---
title: 'Smart Routing'
description: 'AI-powered tool discovery using vector semantic search'
---

## Overview

Smart Routing is MCPHub's intelligent tool discovery system that uses vector semantic search to automatically find the most relevant tools for any given task. Instead of manually specifying which tools to use, AI clients can describe what they want to accomplish, and Smart Routing will identify and provide access to the most appropriate tools.

## How Smart Routing Works

### 1. Tool Indexing

When servers start up, Smart Routing automatically:

- Discovers all available tools from MCP servers
- Extracts tool metadata (names, descriptions, parameters)
- Converts tool information to vector embeddings
- Stores embeddings in PostgreSQL with pgvector

### 2. Semantic Search

When a query is made:

- User queries are converted to vector embeddings
- Similarity search finds matching tools using cosine similarity
- Dynamic thresholds filter out irrelevant results
- Results are ranked by relevance score

### 3. Intelligent Filtering

Smart Routing applies several filters:

- **Relevance Threshold**: Only returns tools above similarity threshold
- **Context Awareness**: Considers conversation context
- **Tool Availability**: Ensures tools are currently accessible
- **Permission Filtering**: Respects user access permissions

### 4. Tool Execution

Found tools can be directly executed:

- Parameter validation ensures correct tool usage
- Error handling provides helpful feedback
- Response formatting maintains consistency
- Logging tracks tool usage for analytics

## Prerequisites

Smart Routing requires additional setup compared to basic MCPHub usage:

### Required Components

1. **PostgreSQL with pgvector**: Vector database for embeddings storage
2. **Embedding Service**: OpenAI API or compatible service
3. **Environment Configuration**: Proper configuration variables

### Quick Setup

<Tabs>
  <Tab title="Docker Compose">
    Use this `docker-compose.yml` for complete setup:

    ```yaml
    version: '3.8'
    services:
      mcphub:
        image: samanhappy/mcphub:latest
        ports:
          - "3000:3000"
        environment:
          - DATABASE_URL=postgresql://mcphub:password@postgres:5432/mcphub
          - OPENAI_API_KEY=your_openai_api_key
          - ENABLE_SMART_ROUTING=true
        depends_on:
          - postgres
        volumes:
          - ./mcp_settings.json:/app/mcp_settings.json

      postgres:
        image: pgvector/pgvector:pg16
        environment:
          - POSTGRES_DB=mcphub
          - POSTGRES_USER=mcphub
          - POSTGRES_PASSWORD=password
        volumes:
          - postgres_data:/var/lib/postgresql/data
        ports:
          - "5432:5432"

    volumes:
      postgres_data:
    ```

    Start with:
    ```bash
    docker-compose up -d
    ```

  </Tab>

  <Tab title="Manual Setup">
    1. **Install PostgreSQL with pgvector**:
    ```bash
    # Using Docker
    docker run -d \
      --name mcphub-postgres \
      -e POSTGRES_DB=mcphub \
      -e POSTGRES_USER=mcphub \
      -e POSTGRES_PASSWORD=your_password \
      -p 5432:5432 \
      pgvector/pgvector:pg16
    ```

    2. **Set Environment Variables**:
    ```bash
    export DATABASE_URL="postgresql://mcphub:your_password@localhost:5432/mcphub"
    export OPENAI_API_KEY="your_openai_api_key"
    export ENABLE_SMART_ROUTING="true"
    ```

    3. **Start MCPHub**:
    ```bash
    mcphub
    ```

  </Tab>

  <Tab title="Kubernetes">
    Deploy with these Kubernetes manifests:

    ```yaml
    # postgres-deployment.yaml
    apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: postgres
    spec:
      selector:
        matchLabels:
          app: postgres
      template:
        metadata:
          labels:
            app: postgres
        spec:
          containers:
          - name: postgres
            image: pgvector/pgvector:pg16
            env:
            - name: POSTGRES_DB
              value: mcphub
            - name: POSTGRES_USER
              value: mcphub
            - name: POSTGRES_PASSWORD
              valueFrom:
                secretKeyRef:
                  name: postgres-secret
                  key: password
            ports:
            - containerPort: 5432
    ---
    # mcphub-deployment.yaml
    apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: mcphub
    spec:
      selector:
        matchLabels:
          app: mcphub
      template:
        metadata:
          labels:
            app: mcphub
        spec:
          containers:
          - name: mcphub
            image: samanhappy/mcphub:latest
            env:
            - name: DATABASE_URL
              value: "postgresql://mcphub:password@postgres:5432/mcphub"
            - name: OPENAI_API_KEY
              valueFrom:
                secretKeyRef:
                  name: openai-secret
                  key: api-key
            - name: ENABLE_SMART_ROUTING
              value: "true"
            ports:
            - containerPort: 3000
    ```

