## Summary
- Add `enable_file_checkpointing` option to `ClaudeAgentOptions`
- Add `rewind_files(user_message_id)` method to `ClaudeSDKClient` and
`Query`
- Add `SDKControlRewindFilesRequest` type for the control protocol
- Set `CLAUDE_CODE_ENABLE_SDK_FILE_CHECKPOINTING` env var when enabled
This adds Python SDK support for the file rewind feature from
claude-cli-internal PR #11265.
## Test plan
- [x] Verified imports work correctly
- [x] Verified linting passes (`ruff check`)
- [x] Verified existing tests still pass (106 passed, pre-existing
failures unrelated to this change)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
---------
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Ashwin Bhat <ashwin@anthropic.com>
## Summary
- Adds optional `timeout` field to `HookMatcher` dataclass in `types.py`
that allows users to specify a custom timeout (in seconds) for hooks
- Propagates the timeout value through:
- `client.py` and `_internal/client.py`: `_convert_hooks_to_internal()`
method
- `_internal/query.py`: hook config sent to CLI
## Test plan
- [x] Verify hooks work without timeout specified (default behavior)
- [x] Verify custom timeout is passed to CLI when specified in
HookMatcher
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-authored-by: Claude <noreply@anthropic.com>
Replace all dated model references (claude-sonnet-4-20250514,
claude-3-5-sonnet-20241022) with the simplified claude-sonnet-4-5
identifier across examples, tests, and documentation.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-authored-by: Claude <noreply@anthropic.com>
`query` supports custom transport, but ClaudeSDKClient does not. So I
add this feature. eg.
```python
from claude_code_sdk import ClaudeSDKClient, Transport
class MyCustomTransport(Transport):
# Implement custom transport logic
pass
transport = MyCustomTransport()
async with ClaudeSDKClient( transport=transport) as client:
await client.query("Greet Alice")
# Extract and print response
async for msg in client.receive_response():
print(msg)
```
