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Sweep 22 Oct 2026 · 21:04Z Build v2.1.309 528 read Stable v2.1.308 Latest v2.1.309 Next v2.1.309 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.239 ·

Trace context can be picked up from an incoming request

Telemetry spans can now join a trace that was started by whatever called in.

Under the hood Internal Changes
JSON All of v2.1.239
Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
TelemetryArea: what it touches
Internal ChangesKind: in v2.1.239,
Internal ChangesSection of the release
What

New helpers read a W3C traceparent header into a telemetry context and run work inside it, so spans can join a trace started elsewhere. They do nothing when telemetry is off or when no header is present, in which case the work runs as before.

Evidence

traceparent

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.239 →

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