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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 ·

Malformed-message reports say what shape arrived

Reports about malformed incoming messages now record the message's shape rather than a prose description.

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
1Signal: worth watching, 1 to 5
TelemetryArea: what it touches
Internal ChangesKind: in v2.1.239,
Internal ChangesSection of the release
What

When an inbound user message is dropped or repaired, the report now carries the message's wire shape and whether it had an event identifier, replacing a free-text English description of the problem.

Details
  • The same two fields appear on the telemetry event, on the structured log line, and in the debug output.
Evidence

cli_malformed_user_message

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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