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A Claude Messages request carrying MCP-style tool schemas failed before inference when routed to Antigravity/Gemini: the private backend parses function declarations as a limited proto-JSON Schema and rejects unknown fields, so `propertyNames` produced Unknown name "propertyNames" at 'request.tools[0].function_declarations[0].parameters.properties[0].value' The cleaner already lists `propertyNames` as unsupported, but every cleaning pass is skipped for nodes classified as property maps, and that classification matched any path ending in ".properties". A tool may declare a property named "properties" — Notion's page tools do — and the schema for that property then sits at ".properties.properties", so it was mistaken for a property map and nothing inside it was cleaned. The 400 above points at exactly that node. Replace the suffix match with a parity check over the trailing run of name-map keywords: the node a keyword names is a map only when its own parent is a schema, so "properties" is a map, "properties.properties" is the schema of a property named "properties", and a third repetition is a map again. Only the trailing run is inspected, so a schema nested under any prefix by the caller is classified the same way. Codex/OpenAI egress is untouched: it converts input_schema separately, uses non-strict tool mode, and accepts this shape.