Gives AI coding agents exactly the code they need instead of whole files. Semantic code graph, impact analysis, and MCP server in one static Rust binary.
Girder gives coding agents exactly the code they need, instead of whole files. It parses your repository into a living semantic graph — functions, definitions, call edges — and answers questions against that graph: exact function source, callers and callees, impact analysis, minimal test selection, and verified graph-addressed edits. It is one static Rust binary that any agent can drive over MCP, plus an optional native IDE.
Languages: Rust, Python, TypeScript, and Go. Rust and Python are the most mature; TypeScript and Go are measured and gated, with their limits written down (TypeScript, Go).
Tiers: the free tier is permanent and needs no account — getsource, finddefinition, searchcode, askcodebase, and reviewchanges on a single repository. The orient and impactedtests tools need a paid license. Keys are verified offline; the binary never phones home.
On this repository's committed ten-node measurement, girder context --source-only returned 8,765 bytes where full-file reads returned 408,137 — a 97.85% reduction. That counts bytes, not tokens.
A prebuilt binary, no Rust toolchain needed:
This builds the default headless profile and installs the girder binary to ~/.cargo/bin (make sure it's on your PATH). No GPU, display, network, or API key is required — the default AI provider is an offline MockProvider. The GUI and live AI providers are opt-in Cargo features not included in a plain install; see The GUI and Local-first AI below.
From the project README.
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