ya-agent-sdk 0.19.3
Application framework for building AI agents with Pydantic AI - environment abstractions, session management, and hierarchical agent patterns
Requires Python: <3.14,>=3.11
Keywords: python

# Ya Agent SDK

> Yet Another Agent SDK

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Yet Another Agent SDK for building AI agents with [Pydantic AI](https://ai.pydantic.dev/). Used at my homelab for research and prototyping.

## Key Features

- **Environment-based Architecture**: Protocol-based design for file operations, shell access, and resources. Built-in `LocalEnvironment` and `DockerEnvironment`, easily extensible for custom backends (SSH, S3, cloud VMs, etc.)
- **Fully Typed**: Complete type annotations validated with pyright (standard mode). Enjoy full IDE autocompletion and catch errors before runtime
- **Resumable Sessions**: Export and restore `AgentContext` state for multi-turn conversations across restarts
- **Hierarchical Agents**: Subagent system with task delegation, tool inheritance, and markdown-based configuration
- **Skills System**: Markdown-based instruction files with hot reload and progressive loading
- **Human-in-the-Loop**: Built-in approval workflows for sensitive tool operations
- **Toolset Architecture**: Extensible tool system with pre/post hooks for logging, validation, and error handling
- **Resumable Resources**: Export and restore resource states (like browser sessions) across process restarts
- **Browser Automation**: Docker-based headless Chrome sandbox for safe browser automation
- **Streaming Support**: Real-time streaming of agent responses and tool executions

## Installation

```bash
# Recommended: install with all optional dependencies
pip install ya-agent-sdk[all]
uv add ya-agent-sdk[all]

# Or install individual extras as needed
pip install ya-agent-sdk[docker]    # Docker sandbox support
pip install ya-agent-sdk[web]       # Web tools (tavily, firecrawl, markitdown)
pip install ya-agent-sdk[document]  # Document processing (pymupdf, markitdown)
```

## Project Structure

This repository contains:

- **ya_agent_sdk/** - Core SDK with environment abstraction, toolsets, and session management
- **yaacli/** - Reference CLI implementation with TUI for interactive agent sessions
- **examples/** - Code examples demonstrating SDK features
- **docs/** - Documentation for SDK architecture and APIs

## Quick Start

### Using the SDK

```python
from ya_agent_sdk.agents import create_agent, stream_agent

# create_agent returns AgentRuntime (not a context manager)
runtime = create_agent("openai:gpt-4o")

# stream_agent manages runtime lifecycle automatically
async with stream_agent(runtime, "Hello") as streamer:
    async for event in streamer:
        print(event)
```

### Using YAACLI CLI

For a ready-to-use terminal interface, try [yaacli](yaacli/README.md) - a TUI reference implementation built on top of ya-agent-sdk:

```bash
# Run directly with uvx (no installation needed)
uvx yaacli

# Or install globally
uv tool install yaacli
pip install yaacli
```

Features:

- Rich terminal UI with syntax highlighting and streaming output
- Built-in tool approval workflows (human-in-the-loop)
- Session management with conversation history
- Browser automation support via Docker sandbox
- MCP (Model Context Protocol) server integration

## Examples

Check out the [examples/](examples/) directory:

| Example                                     | Description                                                             |
| ------------------------------------------- | ----------------------------------------------------------------------- |
| [general.py](examples/general.py)           | Complete pattern with streaming, HITL approval, and session persistence |
| [deepresearch.py](examples/deepresearch.py) | Autonomous research agent with web search and content extraction        |
| [browser_use.py](examples/browser_use.py)   | Browser automation with Docker-based headless Chrome sandbox            |

## For Agent Users

If you're using an AI agent (e.g., Claude, Cursor) that supports skills:

- **Clone this repo**: The [SKILL.md](SKILL.md) file in the repository root provides comprehensive guidance for agents
- **Download release package**: Get the latest `SKILL.zip` from the [Releases](https://github.com/wh1isper/ya-agent-sdk/releases) page (automatically built during each release)

## Configuration

Copy `examples/.env.example` to `examples/.env` and configure your API keys.

## Documentation

- [AgentContext & Sessions](docs/context.md) - Session state, resumable sessions, extending context
- [Streaming & Hooks](docs/streaming.md) - Real-time streaming, lifecycle hooks, event handling
- [Toolset Architecture](docs/toolset.md) - Create tools, use hooks, handle errors, extend Toolset
- [Subagent System](docs/subagent.md) - Hierarchical agents, builtin presets, markdown configuration
- [Message Bus](docs/message-bus.md) - Inter-agent communication, user steering during execution
- [Skills System](docs/skills.md) - Markdown-based skills, hot reload, pre-scan hooks
- [Custom Environments](docs/environment.md) - Environment lifecycle, resource management
- [Resumable Resources](docs/resumable-resources.md) - Export and restore resource states across restarts
- [Model Configuration](docs/model.md) - Provider setup, gateway mode
- [Logging Configuration](docs/logging.md) - Configure SDK logging levels

## Development

See [CONTRIBUTING.md](CONTRIBUTING.md) for development setup and guidelines.