  </Tab>
</Tabs>

## Configuration

### Environment Variables

Configure Smart Routing with these environment variables:

```bash
# Required
DATABASE_URL=postgresql://user:password@host:5432/database
OPENAI_API_KEY=your_openai_api_key

# Optional
ENABLE_SMART_ROUTING=true
EMBEDDING_MODEL=text-embedding-3-small
SIMILARITY_THRESHOLD=0.7
MAX_TOOLS_RETURNED=10
EMBEDDING_BATCH_SIZE=100
```

### Configuration Options

<AccordionGroup>
  <Accordion title="Database Configuration">
    ```bash
    # Full PostgreSQL connection string
    DATABASE_URL=postgresql://username:password@host:port/database?schema=public

    # SSL configuration for cloud databases
    DATABASE_URL=postgresql://user:pass@host:5432/db?sslmode=require

    # Connection pool settings
    DATABASE_POOL_SIZE=20
    DATABASE_TIMEOUT=30000
    ```

  </Accordion>

  <Accordion title="Embedding Service">
    ```bash
    # OpenAI (default)
    OPENAI_API_KEY=sk-your-api-key
    EMBEDDING_MODEL=text-embedding-3-small

    # Azure OpenAI
    AZURE_OPENAI_ENDPOINT=https://your-resource.openai.azure.com
    AZURE_OPENAI_API_KEY=your-api-key
    AZURE_OPENAI_DEPLOYMENT=your-embedding-deployment

    # Custom embedding service
    EMBEDDING_SERVICE_URL=https://your-embedding-service.com
    EMBEDDING_SERVICE_API_KEY=your-api-key
    ```

  </Accordion>

  <Accordion title="Search Parameters">
    ```bash
    # Similarity threshold (0.0 to 1.0)
    SIMILARITY_THRESHOLD=0.7

    # Maximum tools to return
    MAX_TOOLS_RETURNED=10

    # Minimum query length for smart routing
    MIN_QUERY_LENGTH=5

    # Cache TTL for embeddings (seconds)
    EMBEDDING_CACHE_TTL=3600
    ```

  </Accordion>
</AccordionGroup>

## Using Smart Routing

### Smart Routing Endpoint

Access Smart Routing through the special `$smart` endpoint:

<Tabs>
  <Tab title="HTTP MCP">
    ```
    http://localhost:3000/mcp/$smart
    ```
  </Tab>

  <Tab title="SSE (Legacy)">
    ```
    http://localhost:3000/sse/$smart
    ```
  </Tab>
</Tabs>

### Basic Usage

Connect your AI client to the Smart Routing endpoint and make natural language requests:

```bash
# Example: Find tools for web scraping
curl -X POST http://localhost:3000/mcp/$smart \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "tools/search",
    "params": {
      "query": "scrape website content and extract text"
    }
  }'
```

Response:

