Graph Tool Call

Graph Tool Call is a Python library and MCP server for modeling API and function tools as graphs to optimize retrieval of tool workflows for LLM agents. Instead of just returning single tool matches like a vector search, it builds and traverses a tool graph to surface relevant multi-step workflows, boosting accuracy and dramatically reducing context/token usage. It supports OpenAPI, MCP, LangChain, and direct Python integration, making it ideal for advanced AI agent developers and integrators managing large catalogs of tools or APIs.