openclaw - 💡(How to fix) Fix Bug: WebChat inter-session messages displayed with user's name instead of system label [1 comments, 2 participants]

Describe the bug

In the OpenClaw webchat (Control UI), inter-session messages (specifically `subagent_announce> messages from child sessions) are rendered in the chat flow without a clear sender identifier, making them appear as if the user sent them.

Steps to Reproduce

1. Spawn a sub-agent via `sessions_spawn` from a webchat session
2. Wait for the sub-agent to complete
3. The completion announcement (`subagent_announce>) is routed back to the parent webchat session
4. In the Control UI, the announcement message appears inline with the conversation, styled/attributed as if it came from the user rather than as a system notification or assistant message

What happened

The inter-session message includes:

• `[Inter-session message] sourceSession=... sourceTool=subagent_announce isUser=false>
• Relevant memories context block
• The sub-agent result

This entire block was rendered in the chat window in a way that made the user think their own name was associated with the message.

What you expected to happen

Inter-session messages (especially `isUser=false> announcements) should be:

• Visually distinct from user messages (e.g., different background, icon, or label like "System" / "Task Result")
• Not attributed to the authenticated user
• Or at minimum, clearly marked as internal/system messages

Environment

• OpenClaw version: 2026.5.7
• Channel: webchat (Control UI)
• OS: macOS 26.4.1 (arm64)
• Node: 25.9.0

Additional context

The inter-session message envelope shows `isUser=false> and `sourceChannel=webchat>, so the metadata correctly identifies this as a non-user message. The bug is in the UI rendering layer — it does not distinguish between:

• Direct user messages
• Inter-session system messages routed to the webchat session
• Assistant replies

This causes user confusion as they see technical internal routing details and sub-agent results appearing under their own name in the chat.

Screenshots

User reported: message appeared with technical content (relevant memories, sub-agent results) in the chat window, attributed to the user's identity.

Related issues

• #66934 - WebChat sender label shows 'openclaw-control-ui' instead of 'you'
• #44153 - sessions_send from sub-agent flips parent session deliveryContext
• #51851 - WebChat UI hangs after /new — inter-session message not displayed