`advisor_tool_result` orphaned after auto-compaction causes API 400 on next request

Bug

After auto-compaction occurs in a long session, any subsequent API call fails with:

API Error: 400 messages.N.content.0: unexpected `tool_use_id` found in
`advisor_tool_result` blocks: srvtoolu_01XRrgJHsNNK4ysNDdtpcU6k.
Each `advisor_tool_result` block must have a corresponding
`server_tool_use` block before it.

Steps to reproduce

1. Start a long session that calls advisor() one or more times.
2. Continue working until auto-compaction triggers (context approaching limit).
3. Issue any follow-up command after compaction.

Expected behavior

Compaction preserves tool_use / tool_result pairs atomically, or strips both together. The session remains usable after compaction.

Actual behavior

Compaction drops the server_tool_use block for the advisor() call but retains the advisor_tool_result block. The orphaned result block causes the Anthropic API to reject every subsequent request with a 400, making the session unrecoverable.

Environment

• Claude Code CLI
• Platform: WSL2 (Linux 6.6.87.2-microsoft-standard-WSL2)
• Orphaned tool_use_id: srvtoolu_01XRrgJHsNNK4ysNDdtpcU6k

Workaround

Start a fresh session. The broken session cannot be resumed.