xAI rejects minLength, maxLength, minItems, maxItems, minContains, and
maxContains in tool schemas with a 502 error instead of ignoring them.
This causes all requests to fail when any tool definition includes these
validation-constraint keywords (e.g. sessions_spawn uses maxLength and
maxItems on its attachment fields).
Add stripXaiUnsupportedKeywords() in schema/clean-for-xai.ts, mirroring
the existing cleanSchemaForGemini() pattern. Apply it in normalizeToolParameters()
when the provider is xai directly, or openrouter with an x-ai/* model id.
Fixes tool calls for x-ai/grok-* models both direct and via OpenRouter.
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>
- Expand schema scrubber to strip additional constraint keywords rejected
by Cloud Code Assist (examples, minLength, maxLength, minimum, maximum,
multipleOf, pattern, format, minItems, maxItems, uniqueItems,
minProperties, maxProperties)
- Extend tool call ID sanitization to cover toolUse and toolCall block
types (previously only functionCall was sanitized)
- Update pi-tools test to include 'examples' in unsupported keywords
Fixes 400 errors when using google-antigravity/claude-opus-4-5-thinking:
- tools.N.custom.input_schema: JSON schema is invalid
- messages.N.content.N.tool_use.id: String should match pattern
