[pull] master from supabase:master - #1168
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## I have read the [CONTRIBUTING.md](https://github.com/supabase/supabase/blob/master/CONTRIBUTING.md) file. YES ## What kind of change does this PR introduce? Refactor / hardening ## What is the current behavior? The `update_notebook` AI tool re-fetches the notebook right before applying operations, but concurrent edits are last-write-wins: the model has no way to detect that the notebook changed since it planned the edit, so a stale diff can silently overwrite someone else's changes. ## What is the new behavior? - `get_notebook` now returns the notebook's `updated_at` timestamp. - `update_notebook` requires a new `expected_updated_at` input field (the `updated_at` the model got from `get_notebook`). - At execute time, after the existing re-fetch and before applying operations, `update_notebook` compares the fetched `updated_at` against `expected_updated_at` and throws a descriptive error if they don't match, telling the model to re-read the notebook and reissue the update. - The notebook system prompt and mock tools (used by the eval harness) are updated to match. ## Additional context <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **New Features** * Notebook retrieval now includes the latest update timestamp. * Notebook edits require confirmation that the content is current before saving. * **Bug Fixes** * Prevented stale edits from overwriting newer notebook changes. * Conflicting updates are rejected, allowing the latest content to be fetched before retrying. <!-- end of auto-generated comment: release notes by coderabbit.ai -->
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