Build
Catalog and connections
What a document may reference, and how to validate before you put.
GET /api/build/catalog lists the models the workspace's plan allows, the connected apps with their tool counts, the trigger types and the limits. GET /api/build/connections lists the connection refs a document may name.
Validate before you put: POST …/validate runs the same compiler as a put and returns the list of changes it would apply, without applying any.