[BUG] Claude Code transport issue

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Mid-turn, the Claude Code CLI aborted the streaming response with API Error: Stream idle timeout - partial response received. The assistant's turn was cut off before the tool call completed, and the session did not auto-resume — the user had to manually prompt the agent to continue.

What Should Happen?

Either (a) the CLI should recover transparently from a transient stream idle timeout without surfacing a partial response as a user-visible error, or (b) if the stream truly cannot recover, the CLI should automatically retry / resume the turn rather than leaving the session in a half-completed state that the user has to nudge back to life.

Steps to Reproduce

Run a long-running autonomous task in Claude Code (in this case, a Flutter-rewrite context-recovery session that reads many files in parallel and then begins authoring a mockup spec).
Let the assistant's turn include multiple parallel tool calls followed by a lengthy text generation.
Observe the stream stalling past the idle-timeout window, causing the CLI to emit the error and stop.

Error Messages/Logs

API Error: Stream idle timeout - partial response received

Steps to Reproduce

Run a long-running autonomous task in Claude Code (in this case, a Flutter-rewrite context-recovery session that reads many files in parallel and then begins authoring a mockup spec).
Let the assistant's turn include multiple parallel tool calls followed by a lengthy text generation.
Observe the stream stalling past the idle-timeout window, causing the CLI to emit the error and stop.

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

1.0.123

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_