io.github.tracelane/tracelane-mcp

Read-only, tenant-scoped access to Tracelane agent traces and guardrail verdicts

Connect this server

Add this to your MCP client config — claude_desktop_config.json (Claude Desktop) or .cursor/mcp.json (Cursor).Suits: Claude Desktop · Cursor.

{
  "mcpServers": {
    "tracelane-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@tracelanedev/mcp@0.4.0"
      ],
      "env": {
        "TRACELANE_API_KEY": "<your TRACELANE_API_KEY>",
        "TRACELANE_GATEWAY_URL": "<your TRACELANE_GATEWAY_URL>",
        "CLICKHOUSE_USER": "default",
        "CLICKHOUSE_PASSWORD": "<your CLICKHOUSE_PASSWORD>",
        "CLICKHOUSE_DB": "tracelane",
        "TRACELANE_MCP_TRANSPORT": "stdio"
      }
    }
  }
}

Environment variables

TRACELANE_API_KEYrequiredsecretTracelane API key (tlane_…). Resolved to a tenant once at startup via the gateway's /v1/auth/whoami; the server refuses to start if the key is rejected. Also the credential used to read trace data through the gateway when CLICKHOUSE_URL is unset.
TRACELANE_GATEWAY_URLrequiredBase URL of the Tracelane gateway. Validates TRACELANE_API_KEY, and — when CLICKHOUSE_URL is unset — is where every trace read goes. Must be https://…tracelane.dev outside development.
CLICKHOUSE_USERClickHouse username.
CLICKHOUSE_PASSWORDsecretClickHouse password.
CLICKHOUSE_DBClickHouse database holding the spans table.
TRACELANE_MCP_TRANSPORTTransport to serve. stdio (default) for desktop clients; http for the Streamable HTTP transport.

A starting point — check the repository for exact arguments and setup. Restart your client after editing the config.

Category: Developer Tools
Version: 0.4.0
Registry: active
Published: 10/9/2026

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