[Bug] Session compaction causes tool_use_id mismatch in group chats

[msqai]

Description

After session compaction in Telegram group chats, the LLM request fails with:

LLM request rejected: messages.X.content.1: unexpected tool_use_id found in tool_result blocks: toolu_XXXXX. 
Each tool_result block must have a corresponding tool_use block in the previous message.

Steps to Reproduce

1. Add OpenClaw bot to a Telegram group
2. Have extended conversations with tool calls
3. Wait for auto-compaction to trigger (or manually /compact)
4. Try to send a new message in the group

Expected Behavior

Compaction should maintain valid tool_use/tool_result pairs or remove both together.

Actual Behavior

Compaction removes tool_use blocks but leaves orphaned tool_result blocks, which violates Anthropic API requirements.

Environment

• OpenClaw version: 2026.2.2-3
• Compaction mode: safeguard
• Channel: Telegram groups
• Model: claude-opus-4-5

Workaround

Delete the corrupted session file:

rm /root/.openclaw/agents/main/sessions/<session-id>.jsonl

Suggested Fix

During compaction, ensure tool_use and tool_result blocks are either both kept or both removed together.