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February 11, 2026 13:24
…nput has a properties field, which avoids the Copilot 400: object schema missing properties.
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Feb 12, 2026
Normalize tool parameter schema so that any object-type tool input has a properties field. This avoids the Copilot 400 error: "object schema missing properties". PR: ericc-ch#192
jacks0n
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Feb 12, 2026
Normalize tool parameter schema so that any object-type tool input has a properties field. This avoids the Copilot 400 error: "object schema missing properties". PR: ericc-ch#192
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Background
When calling Copilot chat completions, we received a 400 error:
Invalid schema for function 'mcp__pencil__get_style_guide_tags': In context=(), object schema missing properties.Change
Add a defensive normalization step so any tool parameter schema with [type: "object"] always includes a [properties]field before sending to Copilot.
Result
Fixes the invalid_function_parameters error and allows tool calls to be accepted correctly by Copilot.