# MCP reference

The MCP server exposes the answering engine, project state, the warehouse schema, the issue queue, and the data-source review queue to analytics agents. It never returns or edits the ontology.

-   [Endpoint and authentication](/reference/mcp/endpoint/): The URL, OAuth and API keys, the tool surface, and the error convention.
-   [ask\_question](/reference/mcp/ask-question/): Parameters, response shape, and the plan-confirmation flow.
-   [Projects and status](/reference/mcp/projects/): ping, list\_projects, get\_project\_status.
-   [Source schema](/reference/mcp/source-schema/): get\_source\_schema, and the three table statuses.
-   [Source changes](/reference/mcp/source-changes/): list\_source\_changes, get\_source\_change, and why reviewing stays in the app.
-   [Issues](/reference/mcp/issues/): The triage queue, the evidence, and the only write tool.
-   [Evals](/reference/mcp/evals/): get\_eval\_run, and why a run starts elsewhere.