Girder: a local code-graph MCP server that halves agent context burn

AdSuccessful1178 · reddit · 2026-09-08

A new open-source MCP server, Girder, parses a repo into a semantic graph (functions, types, call and test edges) and serves it over stdio MCP so agents stop burning context reading whole files. Its orient tool answers source + callers + callees + tests + impact in one call — 48,814 bytes over 15 calls vs 101,302 bytes over 78 calls chaining other tools. It's a single offline Rust binary supporting Rust, Python, TypeScript/TSX, and Go, installable via claude mcp add girder -- npx -y girder-mcp ..

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