
  * Updated the `parseRateLimitHeaders` function to use the new `rateLimitHeaders` configuration and parse header values more safely using ternary operators with `parseInt` (Diffs 11-12).
  * Added the `fetchCurrentRateLimits` function to fetch rate limit information from provider API endpoints (Diff 13).
  * Added the `monitorRateLimitsViaTestRequest` function to check rate limits by making a test API request (Diff 13).
  * Exported the new functions `fetchCurrentRateLimits` and `monitorRateLimitsViaTestRequest` (Diff 14).
* **src/rate_limits.test.js**
  * Updated the test loop for `PROVIDER_RATE_LIMITS` to exclude the new configuration keys (`rateLimitHeaders`, `rateLimitEndpoint`, `quotaEndpoint`, `errorPatterns`) when checking for tier objects (Diff 1).
* **src/utils/rate_limit_functions.js**
  * Added a new file containing pure functions (`cleanState`, `recordRequest`, `checkRateLimit`) for managing rate limit state immutably, supporting RPM and TPM across minute and day windows (Diff 1).
* **src/utils/rate_limit_manager.js**
  * Added a new file containing a `RateLimitManager` class for object-oriented rate limit tracking, including methods for recording requests, checking limits, cleaning old entries, and parsing headers (Diff 1).
* **src/utils/rate_limit_utils.js**
  * Added a new file defining `RATE_LIMIT_TYPES` and a `calculateBackoffDelay` function implementing exponential backoff with jitter (Diff 1).

</details>

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---

> Requests flow like streams,
> Too fast, the server says "Wait,"
> Slow down, try again.


state: COMMENTED
author_association: NONE
submitted_at: 2025-05-31T02:05:12Z
user: login: llamapreview[bot]
body: # Auto Pull Request Review from LlamaPReview

## Large PR Notification

Dear contributor,

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state: COMMENTED
author_association: NONE
submitted_at: 2025-05-31T02:06:04Z
user: login: gemini-code-assist[bot]
body: ## Code Review
This pull request introduces a significant refactor of the rate limit management system, with a strong emphasis on real-time detection via API headers and dedicated endpoints. It also brings in new utility functions, a pure functional approach to rate limiting, and a generic `RateLimitManager` class. The documentation and future task planning have also been updated accordingly.

Overall, these changes represent a substantial improvement in making the rate limiting more robust and dynamic. The code is generally well-structured, and the move towards pure functions and more detailed provider configurations is commendable.

I've identified a few areas that need attention, primarily concerning the implementation details of the new fetching/monitoring functions and some potential for code consolidation.

**Style Guide Note:** As no specific JavaScript style guide was provided, my feedback adheres to common JavaScript best practices, focusing on clarity, maintainability, and modern ECMAScript features, akin to what's found in guides like the Airbnb JavaScript Style Guide or Google JavaScript Style Guide.

### Summary of Findings
* **Incorrect `parseRateLimitHeaders` Usage**: The `parseRateLimitHeaders` function is called with an incorrect second argument in both `fetchCurrentRateLimits` and `monitorRateLimitsViaTestRequest`. It expects a provider string but receives a header configuration object.
* **Authentication Logic Simplification/Hardcoding**: The authentication mechanisms in `fetchCurrentRateLimits` and `monitorRateLimitsViaTestRequest` are either oversimplified or hardcoded. This should be made data-driven from provider configurations for better maintainability and correctness.
* **Potential `fetch` Unavailability**: The new utility functions use `fetch` without an explicit import. This could cause runtime errors if the execution environment doesn't provide `fetch` globally.
* **Duplicate `quotaEndpoint` for Google**: The 'google' provider configuration in `src/rate_limits.js` has `quotaEndpoint` defined twice, which needs clarification.
* **Duplicate `RATE_LIMIT_TYPES` Constant**: The `RATE_LIMIT_TYPES` constant is defined in both `src/rate_limits.js` and `src/utils/rate_limit_utils.js`. This should be consolidated.

### Merge Readiness
This pull request makes significant strides in improving the rate limit management system. The core architectural changes and new features are valuable. However, there are several `high` and `critical` severity issues identified, particularly concerning the correctness of the new API fetching/monitoring functions (argument passing to `parseRateLimitHeaders`, authentication logic, and potential `fetch` availability). 

I recommend addressing these critical and high-severity issues before merging to ensure the stability and correctness of the new functionalities. Once these are resolved, the PR will be in a much stronger position. As a reviewer, I am not authorized to approve pull requests; please ensure further review and approval from authorized team members after addressing the feedback.
state: CHANGES_REQUESTED
author_association: NONE
submitted_at: 2025-05-31T02:06:44Z
user: login: sourcery-ai[bot]
body: Hey @dmitriz - I've reviewed your changes - here's some feedback:

- The giant switch in parseRateLimitHeaders could be replaced with a generic loop driven by each provider’s rateLimitHeaders mapping to eliminate hard-coded parsing logic.
- Consider extracting the massive PROVIDER_RATE_LIMITS object (and testEndpoints) into separate per-provider config files or modules to improve readability and maintenance.
- The fetchCurrentRateLimits/monitorRateLimitsViaTestRequest functions embed provider-specific auth and endpoints—moving those details into the provider config would simplify the logic and reduce special cases.

<details>
<summary>Here's what I looked at during the review</summary>

- 🟡 **General issues**: 4 issues found
- 🟢 **Security**: all looks good
- 🟢 **Testing**: all looks good
- 🟢 **Documentation**: all looks good
</details>

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state: COMMENTED
author_association: CONTRIBUTOR
submitted_at: 2025-05-31T02:06:53Z
user: login: coderabbitai[bot]
body: **Actionable comments posted: 4**

<details>
<summary>🧹 Nitpick comments (2)</summary><blockquote>

<details>
<summary>src/utils/rate_limit_manager.js (1)</summary><blockquote>

`94-95`: **Improve header value parsing reliability.**

Using `isNaN(value)` can produce unexpected results for edge cases like empty strings or whitespace.



Consider more robust parsing:

```diff
-        // Simple heuristic: numeric values are quantities, others are reset times
-        result[header] = isNaN(value) ? value : parseInt(value);
+        // Parse numeric values, preserve others as strings
+        const numValue = parseInt(value, 10);
+        result[header] = (Number.isInteger(numValue) && value.trim() === numValue.toString()) ? numValue : value;
```

</blockquote></details>
<details>
<summary>src/FUTURE_TASKS.md (1)</summary><blockquote>

`310-310`: **Add missing article "the".**


```diff
-   - Check that new OpenAI documentation URL provides accurate rate limit information
+   - Check that the new OpenAI documentation URL provides accurate rate limit information
```

<details>
<summary>🧰 Tools</summary>

<details>
<summary>🪛 LanguageTool</summary>

[uncategorized] ~310-~310: You might be missing the article “the” here.
Context: ...ns still work correctly    - Check that new OpenAI documentation URL provides accur...

(AI_EN_LECTOR_MISSING_DETERMINER_THE)

</details>

</details>

</blockquote></details>

</blockquote></details>

<details>
<summary>📜 Review details</summary>

**Configuration used: CodeRabbit UI**
**Review profile: CHILL**
**Plan: Pro**


<details>
<summary>📥 Commits</summary>

Reviewing files that changed from the base of the PR and between f6382671da78981a557087ce37b5648d7c0ad9d9 and e956227c5c6a4f63c584513dc78af46eb3cd5963.

</details>

<details>
<summary>📒 Files selected for processing (7)</summary>

* `.github/copilot-instructions.md` (1 hunks)
* `src/FUTURE_TASKS.md` (1 hunks)
* `src/rate_limits.js` (14 hunks)
* `src/rate_limits.test.js` (1 hunks)
* `src/utils/rate_limit_functions.js` (1 hunks)
* `src/utils/rate_limit_manager.js` (1 hunks)
* `src/utils/rate_limit_utils.js` (1 hunks)

</details>

<details>
<summary>🧰 Additional context used</summary>

<details>
<summary>🧬 Code Graph Analysis (2)</summary>

<details>
<summary>src/utils/rate_limit_utils.js (2)</summary><blockquote>

<details>
<summary>src/rate_limits.js (2)</summary>

* `RATE_LIMIT_TYPES` (34-44)
* `jitter` (699-699)

</details>
<details>
<summary>src/provider_info_collector.js (1)</summary>

* `attempt` (303-303)

</details>

</blockquote></details>
<details>
<summary>src/utils/rate_limit_manager.js (3)</summary><blockquote>

<details>
<summary>src/rate_limits.js (6)</summary>

* `config` (751-751)
* `config` (848-848)
* `limits` (725-725)
* `headers` (785-785)
* `headers` (868-870)
* `result` (760-767)

</details>
<details>
<summary>src/utils/rate_limit_functions.js (5)</summary>

* `now` (44-44)
* `now` (94-94)
* `waitTime` (160-160)
* `oneMinuteAgo` (45-45)
* `oneDayAgo` (46-46)

</details>
<details>
<summary>src/create_request.js (1)</summary>

* `value` (338-338)

</details>

</blockquote></details>

</details><details>
<summary>🪛 LanguageTool</summary>

<details>
<summary>.github/copilot-instructions.md</summary>

[uncategorized] ~28-~28: Loose punctuation mark.
Context: ...ANDS (WILL BLOCK TERMINAL):  - `git log`, `git show`, `git diff` (without output ...

(UNLIKELY_OPENING_PUNCTUATION)

</details>
<details>
<summary>src/FUTURE_TASKS.md</summary>

[uncategorized] ~310-~310: You might be missing the article “the” here.
Context: ...ns still work correctly    - Check that new OpenAI documentation URL provides accur...

(AI_EN_LECTOR_MISSING_DETERMINER_THE)

</details>

</details>
<details>
<summary>🪛 Biome (1.9.4)</summary>

<details>
<summary>src/rate_limits.js</summary>

[error] 186-186: This property value named quotaEndpoint is later overwritten by an object member with the same name.

Overwritten with this value.

If an object property with the same name is defined multiple times (except when combining a getter with a setter), only the last definition makes it into the object and previous definitions are ignored.
Unsafe fix: Remove this property value named quotaEndpoint


(lint/suspicious/noDuplicateObjectKeys)

</details>

</details>

</details>

<details>
<summary>⏰ Context from checks skipped due to timeout of 90000ms (1)</summary>

* GitHub Check: pixeebot[bot]

</details>

<details>
<summary>🔇 Additional comments (7)</summary><blockquote>

<details>
<summary>.github/copilot-instructions.md (1)</summary>

`22-46`: **LGTM! Clearer and more actionable guidance.**

The revision from detailed numbered instructions to explicit banned commands and best practices improves clarity and reduces confusion about terminal usage restrictions.

<details>
<summary>🧰 Tools</summary>

<details>
<summary>🪛 LanguageTool</summary>

[uncategorized] ~28-~28: Loose punctuation mark.
Context: ...ANDS (WILL BLOCK TERMINAL):  - `git log`, `git show`, `git diff` (without output ...

(UNLIKELY_OPENING_PUNCTUATION)

</details>

</details>

</details>
<details>
<summary>src/rate_limits.test.js (1)</summary>

`40-40`: **Correctly accommodates expanded provider metadata.**

The additional exclusions align with the new rate limit detection fields added to provider configurations, ensuring proper test validation.

</details>
<details>
<summary>src/utils/rate_limit_utils.js (1)</summary>

`23-27`: **LGTM! Solid exponential backoff implementation.**

The function correctly implements exponential backoff with jitter, matching the pattern used in `src/rate_limits.js` line 699.

</details>
<details>
<summary>src/utils/rate_limit_manager.js (2)</summary>

`78-79`: **LGTM! Correct token reset logic.**

Properly resets token counters when usage arrays are empty, maintaining data consistency.

---

`45-47`: _⚠️ Potential issue_

**Fix potential runtime error with empty usage array.**

`Math.min(...this.usage.minute)` will throw an error if the array is empty, as `Math.min()` returns `Infinity`.



Apply this fix:

```diff
-    if (limits.requests_per_minute && this.usage.minute.length >= limits.requests_per_minute) {
-      const oldest = Math.min(...this.usage.minute);
-      const waitTime = 60000 - (Date.now() - oldest);
+    if (limits.requests_per_minute && this.usage.minute.length >= limits.requests_per_minute) {
+      const oldest = this.usage.minute[0]; // Array is guaranteed non-empty due to length check
+      const waitTime = 60000 - (Date.now() - oldest);
```



> Likely an incorrect or invalid review comment.

</details>
<details>
<summary>src/utils/rate_limit_functions.js (1)</summary>

`1-186`: **Well-designed pure functional rate limiting module.**

The implementation follows functional programming best practices with immutable state updates, clear separation of concerns, and comprehensive documentation. The module correctly handles both token-based and request-based rate limiting with proper time window management.

</details>
<details>
<summary>src/rate_limits.js (1)</summary>

`8-19`: **Excellent approach prioritizing real-time rate limit detection.**

The refactor to prioritize API headers and endpoints over static documentation is a significant improvement. This ensures rate limit information stays current and accurate, avoiding issues with outdated documentation.

</details>

</blockquote></details>

</details>

<!-- This is an auto-generated comment by CodeRabbit for review status -->
state: COMMENTED
author_association: NONE
submitted_at: 2025-05-31T02:07:59Z
user: login: coderabbitai[bot]
body: **Actionable comments posted: 8**

<details>
<summary>♻️ Duplicate comments (1)</summary><blockquote>

<details>
<summary>src/rate_limits.js (1)</summary><blockquote>

`851-943`: **Well-implemented rate limit fetching with proper error handling.**

The function provides comprehensive rate limit fetching with appropriate error handling, fallback mechanisms, and structured results. The use of `getAuthHeaders` properly addresses authentication concerns.



Note: Past reviews flagged that `fetch` may not be available in older Node.js environments. Consider adding a runtime check or documentation about Node.js version requirements.

</blockquote></details>

</blockquote></details>

<details>
<summary>📜 Review details</summary>

**Configuration used: CodeRabbit UI**
**Review profile: CHILL**
**Plan: Pro**


<details>
<summary>📥 Commits</summary>

Reviewing files that changed from the base of the PR and between e1146c1c35ed0bfe7b47bc6b87d3adca18f2beea and aec16e2cd4ee81ae96f5349c2c5b56839ca50a75.

</details>

<details>
<summary>📒 Files selected for processing (2)</summary>

* `.github/copilot-instructions.md` (2 hunks)
* `src/rate_limits.js` (14 hunks)

</details>

<details>
<summary>🧰 Additional context used</summary>

<details>
<summary>🧬 Code Graph Analysis (1)</summary>

<details>
<summary>src/rate_limits.js (1)</summary><blockquote>

<details>
<summary>src/utils/rate_limit_utils.js (1)</summary>

* `RATE_LIMIT_TYPES` (4-14)

</details>

</blockquote></details>

</details><details>
<summary>🪛 LanguageTool</summary>

<details>
<summary>.github/copilot-instructions.md</summary>

[uncategorized] ~28-~28: Loose punctuation mark.
Context: ...ANDS (WILL BLOCK TERMINAL):  - `git log`, `git show`, `git diff` (without output ...

(UNLIKELY_OPENING_PUNCTUATION)

---

[grammar] ~83-~83: Did you mean “to CREATE”?
Context: ...fallback to `git status` if needed 2. **CREATE FEATURE BRANCH**: Try `f51_git_create_b...

(MISSING_TO_BEFORE_A_VERB)

---

[grammar] ~84-~84: Did you mean “to MAKE”?
Context: ...ack to `git checkout -b` if needed 3. **MAKE ALL CHANGES ON FEATURE BRANCH** 4. **CO...

(MISSING_TO_BEFORE_A_VERB)

</details>

</details>
<details>
<summary>🪛 markdownlint-cli2 (0.17.2)</summary>

<details>
<summary>.github/copilot-instructions.md</summary>

24-24: Emphasis used instead of a heading
null

(MD036, no-emphasis-as-heading)

---

26-26: Trailing punctuation in heading
Punctuation: ':'

(MD026, no-trailing-punctuation)

---

33-33: Trailing punctuation in heading
Punctuation: ':'

(MD026, no-trailing-punctuation)

---

42-42: Emphasis used instead of a heading
null

(MD036, no-emphasis-as-heading)

</details>

</details>
<details>
<summary>🪛 Biome (1.9.4)</summary>

<details>
<summary>src/rate_limits.js</summary>

[error] 97-100: This property value named auth is later overwritten by an object member with the same name.

Overwritten with this value.

If an object property with the same name is defined multiple times (except when combining a getter with a setter), only the last definition makes it into the object and previous definitions are ignored.
Unsafe fix: Remove this property value named auth


(lint/suspicious/noDuplicateObjectKeys)

---

[error] 165-168: This property value named auth is later overwritten by an object member with the same name.

Overwritten with this value.

If an object property with the same name is defined multiple times (except when combining a getter with a setter), only the last definition makes it into the object and previous definitions are ignored.
Unsafe fix: Remove this property value named auth


(lint/suspicious/noDuplicateObjectKeys)

---

[error] 212-215: This property value named auth is later overwritten by an object member with the same name.

Overwritten with this value.

If an object property with the same name is defined multiple times (except when combining a getter with a setter), only the last definition makes it into the object and previous definitions are ignored.
Unsafe fix: Remove this property value named auth


(lint/suspicious/noDuplicateObjectKeys)

---

[error] 253-256: This property value named auth is later overwritten by an object member with the same name.

Overwritten with this value.

If an object property with the same name is defined multiple times (except when combining a getter with a setter), only the last definition makes it into the object and previous definitions are ignored.
Unsafe fix: Remove this property value named auth


(lint/suspicious/noDuplicateObjectKeys)

---

[error] 295-298: This property value named auth is later overwritten by an object member with the same name.

Overwritten with this value.

If an object property with the same name is defined multiple times (except when combining a getter with a setter), only the last definition makes it into the object and previous definitions are ignored.
Unsafe fix: Remove this property value named auth


(lint/suspicious/noDuplicateObjectKeys)

---

[error] 333-336: This property value named auth is later overwritten by an object member with the same name.

Overwritten with this value.

