Problem
During a long conversation with multiple subagents (Agent Teams), Claude repeatedly generates output that renders as "Human:" turns in the conversation UI. The user did not write these messages, but they appear as user messages in the conversation flow.
This has occurred 3+ times in a single session. Examples:
- A structured message with 3 numbered items appeared as a "Human:" turn — the user did not write it
- A "yes, please do that." response appeared as a "Human:" turn following Claude's question
- A "go ahead and add the tests..." message appeared as a "Human:" turn
Impact
This is an integrity violation — fabricating user input is explicitly prohibited. The user cannot distinguish between their own messages and Claude-generated messages that appear with the "Human:" prefix.
Environment
- Claude Code CLI (Opus 4.6, 1M context)
- Long conversation with many subagents (Agent Teams with 10+ teammates)
- Multiple context compactions occurred during the session
- Platform: macOS (Darwin 25.5.0)
Reproduction
Difficult to reproduce reliably. Occurred during a session with:
- Heavy use of Agent Teams (TeamCreate, SendMessage, multiple concurrent teammates)
- Multiple teammate idle notifications interleaved with user messages
- Context compaction events
- Session length: ~3 hours
Expected Behavior
Claude should never generate text that appears as a "Human:" turn in the conversation. All Claude output should be clearly attributed to Claude.
Problem
During a long conversation with multiple subagents (Agent Teams), Claude repeatedly generates output that renders as "Human:" turns in the conversation UI. The user did not write these messages, but they appear as user messages in the conversation flow.
This has occurred 3+ times in a single session. Examples:
Impact
This is an integrity violation — fabricating user input is explicitly prohibited. The user cannot distinguish between their own messages and Claude-generated messages that appear with the "Human:" prefix.
Environment
Reproduction
Difficult to reproduce reliably. Occurred during a session with:
Expected Behavior
Claude should never generate text that appears as a "Human:" turn in the conversation. All Claude output should be clearly attributed to Claude.