The Cloud Code Assist API rejects anyOf/oneOf in tool schemas, not just
unsupported keywords. The image tool (index 21) had:
image: { anyOf: [{ type: "string" }, { type: "array" }] }
which caused "JSON schema is invalid" errors when forwarded to Anthropic
via google-antigravity.
simplifyUnionVariants only handles literal unions and single non-null
variants. This adds a fallback in cleanSchemaForGeminiWithDefs that
flattens any remaining anyOf/oneOf to a simple type schema.
Also reverts the previous provider-aware normalizeToolParameters and
sanitizeToolsForGoogle changes, which were incorrect — the cleaning IS
needed for Google's API regardless of which downstream model is used.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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