## Summary
- **Removed dead client-side refresh UI** in
`NotebookProposalRenderer.tsx` and its test — the diff preview is always
computed from live data, so the check was redundant with the tool's
server-side re-validation
- **Added typed `NotebookToolError`** in `notebook-tools.ts` with
structured metadata (`{ exposeToAssistant: boolean }`) validated by a
zod schema with a literal discriminant tag (`tag:
'notebook_tool_error'`) — tracks the two retryable failures: staleness
conflict and invalid operations (unknown cell id)
- **Encoded errors in `generate-v4.ts` onError** — the one place in the
pipeline that holds the live `Error` before it becomes a string in the
persisted message
- **Extracted and fixed message history filter** into new
`generate-assistant-response.utils.ts` — any tool-error whose
`errorText` decodes against the `NotebookToolError` schema is let
through (with `errorText` rewritten to plain prose so the model sees the
message, not JSON), while other errors stay filtered as before
Net effect: the assistant detects the specific, actionable rejection
reason and retries on its own with no dead button or human intervention
needed.
## Test plan
- Existing unit tests in `NotebookProposalRenderer.test.tsx` pass (dead
button test removed)
- New unit tests in `notebook-tools.test.ts` cover encode/decode
round-trips and error discrimination
- New unit tests in `generate-assistant-response.utils.test.ts` cover
message history filtering with all error states
- `pnpm typecheck` is clean
- `pnpm --filter studio run lint:ratchet` passes (no new ESLint
warnings)
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Notebook update errors now provide clearer, structured explanations to
the AI assistant.
* Assistant responses preserve relevant notebook error details while
filtering invalid or temporary tool states.
* **Bug Fixes**
* Improved handling of stale notebook revisions and invalid notebook
update operations.
* Notebook proposal rendering proceeds without an unnecessary refresh
step.
* **Tests**
* Expanded coverage for notebook errors, message filtering,
serialization, and error handling.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Charis
ebd616fa90