Malformed SDK input frames are repaired or dropped instead of erroring, on remote… / Claude Code v2.1.238

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Useful2 Signal2

Elsewhere not in their notes

Odd or damaged input frames on remote connections are now fixed up or quietly dropped instead of erroring out.

CLAUDE_CODE_DISABLE_NESTED_USER_REPAIR

What

On a remote transport, a streaming input frame whose message role is not user no longer produces a parse error: a user message wrapped one level deep is unwrapped and used, and anything else is dropped and retired. A control_request missing its request object or with a non-string subtype is dropped too. Local transports keep the old error behaviour.

Details

New telemetry tengu_sdk_malformed_input carries message_type, reason, transport and outcome, where outcome is one of dropped, unwrap_refused, repair_disabled or repaired.
CLAUDE_CODE_DISABLE_NESTED_USER_REPAIR turns the unwrap off; it is a boolean env var and is unset by default, so repair is on wherever the remote path runs, and disabling it reports repair_disabled.

Evidence

Repaired a nested user message (one level), Dropping control_request: missing request object or non-string subtype

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

Malformed SDK input frames are repaired or dropped instead of erroring, on remote transports