- Add extra_args dict field to pass arbitrary CLI flags
- Support both valued flags (--flag value) and boolean flags (--flag)
- Add comprehensive tests for the new functionality
- Allows SDK to work with future CLI flags without code changes
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Co-Authored-By: Claude <noreply@anthropic.com>
the `mcp_tools` field in `ClaudeCodeOptions` seems to have been there
since the initial commit but I couldn't find any references in the repo,
so I believe it may be vestigial and unused
This PR updates the version to 0.0.19 after publishing to PyPI.
## Changes
- Updated version in `pyproject.toml`
- Updated version in `src/claude_code_sdk/__init__.py`
## Release Information
- Published to PyPI: https://pypi.org/project/claude-code-sdk/0.0.19/
- Install with: `pip install claude-code-sdk==0.0.19`
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## Summary
Fixes a critical deadlock issue that occurs when MCP servers produce
verbose stderr output. The SDK would hang indefinitely when the stderr
pipe buffer filled up.
## The Problem
The deadlock occurred due to sequential reading of subprocess streams:
1. SDK reads stdout completely before reading stderr
2. When stderr pipe buffer fills (64KB on Linux, 16KB on macOS),
subprocess blocks on write
3. Subprocess can't continue to stdout, parent waits for stdout →
**DEADLOCK** 🔒
## The Solution
Redirect stderr to a temporary file instead of a pipe:
- **No pipe buffer** = no possibility of deadlock
- Temp file can grow as needed (no 64KB limit)
- Still capture stderr for error reporting (last 100 lines)
- Works consistently across all async backends
## Implementation Details
- `stderr=tempfile.NamedTemporaryFile()` instead of `stderr=PIPE`
- Use `deque(maxlen=100)` to keep only recent stderr lines in memory
- Temp file is automatically cleaned up on disconnect
- Add `[stderr truncated, showing last 100 lines]` message when buffer
is full
## Testing
- Verified no deadlock with 150+ lines of stderr output
- Confirmed stderr is still captured for error reporting
- All existing tests pass
- Works with asyncio, trio, and other anyio backends
## Impact
- Fixes consistent hangs in production with MCP servers
- No functional regression - stderr handling is preserved
- Simpler than concurrent reading alternatives
- More robust than pipe-based solutions
Fixes the issue reported in Slack where SDK would hang indefinitely when
receiving messages from MCP servers with verbose logging.
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Co-authored-by: Claude <noreply@anthropic.com>
This PR updates the version to 0.0.18 after publishing to PyPI.
## Changes
- Updated version in `pyproject.toml`
- Updated version in `src/claude_code_sdk/__init__.py`
## Release Information
- Published to PyPI: https://pypi.org/project/claude-code-sdk/0.0.18/
- Install with: `pip install claude-code-sdk==0.0.18`
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## Summary
- Add `settings` field to `ClaudeCodeOptions` to expose the `--settings`
CLI flag
- Allow SDK users to specify custom settings configuration path
## Changes
- Added `settings: str | None = None` field to `ClaudeCodeOptions`
dataclass
- Added CLI argument conversion logic in `SubprocessCLITransport` to
pass `--settings` flag to Claude Code CLI
## Test plan
- [x] All existing tests pass
- [x] Linting passes (`python -m ruff check`)
- [x] Type checking passes (`python -m mypy src/`)
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This PR updates the version to 0.0.17 after publishing to PyPI.
## Changes
- Updated version in `pyproject.toml`
- Updated version in `src/claude_code_sdk/__init__.py`
## Release Information
- Published to PyPI: https://pypi.org/project/claude-code-sdk/0.0.17/
- Install with: `pip install claude-code-sdk==0.0.17`
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## Summary
- Replace asyncio.create_task() with anyio task group for trio
compatibility
- Update client.py docstring example to use anyio.sleep
- Add trio example demonstrating multi-turn conversation
## Details
The SDK already uses anyio for most async operations, but one line was
using asyncio.create_task() which broke trio compatibility. This PR
fixes that by using anyio's task group API with proper lifecycle
management.
### Changes:
1. **subprocess_cli.py**: Replace asyncio.create_task() with anyio task
group, ensuring proper cleanup on disconnect
2. **client.py**: Update docstring example to use anyio.sleep instead of
asyncio.sleep
3. **streaming_mode_trio.py**: Add new example showing how to use the
SDK with trio
## Test plan
- [x] All existing tests pass
- [x] Manually tested with trio runtime (created test script that
successfully runs multi-turn conversation)
- [x] Linting and type checking pass
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This PR updates the version to 0.0.16 after publishing to PyPI.
## Changes
- Updated version in `pyproject.toml`
- Updated version in `src/claude_code_sdk/__init__.py`
## Release Information
- Published to PyPI: https://pypi.org/project/claude-code-sdk/0.0.16/
- Install with: `pip install claude-code-sdk==0.0.16`
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* Adds commit signing
* Converts sed pattern matching to a script to ensure we don't update
version values unrelated to PyPI
* Remove the `Publish to Test PyPI first'` step since it no longer works
- Uses claude-code-base-action for automated issue triage
- Analyzes new issues and applies appropriate labels
- Uses GitHub MCP server for issue operations
- Requires ANTHROPIC_API_KEY secret to be configured
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Co-Authored-By: Claude <noreply@anthropic.com>
This PR updates the version to 0.0.14 after publishing to PyPI.
## Changes
- Updated version in `pyproject.toml`
- Updated version in `src/claude_code_sdk/__init__.py`
## Release Information
- Published to PyPI: https://pypi.org/project/claude-code-sdk/0.0.14/
- Install with: `pip install claude-code-sdk==0.0.14`
## Next Steps
After merging this PR, a release tag will be created automatically.
Signed-off-by: Lina <lina@anthropic.com>
Add critical safety mechanisms to the sequential stderr reading approach:
- 10MB memory limit on stderr collection with truncation message
- 30 second timeout protection to prevent hanging
- Proper exit code based error detection instead of string matching
- Debug logging for stderr on successful runs
- Better exception handling for edge cases
This addresses potential production issues while maintaining FastAPI compatibility.
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Co-Authored-By: Claude <noreply@anthropic.com>
The test was checking source code for specific strings rather than
testing behavior. The existing subprocess tests already verify the
functionality works correctly.
Remove anyio.create_task_group() from receive_messages() to fix the
RuntimeError "Attempted to exit cancel scope in a different task than
it was entered in" when using the SDK with FastAPI's SSE streaming.
The issue occurred because FastAPI can move async generators between
different asyncio tasks during the streaming lifecycle, which conflicts
with anyio's cancel scope tracking.
Changes:
- Remove task group usage from receive_messages()
- Read stderr sequentially after stdout completes
- Add test to ensure no task groups are used
- Fix existing test expectation for buffer overflow
This is a minimal fix that maintains compatibility while solving the
core issue. The trade-off is that stderr is read after stdout instead
of concurrently, but this is unlikely to cause issues in practice.
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Co-Authored-By: Claude <noreply@anthropic.com>
Removed redundant comments that simply restate what the code is doing.
Kept only comments that provide valuable context or explain complex behavior.
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Co-Authored-By: Claude <noreply@anthropic.com>
The CLIJSONDecodeError constructor expects an Exception as the second
argument, not None. Changed to pass a ValueError with details about
the buffer size limit being exceeded.
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Co-Authored-By: Claude <noreply@anthropic.com>
