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Add support for MCP ToolAnnotations on SDK tools, allowing developers to specify tool metadata hints (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) via the @tool decorator. Changes: - Add optional `annotations` parameter to `@tool` decorator and `SdkMcpTool` dataclass - Pass annotations through to MCP Tool objects in create_sdk_mcp_server - Include annotations in JSONRPC tools/list responses (only when set) - Re-export `ToolAnnotations` from mcp.types for convenience - Add tests for annotation storage, MCP flow-through, and JSONRPC serialization Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
chrislloyd
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Feb 5, 2026
phil65
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Feb 17, 2026
- Add optional `annotations` parameter to the `@tool` decorator and `SdkMcpTool` dataclass, accepting `ToolAnnotations` from the MCP types library - Pass annotations through to MCP `Tool` objects in `create_sdk_mcp_server` and include them in JSONRPC `tools/list` responses (only when set, omitted when `None`) - Re-export `ToolAnnotations` from the top-level package for convenience - [x] `test_tool_annotations` - Verifies annotations are stored on `SdkMcpTool` instances and flow through the MCP `list_tools` handler - [x] `test_tool_annotations_in_jsonrpc` - Verifies annotations are correctly serialized in JSONRPC `tools/list` responses and omitted when not set - [x] All 8 tests in `test_sdk_mcp_integration.py` pass - [x] `ruff check` and `ruff format` pass - [x] `mypy` has no new errors (pre-existing issues only) <!-- CHANGELOG:START --> - Added support for MCP tool annotations via the `@tool` decorator's new `annotations` parameter, allowing developers to specify metadata hints like `readOnlyHint`, `destructiveHint`, `idempotentHint`, and `openWorldHint` - Re-exported `ToolAnnotations` from `claude_agent_sdk` for convenience <!-- CHANGELOG:END --> 🤖 Generated with [Claude Code](https://claude.com/claude-code) (0% 3-shotted by claude) Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
annotationsparameter to the@tooldecorator andSdkMcpTooldataclass, acceptingToolAnnotationsfrom the MCP types libraryToolobjects increate_sdk_mcp_serverand include them in JSONRPCtools/listresponses (only when set, omitted whenNone)ToolAnnotationsfrom the top-level package for convenienceTest plan
test_tool_annotations- Verifies annotations are stored onSdkMcpToolinstances and flow through the MCPlist_toolshandlertest_tool_annotations_in_jsonrpc- Verifies annotations are correctly serialized in JSONRPCtools/listresponses and omitted when not settest_sdk_mcp_integration.pypassruff checkandruff formatpassmypyhas no new errors (pre-existing issues only)Changelog
@tooldecorator's newannotationsparameter, allowing developers to specify metadata hints likereadOnlyHint,destructiveHint,idempotentHint, andopenWorldHintToolAnnotationsfromclaude_agent_sdkfor convenience🤖 Generated with Claude Code (0% 3-shotted by claude)