Add meta field passthrough for MCP Apps support#624
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jgiuffrida
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jasnonaz
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Adds the `meta` parameter to the tool definition pipeline so tools can
declare associated UI resources via `meta={"ui": {"resourceUri": "ui://..."}}`.
This is the plumbing needed to support MCP Apps without adding any features.
Also adds CLAUDE.md, tool authoring docs in CONTRIBUTING.md, and tests
for the meta passthrough.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
DevonFulcher
reviewed
Mar 4, 2026
- Rename "MCP App tool" to "tool with interactive UI" - Clarify why structured_output=True is needed - Recommend Pydantic models for return types Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
jairus-m
reviewed
Mar 5, 2026
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
b-per
reviewed
Mar 18, 2026
| # We haven't strictly defined our tool contracts yet. | ||
| # So we're setting this to False by default for now. | ||
| structured_output: bool | None = False | ||
| meta: dict[str, Any] | None = None |
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Isn't there a risk to confuse ourselves/people between the MCP tool meta and the concept of meta in dbt that we already rely on in the MCP server?
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Summary
meta: dict[str, Any] | None = NonetoGenericToolDefinition, the@dbt_mcp_tooldecorator, andregister_tools()passthrough toFastMCP.add_tool()metadefaults toNone)meta={"ui": {"resourceUri": "ui://..."}}CLAUDE.mdwith project architecture overview for AI-assisted developmentCONTRIBUTING.mdMockFastMCPin test conftest to capturetool_kwargsfor future test assertionsTest plan
uv run pytest tests/ --ignore=tests/integration -x -q)adapt_context(),to_fastmcp_internal_tool(), andgeneric_register_tools()for bothmeta=valueandmeta=None🤖 Generated with Claude Code