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Locus MCP Gives Coding Agents Semantic Code Navigation via Language Servers

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AI coding agents often struggle with structural questions that plain text search cannot answer reliably, such as true symbol definitions, affected callers, or expression types. Locus MCP is a semantic layer that connects MCP-compatible agents to language servers, exposing six tools for definitions, references, hover info, diagnostics, status, and rename previews. The tutorial walks through setting it up for a TypeScript project using typescript-language-server, requiring Node.js 22 or newer. Setup involves running an init command that generates configuration files and a check command that reports whether required binaries are available. The approach is meant to give agents better evidence before editing code, rather than replacing an IDE or automating refactors.

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