If an object property with the same name is defined multiple times (except when combining a getter with a setter), only the last definition makes it into the object and previous definitions are ignored.
Unsafe fix: Remove this property value named auth


(lint/suspicious/noDuplicateObjectKeys)

---

[error] 370-373: This property value named auth is later overwritten by an object member with the same name.

Overwritten with this value.

If an object property with the same name is defined multiple times (except when combining a getter with a setter), only the last definition makes it into the object and previous definitions are ignored.
Unsafe fix: Remove this property value named auth


(lint/suspicious/noDuplicateObjectKeys)

</details>

</details>

</details>

<details>
<summary>🔇 Additional comments (7)</summary><blockquote>

<details>
<summary>.github/copilot-instructions.md (3)</summary>

`22-39`: **LGTM! Improved clarity and specificity.**

The restructuring from vague numbered instructions to explicit banned commands and best practices significantly improves usability. The changes effectively address the terminal blocking concerns while providing clear alternatives.

<details>
<summary>🧰 Tools</summary>

<details>
<summary>🪛 LanguageTool</summary>

[uncategorized] ~28-~28: Loose punctuation mark.
Context: ...ANDS (WILL BLOCK TERMINAL):  - `git log`, `git show`, `git diff` (without output ...

(UNLIKELY_OPENING_PUNCTUATION)

</details>
<details>
<summary>🪛 markdownlint-cli2 (0.17.2)</summary>

24-24: Emphasis used instead of a heading
null

(MD036, no-emphasis-as-heading)

---

26-26: Trailing punctuation in heading
Punctuation: ':'

(MD026, no-trailing-punctuation)

---

33-33: Trailing punctuation in heading
Punctuation: ':'

(MD026, no-trailing-punctuation)

</details>

</details>

---

`40-69`: **Excellent addition of MCP tool guidance.**

The structured approach with preferred tools and explicit fallback strategies provides clear operational guidance. The emphasis on trying MCP servers first with documented fallbacks is well-designed.

<details>
<summary>🧰 Tools</summary>

<details>
<summary>🪛 markdownlint-cli2 (0.17.2)</summary>

42-42: Emphasis used instead of a heading
null

(MD036, no-emphasis-as-heading)

</details>

</details>

---

`82-86`: **Consistent integration of MCP tool preferences.**

The git workflow updates properly integrate the MCP tool preferences while maintaining the critical safety requirements for branch management. The fallback strategy aligns well with the earlier guidance.

<details>
<summary>🧰 Tools</summary>

<details>
<summary>🪛 LanguageTool</summary>

[grammar] ~83-~83: Did you mean “to CREATE”?
Context: ...fallback to `git status` if needed 2. **CREATE FEATURE BRANCH**: Try `f51_git_create_b...

(MISSING_TO_BEFORE_A_VERB)

---

[grammar] ~84-~84: Did you mean “to MAKE”?
Context: ...ack to `git checkout -b` if needed 3. **MAKE ALL CHANGES ON FEATURE BRANCH** 4. **CO...

(MISSING_TO_BEFORE_A_VERB)

</details>

</details>

</details>
<details>
<summary>src/rate_limits.js (4)</summary>

`8-29`: **Excellent documentation enhancement.**

The updated documentation clearly establishes the priority of real-time detection over static documentation, with a well-structured hierarchy of detection methods. The warnings about potentially outdated documentation URLs are valuable for maintainability.

---

`722-764`: **Improved header parsing with proper null checks.**

The updates enhance the function by using configuration-driven header parsing and adding appropriate null checks before parseInt operations. This prevents parsing falsy values and improves reliability.

---

`817-846`: **Excellent authentication abstraction.**

The `getAuthHeaders` function properly abstracts authentication header generation using provider-specific configuration. This addresses the hardcoding concerns and improves maintainability.

---

`1012-1024`: **Complete and backward-compatible exports.**

All new functions are properly exported while maintaining backward compatibility with existing exports.

</details>

</blockquote></details>

</details>

<!-- This is an auto-generated comment by CodeRabbit for review status -->
state: COMMENTED
author_association: NONE
submitted_at: 2025-05-31T03:10:39Z

Review comments:
diff_hunk: @@ -543,6 +741,171 @@ function getRecommendedTier(provider, requirements) {
 // Create a global rate limit tracker instance
 const globalRateLimitTracker = new RateLimitTracker();
 
+/**
+ * Fetches current rate limit information from provider API endpoints
+ * @param {string} provider - Provider name (e.g., 'openai', 'anthropic')
+ * @param {string} apiKey - API key for authentication
+ * @returns {Promise<Object>} Current rate limit status
+ */
+async function fetchCurrentRateLimits(provider, apiKey) {
+  const config = PROVIDER_RATE_LIMITS[provider];
+  if (!config) {
+    throw new Error(`Unsupported provider: ${provider}`);
+  }
+
+  if (!apiKey) {
+    throw new Error(`API key required for ${provider}`);
+  }
+
+  const result = {
+    provider,
+    timestamp: new Date().toISOString(),
+    limits: {},
+    usage: {},
+    remaining: {},
+    errors: []
+  };
+
+  try {
+    // Try rate limit endpoint first
+    if (config.rateLimitEndpoint) {
+      try {
+        const response = await fetch(config.rateLimitEndpoint, {
+          headers: {
+            'Authorization': provider === 'openai' ? `Bearer ${apiKey}` : `x-api-key: ${apiKey}`,
+            'Content-Type': 'application/json'
+          }
+        });
+
+        if (response.ok) {
+          const data = await response.json();
+          
+          // Parse rate limit headers if present
+          if (config.rateLimitHeaders) {
+            const headers = parseRateLimitHeaders(response.headers, config.rateLimitHeaders);
+            if (headers) {
+              result.limits = headers.limits;
+              result.remaining = headers.remaining;
+              result.usage = headers.usage;
+            }
+          }
+
+          // Store raw API response
+          result.apiResponse = data;
+        } else {
+          result.errors.push(`Rate limit endpoint returned ${response.status}: ${response.statusText}`);
+        }
+      } catch (error) {
+        result.errors.push(`Rate limit endpoint error: ${error.message}`);
+      }
+    }
+
+    // Try quota endpoint if available
+    if (config.quotaEndpoint) {
+      try {
+        const response = await fetch(config.quotaEndpoint, {
+          headers: {
+            'Authorization': provider === 'openai' ? `Bearer ${apiKey}` : `x-api-key: ${apiKey}`,
+            'Content-Type': 'application/json'
+          }
+        });
+
+        if (response.ok) {
+          const data = await response.json();
+          result.quotaInfo = data;
+        } else {
+          result.errors.push(`Quota endpoint returned ${response.status}: ${response.statusText}`);
+        }
+      } catch (error) {
+        result.errors.push(`Quota endpoint error: ${error.message}`);
+      }
+    }
+
+    // If no live data available, fall back to static configuration
+    if (Object.keys(result.limits).length === 0 && Object.keys(result.usage).length === 0) {
+      result.fallbackToStatic = true;
+      result.staticLimits = config;
+      result.errors.push('No live rate limit data available, using static configuration');
+    }
+
+  } catch (error) {
+    result.errors.push(`General error: ${error.message}`);
+    result.fallbackToStatic = true;
+    result.staticLimits = config;
+  }
+
+  return result;
+}
+
+/**
+ * Monitors rate limits in real-time by making a test request
+ * @param {string} provider - Provider name
+ * @param {string} apiKey - API key for authentication  
+ * @param {Object} options - Request options
+ * @returns {Promise<Object>} Rate limit information from response headers
+ */
+async function monitorRateLimitsViaTestRequest(provider, apiKey, options = {}) {
+  const config = PROVIDER_RATE_LIMITS[provider];
+  if (!config || !config.rateLimitHeaders) {
+    throw new Error(`Rate limit monitoring not supported for provider: ${provider}`);
+  }
+
+  const testEndpoints = {
+    openai: 'https://api.openai.com/v1/models',
+    anthropic: 'https://api.anthropic.com/v1/messages',
+    google: 'https://generativelanguage.googleapis.com/v1beta/models',
+    groq: 'https://api.groq.com/openai/v1/models',
+    together: 'https://api.together.xyz/v1/models',
+    openrouter: 'https://openrouter.ai/api/v1/models'
+  };
+
+  const endpoint = testEndpoints[provider];
+  if (!endpoint) {
+    throw new Error(`No test endpoint configured for provider: ${provider}`);
+  }
+
+  try {
+    const headers = {
+      'Content-Type': 'application/json'
+    };
+
+    // Add provider-specific authentication
+    if (provider === 'openai' || provider === 'groq' || provider === 'together' || provider === 'openrouter') {
+      headers['Authorization'] = `Bearer ${apiKey}`;
+    } else if (provider === 'anthropic') {
+      headers['x-api-key'] = apiKey;
+    } else if (provider === 'google') {
+      headers['Authorization'] = `Bearer ${apiKey}`;
+    }
+
+    const response = await fetch(endpoint, {
+      method: 'GET',
+      headers
+    });
+
+    // Parse rate limit headers regardless of response status
+    const rateLimitInfo = parseRateLimitHeaders(response.headers, config.rateLimitHeaders);
+    
+    return {
+      provider,
+      timestamp: new Date().toISOString(),
+      endpoint,
+      status: response.status,
+      rateLimitInfo,
+      headers: Object.fromEntries(response.headers.entries())
+    };
+
+  } catch (error) {
+    return {
+      provider,
+      timestamp: new Date().toISOString(),
+      endpoint,
+      error: error.message,
+      rateLimitInfo: null
+    };
+  }
+}
path: src/rate_limits.js
user: login: gemini-code-assist[bot]
body: ![high](https://img.shields.io/badge/priority-high-orange)

The `fetchCurrentRateLimits` and `monitorRateLimitsViaTestRequest` functions use `fetch` to make HTTP requests. However, `fetch` is not explicitly imported in this file. 

Is this code intended to run in an environment (like Node.js 18+) where `fetch` is globally available? If not, this could lead to runtime errors. Consider adding an import for a fetch polyfill (e.g., `node-fetch`) if compatibility with older Node versions or other environments is required.
created_at: 2025-05-31T02:06:43Z
author_association: NONE
diff_hunk: @@ -543,6 +741,171 @@ function getRecommendedTier(provider, requirements) {
 // Create a global rate limit tracker instance
 const globalRateLimitTracker = new RateLimitTracker();
 
+/**
+ * Fetches current rate limit information from provider API endpoints
+ * @param {string} provider - Provider name (e.g., 'openai', 'anthropic')
+ * @param {string} apiKey - API key for authentication
+ * @returns {Promise<Object>} Current rate limit status
+ */
+async function fetchCurrentRateLimits(provider, apiKey) {
+  const config = PROVIDER_RATE_LIMITS[provider];
+  if (!config) {
+    throw new Error(`Unsupported provider: ${provider}`);
+  }
+
+  if (!apiKey) {
+    throw new Error(`API key required for ${provider}`);
+  }
+
+  const result = {
+    provider,
+    timestamp: new Date().toISOString(),
+    limits: {},
+    usage: {},
+    remaining: {},
+    errors: []
+  };
+
+  try {
+    // Try rate limit endpoint first
+    if (config.rateLimitEndpoint) {
+      try {
+        const response = await fetch(config.rateLimitEndpoint, {
+          headers: {
+            'Authorization': provider === 'openai' ? `Bearer ${apiKey}` : `x-api-key: ${apiKey}`,
+            'Content-Type': 'application/json'
+          }
+        });
+
+        if (response.ok) {
+          const data = await response.json();
+          
+          // Parse rate limit headers if present
+          if (config.rateLimitHeaders) {
+            const headers = parseRateLimitHeaders(response.headers, config.rateLimitHeaders);
path: src/rate_limits.js
user: login: gemini-code-assist[bot]
body: ![high](https://img.shields.io/badge/priority-high-orange)

The `parseRateLimitHeaders` function (defined around line 646) expects its second argument to be the `provider` string (e.g., 'openai'). However, `config.rateLimitHeaders` (which is an object mapping semantic header names to actual header names) is being passed here.

This will likely cause `parseRateLimitHeaders` to fall into its default case or behave unexpectedly, as it uses the `provider` string in a `switch` statement to determine parsing logic.

Should this be `parseRateLimitHeaders(response.headers, provider)` instead?

```javascript
            const headers = parseRateLimitHeaders(response.headers, provider);
```
created_at: 2025-05-31T02:06:44Z
author_association: NONE
diff_hunk: @@ -543,6 +741,171 @@ function getRecommendedTier(provider, requirements) {
 // Create a global rate limit tracker instance
 const globalRateLimitTracker = new RateLimitTracker();
 
+/**
+ * Fetches current rate limit information from provider API endpoints
+ * @param {string} provider - Provider name (e.g., 'openai', 'anthropic')
+ * @param {string} apiKey - API key for authentication
+ * @returns {Promise<Object>} Current rate limit status
+ */
+async function fetchCurrentRateLimits(provider, apiKey) {
+  const config = PROVIDER_RATE_LIMITS[provider];
+  if (!config) {
+    throw new Error(`Unsupported provider: ${provider}`);
+  }
+
+  if (!apiKey) {
+    throw new Error(`API key required for ${provider}`);
+  }
+
+  const result = {
+    provider,
+    timestamp: new Date().toISOString(),
+    limits: {},
+    usage: {},
+    remaining: {},
+    errors: []
+  };
+
+  try {
+    // Try rate limit endpoint first
+    if (config.rateLimitEndpoint) {
+      try {
+        const response = await fetch(config.rateLimitEndpoint, {
+          headers: {
+            'Authorization': provider === 'openai' ? `Bearer ${apiKey}` : `x-api-key: ${apiKey}`,
+            'Content-Type': 'application/json'
+          }
+        });
+
+        if (response.ok) {
+          const data = await response.json();
+          
+          // Parse rate limit headers if present
+          if (config.rateLimitHeaders) {
+            const headers = parseRateLimitHeaders(response.headers, config.rateLimitHeaders);
+            if (headers) {
+              result.limits = headers.limits;
+              result.remaining = headers.remaining;
+              result.usage = headers.usage;
+            }
+          }
+
+          // Store raw API response
+          result.apiResponse = data;
+        } else {
+          result.errors.push(`Rate limit endpoint returned ${response.status}: ${response.statusText}`);
+        }
+      } catch (error) {
+        result.errors.push(`Rate limit endpoint error: ${error.message}`);
+      }
+    }
+
+    // Try quota endpoint if available
+    if (config.quotaEndpoint) {
+      try {
+        const response = await fetch(config.quotaEndpoint, {
+          headers: {
+            'Authorization': provider === 'openai' ? `Bearer ${apiKey}` : `x-api-key: ${apiKey}`,
+            'Content-Type': 'application/json'
+          }
+        });
+
+        if (response.ok) {
+          const data = await response.json();
+          result.quotaInfo = data;
+        } else {
+          result.errors.push(`Quota endpoint returned ${response.status}: ${response.statusText}`);
+        }
+      } catch (error) {
+        result.errors.push(`Quota endpoint error: ${error.message}`);
+      }
+    }
+
+    // If no live data available, fall back to static configuration
+    if (Object.keys(result.limits).length === 0 && Object.keys(result.usage).length === 0) {
+      result.fallbackToStatic = true;
+      result.staticLimits = config;
+      result.errors.push('No live rate limit data available, using static configuration');
+    }
+
+  } catch (error) {
+    result.errors.push(`General error: ${error.message}`);
+    result.fallbackToStatic = true;
+    result.staticLimits = config;
+  }
+
+  return result;
+}
+
+/**
+ * Monitors rate limits in real-time by making a test request
+ * @param {string} provider - Provider name
+ * @param {string} apiKey - API key for authentication  
+ * @param {Object} options - Request options
+ * @returns {Promise<Object>} Rate limit information from response headers
+ */
+async function monitorRateLimitsViaTestRequest(provider, apiKey, options = {}) {
+  const config = PROVIDER_RATE_LIMITS[provider];
+  if (!config || !config.rateLimitHeaders) {
+    throw new Error(`Rate limit monitoring not supported for provider: ${provider}`);
+  }
+
+  const testEndpoints = {
+    openai: 'https://api.openai.com/v1/models',
+    anthropic: 'https://api.anthropic.com/v1/messages',
+    google: 'https://generativelanguage.googleapis.com/v1beta/models',
+    groq: 'https://api.groq.com/openai/v1/models',
+    together: 'https://api.together.xyz/v1/models',
+    openrouter: 'https://openrouter.ai/api/v1/models'
+  };
+
+  const endpoint = testEndpoints[provider];
+  if (!endpoint) {
+    throw new Error(`No test endpoint configured for provider: ${provider}`);
+  }
+
+  try {
+    const headers = {
+      'Content-Type': 'application/json'
+    };
+
+    // Add provider-specific authentication
+    if (provider === 'openai' || provider === 'groq' || provider === 'together' || provider === 'openrouter') {
+      headers['Authorization'] = `Bearer ${apiKey}`;
+    } else if (provider === 'anthropic') {
+      headers['x-api-key'] = apiKey;
+    } else if (provider === 'google') {
+      headers['Authorization'] = `Bearer ${apiKey}`;
+    }
+
+    const response = await fetch(endpoint, {
+      method: 'GET',
+      headers
+    });
+
+    // Parse rate limit headers regardless of response status
+    const rateLimitInfo = parseRateLimitHeaders(response.headers, config.rateLimitHeaders);
path: src/rate_limits.js
user: login: gemini-code-assist[bot]
body: ![high](https://img.shields.io/badge/priority-high-orange)

Similar to the issue in `fetchCurrentRateLimits`, the `parseRateLimitHeaders` function expects its second argument to be the `provider` string. Passing `config.rateLimitHeaders` (the header mapping object) here is incorrect and will likely lead to improper parsing of rate limit headers.

