typescript-sdk/.changeset/sep-414-trace-context-meta-keys.md
Matt 78fbe2736d
feat(core): reserved trace context _meta keys and propagation docs (SEP-414) (#2270)
Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>
2026-06-15 12:32:08 +00:00

415 B

@modelcontextprotocol/core
patch

Add reserved trace context _meta key constants (TRACEPARENT_META_KEY, TRACESTATE_META_KEY, BAGGAGE_META_KEY) per SEP-414, plus docs and a passthrough regression test. The spec reserves the unprefixed _meta keys traceparent, tracestate, and baggage (W3C Trace Context / W3C Baggage formats) for distributed tracing; the SDK passes them through untouched.