API Reference: your app's models, fields and actions as a page, and as what agents read
Each app environment now has an API Reference after Playground: every model with its fields, their types, filters, sorts and descriptions, who may read it, and every action with its params, who may call it and what queues it, each as SDK, curl, fetch and MCP code with Try in Playground. Copy it as Markdown, or download it as JSON or OpenAPI 3.1; the API serves the same at …/reference and …/openapi.json. A new description on a field, a schema, a param or an action's options shows there, in the generated types and to agents.
The reference is worked out from the environment's files, the way the records API, the generated client types and the MCP server work them out, so all four say the same thing. An "As role" picker narrows the page to what one role may read and call; a search box finds a model, field or action.
The MCP server reads from it too: list_actions lists every action with its params as JSON Schema, get_reference returns the reference as Markdown for an agent to read once, run_action names the actions in its own schema, and list_models carries descriptions, each field's filter operators and who may read it.
More in Your app's reference.