.Net: Fix #13232: Add empty parameters schema for NonInvocableTool placeholder#13278
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dmytrostruk merged 2 commits intoNov 3, 2025
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… placeholder - Updated the `s_nonInvocableFunctionTool` to include a function description and parameters schema for better clarity and compatibility. - Added unit tests to validate the parameters schema of `NonInvocableTool`, ensuring it meets Mistral's requirements and does not cause errors with Mistral APIs
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Motivation and Context
Why is this change required?
NonInvocableTool placeholder is created without a parameters field, which causes 422 errors when used with Mistral models via LiteLLM since Mistral enforces stricter JSON schema validation than other AI providers.
What problem does it solve?
Current Issue:
When Semantic Kernel has no invocable tools but needs to send tools to keep the service happy, it includes the NonInvocableTool placeholder. This lacks a parameters field, causing Mistral APIs to reject requests.
What scenario does it contribute to?
This fix enables SK to work with:
Use Cases:
Applications using Mistral as their AI provider
Enterprise applications with strict API validation requirements
Description
Solution
Updated the NonInvocableTool creation to include a proper empty parameters schema that satisfies Mistral's validation requirements while maintaining backward compatibility with all other providers
Changes Made
File: src/Connectors/Connectors.OpenAI/Core/ClientCore.ChatCompletion.cs
Line 61-64: Enhanced s_nonInvocableFunctionTool with proper parameters schema
Added: Comprehensive unit tests verifying schema structure and Mistral compatibility
Existing Tests: All 474 OpenAI connector tests pass (1 skipped)
Integration Tests: Verified with local Mistral via Ollama + LiteLLM
Backward Compatibility: Confirmed no breaking changes with OpenAI and other providers
Note: I 've noticed that this similar empty schema is used as a property called
s_zeroFunctionParametersSchemathat exists atOpenAIFunction.csContribution Checklist