fix(opencode): coalesce system messages for OpenAI-compatible providers - #42801
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ondrejch wants to merge 1 commit into
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fix(opencode): coalesce system messages for OpenAI-compatible providers#42801ondrejch wants to merge 1 commit into
ondrejch wants to merge 1 commit into
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The following comment was made by an LLM, it may be inaccurate: Potential Related PRs FoundPR #38671 -
PR #39905 -
PR #19961 -
PR #16981 -
The most significant one is #38671, which you've already acknowledged in your PR description as a related prior approach to this problem. |
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Issue for this PR
Fixes #34321
Related: #15059, #23656, #34322, #38671
Type of change
What does this PR do?
Plugins can append system instructions through
experimental.chat.system.transform, producing multiple system messages.OpenAI-compatible local backends such as SGLang/vLLM serving Qwen reject
that message shape with
System message must be at the beginning.This coalesces system blocks only for
@ai-sdk/openai-compatiblebeforedispatch. Other providers retain their existing multi-system behavior,
including Anthropic prompt-cache boundaries.
Unlike #38671, this does not globally merge adjacent system messages.
How did you verify your code works?
bun test test/provider/transform.test.tsfrompackages/opencodebun typecheckfrompackages/opencodeScreenshots / recordings
If this is a UI change, please include a screenshot or recording.
Checklist