Should this be `parseRateLimitHeaders(response.headers, provider)`?

```javascript
    const rateLimitInfo = parseRateLimitHeaders(response.headers, provider);
```
created_at: 2025-05-31T02:06:44Z
author_association: NONE
diff_hunk: @@ -543,6 +741,171 @@ function getRecommendedTier(provider, requirements) {
 // Create a global rate limit tracker instance
 const globalRateLimitTracker = new RateLimitTracker();
 
+/**
+ * Fetches current rate limit information from provider API endpoints
+ * @param {string} provider - Provider name (e.g., 'openai', 'anthropic')
+ * @param {string} apiKey - API key for authentication
+ * @returns {Promise<Object>} Current rate limit status
+ */
+async function fetchCurrentRateLimits(provider, apiKey) {
+  const config = PROVIDER_RATE_LIMITS[provider];
+  if (!config) {
+    throw new Error(`Unsupported provider: ${provider}`);
+  }
+
+  if (!apiKey) {
+    throw new Error(`API key required for ${provider}`);
+  }
+
+  const result = {
+    provider,
+    timestamp: new Date().toISOString(),
+    limits: {},
+    usage: {},
+    remaining: {},
+    errors: []
+  };
+
+  try {
+    // Try rate limit endpoint first
+    if (config.rateLimitEndpoint) {
+      try {
+        const response = await fetch(config.rateLimitEndpoint, {
+          headers: {
+            'Authorization': provider === 'openai' ? `Bearer ${apiKey}` : `x-api-key: ${apiKey}`,
path: src/rate_limits.js
user: login: gemini-code-assist[bot]
body: ![medium](https://img.shields.io/badge/priority-medium-yellow)

The authentication logic here (`provider === 'openai' ? `Bearer ${apiKey}` : `x-api-key: ${apiKey}``) seems to assume that only OpenAI uses 'Bearer' tokens and all other providers use 'x-api-key'. This might not be accurate for all providers (e.g., Google, Groq, TogetherAI also use Bearer tokens).

Could this be made more robust, perhaps by defining the authentication type or header name within each provider's configuration in `PROVIDER_RATE_LIMITS`? This would make it more maintainable and less prone to errors as new providers are added or existing ones change their auth schemes.
created_at: 2025-05-31T02:06:44Z
author_association: NONE
diff_hunk: @@ -543,6 +741,171 @@ function getRecommendedTier(provider, requirements) {
 // Create a global rate limit tracker instance
 const globalRateLimitTracker = new RateLimitTracker();
 
+/**
+ * Fetches current rate limit information from provider API endpoints
+ * @param {string} provider - Provider name (e.g., 'openai', 'anthropic')
+ * @param {string} apiKey - API key for authentication
+ * @returns {Promise<Object>} Current rate limit status
+ */
+async function fetchCurrentRateLimits(provider, apiKey) {
+  const config = PROVIDER_RATE_LIMITS[provider];
+  if (!config) {
+    throw new Error(`Unsupported provider: ${provider}`);
+  }
+
+  if (!apiKey) {
+    throw new Error(`API key required for ${provider}`);
+  }
+
+  const result = {
+    provider,
+    timestamp: new Date().toISOString(),
+    limits: {},
+    usage: {},
+    remaining: {},
+    errors: []
+  };
+
+  try {
+    // Try rate limit endpoint first
+    if (config.rateLimitEndpoint) {
+      try {
+        const response = await fetch(config.rateLimitEndpoint, {
+          headers: {
+            'Authorization': provider === 'openai' ? `Bearer ${apiKey}` : `x-api-key: ${apiKey}`,
+            'Content-Type': 'application/json'
+          }
+        });
+
+        if (response.ok) {
+          const data = await response.json();
+          
+          // Parse rate limit headers if present
+          if (config.rateLimitHeaders) {
+            const headers = parseRateLimitHeaders(response.headers, config.rateLimitHeaders);
+            if (headers) {
+              result.limits = headers.limits;
+              result.remaining = headers.remaining;
+              result.usage = headers.usage;
+            }
+          }
+
+          // Store raw API response
+          result.apiResponse = data;
+        } else {
+          result.errors.push(`Rate limit endpoint returned ${response.status}: ${response.statusText}`);
+        }
+      } catch (error) {
+        result.errors.push(`Rate limit endpoint error: ${error.message}`);
+      }
+    }
+
+    // Try quota endpoint if available
+    if (config.quotaEndpoint) {
+      try {
+        const response = await fetch(config.quotaEndpoint, {
+          headers: {
+            'Authorization': provider === 'openai' ? `Bearer ${apiKey}` : `x-api-key: ${apiKey}`,
+            'Content-Type': 'application/json'
+          }
+        });
+
+        if (response.ok) {
+          const data = await response.json();
+          result.quotaInfo = data;
+        } else {
+          result.errors.push(`Quota endpoint returned ${response.status}: ${response.statusText}`);
+        }
+      } catch (error) {
+        result.errors.push(`Quota endpoint error: ${error.message}`);
+      }
+    }
+
+    // If no live data available, fall back to static configuration
+    if (Object.keys(result.limits).length === 0 && Object.keys(result.usage).length === 0) {
+      result.fallbackToStatic = true;
+      result.staticLimits = config;
+      result.errors.push('No live rate limit data available, using static configuration');
+    }
+
+  } catch (error) {
+    result.errors.push(`General error: ${error.message}`);
+    result.fallbackToStatic = true;
+    result.staticLimits = config;
+  }
+
+  return result;
+}
+
+/**
+ * Monitors rate limits in real-time by making a test request
+ * @param {string} provider - Provider name
+ * @param {string} apiKey - API key for authentication  
+ * @param {Object} options - Request options
+ * @returns {Promise<Object>} Rate limit information from response headers
+ */
+async function monitorRateLimitsViaTestRequest(provider, apiKey, options = {}) {
+  const config = PROVIDER_RATE_LIMITS[provider];
+  if (!config || !config.rateLimitHeaders) {
+    throw new Error(`Rate limit monitoring not supported for provider: ${provider}`);
+  }
+
+  const testEndpoints = {
+    openai: 'https://api.openai.com/v1/models',
+    anthropic: 'https://api.anthropic.com/v1/messages',
+    google: 'https://generativelanguage.googleapis.com/v1beta/models',
+    groq: 'https://api.groq.com/openai/v1/models',
+    together: 'https://api.together.xyz/v1/models',
+    openrouter: 'https://openrouter.ai/api/v1/models'
+  };
+
+  const endpoint = testEndpoints[provider];
+  if (!endpoint) {
+    throw new Error(`No test endpoint configured for provider: ${provider}`);
+  }
+
+  try {
+    const headers = {
+      'Content-Type': 'application/json'
+    };
+
+    // Add provider-specific authentication
+    if (provider === 'openai' || provider === 'groq' || provider === 'together' || provider === 'openrouter') {
+      headers['Authorization'] = `Bearer ${apiKey}`;
+    } else if (provider === 'anthropic') {
+      headers['x-api-key'] = apiKey;
+    } else if (provider === 'google') {
+      headers['Authorization'] = `Bearer ${apiKey}`;
+    }
path: src/rate_limits.js
user: login: gemini-code-assist[bot]
body: ![medium](https://img.shields.io/badge/priority-medium-yellow)

The provider-specific authentication logic here is more detailed than in `fetchCurrentRateLimits`, which is good. However, it's still hardcoded within this function.

To improve maintainability and reduce the chance of this logic becoming out of sync with provider configurations, could we derive the authentication method (e.g., header name and token prefix) from the `PROVIDER_RATE_LIMITS[provider]` config? For example, `config.authType = 'bearer'` or `config.authHeaderName = 'x-api-key'`.
created_at: 2025-05-31T02:06:44Z
author_association: NONE
diff_hunk: @@ -0,0 +1,32 @@
+/**
+ * Rate Limit Utilities
+ */
+const RATE_LIMIT_TYPES = {
+  RPM: 'requests_per_minute',
+  TPM: 'tokens_per_minute', 
+  RPD: 'requests_per_day',
+  TPD: 'tokens_per_day',
+  ASH: 'audio_seconds_per_hour',
+  ASD: 'audio_seconds_per_day',
+  IPM: 'images_per_minute',
+  VPM: 'videos_per_minute',
+  VPD: 'videos_per_day'
+};
path: src/utils/rate_limit_utils.js
user: login: gemini-code-assist[bot]
body: ![medium](https://img.shields.io/badge/priority-medium-yellow)

The `RATE_LIMIT_TYPES` constant defined here appears to be a duplicate of the one already defined in `src/rate_limits.js` (lines 34-44).

To maintain a single source of truth and avoid potential inconsistencies, would it be better to export `RATE_LIMIT_TYPES` from `src/rate_limits.js` (or a shared constants file) and import it here if needed? Or, if this utils file is intended to be standalone, ensure its definition is comprehensive and consider how to manage consistency if one of them changes.
created_at: 2025-05-31T02:06:44Z
author_association: NONE
diff_hunk: @@ -91,61 +128,110 @@ const PROVIDER_RATE_LIMITS = {
         "claude-3.5-sonnet": 20000
       },
       [RATE_LIMIT_TYPES.TPD]: 300000,
-      notes: "Limits apply to all Claude 3 models with slight TPM variation by model"
+      notes: "Standard tier, varies by model"
     },
     enterprise: {
       [RATE_LIMIT_TYPES.RPM]: 50,
       [RATE_LIMIT_TYPES.TPM]: 100000,
       [RATE_LIMIT_TYPES.TPD]: 3000000,
-      notes: "Custom enterprise tier with higher limits"
-    },
-    documentation: 'https://docs.anthropic.com/en/api/rate-limits',
-    headers: ['anthropic-ratelimit-requests-remaining', 'anthropic-ratelimit-tokens-remaining']
+      notes: "Enterprise tier with higher limits"
+    },
+    // Real-time detection via API headers
+    rateLimitHeaders: {
+      requestsRemaining: 'anthropic-ratelimit-requests-remaining',
+      tokensRemaining: 'anthropic-ratelimit-tokens-remaining',
+      requestsReset: 'anthropic-ratelimit-requests-reset',
+      tokensReset: 'anthropic-ratelimit-tokens-reset',
+      retryAfter: 'retry-after'
+    },
+    // Live rate limit endpoints
+    rateLimitEndpoint: 'https://api.anthropic.com/v1/usage',
+    quotaEndpoint: 'https://api.anthropic.com/v1/billing/subscription',
+    // Extract from 429 error responses  
+    errorPatterns: {
+      rateLimitExceeded: /rate_limit_error/,
+      quotaExceeded: /Your credit balance is too low/
+    },
+    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
+    documentation: 'https://docs.anthropic.com/en/api/rate-limits'
   },
 
-  // Google Gemini rate limits (estimated - official detailed limits not publicly released)
+  // Google Gemini rate limits - Documentation endpoint accessible
+  // NOTE: Rate limit values below are from documentation research, NOT from API calls
+  // API endpoint accessibility: VERIFIED - Documentation endpoint accessible (200 status in collected_info)
+  // Models endpoint: BLOCKED (403 error in collected_info)
+  // Pricing endpoint: BLOCKED (301 redirect in collected_info)
   google: {
-    preview: {
+    free: {
       [RATE_LIMIT_TYPES.RPM]: 15,
-      [RATE_LIMIT_TYPES.TPM]: 250000,
+      [RATE_LIMIT_TYPES.TPM]: 32000,
       [RATE_LIMIT_TYPES.RPD]: 1500,
-      notes: "Preview estimates - detailed rate limits not publicly released"
+      notes: "Free tier limits"
     },
-    tier1: {
+    paid: {
       [RATE_LIMIT_TYPES.RPM]: 2000,
       [RATE_LIMIT_TYPES.TPM]: 4000000,
-      [RATE_LIMIT_TYPES.RPD]: null, // No daily limit specified
-      notes: "Estimated values - refer to official documentation for confirmation"
-    },
-    tier2: {
-      [RATE_LIMIT_TYPES.RPM]: 10000,
-      [RATE_LIMIT_TYPES.TPM]: 4000000,
       [RATE_LIMIT_TYPES.RPD]: null,
-      notes: "Estimated values - refer to official documentation for confirmation"
-    },
-    documentation: 'https://ai.google.dev/gemini-api/docs/quota',
-    headers: ['x-goog-quota-user', 'x-goog-api-quota-user']
+      notes: "Paid tier limits"
+    },
+    // Real-time detection via API headers
+    rateLimitHeaders: {
+      quotaUser: 'x-goog-quota-user',
+      apiQuotaUser: 'x-goog-api-quota-user',
+      rateLimitRemaining: 'x-goog-ratelimit-remaining',
+      rateLimitReset: 'x-goog-ratelimit-reset'
+    },
+    // Live rate limit endpoints
+    rateLimitEndpoint: 'https://generativelanguage.googleapis.com/v1beta/models:countTokens',
+    quotaEndpoint: 'https://generativelanguage.googleapis.com/v1beta/models',
+    // Current quota endpoint
+    quotaEndpoint: '/v1beta/models:quota',
path: src/rate_limits.js
user: login: sourcery-ai[bot]
body: **issue (bug_risk):** Duplicate `quotaEndpoint` keys override earlier value

The second `quotaEndpoint` entry will overwrite the first. Please rename or merge these properties for clarity.
created_at: 2025-05-31T02:06:52Z
author_association: CONTRIBUTOR
diff_hunk: @@ -447,7 +645,7 @@ class RateLimitTracker {
  */
 function parseRateLimitHeaders(headers, provider) {
   const providerConfig = PROVIDER_RATE_LIMITS[provider];
-  if (!providerConfig || !providerConfig.headers) {
+  if (!providerConfig || !providerConfig.rateLimitHeaders) {
path: src/rate_limits.js
user: login: sourcery-ai[bot]
body: **issue (bug_risk):** Direct header access may not work with Fetch API `Headers`

Use `headers.get(headerName)` instead of bracket notation to access header values from a Fetch API `Headers` object.
created_at: 2025-05-31T02:06:52Z
author_association: CONTRIBUTOR
diff_hunk: @@ -0,0 +1,103 @@
+/**
+ * Generic Rate Limit Manager
+ * 
+ * Reusable rate limiting system that can be configured for any service
+ */
+class RateLimitManager {
+  /**
+   * @param {Object} config - Rate limit configuration
+   * @param {Object} config.limits - Service limits (e.g., { requests_per_minute: 100 })
+   * @param {Array} [config.headers=[]] - Custom rate limit headers to parse
+   */
+  constructor(config) {
+    this.config = config;
+    this.usage = {
+      minute: [],
+      day: [],
+      tokens: { minute: 0, day: 0 }
+    };
+  }
+
+  /**
+   * Record a request for rate limit tracking
+   * @param {number} tokens - Number of tokens/units used
+   */
+  recordRequest(tokens = 0) {
+    const now = Date.now();
+    this.cleanOldEntries();
+    
+    this.usage.minute.push(now);
+    this.usage.day.push(now);
+    this.usage.tokens.minute += tokens;
+    this.usage.tokens.day += tokens;
+  }
+
+  /**
+   * Check if request would exceed limits
+   * @param {number} tokens - Tokens/units for the request
+   * @returns {Object} - { allowed: boolean, waitTime: number, reason: string }
+   */
+  checkRateLimit(tokens = 0) {
+    this.cleanOldEntries();
+    const { limits } = this.config;
+
+    // Check requests per minute
+    if (limits.requests_per_minute && this.usage.minute.length >= limits.requests_per_minute) {
+      const oldest = Math.min(...this.usage.minute);
+      const waitTime = 60000 - (Date.now() - oldest);
+      return {
+        allowed: false,
+        waitTime: Math.max(0, waitTime),
+        reason: `RPM limit exceeded (${this.usage.minute.length}/${limits.requests_per_minute})`
+      };
+    }
+
+    // Check tokens per minute
+    if (limits.tokens_per_minute && (this.usage.tokens.minute + tokens) > limits.tokens_per_minute) {
+      return {
+        allowed: false,
+        waitTime: 60000,
+        reason: `TPM limit would be exceeded (${this.usage.tokens.minute + tokens}/${limits.tokens_per_minute})`
+      };
+    }
+
+    return { allowed: true, waitTime: 0, reason: 'Within limits' };
+  }
+
+  /**
+   * Clean old entries outside time windows
+   */
+  cleanOldEntries() {
path: src/utils/rate_limit_manager.js
user: login: sourcery-ai[bot]
body: **issue (bug_risk):** tokens counters not updated on partial cleanup

Recalculate `this.usage.tokens` after removing expired entries, or track tokens per entry to ensure accurate counts when cleaning up.
created_at: 2025-05-31T02:06:52Z
author_association: CONTRIBUTOR
diff_hunk: @@ -543,6 +741,171 @@ function getRecommendedTier(provider, requirements) {
 // Create a global rate limit tracker instance
 const globalRateLimitTracker = new RateLimitTracker();
 
+/**
+ * Fetches current rate limit information from provider API endpoints
+ * @param {string} provider - Provider name (e.g., 'openai', 'anthropic')
+ * @param {string} apiKey - API key for authentication
+ * @returns {Promise<Object>} Current rate limit status
+ */
+async function fetchCurrentRateLimits(provider, apiKey) {
+  const config = PROVIDER_RATE_LIMITS[provider];
+  if (!config) {
+    throw new Error(`Unsupported provider: ${provider}`);
+  }
+
+  if (!apiKey) {
+    throw new Error(`API key required for ${provider}`);
+  }
+
+  const result = {
+    provider,
+    timestamp: new Date().toISOString(),
+    limits: {},
+    usage: {},
+    remaining: {},
+    errors: []
+  };
+
+  try {
+    // Try rate limit endpoint first
+    if (config.rateLimitEndpoint) {
+      try {
+        const response = await fetch(config.rateLimitEndpoint, {
+          headers: {
+            'Authorization': provider === 'openai' ? `Bearer ${apiKey}` : `x-api-key: ${apiKey}`,
path: src/rate_limits.js
user: login: sourcery-ai[bot]
body: **issue (bug_risk):** Incorrect use of `Authorization` header for non-OpenAI providers

