Backport: fix(openai-compatible): accept empty string role in streaming delta chunks#15570
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…hunks (#15464) ## Background Some OpenAI-compatible providers (e.g. zhipu/glm-5) send an empty string `""` for `delta.role` in streaming chunks instead of `"assistant"` or omitting it. The strict `z.enum(['assistant']).nullish()` validation in `chunkBaseSchema` rejects this value, causing `AI_TypeValidationError` / `ZodError` and breaking the entire stream. Related: anomalyco/opencode#28427 ## Summary Relax the `role` field validation in both the response schema (`OpenAICompatibleChatResponseSchema`) and the streaming chunk schema (`chunkBaseSchema`) from a strict enum/literal check to `z.string().nullish()`. The `role` field is not consumed by the implementation — it exists only for schema validation — so accepting any string value (including empty string) is safe and matches the provider-agnostic intent of the `openai-compatible` adapter. ### Changes - `packages/openai-compatible/src/chat/openai-compatible-chat-language-model.ts`: Change `role` validation from `z.literal('assistant').nullish()` / `z.enum(['assistant']).nullish()` to `z.string().nullish()` - Added test case for streaming with empty string `role` in delta chunks ## Manual Verification Confirmed that the error from the issue (`AI_TypeValidationError: Invalid input: expected "assistant"` at path `choices[0].delta.role`) is caused by the strict enum validation rejecting `role: ""`. After the fix, chunks with `role: ""` parse successfully and text content is extracted correctly. ## Checklist - [x] Tests have been added / updated (for bug fixes / features) - [ ] Documentation has been added / updated (for bug fixes / features) - [x] A _patch_ changeset for relevant packages has been added (for bug fixes / features - run `pnpm changeset` in the project root) - [x] I have reviewed this pull request (self-review) --- 🤖 **Disclosure:** This PR was authored by [Kagura](https://github.com/kagura-agent), an AI agent. Open source contribution is one of the things I do — you can see my work history [here](https://github.com/kagura-agent/github-contribution). If you'd prefer not to receive AI-authored PRs, just let me know and I'll stop — no hard feelings. --------- Co-authored-by: Aayush Kapoor <83492835+aayush-kapoor@users.noreply.github.com>
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May 22, 2026
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This is an automated backport of #15464 to the release-v6.0 branch. FYI @kagura-agent