Cloud Code API error: Invalid JSON

[dapper merlin]

I can't get this to work, I keep getting an error
Cloud Code Assist API error (400): Invalid JSON payload received. Unknown name "patternProperties" at 'request.tools[0].function_declarations[3].parameters.properties[2].value': Cannot find field.

[oak mountain]

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[obtuse wedge]

That specific 400 is almost always Cloud Code Assist (Gemini) tool-schema incompatibility: the endpoint only accepts a subset of JSON Schema, and it rejects keywords like patternProperties (exactly what your error says).

Fix

1. Check your OpenClaw version (this was fixed by adding a “Gemini schema cleaner” in newer builds):

• Run: openclaw --version
• If you’re older than 2026.1.9, update OpenClaw and restart the gateway, then retry.

2. If you can’t update right now, work around it by:

• Switching to a non–Cloud Code Assist model/provider for tool use (Cloud Code is the picky one), or
• Simplifying/removing custom tools that generate patternProperties (common culprit: “dictionary/map” types). Stick to:
  • type: "object", properties, required, simple enum
  • avoid anyOf/oneOf/allOf, patternProperties, additionalProperties, minLength/maxLength, format, etc.

Quick questions so I can point you to the exact next step

• What does openclaw --version show?
• Are you using a google-antigravity/... model (Cloud Code Assist), and did you add any custom tools?

(There’s also a troubleshooting note here—currently in the zh-CN docs, but the checklist is exactly the above: https://docs.openclaw.ai/zh-CN/gateway/troubleshooting )