MCP Server

[jerbly]

This PR adds weaver registry mcp an MCP (Model Context Protocol) server that exposes the semantic conventions registry to LLMs. This enables natural language queries for finding and understanding conventions while writing instrumentation code.

Tool	Description
search	Search across all registry items (attributes, metrics, spans, events, entities)
get_attribute	Get detailed information about a specific attribute by key
get_metric	Get detailed information about a specific metric by name
get_span	Get detailed information about a specific span by type
get_event	Get detailed information about a specific event by name
get_entity	Get detailed information about a specific entity by type
live_check	Validate telemetry samples against the registry

[codecov]

Codecov Report

❌ Patch coverage is 87.58621% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.4%. Comparing base (20f8d96) to head (422ffa3).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/weaver_mcp/src/lib.rs	11.1%	16 Missing ⚠️
crates/weaver_mcp/src/service.rs	97.5%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #1113     +/-   ##
=======================================
+ Coverage   79.1%   80.4%   +1.2%     
=======================================
  Files        102     104      +2     
  Lines       7943    8229    +286     
=======================================
+ Hits        6284    6617    +333     
+ Misses      1659    1612     -47     

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[jsuereth]

I know this may be crazy, but is there any chance we can re-use the vanilla API server and just "wrap" API methods with MCP definitions instead of having two instances of serving / application flow?

I think there's a LOT of commonality between the two pieces, and it'd be ideal if we could share it.