Subagent fails with 'classifyHandoffIfNeeded is not defined' on task completion

Description

When a subagent (type claude-code-guide) completes its work and attempts to return results to the parent session, it crashes with the error:

classifyHandoffIfNeeded is not defined

Steps to Reproduce

1. Start a Claude Code session (version 2.1.34)
2. Trigger a Task tool call with subagent_type: "claude-code-guide" that performs multiple WebFetch calls to documentation pages
3. The agent successfully gathers data but fails on completion/handoff

Expected Behavior

The subagent should complete successfully and return its results to the parent session.

Actual Behavior

The agent task status is reported as failed with error:

classifyHandoffIfNeeded is not defined

The agent's output buffer still contains the collected data, so the parent session can read partial results, but the task is marked as failed.

Environment

• Claude Code version: 2.1.34
• Platform: Linux 6.8.0-1045-nvidia
• Model: claude-opus-4-6
• Subagent model: claude-haiku-4-5-20251001

Additional Context

The function classifyHandoffIfNeeded appears to be referenced but not defined/imported in the subagent runtime. This seems like a missing dependency or broken import in the agent handoff/completion pathway.

🤖 Generated with Claude Code