For non-OpenAI providers, use the correct header: `{ 'x-api-key': apiKey }` instead of placing the key in the `Authorization` header.
created_at: 2025-05-31T02:06:52Z
author_association: CONTRIBUTOR
diff_hunk: @@ -0,0 +1,103 @@
+/**
+ * Generic Rate Limit Manager
+ * 
+ * Reusable rate limiting system that can be configured for any service
+ */
+class RateLimitManager {
+  /**
+   * @param {Object} config - Rate limit configuration
+   * @param {Object} config.limits - Service limits (e.g., { requests_per_minute: 100 })
+   * @param {Array} [config.headers=[]] - Custom rate limit headers to parse
+   */
+  constructor(config) {
+    this.config = config;
+    this.usage = {
+      minute: [],
+      day: [],
+      tokens: { minute: 0, day: 0 }
+    };
+  }
+
+  /**
+   * Record a request for rate limit tracking
+   * @param {number} tokens - Number of tokens/units used
+   */
+  recordRequest(tokens = 0) {
+    const now = Date.now();
+    this.cleanOldEntries();
+    
+    this.usage.minute.push(now);
+    this.usage.day.push(now);
+    this.usage.tokens.minute += tokens;
+    this.usage.tokens.day += tokens;
+  }
+
+  /**
+   * Check if request would exceed limits
+   * @param {number} tokens - Tokens/units for the request
+   * @returns {Object} - { allowed: boolean, waitTime: number, reason: string }
+   */
+  checkRateLimit(tokens = 0) {
+    this.cleanOldEntries();
+    const { limits } = this.config;
+
+    // Check requests per minute
+    if (limits.requests_per_minute && this.usage.minute.length >= limits.requests_per_minute) {
+      const oldest = Math.min(...this.usage.minute);
+      const waitTime = 60000 - (Date.now() - oldest);
+      return {
+        allowed: false,
+        waitTime: Math.max(0, waitTime),
+        reason: `RPM limit exceeded (${this.usage.minute.length}/${limits.requests_per_minute})`
+      };
+    }
+
+    // Check tokens per minute
+    if (limits.tokens_per_minute && (this.usage.tokens.minute + tokens) > limits.tokens_per_minute) {
+      return {
+        allowed: false,
+        waitTime: 60000,
+        reason: `TPM limit would be exceeded (${this.usage.tokens.minute + tokens}/${limits.tokens_per_minute})`
+      };
+    }
+
+    return { allowed: true, waitTime: 0, reason: 'Within limits' };
+  }
+
+  /**
+   * Clean old entries outside time windows
+   */
+  cleanOldEntries() {
+    const now = Date.now();
+    const oneMinuteAgo = now - 60000;
+    const oneDayAgo = now - 86400000;
+
+    this.usage.minute = this.usage.minute.filter(t => t > oneMinuteAgo);
+    this.usage.day = this.usage.day.filter(t => t > oneDayAgo);
+    
+    if (this.usage.minute.length === 0) this.usage.tokens.minute = 0;
path: src/utils/rate_limit_manager.js
user: login: sourcery-ai[bot]
body: **suggestion (code-quality):** Use block braces for ifs, whiles, etc. ([`use-braces`](https://docs.sourcery.ai/Reference/Rules-and-In-Line-Suggestions/JavaScript/Default-Rules/use-braces))

```suggestion
    if (this.usage.minute.length === 0) {
```

<br/><details><summary>Explanation</summary>It is recommended to always use braces and create explicit statement blocks.

Using the allowed syntax to just write a single statement can lead to very confusing
situations, especially where subsequently a developer might add another statement
while forgetting to add the braces (meaning that this wouldn't be included in the condition).
</details>
created_at: 2025-05-31T02:06:52Z
author_association: CONTRIBUTOR
diff_hunk: @@ -0,0 +1,103 @@
+/**
+ * Generic Rate Limit Manager
+ * 
+ * Reusable rate limiting system that can be configured for any service
+ */
+class RateLimitManager {
+  /**
+   * @param {Object} config - Rate limit configuration
+   * @param {Object} config.limits - Service limits (e.g., { requests_per_minute: 100 })
+   * @param {Array} [config.headers=[]] - Custom rate limit headers to parse
+   */
+  constructor(config) {
+    this.config = config;
+    this.usage = {
+      minute: [],
+      day: [],
+      tokens: { minute: 0, day: 0 }
+    };
+  }
+
+  /**
+   * Record a request for rate limit tracking
+   * @param {number} tokens - Number of tokens/units used
+   */
+  recordRequest(tokens = 0) {
+    const now = Date.now();
+    this.cleanOldEntries();
+    
+    this.usage.minute.push(now);
+    this.usage.day.push(now);
+    this.usage.tokens.minute += tokens;
+    this.usage.tokens.day += tokens;
+  }
+
+  /**
+   * Check if request would exceed limits
+   * @param {number} tokens - Tokens/units for the request
+   * @returns {Object} - { allowed: boolean, waitTime: number, reason: string }
+   */
+  checkRateLimit(tokens = 0) {
+    this.cleanOldEntries();
+    const { limits } = this.config;
+
+    // Check requests per minute
+    if (limits.requests_per_minute && this.usage.minute.length >= limits.requests_per_minute) {
+      const oldest = Math.min(...this.usage.minute);
+      const waitTime = 60000 - (Date.now() - oldest);
+      return {
+        allowed: false,
+        waitTime: Math.max(0, waitTime),
+        reason: `RPM limit exceeded (${this.usage.minute.length}/${limits.requests_per_minute})`
+      };
+    }
+
+    // Check tokens per minute
+    if (limits.tokens_per_minute && (this.usage.tokens.minute + tokens) > limits.tokens_per_minute) {
+      return {
+        allowed: false,
+        waitTime: 60000,
+        reason: `TPM limit would be exceeded (${this.usage.tokens.minute + tokens}/${limits.tokens_per_minute})`
+      };
+    }
+
+    return { allowed: true, waitTime: 0, reason: 'Within limits' };
+  }
+
+  /**
+   * Clean old entries outside time windows
+   */
+  cleanOldEntries() {
+    const now = Date.now();
+    const oneMinuteAgo = now - 60000;
+    const oneDayAgo = now - 86400000;
+
+    this.usage.minute = this.usage.minute.filter(t => t > oneMinuteAgo);
+    this.usage.day = this.usage.day.filter(t => t > oneDayAgo);
+    
+    if (this.usage.minute.length === 0) this.usage.tokens.minute = 0;
+    if (this.usage.day.length === 0) this.usage.tokens.day = 0;
path: src/utils/rate_limit_manager.js
user: login: sourcery-ai[bot]
body: **suggestion (code-quality):** Use block braces for ifs, whiles, etc. ([`use-braces`](https://docs.sourcery.ai/Reference/Rules-and-In-Line-Suggestions/JavaScript/Default-Rules/use-braces))

```suggestion
    if (this.usage.day.length === 0) {
```

<br/><details><summary>Explanation</summary>It is recommended to always use braces and create explicit statement blocks.

Using the allowed syntax to just write a single statement can lead to very confusing
situations, especially where subsequently a developer might add another statement
while forgetting to add the braces (meaning that this wouldn't be included in the condition).
</details>
created_at: 2025-05-31T02:06:53Z
author_association: CONTRIBUTOR
diff_hunk: @@ -0,0 +1,32 @@
+/**
+ * Rate Limit Utilities
+ */
+const RATE_LIMIT_TYPES = {
+  RPM: 'requests_per_minute',
+  TPM: 'tokens_per_minute', 
+  RPD: 'requests_per_day',
+  TPD: 'tokens_per_day',
+  ASH: 'audio_seconds_per_hour',
+  ASD: 'audio_seconds_per_day',
+  IPM: 'images_per_minute',
+  VPM: 'videos_per_minute',
+  VPD: 'videos_per_day'
+};
path: src/utils/rate_limit_utils.js
user: login: coderabbitai[bot]
body: _🛠️ Refactor suggestion_

**Eliminate code duplication with src/rate_limits.js.**

The `RATE_LIMIT_TYPES` constant is duplicated identically in `src/rate_limits.js` lines 34-44. This creates maintenance overhead and potential inconsistency.



Consider importing from a single source:

```diff
-const RATE_LIMIT_TYPES = {
-  RPM: 'requests_per_minute',
-  TPM: 'tokens_per_minute', 
-  RPD: 'requests_per_day',
-  TPD: 'tokens_per_day',
-  ASH: 'audio_seconds_per_hour',
-  ASD: 'audio_seconds_per_day',
-  IPM: 'images_per_minute',
-  VPM: 'videos_per_minute',
-  VPD: 'videos_per_day'
-};
+const { RATE_LIMIT_TYPES } = require('../rate_limits');
```


<!-- suggestion_start -->

<details>
<summary>📝 Committable suggestion</summary>

> ‼️ **IMPORTANT**
> Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

```suggestion
// src/utils/rate_limit_utils.js
-const RATE_LIMIT_TYPES = {
-  RPM: 'requests_per_minute',
-  TPM: 'tokens_per_minute', 
-  RPD: 'requests_per_day',
-  TPD: 'tokens_per_day',
-  ASH: 'audio_seconds_per_hour',
-  ASD: 'audio_seconds_per_day',
-  IPM: 'images_per_minute',
-  VPM: 'videos_per_minute',
-  VPD: 'videos_per_day'
-};
+const { RATE_LIMIT_TYPES } = require('../rate_limits');
```

</details>

<!-- suggestion_end -->

<details>
<summary>🤖 Prompt for AI Agents</summary>

```
In src/utils/rate_limit_utils.js lines 4 to 14, the RATE_LIMIT_TYPES constant is
duplicated from src/rate_limits.js lines 34 to 44. To fix this, remove the
RATE_LIMIT_TYPES definition from rate_limit_utils.js and instead import
RATE_LIMIT_TYPES from src/rate_limits.js. This will centralize the constant
definition and prevent duplication.
```

</details>

<!-- This is an auto-generated comment by CodeRabbit -->
created_at: 2025-05-31T02:07:58Z
author_association: NONE
diff_hunk: @@ -543,6 +741,171 @@ function getRecommendedTier(provider, requirements) {
 // Create a global rate limit tracker instance
 const globalRateLimitTracker = new RateLimitTracker();
 
+/**
+ * Fetches current rate limit information from provider API endpoints
+ * @param {string} provider - Provider name (e.g., 'openai', 'anthropic')
+ * @param {string} apiKey - API key for authentication
+ * @returns {Promise<Object>} Current rate limit status
+ */
+async function fetchCurrentRateLimits(provider, apiKey) {
+  const config = PROVIDER_RATE_LIMITS[provider];
+  if (!config) {
+    throw new Error(`Unsupported provider: ${provider}`);
+  }
+
+  if (!apiKey) {
+    throw new Error(`API key required for ${provider}`);
+  }
+
+  const result = {
+    provider,
+    timestamp: new Date().toISOString(),
+    limits: {},
+    usage: {},
+    remaining: {},
+    errors: []
+  };
+
+  try {
+    // Try rate limit endpoint first
+    if (config.rateLimitEndpoint) {
+      try {
+        const response = await fetch(config.rateLimitEndpoint, {
+          headers: {
+            'Authorization': provider === 'openai' ? `Bearer ${apiKey}` : `x-api-key: ${apiKey}`,
+            'Content-Type': 'application/json'
+          }
+        });
+
+        if (response.ok) {
+          const data = await response.json();
+          
+          // Parse rate limit headers if present
+          if (config.rateLimitHeaders) {
+            const headers = parseRateLimitHeaders(response.headers, config.rateLimitHeaders);
+            if (headers) {
+              result.limits = headers.limits;
+              result.remaining = headers.remaining;
+              result.usage = headers.usage;
+            }
+          }
+
+          // Store raw API response
+          result.apiResponse = data;
+        } else {
+          result.errors.push(`Rate limit endpoint returned ${response.status}: ${response.statusText}`);
+        }
+      } catch (error) {
+        result.errors.push(`Rate limit endpoint error: ${error.message}`);
+      }
+    }
+
+    // Try quota endpoint if available
+    if (config.quotaEndpoint) {
+      try {
+        const response = await fetch(config.quotaEndpoint, {
+          headers: {
+            'Authorization': provider === 'openai' ? `Bearer ${apiKey}` : `x-api-key: ${apiKey}`,
+            'Content-Type': 'application/json'
+          }
+        });
+
+        if (response.ok) {
+          const data = await response.json();
+          result.quotaInfo = data;
+        } else {
+          result.errors.push(`Quota endpoint returned ${response.status}: ${response.statusText}`);
+        }
+      } catch (error) {
+        result.errors.push(`Quota endpoint error: ${error.message}`);
+      }
+    }
+
+    // If no live data available, fall back to static configuration
+    if (Object.keys(result.limits).length === 0 && Object.keys(result.usage).length === 0) {
+      result.fallbackToStatic = true;
+      result.staticLimits = config;
+      result.errors.push('No live rate limit data available, using static configuration');
+    }
+
+  } catch (error) {
+    result.errors.push(`General error: ${error.message}`);
+    result.fallbackToStatic = true;
+    result.staticLimits = config;
+  }
+
+  return result;
+}
+
+/**
+ * Monitors rate limits in real-time by making a test request
+ * @param {string} provider - Provider name
+ * @param {string} apiKey - API key for authentication  
+ * @param {Object} options - Request options
+ * @returns {Promise<Object>} Rate limit information from response headers
+ */
+async function monitorRateLimitsViaTestRequest(provider, apiKey, options = {}) {
+  const config = PROVIDER_RATE_LIMITS[provider];
+  if (!config || !config.rateLimitHeaders) {
+    throw new Error(`Rate limit monitoring not supported for provider: ${provider}`);
+  }
+
+  const testEndpoints = {
+    openai: 'https://api.openai.com/v1/models',
+    anthropic: 'https://api.anthropic.com/v1/messages',
+    google: 'https://generativelanguage.googleapis.com/v1beta/models',
+    groq: 'https://api.groq.com/openai/v1/models',
+    together: 'https://api.together.xyz/v1/models',
+    openrouter: 'https://openrouter.ai/api/v1/models'
+  };
+
+  const endpoint = testEndpoints[provider];
+  if (!endpoint) {
+    throw new Error(`No test endpoint configured for provider: ${provider}`);
+  }
+
+  try {
+    const headers = {
+      'Content-Type': 'application/json'
+    };
+
+    // Add provider-specific authentication
+    if (provider === 'openai' || provider === 'groq' || provider === 'together' || provider === 'openrouter') {
+      headers['Authorization'] = `Bearer ${apiKey}`;
+    } else if (provider === 'anthropic') {
+      headers['x-api-key'] = apiKey;
+    } else if (provider === 'google') {
+      headers['Authorization'] = `Bearer ${apiKey}`;
+    }
+
+    const response = await fetch(endpoint, {
+      method: 'GET',
+      headers
+    });
+
+    // Parse rate limit headers regardless of response status
+    const rateLimitInfo = parseRateLimitHeaders(response.headers, config.rateLimitHeaders);
path: src/rate_limits.js
user: login: coderabbitai[bot]
body: _⚠️ Potential issue_

**Fix incorrect parameter passing to `parseRateLimitHeaders`.**

The function expects `(headers, provider)` but is being called with `(response.headers, config.rateLimitHeaders)`.


```diff
-    const rateLimitInfo = parseRateLimitHeaders(response.headers, config.rateLimitHeaders);
+    const rateLimitInfo = parseRateLimitHeaders(response.headers, provider);
```


> Committable suggestion skipped: line range outside the PR's diff.

<details>
<summary>🤖 Prompt for AI Agents</summary>

```
In src/rate_limits.js at line 887, the call to parseRateLimitHeaders incorrectly
passes config.rateLimitHeaders as the second argument instead of the expected
provider. Update the call to pass the correct provider parameter as the second
argument while keeping response.headers as the first argument.
```

</details>

<!-- This is an auto-generated comment by CodeRabbit -->

✅ Addressed in commit e1146c1
created_at: 2025-05-31T02:07:58Z
author_association: NONE
diff_hunk: @@ -543,6 +741,171 @@ function getRecommendedTier(provider, requirements) {
 // Create a global rate limit tracker instance
 const globalRateLimitTracker = new RateLimitTracker();
 
+/**
+ * Fetches current rate limit information from provider API endpoints
+ * @param {string} provider - Provider name (e.g., 'openai', 'anthropic')
+ * @param {string} apiKey - API key for authentication
+ * @returns {Promise<Object>} Current rate limit status
+ */
+async function fetchCurrentRateLimits(provider, apiKey) {
+  const config = PROVIDER_RATE_LIMITS[provider];
+  if (!config) {
+    throw new Error(`Unsupported provider: ${provider}`);
+  }
+
+  if (!apiKey) {
+    throw new Error(`API key required for ${provider}`);
+  }
+
+  const result = {
+    provider,
+    timestamp: new Date().toISOString(),
+    limits: {},
+    usage: {},
+    remaining: {},
+    errors: []
+  };
+
+  try {
+    // Try rate limit endpoint first
+    if (config.rateLimitEndpoint) {
+      try {
+        const response = await fetch(config.rateLimitEndpoint, {
+          headers: {
+            'Authorization': provider === 'openai' ? `Bearer ${apiKey}` : `x-api-key: ${apiKey}`,
+            'Content-Type': 'application/json'
+          }
+        });
+
+        if (response.ok) {
+          const data = await response.json();
+          
+          // Parse rate limit headers if present
+          if (config.rateLimitHeaders) {
+            const headers = parseRateLimitHeaders(response.headers, config.rateLimitHeaders);
+            if (headers) {
path: src/rate_limits.js
user: login: coderabbitai[bot]
body: _⚠️ Potential issue_

**Fix incorrect parameter passing to `parseRateLimitHeaders`.**

The function expects `(headers, provider)` but is being called with `(response.headers, config.rateLimitHeaders)`.


```diff
-            const headers = parseRateLimitHeaders(response.headers, config.rateLimitHeaders);
+            const headers = parseRateLimitHeaders(response.headers, provider);
```


> Committable suggestion skipped: line range outside the PR's diff.

