openclaw - 💡(How to fix) Fix lossless-claw: orphaned tool_use blocks in lcm.db after model switch cause permanent Anthropic API failures [1 participants]

Summary

When switching from a non-Anthropic model (e.g. MiniMax M2.7) to an Anthropic model (e.g. Claude Sonnet) mid-conversation, an orphaned `tool_use` block gets written to `lcm.db` without a corresponding `tool_result`. Every subsequent Anthropic API request for that channel then fails permanently with:

``` LLM request rejected: messages.N: tool_use ids were found without tool_result blocks immediately after: <id>. Each tool_use block must have a corresponding tool_result block in the next message. ```

Steps to Reproduce

1. Have an agent running on lossless-claw with a non-Anthropic model as primary (e.g. MiniMax)
2. Switch to an Anthropic model mid-conversation while a tool call is in flight or just completed
3. Gateway freezes or the switch interrupts the tool_use/tool_result sequence
4. Switch back or restart — the error now appears on every Anthropic request for that channel

Key Details

• The orphaned block persists in `lcm.db` across gateway restarts, session file deletion, and `sessions.json` cleanup — because lossless-claw assembles context from `lcm.db`, not from `.jsonl` files
• `repairToolUseResultPairing()` exists in `session-transcript-repair.ts` and is referenced in `TranscriptPolicy`, but does not appear to run on lossless-claw assembled context before Anthropic API calls
• The only workaround is manually deleting all records for the affected `conversation_id` from `lcm.db` across all tables (`context_items`, `message_parts`, `messages`, `conversations`, etc.) and retiring the `.jsonl` session file

Expected Behaviour

`repairToolUseResultPairing()` should run on the context assembled by lossless-claw before it's sent to any Anthropic endpoint, inserting synthetic `tool_result` blocks for any orphaned `tool_use` blocks.

Environment

• OpenClaw: 2026.3.31
• Plugin: lossless-claw (extensions/lossless-claw)
• Affected channel: Discord
• Primary model: minimax/MiniMax-M2.7
• Failing model: anthropic/claude-sonnet-4-6