Internal error: classifyHandoffIfNeeded is not defined after subagent completion

Description

When using the Task tool to launch a Bash subagent, the agent completed its work successfully but then failed with an internal error.

Error Message

classifyHandoffIfNeeded is not defined

Context

• Task: Commit and push changes to a file (CLAUDE.md)
• Subagent type: Bash
• Claude Code version: 2.1.29
• What happened: The subagent successfully:

1. Ran git status and git diff
2. Ran git log to check commit style
3. Staged the file with git add
4. Created a commit with git commit
5. Pushed to remote with git push

All git operations completed successfully (commit 857ad7e46 was created and pushed to origin/master). However, after the push completed and the agent was about to return its summary, it failed with the internal error.

Expected Behavior

The subagent should complete and return its result without error after successfully performing the requested operations.

Actual Behavior

The task notification shows status "failed" with the error "classifyHandoffIfNeeded is not defined", even though all requested operations completed successfully.

Reproduction

1. Use Task tool with subagent_type="Bash" to perform a git commit and push
2. Wait for the subagent to complete its work
3. Observe the internal error after the work is done

Additional Context

The error appears to occur in the agent handoff/completion phase, not during the actual work. The transcript shows the agent successfully completed its work and was about to return its summary when the error occurred.