# Reference

Exact capabilities, command syntax, MCP parameters, ontology fields, limits, and error behavior.

-   [Capability matrix](/reference/capabilities/): Compare what the web app, MCP, CLI, and repository can do.
-   [CLI](/reference/cli/): Commands, options, output, and exit codes.
-   [MCP](/reference/mcp/): Endpoint, authentication, tool parameters, and response fields.
-   [Ontology schema](/reference/schema/): File layout and fields for domains, tables, joins, and metrics.
-   [Limits and errors](/reference/limits/): Timeouts, payload caps, exit codes, and what each failure means.