mcp/CHANGELOG_0.6.12.md

Hanzo MCP v0.6.12 Release Notes

🐛 Bug Fixes

Fixed Pydantic Deprecation Warnings

• Resolved persistent Pydantic v2 deprecation warnings from litellm library
• Wrapped all litellm imports with warning suppression context managers
• No more PydanticDeprecatedSince20 warnings when running uvx hanzo-mcp

Fixed stdio Transport Protocol Integrity

• Eliminated all logging output to stdout/stderr in stdio transport mode
• Configured FastMCP logging to ERROR level for stdio transport
• Redirected stderr to devnull for complete protocol compliance
• Ensures clean JSON-RPC communication without corruption

🧪 Testing Improvements

New Tests Added

• test_stdio_protocol.py: Comprehensive stdio protocol integrity test
• test_litellm_warnings.py: Verification that deprecation warnings are suppressed
• All tests now properly organized in tests/ directory

Test Coverage

• Validates stdio transport produces only valid JSON output
• Tests error conditions don't break protocol
• Ensures no logging leaks into stdio communication
• Verifies litellm imports don't trigger warnings

🔧 Technical Details

Warning Suppression Implementation

# Import litellm with warnings suppressed
import warnings
with warnings.catch_warnings():
    warnings.simplefilter("ignore", DeprecationWarning)
    import litellm

Logging Configuration for stdio

• Early configuration using FastMCP's configure_logging(level="ERROR")
• Standard logging disabled with empty handlers
• stderr redirected to devnull for complete silence

📝 Files Modified

• hanzo_mcp/tools/agent/agent_tool.py
• hanzo_mcp/tools/agent/agent.py
• hanzo_mcp/tools/agent/tool_adapter.py
• hanzo_mcp/cli.py
• hanzo_mcp/server.py
• hanzo_mcp/__init__.py
• 12 files converted from print() to logging
• New test files added

✅ All Tests Pass

• No Pydantic deprecation warnings
• stdio protocol integrity maintained
• All existing tests continue to pass