Vibe Coding
Claude Code fixed subagents being reported as failed when the final streamed reply omitted token usage or a model id
2.1.273 fixes sub-agents and background agents being reported as failed with their result never delivered when the final streamed reply carried no token usage or model id, and separately fixes SDK and `--output-format stream-json` output dropping a subagent's remaining messages and final report after it is backgrounded mid-run (for example by `CLAUDE_AUTO_BACKGROUND_TASKS`). Anyone building a dispatcher on top of the SDK has been silently losing completed agent output on both paths. Worth re-running any pipeline that reported phantom agent failures this month.
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