feat(mcp): surface supported languages in MCP server instructions#678
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colbymchenry wants to merge 1 commit into
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feat(mcp): surface supported languages in MCP server instructions#678colbymchenry wants to merge 1 commit into
colbymchenry wants to merge 1 commit into
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The MCP `initialize` instructions — the first thing every agent sees about codegraph — listed no languages, so agents (and users) assumed languages like Rust weren't supported even though they're fully indexed, and skipped the codegraph tools. That was the real gap behind #671, where Rust has in fact worked end-to-end for several releases. Add one concise line to the opening paragraph of server-instructions.ts: "It indexes 20+ languages — TypeScript/JavaScript, Python, Go, Rust, Java, C#, C/C++, PHP, Ruby, Swift, Kotlin, and more." refs #671 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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What
The MCP
initializeinstructions — the first thing every agent sees about codegraph — listed no languages. So agents (and the users driving them) assumed languages like Rust weren't supported even though they're fully indexed, and skipped the codegraph tools entirely. That was the real gap behind #671 ("Rust support"), where Rust has in fact worked end-to-end for several releases (verified: structs/traits/impl/methods/calls,callers/callees/impact, traitimplementsedges, and Axum/Actix/Rocket route extraction + cargo-workspace resolution).This adds one concise line to the opening paragraph of
server-instructions.ts:Why here
server-instructions.tsis the single source of truth for agent-facing guidance (#529) and the first place the false "language X isn't supported" assumption forms. The README documents the full list, but it isn't reachable from inside the tool, which is where agents actually meet it.Testing
npm run build— cleannpx vitest run __tests__/mcp-initialize.test.ts— 3/3 pass (exercises theinitializeresponse that carries these instructions)refs #671
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