Lachesis MCP Server

A compiler-precise code graph you can ask questions about: how data moves, who calls what, what reaches a sink. C, Python, and TypeScript, all in one graph. It runs locally over stdio via the published package.

People connecting developer tools tools to Claude, Cursor, VS Code, or another MCP client. The project is written in Python.

VERIFIED ACTIVE

LAST COMMIT 2026-08-25 · ★ 3 · #68 OF 139 MAINTAINED DEVELOPER TOOLS · VERIFIED 2026-08-25

AGPL-3.0 · Python servers · how we verify → /methodology

01 · Install Lachesis

Claude Code

claude mcp add unboundcompute-lachesis -- uvx lachesis-cpg

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "unboundcompute-lachesis": {
      "command": "uvx",
      "args": [
        "lachesis-cpg"
      ]
    }
  }
}

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

repo age created 2026-08-10 - young repo, little track record yet

license AGPL-3.0 - declared in the repository

pypi package lachesis-cpg - check the name against the project README before installing (PyPI has no namespace ownership)

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

03 · What Lachesis can do

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

Latest releases

v0.2.0 · 2026-08-24

This release introduces a source-rooted semantic flow analysis and a lifetime/typestate · candidate layer on top of the existing sink-reachability model. Pre-1.0: the graph schema · and candidate surface grow here…

v0.1.6 · 2026-08-21

Fix the MCP registry namespace casing so Lachesis can be published to the official registry. No code or API changes. · Fixed · server.json and the README mcp-name marker now use the GitHub organization's exact casing…

v0.1.5 · 2026-08-21

MCP registry metadata and a dev-focused README. No code or API changes. · Added · Repo-root server.json for the official MCP registry (io.github.unboundcompute/lachesis), describing the lachesis-cpg PyPI package and…

04 · Who maintains Lachesis

Lachesis is maintained by unboundcompute. It's the only MCP server we track from this author; the repo dates to Aug 2026.

05 · Facts

repository: github.com/unboundcompute/lachesis
category: developer tools - ranked #68 of 139 actively-maintained developer tools servers as of 2026-08-25.
release cadence: 5 releases in the last 90 days (latest 2026-08-24)
registry: io.github.UnboundCompute/lachesis (active, first published 2026-08-21 · 3 versions)
packages: pypi:lachesis-cpg

06 · Lachesis FAQ

What is Lachesis?

Is Lachesis still maintained?

Yes - as of 2026-08-25, its last commit was 2026-08-25 and it shipped 5 releases in the last 90 days. We re-verify nightly.

How do I install Lachesis?

Run `uvx lachesis-cpg`. You can also paste the ready-made client config above.

Does Lachesis run locally?

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

07 · Alternatives to Lachesis

Alternatives to Lachesis

Maintained developer tools servers if Lachesis isn't the fit.

Pairs well with

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

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