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Sem

Sem provides local code navigation, structural diffs and impact analysis through stdio MCP. Requires Node.js/npm and an existing Git checkout; no Sem API key. The first query may create an index. The full server also exposes validation tools that can execute commands. Use trusted repositories and client approval controls; SEM_REPO is not a sandbox.

  • Official
  • Development & Testing
  • Local (stdio)

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Opens this server in the app, where you choose the client and scope.

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What you'll need

  • SEM_REPOAbsolute path to an existing local Git checkout on the MCP client host

Manual configuration

For clients that read an mcpServers JSON file. Replace values in angle brackets.

{
  "mcpServers": {
    "sem": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@ataraxy-labs/sem@0.27.0",
        "mcp"
      ],
      "env": {
        "SEM_REPO": "<SEM_REPO>"
      }
    }
  }
}
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