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "tools": [
      {
        "name": "fetch_html",
        "server": "fetch",
        "description": "Fetch and parse HTML content from a URL",
        "relevanceScore": 0.92,
        "parameters": { ... }
      },
      {
        "name": "playwright_navigate",
        "server": "playwright",
        "description": "Navigate to a web page and extract content",
        "relevanceScore": 0.87,
        "parameters": { ... }
      }
    ]
  }
}
```

### Advanced Queries

Smart Routing supports various query types:

<AccordionGroup>
  <Accordion title="Task-Based Queries">
    ```bash
    # What you want to accomplish
    curl -X POST http://localhost:3000/mcp/$smart \
      -H "Content-Type: application/json" \
      -d '{
        "jsonrpc": "2.0",
        "id": 1,
        "method": "tools/search",
        "params": {
          "query": "send a message to a slack channel"
        }
      }'
    ```
  </Accordion>

  <Accordion title="Domain-Specific Queries">
    ```bash
    # Specific domain or technology
    curl -X POST http://localhost:3000/mcp/$smart \
      -H "Content-Type: application/json" \
      -d '{
        "jsonrpc": "2.0",
        "id": 1,
        "method": "tools/search",
        "params": {
          "query": "database operations SQL queries"
        }
      }'
    ```
  </Accordion>

  <Accordion title="Action-Oriented Queries">
    ```bash
    # Specific actions
    curl -X POST http://localhost:3000/mcp/$smart \
      -H "Content-Type: application/json" \
      -d '{
        "jsonrpc": "2.0",
        "id": 1,
        "method": "tools/search",
        "params": {
          "query": "create file upload to github repository"
        }
      }'
    ```
  </Accordion>

  <Accordion title="Context-Aware Queries">
    ```bash
    # Include context for better results
    curl -X POST http://localhost:3000/mcp/$smart \
      -H "Content-Type: application/json" \
      -d '{
        "jsonrpc": "2.0",
        "id": 1,
        "method": "tools/search",
        "params": {
          "query": "automated testing web application",
          "context": {
            "project": "e-commerce website",
            "technologies": ["React", "Node.js"],
            "environment": "staging"
          }
        }
      }'
    ```
  </Accordion>
</AccordionGroup>

### Tool Execution

Once Smart Routing finds relevant tools, you can execute them directly:

```bash
# Execute a found tool
curl -X POST http://localhost:3000/mcp/$smart \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "id": 2,
    "method": "tools/call",
    "params": {
      "name": "fetch_html",
      "arguments": {
        "url": "https://example.com"
      }
    }
  }'
```

## Performance Optimization

### Embedding Cache

Smart Routing caches embeddings to improve performance:

```bash
# Configure cache settings
EMBEDDING_CACHE_TTL=3600        # Cache for 1 hour
EMBEDDING_CACHE_SIZE=10000      # Cache up to 10k embeddings
EMBEDDING_CACHE_CLEANUP=300     # Cleanup every 5 minutes
```

### Batch Processing

Tools are indexed in batches for efficiency:

```bash
# Batch size for embedding generation
EMBEDDING_BATCH_SIZE=100

# Concurrent embedding requests
EMBEDDING_CONCURRENCY=5

# Index update frequency
INDEX_UPDATE_INTERVAL=3600      # Re-index every hour
```

### Database Optimization

Optimize PostgreSQL for vector operations:

```sql
-- Create indexes for better performance
CREATE INDEX ON tool_embeddings USING hnsw (embedding vector_cosine_ops);

-- Adjust PostgreSQL settings
ALTER SYSTEM SET shared_preload_libraries = 'vector';
ALTER SYSTEM SET max_connections = 200;
ALTER SYSTEM SET shared_buffers = '256MB';
ALTER SYSTEM SET effective_cache_size = '1GB';
```

## Monitoring and Analytics

### Smart Routing Metrics

Monitor Smart Routing performance:

```bash
# Get Smart Routing statistics
curl http://localhost:3000/api/smart-routing/stats \
  -H "Authorization: Bearer YOUR_JWT_TOKEN"
```

Response includes:

- Query count and frequency
- Average response time
- Embedding cache hit rate
- Most popular tools
- Query patterns

### Tool Usage Analytics

Track which tools are found and used:

```bash
# Get tool usage analytics
curl http://localhost:3000/api/smart-routing/analytics \
  -H "Authorization: Bearer YOUR_JWT_TOKEN"
```

Metrics include:

- Tool discovery rates
- Execution success rates
- User satisfaction scores
- Query-to-execution conversion

### Performance Monitoring

Monitor system performance:

```bash
# Database performance
curl http://localhost:3000/api/smart-routing/db-stats \
  -H "Authorization: Bearer YOUR_JWT_TOKEN"

# Embedding service status
curl http://localhost:3000/api/smart-routing/embedding-stats \
  -H "Authorization: Bearer YOUR_JWT_TOKEN"
```

## Advanced Features

### Custom Embeddings

Use custom embedding models:

```bash
# Hugging Face models
EMBEDDING_SERVICE=huggingface
HUGGINGFACE_MODEL=sentence-transformers/all-MiniLM-L6-v2
HUGGINGFACE_API_KEY=your_api_key

# Local embedding service
EMBEDDING_SERVICE=local
EMBEDDING_SERVICE_URL=http://localhost:8080/embeddings
```

### Query Enhancement

Enhance queries for better results:

