Problem

When agent is busy, new messages are queued as [Queued messages while agent was busy]. These queued messages are delivered twice after agent becomes idle, causing duplicate responses.

Reproduce

1. Discord DM conversation
2. Send messages quickly
3. Observe [Queued messages] prompt
4. Agent responds twice to same message

Environment

• OpenClaw: 2026.3.2
• Platform: Raspberry Pi 5 (ARM64)
• Channel: Discord DM

Expected

Queued messages delivered once.

Actual

Queued messages delivered twice → agent responds twice.

Impact

• Duplicate responses confuse users
• Potential duplicate operation execution