<details>
<summary>🤖 Prompt for AI Agents</summary>

```
In src/rate_limits.js at line 786, the call to parseRateLimitHeaders incorrectly
passes response.headers and config.rateLimitHeaders as parameters, but the
function expects headers and provider. Update the call to pass headers as the
first argument and provider as the second argument accordingly to match the
expected parameter order.
```

</details>

<!-- This is an auto-generated comment by CodeRabbit -->

✅ Addressed in commit e1146c1
created_at: 2025-05-31T02:07:58Z
author_association: NONE
diff_hunk: @@ -91,61 +128,110 @@ const PROVIDER_RATE_LIMITS = {
         "claude-3.5-sonnet": 20000
       },
       [RATE_LIMIT_TYPES.TPD]: 300000,
-      notes: "Limits apply to all Claude 3 models with slight TPM variation by model"
+      notes: "Standard tier, varies by model"
     },
     enterprise: {
       [RATE_LIMIT_TYPES.RPM]: 50,
       [RATE_LIMIT_TYPES.TPM]: 100000,
       [RATE_LIMIT_TYPES.TPD]: 3000000,
-      notes: "Custom enterprise tier with higher limits"
-    },
-    documentation: 'https://docs.anthropic.com/en/api/rate-limits',
-    headers: ['anthropic-ratelimit-requests-remaining', 'anthropic-ratelimit-tokens-remaining']
+      notes: "Enterprise tier with higher limits"
+    },
+    // Real-time detection via API headers
+    rateLimitHeaders: {
+      requestsRemaining: 'anthropic-ratelimit-requests-remaining',
+      tokensRemaining: 'anthropic-ratelimit-tokens-remaining',
+      requestsReset: 'anthropic-ratelimit-requests-reset',
+      tokensReset: 'anthropic-ratelimit-tokens-reset',
+      retryAfter: 'retry-after'
+    },
+    // Live rate limit endpoints
+    rateLimitEndpoint: 'https://api.anthropic.com/v1/usage',
+    quotaEndpoint: 'https://api.anthropic.com/v1/billing/subscription',
+    // Extract from 429 error responses  
+    errorPatterns: {
+      rateLimitExceeded: /rate_limit_error/,
+      quotaExceeded: /Your credit balance is too low/
+    },
+    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
+    documentation: 'https://docs.anthropic.com/en/api/rate-limits'
   },
 
-  // Google Gemini rate limits (estimated - official detailed limits not publicly released)
+  // Google Gemini rate limits - Documentation endpoint accessible
+  // NOTE: Rate limit values below are from documentation research, NOT from API calls
+  // API endpoint accessibility: VERIFIED - Documentation endpoint accessible (200 status in collected_info)
+  // Models endpoint: BLOCKED (403 error in collected_info)
+  // Pricing endpoint: BLOCKED (301 redirect in collected_info)
   google: {
-    preview: {
+    free: {
       [RATE_LIMIT_TYPES.RPM]: 15,
-      [RATE_LIMIT_TYPES.TPM]: 250000,
+      [RATE_LIMIT_TYPES.TPM]: 32000,
       [RATE_LIMIT_TYPES.RPD]: 1500,
-      notes: "Preview estimates - detailed rate limits not publicly released"
+      notes: "Free tier limits"
     },
-    tier1: {
+    paid: {
       [RATE_LIMIT_TYPES.RPM]: 2000,
       [RATE_LIMIT_TYPES.TPM]: 4000000,
-      [RATE_LIMIT_TYPES.RPD]: null, // No daily limit specified
-      notes: "Estimated values - refer to official documentation for confirmation"
-    },
-    tier2: {
-      [RATE_LIMIT_TYPES.RPM]: 10000,
-      [RATE_LIMIT_TYPES.TPM]: 4000000,
       [RATE_LIMIT_TYPES.RPD]: null,
-      notes: "Estimated values - refer to official documentation for confirmation"
-    },
-    documentation: 'https://ai.google.dev/gemini-api/docs/quota',
-    headers: ['x-goog-quota-user', 'x-goog-api-quota-user']
+      notes: "Paid tier limits"
+    },
+    // Real-time detection via API headers
+    rateLimitHeaders: {
+      quotaUser: 'x-goog-quota-user',
+      apiQuotaUser: 'x-goog-api-quota-user',
+      rateLimitRemaining: 'x-goog-ratelimit-remaining',
+      rateLimitReset: 'x-goog-ratelimit-reset'
+    },
+    // Live rate limit endpoints
+    rateLimitEndpoint: 'https://generativelanguage.googleapis.com/v1beta/models:countTokens',
+    quotaEndpoint: 'https://generativelanguage.googleapis.com/v1beta/models',
+    // Current quota endpoint
+    quotaEndpoint: '/v1beta/models:quota',
+    // Extract from 429 error responses
path: src/rate_limits.js
user: login: coderabbitai[bot]
body: _⚠️ Potential issue_

**Remove duplicate `quotaEndpoint` property.**

The `quotaEndpoint` property is defined twice for the Google provider configuration.


```diff
     // Live rate limit endpoints
     rateLimitEndpoint: 'https://generativelanguage.googleapis.com/v1beta/models:countTokens',
     quotaEndpoint: 'https://generativelanguage.googleapis.com/v1beta/models',
-    // Current quota endpoint
-    quotaEndpoint: '/v1beta/models:quota',
```


<!-- suggestion_start -->

<details>
<summary>📝 Committable suggestion</summary>

> ‼️ **IMPORTANT**
> Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

```suggestion
    // Live rate limit endpoints
    rateLimitEndpoint: 'https://generativelanguage.googleapis.com/v1beta/models:countTokens',
    quotaEndpoint: 'https://generativelanguage.googleapis.com/v1beta/models',
    // Extract from 429 error responses
```

</details>

<!-- suggestion_end -->

<details>
<summary>🧰 Tools</summary>

<details>
<summary>🪛 Biome (1.9.4)</summary>

[error] 186-186: This property value named quotaEndpoint is later overwritten by an object member with the same name.

Overwritten with this value.

If an object property with the same name is defined multiple times (except when combining a getter with a setter), only the last definition makes it into the object and previous definitions are ignored.
Unsafe fix: Remove this property value named quotaEndpoint


(lint/suspicious/noDuplicateObjectKeys)

</details>

</details>

<details>
<summary>🤖 Prompt for AI Agents</summary>

```
In src/rate_limits.js around lines 185 to 189, there are two definitions of the
quotaEndpoint property in the Google provider configuration, causing a duplicate
key issue. Remove one of the quotaEndpoint entries to keep only a single,
correct definition for this property.
```

</details>

<!-- This is an auto-generated comment by CodeRabbit -->

✅ Addressed in commit e1146c1
created_at: 2025-05-31T02:07:58Z
author_association: NONE
diff_hunk: @@ -73,14 +91,41 @@ const PROVIDER_RATE_LIMITS = {
         "gpt-4-turbo": 2000000,
         "gpt-4": 300000
       },
-      notes: "$1,000 paid and 30+ days since first successful payment"
+      notes: "$1000+ paid, 30+ days"
+    },
+    documentation: 'https://platform.openai.com/docs/guides/rate-limits',
+    auth: {
+      type: 'bearer',
+      headerName: 'Authorization'
     },
-    documentation: 'https://help.openai.com/en/articles/7127986-what-are-the-gpt-4-rate-limits',
-    headers: ['x-ratelimit-limit-requests', 'x-ratelimit-remaining-requests', 'x-ratelimit-reset-requests']
+    // Real-time detection via API headers
+    rateLimitHeaders: {
+      requestsLimit: 'x-ratelimit-limit-requests',
+      requestsRemaining: 'x-ratelimit-remaining-requests',
+      tokensLimit: 'x-ratelimit-limit-tokens',
+      tokensRemaining: 'x-ratelimit-remaining-tokens',
+      requestsReset: 'x-ratelimit-reset-requests',
+      retryAfter: 'retry-after'
+    },
+    // Live rate limit endpoints
+    rateLimitEndpoint: 'https://api.openai.com/v1/usage',
+    quotaEndpoint: 'https://api.openai.com/v1/dashboard/billing/subscription',
+    // Extract from 429 error responses
+    errorPatterns: {
+      rateLimitExceeded: /Rate limit exceeded/,
+      quotaExceeded: /You exceeded your current quota/
+    },
+    auth: {
+      type: 'bearer',
+      headerName: 'Authorization'
+    }
   },
path: src/rate_limits.js
user: login: coderabbitai[bot]
body: _⚠️ Potential issue_

**Fix duplicate `auth` property.**

The `auth` property is defined twice (lines 97-100 and 118-121), causing the first definition to be overwritten. This creates inconsistent authentication configuration.



```diff
-    auth: {
-      type: 'bearer',
-      headerName: 'Authorization'
-    },
     // Real-time detection via API headers
     rateLimitHeaders: {
       requestsLimit: 'x-ratelimit-limit-requests',
       requestsRemaining: 'x-ratelimit-remaining-requests',
       tokensLimit: 'x-ratelimit-limit-tokens',
       tokensRemaining: 'x-ratelimit-remaining-tokens',
       requestsReset: 'x-ratelimit-reset-requests',
       retryAfter: 'retry-after'
     },
     // Live rate limit endpoints
     rateLimitEndpoint: 'https://api.openai.com/v1/usage',
     quotaEndpoint: 'https://api.openai.com/v1/dashboard/billing/subscription',
     // Extract from 429 error responses
     errorPatterns: {
       rateLimitExceeded: /Rate limit exceeded/,
       quotaExceeded: /You exceeded your current quota/
     },
     auth: {
       type: 'bearer',
       headerName: 'Authorization'
     }
```


<!-- suggestion_start -->

<details>
<summary>📝 Committable suggestion</summary>

> ‼️ **IMPORTANT**
> Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

```suggestion
    // Real-time detection via API headers
    rateLimitHeaders: {
      requestsLimit: 'x-ratelimit-limit-requests',
      requestsRemaining: 'x-ratelimit-remaining-requests',
      tokensLimit: 'x-ratelimit-limit-tokens',
      tokensRemaining: 'x-ratelimit-remaining-tokens',
      requestsReset: 'x-ratelimit-reset-requests',
      retryAfter: 'retry-after'
    },
    // Live rate limit endpoints
    rateLimitEndpoint: 'https://api.openai.com/v1/usage',
    quotaEndpoint: 'https://api.openai.com/v1/dashboard/billing/subscription',
    // Extract from 429 error responses
    errorPatterns: {
      rateLimitExceeded: /Rate limit exceeded/,
      quotaExceeded: /You exceeded your current quota/
    },
    auth: {
      type: 'bearer',
      headerName: 'Authorization'
    }
```

</details>

<!-- suggestion_end -->

<details>
<summary>🧰 Tools</summary>

<details>
<summary>🪛 Biome (1.9.4)</summary>

[error] 97-100: This property value named auth is later overwritten by an object member with the same name.

Overwritten with this value.

If an object property with the same name is defined multiple times (except when combining a getter with a setter), only the last definition makes it into the object and previous definitions are ignored.
Unsafe fix: Remove this property value named auth


(lint/suspicious/noDuplicateObjectKeys)

</details>

</details>

<details>
<summary>🤖 Prompt for AI Agents</summary>

```
In src/rate_limits.js between lines 97 and 122, there are two identical `auth`
properties defined, causing the first to be overwritten and leading to
inconsistent authentication configuration. Remove the duplicate `auth` property
so that only one definition remains, ensuring the authentication settings are
consistent and not overwritten.
```

</details>

<!-- This is an auto-generated comment by CodeRabbit -->
created_at: 2025-05-31T03:10:37Z
author_association: NONE
diff_hunk: @@ -540,9 +814,201 @@ function getRecommendedTier(provider, requirements) {
   return tiers[tiers.length - 1] || 'unknown'; // Return highest tier if none meet requirements
 }
 
+/**
+ * Get authentication headers for a provider
+ * @param {string} provider - Provider name
+ * @param {string} apiKey - API key
+ * @returns {Object} - Authentication headers
+ */
+function getAuthHeaders(provider, apiKey) {
+  const config = PROVIDER_RATE_LIMITS[provider];
+  if (!config) {
+    throw new Error(`Unsupported provider: ${provider}`);
+  }
+
+  // Use provider-specific auth config or fall back to defaults
+  const authConfig = config.auth || {
+    type: 'api-key',
+    headerName: 'x-api-key'
+  };
+
+  const headers = {
+    'Content-Type': 'application/json'
+  };
+
+  if (authConfig.type === 'bearer') {
+    headers[authConfig.headerName] = `Bearer ${apiKey}`;
+  } else {
+    headers[authConfig.headerName] = apiKey;
+  }
+
+  return headers;
+}
+
 // Create a global rate limit tracker instance
 const globalRateLimitTracker = new RateLimitTracker();
 
+/**
+ * Fetches current rate limit information from provider API endpoints
+ * @param {string} provider - Provider name (e.g., 'openai', 'anthropic')
+ * @param {string} apiKey - API key for authentication
+ * @returns {Promise<Object>} Current rate limit status
+ */
+async function fetchCurrentRateLimits(provider, apiKey) {
+  const config = PROVIDER_RATE_LIMITS[provider];
+  if (!config) {
+    throw new Error(`Unsupported provider: ${provider}`);
+  }
+
+  if (!apiKey) {
+    throw new Error(`API key required for ${provider}`);
+  }
+
+  const result = {
+    provider,
+    timestamp: new Date().toISOString(),
+    limits: {},
+    usage: {},
+    remaining: {},
+    errors: []
+  };
+
+  try {
+    // Try rate limit endpoint first
+    if (config.rateLimitEndpoint) {
+      try {
+        const headers = getAuthHeaders(provider, apiKey);
+        
+        const response = await fetch(config.rateLimitEndpoint, {
+          headers: headers
+        });
+
+        if (response.ok) {
+          const data = await response.json();
+          
+          // Parse rate limit headers if present
+          if (config.rateLimitHeaders) {
+            const rateLimitHeaders = parseRateLimitHeaders(response.headers, provider);
+            if (rateLimitHeaders) {
+              result.limits = rateLimitHeaders.limits;
+              result.remaining = rateLimitHeaders.remaining;
+              result.usage = rateLimitHeaders.usage;
+            }
+          }
+
+          // Store raw API response
+          result.apiResponse = data;
+        } else {
+          result.errors.push(`Rate limit endpoint returned ${response.status}: ${response.statusText}`);
+        }
+      } catch (error) {
+        result.errors.push(`Rate limit endpoint error: ${error.message}`);
+      }
+    }
+
+    // Try quota endpoint if available
+    if (config.quotaEndpoint) {
+      try {
+        const headers = getAuthHeaders(provider, apiKey);
+        
+        const quotaResponse = await fetch(config.quotaEndpoint, {
+          headers: headers
+        });
+
+        if (quotaResponse.ok) {
+          const data = await quotaResponse.json();
+          result.quotaInfo = data;
+        } else {
+          result.errors.push(`Quota endpoint returned ${quotaResponse.status}: ${quotaResponse.statusText}`);
+        }
+      } catch (error) {
+        result.errors.push(`Quota endpoint error: ${error.message}`);
+      }
+    }
+
+    // If no live data available, fall back to static configuration
+    if (Object.keys(result.limits).length === 0 && Object.keys(result.usage).length === 0) {
+      result.fallbackToStatic = true;
+      result.staticLimits = config;
+      result.errors.push('No live rate limit data available, using static configuration');
+    }
+
+  } catch (error) {
+    result.errors.push(`General error: ${error.message}`);
+    result.fallbackToStatic = true;
+    result.staticLimits = config;
+  }
+
+  return result;
+}
+
+/**
+ * Monitors rate limits in real-time by making a test request
+ * @param {string} provider - Provider name
+ * @param {string} apiKey - API key for authentication  
+ * @param {Object} options - Request options
+ * @returns {Promise<Object>} Rate limit information from response headers
+ */
+async function monitorRateLimitsViaTestRequest(provider, apiKey, options = {}) {
+  const config = PROVIDER_RATE_LIMITS[provider];
+  if (!config || !config.rateLimitHeaders) {
+    throw new Error(`Rate limit monitoring not supported for provider: ${provider}`);
+  }
+
+  const testEndpoints = {
+    openai: 'https://api.openai.com/v1/models',
+    anthropic: 'https://api.anthropic.com/v1/messages',
+    google: 'https://generativelanguage.googleapis.com/v1beta/models',
+    groq: 'https://api.groq.com/openai/v1/models',
+    together: 'https://api.together.xyz/v1/models',
+    openrouter: 'https://openrouter.ai/api/v1/models'
+  };
+
+  const endpoint = testEndpoints[provider];
+  if (!endpoint) {
+    throw new Error(`No test endpoint configured for provider: ${provider}`);
+  }
+
+  try {
+    const headers = {
+      'Content-Type': 'application/json'
+    };
+
+    // Add provider-specific authentication
+    if (provider === 'openai' || provider === 'google') {
+      headers['Authorization'] = `Bearer ${apiKey}`;
+    } else {
+      headers['x-api-key'] = apiKey;
+    }
+
+    const response = await fetch(endpoint, {
+      method: 'GET',
+      headers
+    });
path: src/rate_limits.js
user: login: coderabbitai[bot]
body: _🛠️ Refactor suggestion_

**Use getAuthHeaders helper for consistent authentication.**

The hardcoded authentication logic here is inconsistent with the `fetchCurrentRateLimits` function. Use the `getAuthHeaders` helper for better maintainability.



```diff
-    const headers = {
-      'Content-Type': 'application/json'
-    };
-
-    // Add provider-specific authentication
-    if (provider === 'openai' || provider === 'google') {
-      headers['Authorization'] = `Bearer ${apiKey}`;
-    } else {
-      headers['x-api-key'] = apiKey;
-    }
+    const headers = getAuthHeaders(provider, apiKey);
```


<!-- suggestion_start -->

<details>
<summary>📝 Committable suggestion</summary>

> ‼️ **IMPORTANT**
> Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

```suggestion
  try {
    const headers = getAuthHeaders(provider, apiKey);

    const response = await fetch(endpoint, {
      method: 'GET',
      headers
    });
```

</details>

<!-- suggestion_end -->

<details>
<summary>🤖 Prompt for AI Agents</summary>

```
In src/rate_limits.js around lines 972 to 987, replace the manual construction
of the headers object and the conditional authentication logic with a call to
the existing getAuthHeaders helper function to obtain the appropriate
authentication headers. This ensures consistent and maintainable authentication
handling across the codebase.
```

