## Context

Sometimes the model likes to respond with `"[...]"` for the edits array,
instead of just `[...]`, which causes deserialisation to fail:
```
Failed to receive tool input: invalid type: string "[{"old_text": ..., "new_text": ...}]", expected a sequence
```

## How to Review

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## Self-Review Checklist

<!-- Check before requesting review: -->
- [x] I've reviewed my own diff for quality, security, and reliability
- [x] Unsafe blocks (if any) have justifying comments
- [x] The content is consistent with the [UI/UX
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
- [x] Tests cover the new/changed behavior
- [x] Performance impact has been considered and is acceptable

Release Notes:

- N/A

---------

Co-authored-by: Gaauwe Rombouts <mail@grombouts.nl>