```json
{
  "queryEnhancement": {
    "enabled": true,
    "expandAcronyms": true,
    "addSynonyms": true,
    "contextualExpansion": true
  }
}
```

### Result Filtering

Filter results based on criteria:

```json
{
  "resultFiltering": {
    "minRelevanceScore": 0.7,
    "maxResults": 10,
    "preferredServers": ["fetch", "playwright"],
    "excludeServers": ["deprecated-server"]
  }
}
```

### Feedback Learning

Improve results based on user feedback:

```bash
# Provide feedback on search results
curl -X POST http://localhost:3000/api/smart-routing/feedback \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_JWT_TOKEN" \
  -d '{
    "queryId": "search-123",
    "toolName": "fetch_html",
    "rating": 5,
    "successful": true,
    "comments": "Perfect tool for the task"
  }'
```

## Troubleshooting

<AccordionGroup>
  <Accordion title="Database Connection Issues">
    **Symptoms:**
    - Smart Routing not available
    - Database connection errors
    - Embedding storage failures

    **Solutions:**
    1. Verify PostgreSQL is running
    2. Check DATABASE_URL format
    3. Ensure pgvector extension is installed
    4. Test connection manually:
    ```bash
    psql $DATABASE_URL -c "SELECT 1;"
    ```

  </Accordion>

  <Accordion title="Embedding Service Problems">
    **Symptoms:**
    - Tool indexing failures
    - Query processing errors
    - API rate limit errors

    **Solutions:**
    1. Verify API key validity
    2. Check network connectivity
    3. Monitor rate limits
    4. Test embedding service:
    ```bash
    curl -X POST https://api.openai.com/v1/embeddings \
      -H "Authorization: Bearer $OPENAI_API_KEY" \
      -H "Content-Type: application/json" \
      -d '{"input": "test", "model": "text-embedding-3-small"}'
    ```

  </Accordion>

  <Accordion title="Poor Search Results">
    **Symptoms:**
    - Irrelevant tools returned
    - Low relevance scores
    - Missing expected tools

    **Solutions:**
    1. Adjust similarity threshold
    2. Re-index tools with better descriptions
    3. Use more specific queries
    4. Check tool metadata quality
    ```bash
    # Re-index all tools
    curl -X POST http://localhost:3000/api/smart-routing/reindex \
      -H "Authorization: Bearer YOUR_JWT_TOKEN"
    ```

  </Accordion>

  <Accordion title="Performance Issues">
    **Symptoms:**
    - Slow query responses
    - High database load
    - Memory usage spikes

    **Solutions:**
    1. Optimize database configuration
    2. Increase cache sizes
    3. Reduce batch sizes
    4. Monitor system resources
    ```bash
    # Check system performance
    curl http://localhost:3000/api/smart-routing/performance \
      -H "Authorization: Bearer YOUR_JWT_TOKEN"
    ```

  </Accordion>
</AccordionGroup>

## Best Practices

### Query Writing

<Tip>
  **Be Descriptive**: Use specific, descriptive language in queries for better tool matching.
</Tip>

<Tip>
  **Include Context**: Provide relevant context about your task or domain for more accurate results.
</Tip>

<Tip>**Use Natural Language**: Write queries as you would describe the task to a human.</Tip>

### Tool Descriptions

<Warning>
  **Quality Metadata**: Ensure MCP servers provide high-quality tool descriptions and metadata.
</Warning>

<Warning>**Regular Updates**: Keep tool descriptions current as functionality evolves.</Warning>

<Warning>
  **Consistent Naming**: Use consistent naming conventions across tools and servers.
</Warning>

### System Maintenance

<Info>**Regular Re-indexing**: Periodically re-index tools to ensure embedding quality.</Info>

<Info>**Monitor Performance**: Track query patterns and optimize based on usage.</Info>

<Info>
  **Update Models**: Consider updating to newer embedding models as they become available.
</Info>

## Next Steps

<CardGroup cols={2}>
  <Card title="Authentication" icon="shield" href="/features/authentication">
    User management and access control
  </Card>
  <Card title="Monitoring" icon="chart-line" href="/features/monitoring">
    System monitoring and analytics
  </Card>
  <Card title="API Reference" icon="code" href="/api-reference/smart-routing">
    Complete Smart Routing API documentation
  </Card>
  <Card title="Configuration" icon="cog" href="/configuration/environment-variables">
    Advanced configuration options
  </Card>
</CardGroup>