Gemini/Antigravity generateContent rejects the JSON Schema annotation
keywords deprecated, readOnly, writeOnly with a 400 INVALID_ARGUMENT.
MCP tool schemas (e.g. Claude Code) commonly set deprecated:true, making
every request with such a tool fail. Add them to
UNSUPPORTED_SCHEMA_CONSTRAINTS so cleanJSONSchemaForAntigravity removes
them recursively before the request is sent.
Co-authored-by: Cursor <cursoragent@cursor.com>
