Noodles creates interactive diagrams visualizing how code works by building function call graphs via tree-sitter AST parsing. It can analyze entire repositories or GitHub PRs, generating mermaid diagrams with pan/zoom/drill-down capabilities. The tool optionally enriches nodes and edges with AI-generated descriptions using providers like Anthropic, OpenAI, and Gemini. It also ships as an MCP server, enabling Claude Code to query repositories and PRs directly.