</details>

<!-- This is an auto-generated comment by CodeRabbit -->
created_at: 2025-05-31T03:10:37Z
author_association: NONE
diff_hunk: @@ -163,39 +281,106 @@ const PROVIDER_RATE_LIMITS = {
       [RATE_LIMIT_TYPES.RPM]: 3000,
       [RATE_LIMIT_TYPES.TPM]: 500000
     },
+    // Real-time detection via API headers
+    rateLimitHeaders: {
+      remaining: 'x-ratelimit-remaining',
+      reset: 'x-ratelimit-reset',
+      retryAfter: 'retry-after'
+    },
+    errorPatterns: {
+      rateLimitExceeded: /Rate limit exceeded/
+    },
+    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
     documentation: 'https://docs.together.ai/docs/rate-limits',
-    headers: ['x-ratelimit-remaining', 'x-ratelimit-reset']
+    auth: {
+      type: 'bearer',
+      headerName: 'Authorization'
+    },
+    auth: {
+      type: 'bearer',
+      headerName: 'Authorization'
+    }
   },
 
-  // OpenRouter rate limits (from official docs)
+  // OpenRouter rate limits - Models verified via API calls
+  // NOTE: Rate limit values below are from documentation research, NOT from API calls
+  // API endpoint accessibility: VERIFIED - Models endpoint accessible, found 322 models (collected_info/all_providers_2025-05-30.json)
+  // Pricing and documentation endpoints: NOT TESTED in collected_info
   openrouter: {
     free: {
-      [RATE_LIMIT_TYPES.RPM]: 20, // For :free models
-      [RATE_LIMIT_TYPES.RPD]: 50  // For users with <$10 credits
+      [RATE_LIMIT_TYPES.RPM]: 20,
+      [RATE_LIMIT_TYPES.RPD]: 50,
+      notes: "For :free models and <$10 credits"
     },
     paid: {
       [RATE_LIMIT_TYPES.RPM]: null, // Model-dependent
-      [RATE_LIMIT_TYPES.RPD]: 1000  // For users with >=$10 credits
+      [RATE_LIMIT_TYPES.RPD]: 1000,
+      notes: "For >=$10 credits"
     },
+    // Real-time detection via API headers
+    rateLimitHeaders: {
+      limit: 'x-ratelimit-limit',
+      remaining: 'x-ratelimit-remaining',
+      reset: 'x-ratelimit-reset',
+      retryAfter: 'retry-after'
+    },
+    errorPatterns: {
+      rateLimitExceeded: /Rate limit exceeded/,
+      quotaExceeded: /Insufficient credits/
+    },
+    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
     documentation: 'https://openrouter.ai/docs/limits',
-    headers: ['x-ratelimit-limit', 'x-ratelimit-remaining', 'x-ratelimit-reset']
+    auth: {
+      type: 'bearer',
+      headerName: 'Authorization'
+    },
+    auth: {
+      type: 'bearer',
+      headerName: 'Authorization'
+    }
   },
 
-  // GitHub Models rate limits (from GitHub REST API docs)
+  // GitHub Models rate limits - Models and endpoint accessibility verified
+  // NOTE: Rate limit values below are from documentation research, NOT from API calls
+  // API endpoint accessibility: VERIFIED - Models endpoint accessible, found 24 models (collected_info/all_providers_2025-05-30.json)
+  // Multiple endpoints accessible (2 out of 3 in collected_info)
   'gh-models': {
     free: {
-      [RATE_LIMIT_TYPES.RPM]: 60, // Unauthenticated
-      [RATE_LIMIT_TYPES.RPD]: null
+      [RATE_LIMIT_TYPES.RPM]: 60,
+      [RATE_LIMIT_TYPES.RPD]: null,
+      notes: "Unauthenticated requests"
     },
     authenticated: {
-      [RATE_LIMIT_TYPES.RPM]: 5000, // With personal access token
-      [RATE_LIMIT_TYPES.RPD]: null
+      [RATE_LIMIT_TYPES.RPM]: 5000,
+      [RATE_LIMIT_TYPES.RPD]: null,
+      notes: "With personal access token"
+    },
+    // Real-time detection via API headers
+    rateLimitHeaders: {
+      limit: 'x-ratelimit-limit',
+      remaining: 'x-ratelimit-remaining', 
+      reset: 'x-ratelimit-reset',
+      retryAfter: 'retry-after'
+    },
+    errorPatterns: {
+      rateLimitExceeded: /API rate limit exceeded/
     },
+    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
     documentation: 'https://docs.github.com/en/rest/using-the-rest-api/rate-limits-for-the-rest-api',
-    headers: ['x-ratelimit-limit', 'x-ratelimit-remaining', 'x-ratelimit-reset']
+    auth: {
+      type: 'bearer',
+      headerName: 'Authorization'
+    },
+    auth: {
+      type: 'api-key',
+      headerName: 'x-api-key'
+    }
   },
path: src/rate_limits.js
user: login: coderabbitai[bot]
body: _⚠️ Potential issue_

**Fix duplicate `auth` property in GitHub Models configuration.**

The `auth` property is defined twice, causing the first definition to be overwritten.



```diff
-    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
-    documentation: 'https://docs.github.com/en/rest/using-the-rest-api/rate-limits-for-the-rest-api',
-    auth: {
-      type: 'bearer',
-      headerName: 'Authorization'
-    },
+    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
+    documentation: 'https://docs.github.com/en/rest/using-the-rest-api/rate-limits-for-the-rest-api',
     auth: {
       type: 'api-key',
       headerName: 'x-api-key'
     }
```


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<summary>📝 Committable suggestion</summary>

> ‼️ **IMPORTANT**
> Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

```suggestion
    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
    documentation: 'https://docs.github.com/en/rest/using-the-rest-api/rate-limits-for-the-rest-api',
    auth: {
      type: 'api-key',
      headerName: 'x-api-key'
    }
  },
```

</details>

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<details>
<summary>🧰 Tools</summary>

<details>
<summary>🪛 Biome (1.9.4)</summary>

[error] 370-373: This property value named auth is later overwritten by an object member with the same name.

Overwritten with this value.

If an object property with the same name is defined multiple times (except when combining a getter with a setter), only the last definition makes it into the object and previous definitions are ignored.
Unsafe fix: Remove this property value named auth


(lint/suspicious/noDuplicateObjectKeys)

</details>

</details>

<details>
<summary>🤖 Prompt for AI Agents</summary>

```
In src/rate_limits.js around lines 370 to 378, there are two `auth` properties
defined in the same object, causing the first one to be overwritten. To fix
this, combine the two `auth` configurations into a single property or rename one
of them to avoid duplication, ensuring both authentication methods are preserved
without conflict.
```

</details>

<!-- This is an auto-generated comment by CodeRabbit -->
created_at: 2025-05-31T03:10:37Z
author_association: NONE
diff_hunk: @@ -91,61 +136,134 @@ const PROVIDER_RATE_LIMITS = {
         "claude-3.5-sonnet": 20000
       },
       [RATE_LIMIT_TYPES.TPD]: 300000,
-      notes: "Limits apply to all Claude 3 models with slight TPM variation by model"
+      notes: "Standard tier, varies by model"
     },
     enterprise: {
       [RATE_LIMIT_TYPES.RPM]: 50,
       [RATE_LIMIT_TYPES.TPM]: 100000,
       [RATE_LIMIT_TYPES.TPD]: 3000000,
-      notes: "Custom enterprise tier with higher limits"
+      notes: "Enterprise tier with higher limits"
+    },
+    // Real-time detection via API headers
+    rateLimitHeaders: {
+      requestsRemaining: 'anthropic-ratelimit-requests-remaining',
+      tokensRemaining: 'anthropic-ratelimit-tokens-remaining',
+      requestsReset: 'anthropic-ratelimit-requests-reset',
+      tokensReset: 'anthropic-ratelimit-tokens-reset',
+      retryAfter: 'retry-after'
     },
+    // Live rate limit endpoints
+    rateLimitEndpoint: 'https://api.anthropic.com/v1/usage',
+    quotaEndpoint: 'https://api.anthropic.com/v1/billing/subscription',
+    // Extract from 429 error responses  
+    errorPatterns: {
+      rateLimitExceeded: /rate_limit_error/,
+      quotaExceeded: /Your credit balance is too low/
+    },
+    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
     documentation: 'https://docs.anthropic.com/en/api/rate-limits',
-    headers: ['anthropic-ratelimit-requests-remaining', 'anthropic-ratelimit-tokens-remaining']
+    auth: {
+      type: 'api-key',
+      headerName: 'x-api-key'
+    },
+    auth: {
+      type: 'bearer',
+      headerName: 'Authorization'
+    }
   },
 
-  // Google Gemini rate limits (estimated - official detailed limits not publicly released)
+  // Google Gemini rate limits - Documentation endpoint accessible
+  // NOTE: Rate limit values below are from documentation research, NOT from API calls
+  // API endpoint accessibility: VERIFIED - Documentation endpoint accessible (200 status in collected_info)
+  // Models endpoint: BLOCKED (403 error in collected_info)
+  // Pricing endpoint: BLOCKED (301 redirect in collected_info)
   google: {
-    preview: {
+    free: {
       [RATE_LIMIT_TYPES.RPM]: 15,
-      [RATE_LIMIT_TYPES.TPM]: 250000,
+      [RATE_LIMIT_TYPES.TPM]: 32000,
       [RATE_LIMIT_TYPES.RPD]: 1500,
-      notes: "Preview estimates - detailed rate limits not publicly released"
+      notes: "Free tier limits"
     },
-    tier1: {
+    paid: {
       [RATE_LIMIT_TYPES.RPM]: 2000,
       [RATE_LIMIT_TYPES.TPM]: 4000000,
-      [RATE_LIMIT_TYPES.RPD]: null, // No daily limit specified
-      notes: "Estimated values - refer to official documentation for confirmation"
-    },
-    tier2: {
-      [RATE_LIMIT_TYPES.RPM]: 10000,
-      [RATE_LIMIT_TYPES.TPM]: 4000000,
       [RATE_LIMIT_TYPES.RPD]: null,
-      notes: "Estimated values - refer to official documentation for confirmation"
+      notes: "Paid tier limits"
+    },
+    // Real-time detection via API headers
+    rateLimitHeaders: {
+      quotaUser: 'x-goog-quota-user',
+      apiQuotaUser: 'x-goog-api-quota-user',
+      rateLimitRemaining: 'x-goog-ratelimit-remaining',
+      rateLimitReset: 'x-goog-ratelimit-reset'
     },
+    // Live rate limit endpoints
+    rateLimitEndpoint: 'https://generativelanguage.googleapis.com/v1beta/models:countTokens',
+    quotaEndpoint: 'https://generativelanguage.googleapis.com/v1beta/models',
+    // Current quota endpoint
+    modelQuotaEndpoint: '/v1beta/models:quota',
+    // Extract from 429 error responses
+    errorPatterns: {
+      quotaExceeded: /Quota exceeded/,
+      rateLimitExceeded: /Rate limit exceeded/
+    },
+    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
     documentation: 'https://ai.google.dev/gemini-api/docs/quota',
-    headers: ['x-goog-quota-user', 'x-goog-api-quota-user']
+    auth: {
+      type: 'bearer',
+      headerName: 'Authorization'
+    },
+    auth: {
+      type: 'bearer',
+      headerName: 'Authorization'
+    }
   },
path: src/rate_limits.js
user: login: coderabbitai[bot]
body: _⚠️ Potential issue_

**Fix duplicate `auth` property in Google configuration.**

The `auth` property is defined twice, causing the first definition to be overwritten.



```diff
-    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
-    documentation: 'https://ai.google.dev/gemini-api/docs/quota',
-    auth: {
-      type: 'bearer',
-      headerName: 'Authorization'
-    },
+    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
+    documentation: 'https://ai.google.dev/gemini-api/docs/quota',
     auth: {
       type: 'bearer',
       headerName: 'Authorization'
     }
```


> Committable suggestion skipped: line range outside the PR's diff.

<details>
<summary>🧰 Tools</summary>

<details>
<summary>🪛 Biome (1.9.4)</summary>

[error] 212-215: This property value named auth is later overwritten by an object member with the same name.

Overwritten with this value.

If an object property with the same name is defined multiple times (except when combining a getter with a setter), only the last definition makes it into the object and previous definitions are ignored.
Unsafe fix: Remove this property value named auth


(lint/suspicious/noDuplicateObjectKeys)

</details>

</details>

<details>
<summary>🤖 Prompt for AI Agents</summary>

```
In src/rate_limits.js around lines 212 to 220, there are two duplicate `auth`
properties defined in the Google configuration object. Remove one of the
duplicate `auth` property definitions so that only a single `auth` property
remains, preventing the first from being overwritten.
```

</details>

<!-- This is an auto-generated comment by CodeRabbit -->
created_at: 2025-05-31T03:10:38Z
author_association: NONE
diff_hunk: @@ -163,39 +281,106 @@ const PROVIDER_RATE_LIMITS = {
       [RATE_LIMIT_TYPES.RPM]: 3000,
       [RATE_LIMIT_TYPES.TPM]: 500000
     },
+    // Real-time detection via API headers
+    rateLimitHeaders: {
+      remaining: 'x-ratelimit-remaining',
+      reset: 'x-ratelimit-reset',
+      retryAfter: 'retry-after'
+    },
+    errorPatterns: {
+      rateLimitExceeded: /Rate limit exceeded/
+    },
+    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
     documentation: 'https://docs.together.ai/docs/rate-limits',
-    headers: ['x-ratelimit-remaining', 'x-ratelimit-reset']
+    auth: {
+      type: 'bearer',
+      headerName: 'Authorization'
+    },
+    auth: {
+      type: 'bearer',
+      headerName: 'Authorization'
+    }
   },
path: src/rate_limits.js
user: login: coderabbitai[bot]
body: _⚠️ Potential issue_

**Fix duplicate `auth` property in Together AI configuration.**

The `auth` property is defined twice, causing the first definition to be overwritten.



```diff
-    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
-    documentation: 'https://docs.together.ai/docs/rate-limits',
-    auth: {
-      type: 'bearer',
-      headerName: 'Authorization'
-    },
+    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
+    documentation: 'https://docs.together.ai/docs/rate-limits',
     auth: {
       type: 'bearer',
       headerName: 'Authorization'
     }
```


<!-- suggestion_start -->

<details>
<summary>📝 Committable suggestion</summary>

> ‼️ **IMPORTANT**
> Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

```suggestion
    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
    documentation: 'https://docs.together.ai/docs/rate-limits',
    auth: {
      type: 'bearer',
      headerName: 'Authorization'
    }
  },
```

</details>

<!-- suggestion_end -->

<details>
<summary>🧰 Tools</summary>

<details>
<summary>🪛 Biome (1.9.4)</summary>

[error] 295-298: This property value named auth is later overwritten by an object member with the same name.

Overwritten with this value.

If an object property with the same name is defined multiple times (except when combining a getter with a setter), only the last definition makes it into the object and previous definitions are ignored.
Unsafe fix: Remove this property value named auth


(lint/suspicious/noDuplicateObjectKeys)

</details>

</details>

<details>
<summary>🤖 Prompt for AI Agents</summary>

```
In src/rate_limits.js between lines 295 and 303, there are two duplicate `auth`
properties defined in the Together AI configuration object. Remove one of the
duplicate `auth` property definitions to ensure only a single `auth`
configuration exists, preventing the first from being overwritten.
```

</details>

<!-- This is an auto-generated comment by CodeRabbit -->
created_at: 2025-05-31T03:10:38Z
author_association: NONE
diff_hunk: @@ -163,39 +281,106 @@ const PROVIDER_RATE_LIMITS = {
       [RATE_LIMIT_TYPES.RPM]: 3000,
       [RATE_LIMIT_TYPES.TPM]: 500000
     },
+    // Real-time detection via API headers
+    rateLimitHeaders: {
+      remaining: 'x-ratelimit-remaining',
+      reset: 'x-ratelimit-reset',
+      retryAfter: 'retry-after'
+    },
+    errorPatterns: {
+      rateLimitExceeded: /Rate limit exceeded/
+    },
+    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
     documentation: 'https://docs.together.ai/docs/rate-limits',
-    headers: ['x-ratelimit-remaining', 'x-ratelimit-reset']
+    auth: {
+      type: 'bearer',
+      headerName: 'Authorization'
+    },
+    auth: {
+      type: 'bearer',
+      headerName: 'Authorization'
+    }
   },
 
-  // OpenRouter rate limits (from official docs)
+  // OpenRouter rate limits - Models verified via API calls
+  // NOTE: Rate limit values below are from documentation research, NOT from API calls
+  // API endpoint accessibility: VERIFIED - Models endpoint accessible, found 322 models (collected_info/all_providers_2025-05-30.json)
+  // Pricing and documentation endpoints: NOT TESTED in collected_info
   openrouter: {
     free: {
-      [RATE_LIMIT_TYPES.RPM]: 20, // For :free models
-      [RATE_LIMIT_TYPES.RPD]: 50  // For users with <$10 credits
+      [RATE_LIMIT_TYPES.RPM]: 20,
+      [RATE_LIMIT_TYPES.RPD]: 50,
+      notes: "For :free models and <$10 credits"
     },
     paid: {
       [RATE_LIMIT_TYPES.RPM]: null, // Model-dependent
-      [RATE_LIMIT_TYPES.RPD]: 1000  // For users with >=$10 credits
+      [RATE_LIMIT_TYPES.RPD]: 1000,
+      notes: "For >=$10 credits"
     },
+    // Real-time detection via API headers
+    rateLimitHeaders: {
+      limit: 'x-ratelimit-limit',
+      remaining: 'x-ratelimit-remaining',
+      reset: 'x-ratelimit-reset',
+      retryAfter: 'retry-after'
+    },
+    errorPatterns: {
+      rateLimitExceeded: /Rate limit exceeded/,
+      quotaExceeded: /Insufficient credits/
+    },
+    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
     documentation: 'https://openrouter.ai/docs/limits',
-    headers: ['x-ratelimit-limit', 'x-ratelimit-remaining', 'x-ratelimit-reset']
+    auth: {
+      type: 'bearer',
+      headerName: 'Authorization'
+    },
+    auth: {
+      type: 'bearer',
+      headerName: 'Authorization'
+    }
   },
path: src/rate_limits.js
user: login: coderabbitai[bot]
body: _⚠️ Potential issue_

**Fix duplicate `auth` property in OpenRouter configuration.**

The `auth` property is defined twice, causing the first definition to be overwritten.



```diff
-    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
-    documentation: 'https://openrouter.ai/docs/limits',
-    auth: {
-      type: 'bearer',
-      headerName: 'Authorization'
-    },
+    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
+    documentation: 'https://openrouter.ai/docs/limits',
     auth: {
       type: 'bearer',
       headerName: 'Authorization'
     }
```


<!-- suggestion_start -->

<details>
<summary>📝 Committable suggestion</summary>

> ‼️ **IMPORTANT**
> Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

```suggestion
    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
    documentation: 'https://openrouter.ai/docs/limits',
    auth: {
      type: 'bearer',
      headerName: 'Authorization'
    }
  },
```

</details>

<!-- suggestion_end -->

<details>
<summary>🧰 Tools</summary>

<details>
<summary>🪛 Biome (1.9.4)</summary>

[error] 333-336: This property value named auth is later overwritten by an object member with the same name.

