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Ran 09 Feb 2026 06:45PM UTC

Files 519

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Committed 09 Feb 2026 06:37PM UTC coverage: 61.348% (-0.03%) from 61.379%

Job # 21836742205.1

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push

github

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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>

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