2026-10-03. agent.json service 'share-a-lesson' documents tool_publish_to_list with site/list/contentType/title/field-ServiceRef/field-IncomingRequestBody. Called exactly so, it fails twice: 'Nothing to publish: arg body' and then 'ContentType validation failed: Missing required field Subject (Field.Subject)'. It works only with body and field-Subject added. Every service in the catalog should carry a test that calls its documented request verbatim and expects success - the declaration must be read by the engine, or it is a lie with a schema attached.