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## 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>