Overwritten with this value.

If an object property with the same name is defined multiple times (except when combining a getter with a setter), only the last definition makes it into the object and previous definitions are ignored.
Unsafe fix: Remove this property value named auth


(lint/suspicious/noDuplicateObjectKeys)

</details>

</details>

<details>
<summary>🤖 Prompt for AI Agents</summary>

```
In src/rate_limits.js around lines 333 to 341, there are two duplicate `auth`
properties defined in the same object, which causes the first one to be
overwritten. Remove the redundant `auth` property so that only a single `auth`
definition remains with the correct configuration.
```

</details>

<!-- This is an auto-generated comment by CodeRabbit -->
created_at: 2025-05-31T03:10:38Z
author_association: NONE
diff_hunk: @@ -91,61 +136,134 @@ const PROVIDER_RATE_LIMITS = {
         "claude-3.5-sonnet": 20000
       },
       [RATE_LIMIT_TYPES.TPD]: 300000,
-      notes: "Limits apply to all Claude 3 models with slight TPM variation by model"
+      notes: "Standard tier, varies by model"
     },
     enterprise: {
       [RATE_LIMIT_TYPES.RPM]: 50,
       [RATE_LIMIT_TYPES.TPM]: 100000,
       [RATE_LIMIT_TYPES.TPD]: 3000000,
-      notes: "Custom enterprise tier with higher limits"
+      notes: "Enterprise tier with higher limits"
+    },
+    // Real-time detection via API headers
+    rateLimitHeaders: {
+      requestsRemaining: 'anthropic-ratelimit-requests-remaining',
+      tokensRemaining: 'anthropic-ratelimit-tokens-remaining',
+      requestsReset: 'anthropic-ratelimit-requests-reset',
+      tokensReset: 'anthropic-ratelimit-tokens-reset',
+      retryAfter: 'retry-after'
     },
+    // Live rate limit endpoints
+    rateLimitEndpoint: 'https://api.anthropic.com/v1/usage',
+    quotaEndpoint: 'https://api.anthropic.com/v1/billing/subscription',
+    // Extract from 429 error responses  
+    errorPatterns: {
+      rateLimitExceeded: /rate_limit_error/,
+      quotaExceeded: /Your credit balance is too low/
+    },
+    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
     documentation: 'https://docs.anthropic.com/en/api/rate-limits',
-    headers: ['anthropic-ratelimit-requests-remaining', 'anthropic-ratelimit-tokens-remaining']
+    auth: {
+      type: 'api-key',
+      headerName: 'x-api-key'
+    },
+    auth: {
+      type: 'bearer',
+      headerName: 'Authorization'
+    }
   },
path: src/rate_limits.js
user: login: coderabbitai[bot]
body: _⚠️ Potential issue_

**Fix duplicate `auth` property.**

Similar to OpenAI, the `auth` property is defined twice, with the second definition overwriting the first.



```diff
-    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
-    documentation: 'https://docs.anthropic.com/en/api/rate-limits',
-    auth: {
-      type: 'api-key',
-      headerName: 'x-api-key'
-    },
+    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
+    documentation: 'https://docs.anthropic.com/en/api/rate-limits',
     auth: {
       type: 'bearer',
       headerName: 'Authorization'
     }
```


<!-- suggestion_start -->

<details>
<summary>📝 Committable suggestion</summary>

> ‼️ **IMPORTANT**
> Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

```suggestion
    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
    documentation: 'https://docs.anthropic.com/en/api/rate-limits',
    auth: {
      type: 'bearer',
      headerName: 'Authorization'
    }
```

</details>

<!-- suggestion_end -->

<details>
<summary>🧰 Tools</summary>

<details>
<summary>🪛 Biome (1.9.4)</summary>

[error] 165-168: This property value named auth is later overwritten by an object member with the same name.

Overwritten with this value.

If an object property with the same name is defined multiple times (except when combining a getter with a setter), only the last definition makes it into the object and previous definitions are ignored.
Unsafe fix: Remove this property value named auth


(lint/suspicious/noDuplicateObjectKeys)

</details>

</details>

<details>
<summary>🤖 Prompt for AI Agents</summary>

```
In src/rate_limits.js between lines 165 and 173, there are two `auth` properties
defined in the same object, causing the first to be overwritten. Combine the two
`auth` configurations into a single property or restructure the object to avoid
duplicate keys, ensuring both authentication methods are preserved without
overwriting.
```

</details>

<!-- This is an auto-generated comment by CodeRabbit -->
created_at: 2025-05-31T03:10:38Z
author_association: NONE
diff_hunk: @@ -91,61 +136,134 @@ const PROVIDER_RATE_LIMITS = {
         "claude-3.5-sonnet": 20000
       },
       [RATE_LIMIT_TYPES.TPD]: 300000,
-      notes: "Limits apply to all Claude 3 models with slight TPM variation by model"
+      notes: "Standard tier, varies by model"
     },
     enterprise: {
       [RATE_LIMIT_TYPES.RPM]: 50,
       [RATE_LIMIT_TYPES.TPM]: 100000,
       [RATE_LIMIT_TYPES.TPD]: 3000000,
-      notes: "Custom enterprise tier with higher limits"
+      notes: "Enterprise tier with higher limits"
+    },
+    // Real-time detection via API headers
+    rateLimitHeaders: {
+      requestsRemaining: 'anthropic-ratelimit-requests-remaining',
+      tokensRemaining: 'anthropic-ratelimit-tokens-remaining',
+      requestsReset: 'anthropic-ratelimit-requests-reset',
+      tokensReset: 'anthropic-ratelimit-tokens-reset',
+      retryAfter: 'retry-after'
     },
+    // Live rate limit endpoints
+    rateLimitEndpoint: 'https://api.anthropic.com/v1/usage',
+    quotaEndpoint: 'https://api.anthropic.com/v1/billing/subscription',
+    // Extract from 429 error responses  
+    errorPatterns: {
+      rateLimitExceeded: /rate_limit_error/,
+      quotaExceeded: /Your credit balance is too low/
+    },
+    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
     documentation: 'https://docs.anthropic.com/en/api/rate-limits',
-    headers: ['anthropic-ratelimit-requests-remaining', 'anthropic-ratelimit-tokens-remaining']
+    auth: {
+      type: 'api-key',
+      headerName: 'x-api-key'
+    },
+    auth: {
+      type: 'bearer',
+      headerName: 'Authorization'
+    }
   },
 
-  // Google Gemini rate limits (estimated - official detailed limits not publicly released)
+  // Google Gemini rate limits - Documentation endpoint accessible
+  // NOTE: Rate limit values below are from documentation research, NOT from API calls
+  // API endpoint accessibility: VERIFIED - Documentation endpoint accessible (200 status in collected_info)
+  // Models endpoint: BLOCKED (403 error in collected_info)
+  // Pricing endpoint: BLOCKED (301 redirect in collected_info)
   google: {
-    preview: {
+    free: {
       [RATE_LIMIT_TYPES.RPM]: 15,
-      [RATE_LIMIT_TYPES.TPM]: 250000,
+      [RATE_LIMIT_TYPES.TPM]: 32000,
       [RATE_LIMIT_TYPES.RPD]: 1500,
-      notes: "Preview estimates - detailed rate limits not publicly released"
+      notes: "Free tier limits"
     },
-    tier1: {
+    paid: {
       [RATE_LIMIT_TYPES.RPM]: 2000,
       [RATE_LIMIT_TYPES.TPM]: 4000000,
-      [RATE_LIMIT_TYPES.RPD]: null, // No daily limit specified
-      notes: "Estimated values - refer to official documentation for confirmation"
-    },
-    tier2: {
-      [RATE_LIMIT_TYPES.RPM]: 10000,
-      [RATE_LIMIT_TYPES.TPM]: 4000000,
       [RATE_LIMIT_TYPES.RPD]: null,
-      notes: "Estimated values - refer to official documentation for confirmation"
+      notes: "Paid tier limits"
+    },
+    // Real-time detection via API headers
+    rateLimitHeaders: {
+      quotaUser: 'x-goog-quota-user',
+      apiQuotaUser: 'x-goog-api-quota-user',
+      rateLimitRemaining: 'x-goog-ratelimit-remaining',
+      rateLimitReset: 'x-goog-ratelimit-reset'
     },
+    // Live rate limit endpoints
+    rateLimitEndpoint: 'https://generativelanguage.googleapis.com/v1beta/models:countTokens',
+    quotaEndpoint: 'https://generativelanguage.googleapis.com/v1beta/models',
+    // Current quota endpoint
+    modelQuotaEndpoint: '/v1beta/models:quota',
+    // Extract from 429 error responses
+    errorPatterns: {
+      quotaExceeded: /Quota exceeded/,
+      rateLimitExceeded: /Rate limit exceeded/
+    },
+    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
     documentation: 'https://ai.google.dev/gemini-api/docs/quota',
-    headers: ['x-goog-quota-user', 'x-goog-api-quota-user']
+    auth: {
+      type: 'bearer',
+      headerName: 'Authorization'
+    },
+    auth: {
+      type: 'bearer',
+      headerName: 'Authorization'
+    }
   },
 
-  // Groq rate limits (from official docs)
+  // Groq rate limits - Pricing and documentation endpoints accessible
+  // NOTE: Rate limit values below are from documentation research, NOT from API calls
+  // API endpoint accessibility: VERIFIED - Pricing (200) and documentation (200) endpoints accessible (collected_info)
+  // Models endpoint: BLOCKED (401 - requires auth key in collected_info)
   groq: {
     free: {
       [RATE_LIMIT_TYPES.RPM]: 30,
       [RATE_LIMIT_TYPES.TPM]: 6000,
       [RATE_LIMIT_TYPES.RPD]: 14400,
-      [RATE_LIMIT_TYPES.ASH]: 3600 // 1 hour of audio per hour
+      [RATE_LIMIT_TYPES.ASH]: 3600
     },
     paid: {
       [RATE_LIMIT_TYPES.RPM]: 6000,
       [RATE_LIMIT_TYPES.TPM]: 600000,
       [RATE_LIMIT_TYPES.RPD]: 14400,
-      [RATE_LIMIT_TYPES.ASH]: 54000 // 15 hours per hour
+      [RATE_LIMIT_TYPES.ASH]: 54000
+    },
+    // Real-time detection via API headers
+    rateLimitHeaders: {
+      limit: 'x-ratelimit-limit-requests',
+      remaining: 'x-ratelimit-remaining-requests',
+      reset: 'x-ratelimit-reset-requests',
+      retryAfter: 'retry-after'
     },
+    // Extract from 429 error responses
+    errorPatterns: {
+      rateLimitExceeded: /Rate limit exceeded/,
+      quotaExceeded: /Quota exceeded/
+    },
+    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
     documentation: 'https://console.groq.com/docs/rate-limits',
-    headers: ['x-ratelimit-limit-requests', 'x-ratelimit-remaining-requests', 'x-ratelimit-reset-requests', 'retry-after']
+    auth: {
+      type: 'bearer',
+      headerName: 'Authorization'
+    },
+    auth: {
+      type: 'bearer',
+      headerName: 'Authorization'
+    }
   },
path: src/rate_limits.js
user: login: coderabbitai[bot]
body: _⚠️ Potential issue_

**Fix duplicate `auth` property in Groq configuration.**

The `auth` property is defined twice, causing the first definition to be overwritten.



```diff
-    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
-    documentation: 'https://console.groq.com/docs/rate-limits',
-    auth: {
-      type: 'bearer',
-      headerName: 'Authorization'
-    },
+    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
+    documentation: 'https://console.groq.com/docs/rate-limits',
     auth: {
       type: 'bearer',
       headerName: 'Authorization'
     }
```


<!-- suggestion_start -->

<details>
<summary>📝 Committable suggestion</summary>

> ‼️ **IMPORTANT**
> Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

```suggestion
  Groq: {
    // Documentation URLs (WARNING: May become outdated - use API headers for real-time data)
    documentation: 'https://console.groq.com/docs/rate-limits',
    auth: {
      type: 'bearer',
      headerName: 'Authorization'
    }
  },
```

</details>

<!-- suggestion_end -->

<details>
<summary>🧰 Tools</summary>

<details>
<summary>🪛 Biome (1.9.4)</summary>

[error] 253-256: This property value named auth is later overwritten by an object member with the same name.

Overwritten with this value.

If an object property with the same name is defined multiple times (except when combining a getter with a setter), only the last definition makes it into the object and previous definitions are ignored.
Unsafe fix: Remove this property value named auth


(lint/suspicious/noDuplicateObjectKeys)

</details>

</details>

<details>
<summary>🤖 Prompt for AI Agents</summary>

```
In src/rate_limits.js around lines 253 to 261, there are two duplicate `auth`
properties defined in the same object, which causes the first one to be
overwritten. Remove the duplicate `auth` property so that only one `auth`
configuration remains, ensuring the object has a single unique `auth` key with
the correct settings.
```

</details>

<!-- This is an auto-generated comment by CodeRabbit -->
created_at: 2025-05-31T03:10:38Z
author_association: NONE

PR comments:
user: login: sourcery-ai[bot]
created_at: 2025-05-31T02:04:52Z
body: <!-- Generated by sourcery-ai[bot]: start review_guide -->

## Reviewer's Guide

This PR overhauls rate limit management by restructuring provider configurations for real-time detection, adding live-fetch and monitoring utilities, and introducing both pure-functional and class-based rate-limiting modules—accompanied by updated tests and documentation adjustments.

#### Sequence Diagram for `fetchCurrentRateLimits` Function

```mermaid
sequenceDiagram
  actor Client
  participant RateLimitModule
  participant ProviderAPI

  Client->>RateLimitModule: fetchCurrentRateLimits(provider, apiKey)
  RateLimitModule->>RateLimitModule: Get provider config from PROVIDER_RATE_LIMITS
  alt Has providerConfig.rateLimitEndpoint
    RateLimitModule->>ProviderAPI: GET config.rateLimitEndpoint (auth: apiKey)
    ProviderAPI-->>RateLimitModule: HTTP Response (data, headers)
    RateLimitModule->>RateLimitModule: Parse rateLimitHeaders from response
    RateLimitModule->>RateLimitModule: Store/Update limit/usage data from response data & headers
  end
  alt Has providerConfig.quotaEndpoint
    RateLimitModule->>ProviderAPI: GET config.quotaEndpoint (auth: apiKey)
    ProviderAPI-->>RateLimitModule: HTTP Response (quota data)
    RateLimitModule->>RateLimitModule: Store/Update quota info
  end
  alt No live data fetched or errors occurred
    RateLimitModule->>RateLimitModule: Fallback to static config values
    RateLimitModule->>RateLimitModule: Log "using static configuration" or error
  end
  RateLimitModule-->>Client: Aggregated rate limit status result
```

#### Sequence Diagram for `monitorRateLimitsViaTestRequest` Function

```mermaid
sequenceDiagram
  actor Client
  participant RateLimitModule
  participant ProviderTestAPI

  Client->>RateLimitModule: monitorRateLimitsViaTestRequest(provider, apiKey)
  RateLimitModule->>RateLimitModule: Get provider config & test endpoint URL
  alt Test endpoint configured for provider
    RateLimitModule->>ProviderTestAPI: GET test_endpoint_url (auth: apiKey)
    ProviderTestAPI-->>RateLimitModule: HTTP Response (status, headers)
    RateLimitModule->>RateLimitModule: rateLimitInfo = parseRateLimitHeaders(response.headers, providerConfig.rateLimitHeaders)
    RateLimitModule-->>Client: {provider, timestamp, endpoint, status, rateLimitInfo, headers}
  else No test endpoint configured
    RateLimitModule-->>Client: Error: Monitoring not supported or no test endpoint
  end
```

#### Class Diagram for New `RateLimitManager`

```mermaid
classDiagram
  class RateLimitManager {
    +config: Object
    +usage: UsageInfo
    +constructor(config: Object)
    +recordRequest(tokens: number): void
    +checkRateLimit(tokens: number): RateLimitCheckResult
    +cleanOldEntries(): void
    +parseRateLimitHeaders(headers: Object): Object
  }
  class UsageInfo {
    minute: number[]
    day: number[]
    tokens: TokenUsage
  }
  class TokenUsage {
    minute: number
    day: number
  }
  class RateLimitCheckResult {
    allowed: boolean
    waitTime: number
    reason: string
  }
  RateLimitManager --> UsageInfo : has
  UsageInfo --> TokenUsage : has
```

#### Data Structure Diagram for Provider Configuration within `PROVIDER_RATE_LIMITS`

```mermaid
classDiagram
  class ProviderRateLimitConfig {
    <<Configuration Element>>
    tiers: Map~string, TierInfo~
    documentation: string
    rateLimitHeaders: RateLimitHeaderKeys
    rateLimitEndpoint: string
    quotaEndpoint: string
    errorPatterns: ErrorPatterns
  }
  class TierInfo {
    RPM: number
    TPM: number
    RPD: number
    notes: string
    // ... other rate limit types like TPD, ASH
  }
  class RateLimitHeaderKeys {
    // Provider-specific keys mapping to actual header names
    requestsLimit: string
    requestsRemaining: string
    tokensLimit: string
    tokensRemaining: string
    requestsReset: string
    tokensReset: string
    retryAfter: string
    // ... other generic or specific keys like 'limit', 'remaining', 'reset'
  }
  class ErrorPatterns {
    rateLimitExceeded: string
    quotaExceeded: string
  }
  ProviderRateLimitConfig o-- "*" TierInfo : contains
  ProviderRateLimitConfig -- RateLimitHeaderKeys : defines
  ProviderRateLimitConfig -- ErrorPatterns : defines
```

