stacklok / toolhive / 21836742205

62%

Build Type

push

github

Committed by web-flow

Commit Message

Add W3C Trace Context propagation via MCP _meta (#3682)

* Add W3C Trace Context propagation via MCP _meta

Add MetaCarrier (TextMapCarrier for MCP _meta fields) and
InjectMetaTraceContext for injecting traceparent/tracestate
into outgoing MCP requests, per the MCP OTEL specification.

This enables distributed tracing across vMCP → backend boundaries
using the standard W3C Trace Context format propagated through
MCP params._meta.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Address review comments for trace context propagation

- Add compile-time assertion that MetaCarrier implements propagation.TextMapCarrier
- Refactor TestMetaCarrier_GetSetKeys to use table-driven test pattern for Get operations

Co-authored-by: Jakub Hrozek <jhrozek@users.noreply.github.com>

* Fix lint: Add t.Parallel() to table-driven test subtests

- Added t.Parallel() call in subtests to satisfy paralleltest/tparallel linters
- Maintains test isolation while allowing parallel execution

Co-authored-by: Chris Burns <ChrisJBurns@users.noreply.github.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Co-authored-by: claude[bot] <41898282+claude[bot]@users.noreply.github.com>
Co-authored-by: Jakub Hrozek <jhrozek@users.noreply.github.com>
Co-authored-by: Chris Burns <ChrisJBurns@users.noreply.github.com>

Run Details

29 of 29 new or added lines in 1 file covered. (100.0%)

35 existing lines in 4 files now uncovered.

42363 of 69054 relevant lines covered (61.35%)

75.29 hits per line