## Summary
This PR adds support for custom tool callbacks and comprehensive e2e
testing for MCP calculator functionality.
## Key Features Added
- **Custom tool permission callbacks** - Allow dynamic tool permission
control via `can_use_tool` callback
- **E2E test suite** - Real Claude API tests validating MCP tool
execution end-to-end
- **Fixed MCP calculator example** - Now properly uses `allowed_tools`
for permission management
## Changes
### Custom Callbacks
- Added `ToolPermissionContext` and `PermissionResult` types for tool
permission handling
- Implemented `can_use_tool` callback support in SDK client
- Added comprehensive tests in `tests/test_tool_callbacks.py`
### E2E Testing Infrastructure
- Created `e2e-tests/` directory with pytest-based test suite
- `test_mcp_calculator.py` - Tests all calculator operations with real
API calls
- `conftest.py` - Pytest config with mandatory API key validation
- GitHub Actions workflow for automated e2e testing on main branch
- Comprehensive documentation in `e2e-tests/README.md`
### Bug Fixes
- Fixed MCP calculator example to use `allowed_tools` instead of
incorrect `permission_mode`
- Resolved tool permission issues preventing MCP tools from executing
## Testing
E2E tests require `ANTHROPIC_API_KEY` environment variable and will fail
without it.
Run locally:
```bash
export ANTHROPIC_API_KEY=your-key
python -m pytest e2e-tests/ -v -m e2e
```
Run unit tests including callback tests:
```bash
python -m pytest tests/test_tool_callbacks.py -v
```
🤖 Generated with [Claude Code](https://claude.ai/code)
---------
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Kashyap Murali <kashyap@anthropic.com>
