Girder ships a semantic code graph as one static Rust binary and claims a 97.85% byte cut versus full-file reads

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Girder parses a repo into functions, definitions and call edges, then answers agent queries over that graph through MCP: exact function source, callers and callees, impact analysis, minimal test selection and graph-addressed edits. Its committed ten-node measurement returns 8,765 bytes where full-file reads return 408,137, a 97.85% reduction in bytes (not tokens). Rust and Python support are the mature ones with TypeScript and Go gated and their limits documented; the free tier covers get_source, find_definition, search_code, ask_codebase and review_changes with offline license verification and no telemetry. Created 2026-09-07.