Investigate agentk drops message from Rails API
MR: Pending
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## Description
Follow up on the discussion [here](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/196223#note_2596658867), we would like to investigate why agentk drops error messages passed from Rails API. Then provide a fix to it (maybe in second issue).
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## Acceptance criteria
- [ ] Investigate why agentk drops error messages passed from Rails API
- [ ] Provide a proper solution for the fix (Could use a second issue)
## Implementation plan
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[Provide a high-level plan for implementation of this issue, including relevant technical and/or design details.]
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issue