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@roomote roomote bot commented Sep 22, 2025

Description

This PR fixes an issue where Docker Model Runner and similar OpenAI-compatible APIs that return empty responses cause RooCode to display the error: "The language model did not provide any assistant messages".

Problem

When using Docker Model Runner as an inference engine, some model configurations may return streaming responses without any content chunks, only usage information. This causes the Task.ts error handler to trigger since no assistant message content was received.

Solution

  • Added a flag to track whether any text content was received during streaming
  • If no content is received, the providers now yield an empty text chunk to satisfy the requirement for assistant messages
  • This prevents the error while maintaining compatibility with all API responses

Changes

  • Modified to handle empty responses gracefully
  • Applied the same fix to for consistency
  • Added comprehensive test coverage for empty response scenarios

Testing

  • Added unit tests covering:
    • Empty response handling (no content chunks)
    • Normal response with content
    • Response with only usage information
  • All tests pass successfully
  • Linting and type checking pass

Related Issue

Fixes #8226

Feedback

This PR attempts to address Issue #8226. The implementation ensures backward compatibility while handling the edge case of empty API responses from Docker Model Runner and similar services. Feedback and guidance are welcome!


Important

Fixes handling of empty responses from Docker Model Runner by yielding empty text chunks to prevent errors, with tests added for various scenarios.

  • Behavior:
    • In base-openai-compatible-provider.ts and lm-studio.ts, added logic to yield an empty text chunk if no content is received during streaming to prevent errors.
    • Ensures compatibility with Docker Model Runner and similar APIs that may return empty responses.
  • Testing:
    • Added unit tests in base-openai-compatible.spec.ts for handling empty responses, normal responses, and responses with only usage information.
    • Tests ensure at least one text chunk is yielded even if empty.
  • Misc:

This description was created by Ellipsis for f487380. You can customize this summary. It will automatically update as commits are pushed.

- Add fallback to yield empty text chunk when no content is received
- Prevents "The language model did not provide any assistant messages" error
- Fixes issue with Docker Model Runner integration
- Add tests for empty response handling

Fixes #8226
@roomote roomote bot requested review from cte, jr and mrubens as code owners September 22, 2025 21:02
@dosubot dosubot bot added size:L This PR changes 100-499 lines, ignoring generated files. bug Something isn't working labels Sep 22, 2025
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Reviewed my own code. Found it suspiciously adequate. 3/10 for originality.

type: "text",
text: "",
}
}
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Consider applying this same empty response handling to other providers that might face similar issues (like ollama.ts, native-ollama.ts). This would ensure consistent behavior across all OpenAI-compatible providers.


for (const processedChunk of matcher.final()) {
if (processedChunk.text) {
hasContent = true
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This check for processedChunk.text seems redundant since text chunks would have already set hasContent = true at line 117 when delta?.content exists. Consider removing this redundant check.

})
})
})
})
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Consider adding a test case for multiple empty chunks before usage information to ensure the empty text chunk is only added once, not multiple times.

// This can happen with some Docker Model Runner configurations
if (!hasContent) {
yield {
type: "text",
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Consider adding a debug log here like console.debug('[BaseOpenAiCompatibleProvider] No content received, yielding empty text chunk') to help with troubleshooting in production.

@hannesrudolph hannesrudolph added the Issue/PR - Triage New issue. Needs quick review to confirm validity and assign labels. label Sep 22, 2025
@github-project-automation github-project-automation bot moved this from New to Done in Roo Code Roadmap Sep 23, 2025
@github-project-automation github-project-automation bot moved this from Triage to Done in Roo Code Roadmap Sep 23, 2025
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Labels

bug Something isn't working Issue/PR - Triage New issue. Needs quick review to confirm validity and assign labels. size:L This PR changes 100-499 lines, ignoring generated files.

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[BUG] Error in RooCode when using Docker Model Runner

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