Locus MCP Server

Locus is local code search for coding agents. It indexes the repository on the machine, ranks chunks with BM25, and returns the path, line range, symbol, score, and chunk text.

People who work with code search, rag and developer tools and want it reachable from Claude, Cursor, VS Code, or another MCP client. The project is written in TypeScript.

NO LONGER MAINTAINED

LAST COMMIT 2026-09-25 · ★ 12 · VERIFIED 2026-09-30

MIT · TypeScript servers · how we verify → /methodology

01 · Install Locus

before you install - you'll need

The README does not document required environment variables for a basic install.

Claude Code

claude mcp add sylphxai-locus -- npx -y @sylphx/locus

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "sylphxai-locus": {
      "command": "npx",
      "args": [
        "-y",
        "@sylphx/locus"
      ]
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as local process (stdio) - runs on your machine with your user's permissions

repository archived on GitHub - read-only; no future fixes, security or otherwise

license MIT - declared in the repository

npm package @sylphx/locus - the @sylphx scope differs from the repo owner (sylphxai); confirm it's the project's official package

registry namespace io.github.SylphxAI is GitHub-verified and matches the repo owner

03 · What Locus can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

What you can build

An agent gets 2 documented tools across codebase, read & search, including codebase_search, find_related.

The 2 tools it gives your agent

Extracted from the project's README - what Locus lets an agent do.

codebase_search: - You can name words that appear in the code
find_related: - You already have a file and a line

Latest releases

@sylphx/[email protected] · 2026-09-23

Name the ranker BM25 on the public surfaces, prefer LOCUS_ROOT, and write new indexes under .locus/. CODERAG_ROOT and .coderag/ still work when the new names are absent. A legacy cache hit copies both the index and the…

@sylphx/[email protected] · 2026-09-23

04 · Who maintains Locus

Locus is maintained by sylphxai. We track 13 MCP servers from sylphxai - 3 actively maintained, 2,932 combined GitHub stars, oldest repo from Apr 2025. Full record: all servers from sylphxai.

05 · Facts

repository: github.com/sylphxai/locus
website: https://sylphxai.github.io/locus/
category: AI & ML - dead as of 2026-09-30.
release cadence: 10+ releases in the last 90 days (latest 2026-09-23)
registry: io.github.SylphxAI/locus (deprecated, first published 2026-09-23 · 5 versions)
packages: npm:@sylphx/locus

06 · Locus FAQ

What is Locus?

Locus is local code search for coding agents. It indexes the repository on the machine, ranks chunks with BM25, and returns the path, line range, symbol, score, and chunk text.

Is Locus still maintained?

Its last commit was 2026-09-25 (as of 2026-09-30) - we classify it as dead.

How do I install Locus?

Run `npx -y @sylphx/locus`. The README does not document required environment variables for a basic install. You can also paste the ready-made client config above.

Does Locus run locally?

Yes - it's a stdio server: it runs on your machine (via npx) with your user's permissions. Your data stays local unless the server itself calls external APIs.

07 · Alternatives to Locus

Alternatives to Locus

Maintained AI & ML servers if Locus isn't the fit.

Pairs well with

Servers that cover what Locus doesn't - only shown when the pairing reason fits the companion.