> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://poly-ai.ferndocs.com/advanced/extend-with-code/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://poly-ai.ferndocs.com/_mcp/server.

# Extend with code

## Docs

- [Extend with code](https://poly-ai.ferndocs.com/advanced/extend-with-code/overview.md): Write Python functions to integrate APIs, validate input, and add custom business logic to your agent.
- [Agent Development Kit (ADK)](https://poly-ai.ferndocs.com/advanced/extend-with-code/adk.md): Python CLI for building, managing, and deploying PolyAI agents locally with a Git-like pull-edit-push workflow.