### File-Level Changes

| Change | Details | Files |
| ------ | ------- | ----- |
| Rearchitected rate limit configuration and parsing | <ul><li>Restructured PROVIDER_RATE_LIMITS to nest rateLimitHeaders, endpoints, and errorPatterns</li><li>Prioritized detection methods (headers, endpoints, errors, fallback) in module comments</li><li>Updated parseRateLimitHeaders to reference rateLimitHeaders instead of flat headers</li></ul> | `src/rate_limits.js` |
| Added live rate limit utility functions | <ul><li>Implemented fetchCurrentRateLimits to call rate limit and quota endpoints with error handling</li><li>Implemented monitorRateLimitsViaTestRequest to issue test requests and parse headers</li><li>Exported new utilities alongside existing functions</li></ul> | `src/rate_limits.js` |
| Introduced pure functional rate limiting module | <ul><li>Created cleanState to purge expired entries and recalc tokens immutably</li><li>Created recordRequest to append requests into minute/day windows</li><li>Created checkRateLimit to enforce RPM and TPM limits with wait times</li></ul> | `src/utils/rate_limit_functions.js` |
| Created generic RateLimitManager class | <ul><li>Added constructor accepting config with limits and headers</li><li>Implemented recordRequest and checkRateLimit methods with window cleanup</li><li>Added header parsing via parseRateLimitHeaders method</li></ul> | `src/utils/rate_limit_manager.js` |
| Implemented exponential backoff and type utilities | <ul><li>Defined RATE_LIMIT_TYPES mapping for common limit keys</li><li>Added calculateBackoffDelay with exponential growth and jitter</li></ul> | `src/utils/rate_limit_utils.js` |
| Updated tests to align with new config structure | <ul><li>Excluded new config keys (rateLimitHeaders, rateLimitEndpoint, quotaEndpoint, errorPatterns) from test assertions</li></ul> | `src/rate_limits.test.js` |
| Revised documentation and instructions | <ul><li>Expanded FUTURE_TASKS.md with URL validation steps and user feedback actions</li><li>Refined `.github/copilot-instructions.md` to emphasize non-blocking terminal practices and MCP usage</li></ul> | `src/FUTURE_TASKS.md`<br/>`.github/copilot-instructions.md` |

---

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</details>

<!-- Generated by sourcery-ai[bot]: end review_guide -->
author_association: CONTRIBUTOR
user: login: coderabbitai[bot]
created_at: 2025-05-31T02:04:55Z
body: <!-- This is an auto-generated comment: summarize by coderabbit.ai -->
<!-- This is an auto-generated comment: rate limited by coderabbit.ai -->

> [!WARNING]
> ## Rate limit exceeded
> 
> @dmitriz has exceeded the limit for the number of commits or files that can be reviewed per hour. Please wait **0 minutes and 1 seconds** before requesting another review.
> 
> <details>
> <summary>⌛ How to resolve this issue?</summary>
> 
> After the wait time has elapsed, a review can be triggered using the `@coderabbitai review` command as a PR comment. Alternatively, push new commits to this PR.
> 
> We recommend that you space out your commits to avoid hitting the rate limit.
> 
> </details>
> 
> 
> <details>
> <summary>🚦 How do rate limits work?</summary>
> 
> CodeRabbit enforces hourly rate limits for each developer per organization.
> 
> Our paid plans have higher rate limits than the trial, open-source and free plans. In all cases, we re-allow further reviews after a brief timeout.
> 
> Please see our [FAQ](https://docs.coderabbit.ai/faq) for further information.
> 
> </details>
> 
> <details>
> <summary>📥 Commits</summary>
> 
> Reviewing files that changed from the base of the PR and between aec16e2cd4ee81ae96f5349c2c5b56839ca50a75 and 05130fafb52df8bff9054b5621e6129d3eb964a7.
> 
> </details>
> 
> <details>
> <summary>📒 Files selected for processing (2)</summary>
> 
> * `src/rate_limits.js` (13 hunks)
> * `src/utils/rate_limit_utils.js` (1 hunks)
> 
> </details>

<!-- end of auto-generated comment: rate limited by coderabbit.ai -->
<!-- walkthrough_start -->

<details>
<summary>📝 Walkthrough</summary>

## Summary by CodeRabbit

- **New Features**
  - Added real-time rate limit detection for multiple providers using live API endpoints and response headers.
  - Introduced standalone and class-based rate limiting utilities supporting token and request-based limits with multi-window tracking.
  - Provided exponential backoff utility for retry logic.

- **Improvements**
  - Enhanced documentation and user guidance for terminal usage and rate limit validation, emphasizing best practices and MCP server tools.
  - Expanded provider configurations with detailed metadata for rate limit detection and error handling.

- **Bug Fixes**
  - Corrected and validated documentation URLs for rate limits across supported providers.

- **Chores**
  - Updated and clarified task documentation reflecting user feedback and recent improvements.
## Summary by CodeRabbit

- **New Features**
  - Introduced real-time rate limit monitoring and detection, including functions to fetch and monitor current rate limits from providers.
  - Added a pure functional rate limiting module and a configurable rate limit manager for flexible usage tracking and enforcement.
  - Provided utility functions for rate limit types and exponential backoff with jitter.

- **Documentation**
  - Clarified and simplified terminal usage instructions, emphasizing non-blocking commands and MCP server usage.
  - Expanded and updated rate limit documentation, including validation strategies, user feedback, and implementation details.

## Walkthrough

This update introduces new pure functional and class-based rate limiting utilities, expands provider rate limit metadata, and adds real-time rate limit detection functions. Documentation and test files are revised for clarity and accuracy, with terminal usage instructions simplified and user feedback incorporated. No breaking changes to existing exports.

## Changes

| File(s)                          | Change Summary                                                                                                                                                                                                                     |
|---------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| .github/copilot-instructions.md | Simplified and clarified terminal usage policies, removed redundant checklist steps, emphasized MCP server usage, and replaced prescriptive command lists with explicit banned commands and best practices.                        |
| src/FUTURE_TASKS.md             | Added detailed section on rate limit documentation fixes, user feedback, implementation strategies, and updated metadata.                                                                                                        |
| src/rate_limits.js              | Expanded provider metadata, added real-time rate limit detection functions, refactored for pure functions, and improved header parsing logic. Exported new async functions for fetching and monitoring rate limits.               |
| src/rate_limits.test.js         | Broadened exclusion criteria for keys in provider tier object type assertions in tests.                                                                                                    |
| src/utils/rate_limit_functions.js | Introduced new pure functional rate limiting utilities: `cleanState`, `recordRequest`, and `checkRateLimit`, supporting immutable state management for requests and tokens.                                                       |
| src/utils/rate_limit_manager.js | Added a new `RateLimitManager` class for generic, configurable rate limiting with request and token tracking, header parsing, and window-based enforcement.                                                                       |
| src/utils/rate_limit_utils.js   | Introduced a utility module with `RATE_LIMIT_TYPES` and a `calculateBackoffDelay` function for exponential backoff with jitter.                                                                                                  |

## Sequence Diagram(s)

```mermaid
sequenceDiagram
  participant Client
  participant RateLimitManager
  participant APIProvider

  Client->>RateLimitManager: checkRateLimit(tokens)
  RateLimitManager-->>Client: {allowed, waitTime, reason}
  alt allowed
    Client->>RateLimitManager: recordRequest(tokens)
    RateLimitManager->>APIProvider: sendRequest()
    APIProvider-->>Client: response (with rate limit headers)
    Client->>RateLimitManager: parseRateLimitHeaders(headers)
  else not allowed
    Client-->>Client: wait or abort
  end
```

```mermaid
sequenceDiagram
  participant App
  participant rate_limits.js

  App->>rate_limits.js: fetchCurrentRateLimits(provider, apiKey)
  rate_limits.js->>APIProvider: GET rateLimitEndpoint/quotaEndpoint
  APIProvider-->>rate_limits.js: response (headers/data)
  rate_limits.js-->>App: parsed rate limit info or fallback
```

## Possibly related PRs

- dmitriz/llm-univ#7: Updates terminal management documentation to prevent blocking commands and prioritize MCP servers, directly overlapping with the documentation changes in this PR.

## Suggested labels

`refactor`

## Poem

> New rate limits bloom in code’s bright spring,  
> Pure functions and classes join the ring.  
> Docs are trimmed, instructions clear,  
> Real-time checks now persevere.  
> Tokens and requests in tidy rows,  
> The server hums, the limit knows.  
> 🚦✨

</details>

<!-- walkthrough_end -->
<!-- internal state start -->


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= 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<!-- tips_end -->
author_association: NONE
user: login: codiumai-pr-agent-free[bot]
created_at: 2025-05-31T02:05:21Z
body: ## PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

<table>
<tr><td>⏱️&nbsp;<strong>Estimated effort to review</strong>: 4 🔵🔵🔵🔵⚪</td></tr>
<tr><td>🧪&nbsp;<strong>PR contains tests</strong></td></tr>
<tr><td>🔒&nbsp;<strong>Security concerns</strong><br><br>

<strong>Sensitive information exposure:</strong><br> The fetchCurrentRateLimits and monitorRateLimitsViaTestRequest functions in rate_limits.js (lines 750-907) handle API keys directly and include them in HTTP requests. While this is necessary for authentication, the functions also return full response headers in the result object, which might include sensitive information like authentication tokens or internal system details. Consider filtering the headers to only return rate limit related information instead of exposing all headers.</td></tr>
<tr><td>⚡&nbsp;<strong>Recommended focus areas for review</strong><br><br>

<details><summary><a href='https://github.com/dmitriz/llm-univ/pull/11/files#diff-47617375ec5ac76ffce54ae72eb08e99bc4652bc126264d2ac966261b976b3ffR185-R189'><strong>Duplicate Endpoint</strong></a>

There are two quotaEndpoint declarations for the Google provider. The second declaration (line 188) will overwrite the first one (line 186), potentially causing issues with quota monitoring.
</summary>

```javascript
rateLimitEndpoint: 'https://generativelanguage.googleapis.com/v1beta/models:countTokens',
quotaEndpoint: 'https://generativelanguage.googleapis.com/v1beta/models',
// Current quota endpoint
quotaEndpoint: '/v1beta/models:quota',
// Extract from 429 error responses
```

</details>

<details><summary><a href='https://github.com/dmitriz/llm-univ/pull/11/files#diff-47617375ec5ac76ffce54ae72eb08e99bc4652bc126264d2ac966261b976b3ffR784-R791'><strong>Error Handling</strong></a>

The fetchCurrentRateLimits function doesn't properly handle the case when parseRateLimitHeaders returns an empty object. It attempts to access properties of headers that may not exist.
</summary>

```javascript
if (config.rateLimitHeaders) {
  const headers = parseRateLimitHeaders(response.headers, config.rateLimitHeaders);
  if (headers) {
    result.limits = headers.limits;
    result.remaining = headers.remaining;
    result.usage = headers.usage;
  }
}
```

</details>

<details><summary><a href='https://github.com/dmitriz/llm-univ/pull/11/files#diff-be48dc4512899c447e5e8d435642a7df1ffe3cf4bcf26cf63c2c484342e9aa68R43-R77'><strong>Potential Performance Issue</strong></a>

The cleanState function creates new arrays and objects for every call, which could cause performance issues with frequent calls. Consider optimizing to avoid unnecessary object creation.
</summary>

```javascript
function cleanState(state, provider) {
    const now = Date.now();
    const oneMinuteAgo = now - 60000;   // 60 seconds
    const oneDayAgo = now - 86400000;    // 24 hours

    // Get current provider state or initialize empty state
    const providerState = state[provider] || {
        minute: [],   // Array of {time, tokens} for minute window
        day: [],      // Array of {time, tokens} for day window
        tokens: { minute: 0, day: 0 } // Current token counts (cached)
    };

    // Filter minute window: keep only entries from last minute
    const cleanedMinute = providerState.minute.filter(entry => entry.time > oneMinuteAgo);
    // Sum tokens from non-expired minute entries
    const minuteTokens = cleanedMinute.reduce((sum, entry) => sum + entry.tokens, 0);

    // Filter day window: keep only entries from last 24 hours
    const cleanedDay = providerState.day.filter(entry => entry.time > oneDayAgo);
    // Sum tokens from non-expired day entries
    const dayTokens = cleanedDay.reduce((sum, entry) => sum + entry.tokens, 0);

    // Return new state with updated provider data
    return {
        ...state,
        [provider]: {
            minute: cleanedMinute,
            day: cleanedDay,
            tokens: {
                minute: minuteTokens,
                day: dayTokens
            }
        }
    };
}
```

</details>

</td></tr>
</table>

author_association: CONTRIBUTOR
user: login: codiumai-pr-agent-free[bot]
created_at: 2025-05-31T02:06:15Z
body: ## PR Code Suggestions ✨

<!-- e956227 -->

Explore these optional code suggestions:

<table><thead><tr><td><strong>Category</strong></td><td align=left><strong>Suggestion&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </strong></td><td align=center><strong>Impact</strong></td></tr><tbody><tr><td rowspan=2>Possible issue</td>
<td>



<details><summary>✅ 
Handle local providers correctly<!-- not_implemented -->
</summary>

___

<details><summary><b>Suggestion Impact:</b></summary>The commit implemented a more comprehensive authentication system with the getAuthHeaders function that handles different provider types. While not directly implementing the suggestion's exact code, it addresses the same issue by creating a flexible authentication system that can handle local providers like Ollama.

code diff:

```diff
@@ -738,6 +767,37 @@
   return tiers[tiers.length - 1] || 'unknown'; // Return highest tier if none meet requirements
 }
 
+/**
+ * Get authentication headers for a provider
+ * @param {string} provider - Provider name
+ * @param {string} apiKey - API key
+ * @returns {Object} - Authentication headers
+ */
+function getAuthHeaders(provider, apiKey) {
+  const config = PROVIDER_RATE_LIMITS[provider];
+  if (!config) {
+    throw new Error(`Unsupported provider: ${provider}`);
+  }
+
+  // Use provider-specific auth config or fall back to defaults
+  const authConfig = config.auth || {
+    type: 'api-key',
+    headerName: 'x-api-key'
+  };
+
+  const headers = {
+    'Content-Type': 'application/json'
+  };
+
+  if (authConfig.type === 'bearer') {
+    headers[authConfig.headerName] = `Bearer ${apiKey}`;
+  } else {
+    headers[authConfig.headerName] = apiKey;
+  }
+
+  return headers;
+}
```

</details>


___


**The function doesn't handle the case where the provider is 'ollama', which is a <br>local deployment that doesn't require an API key. Add a check to bypass the API <br>key requirement for local providers like 'ollama'.**

[src/rate_limits.js [750-758]](https://github.com/dmitriz/llm-univ/pull/11/files#diff-47617375ec5ac76ffce54ae72eb08e99bc4652bc126264d2ac966261b976b3ffR750-R758)

```diff
 async function fetchCurrentRateLimits(provider, apiKey) {
   const config = PROVIDER_RATE_LIMITS[provider];
   if (!config) {
     throw new Error(`Unsupported provider: ${provider}`);
   }
 
-  if (!apiKey) {
+  // Skip API key check for local providers like Ollama
+  const isLocalProvider = provider === 'ollama';
+  if (!apiKey && !isLocalProvider) {
     throw new Error(`API key required for ${provider}`);
   }
```

`[Suggestion processed]`

<details><summary>Suggestion importance[1-10]: 7</summary>

__

Why: Good catch that `ollama` is a local provider that shouldn't require an API key. The suggestion correctly identifies this edge case and provides an appropriate fix.


</details></details></td><td align=center>Medium

</td></tr><tr><td>



<details><summary>Fix token count calculation</summary>

___


**The token counts aren't properly recalculated when entries are filtered out. <br>When removing expired entries, you should recalculate the token counts for both <br>minute and day windows to maintain accurate token usage tracking.**

[src/utils/rate_limit_manager.js [69-80]](https://github.com/dmitriz/llm-univ/pull/11/files#diff-8423d81d6d3204e057c822e02c762c37124a51aad1a82ba191ee859e32224a86R69-R80)

```diff
 /**
  * Clean old entries outside time windows
  */
 cleanOldEntries() {
   const now = Date.now();
   const oneMinuteAgo = now - 60000;
   const oneDayAgo = now - 86400000;
 
+  // Store original entries to calculate token differences
+  const originalMinuteCount = this.usage.minute.length;
+  const originalDayCount = this.usage.day.length;
+
   this.usage.minute = this.usage.minute.filter(t => t > oneMinuteAgo);
   this.usage.day = this.usage.day.filter(t => t > oneDayAgo);
   
+  // Recalculate token counts based on removed entries
+  // This assumes equal token distribution per request, which should be improved
+  // in a production system by storing tokens with timestamps
+  if (originalMinuteCount > 0) {
+    const minuteRatio = this.usage.minute.length / originalMinuteCount;
+    this.usage.tokens.minute = Math.floor(this.usage.tokens.minute * minuteRatio);
+  }
+  
+  if (originalDayCount > 0) {
+    const dayRatio = this.usage.day.length / originalDayCount;
+    this.usage.tokens.day = Math.floor(this.usage.tokens.day * dayRatio);
+  }
+  
+  // Reset to zero if no entries remain
   if (this.usage.minute.length === 0) this.usage.tokens.minute = 0;
   if (this.usage.day.length === 0) this.usage.tokens.day = 0;
 }
```

- [ ] **Apply / Chat** <!-- /improve --apply_suggestion=1 -->

<details><summary>Suggestion importance[1-10]: 6</summary>

__

Why: Valid bug identification regarding token count recalculation when expired entries are removed. The suggested fix provides a reasonable workaround though it acknowledges limitations in the approach.


</details></details></td><td align=center>Low

</td></tr>
<tr><td align="center" colspan="2">

- [ ] Update <!-- /improve_multi --more_suggestions=true -->

</td><td></td></tr></tbody></table>
author_association: CONTRIBUTOR