Summary

Control UI leaks internal async completion / heartbeat system messages into the user-visible chat instead of handling them silently.

What happened

After a background/async command completion event, the chat displayed internal system text such as:

• An async command completion event was triggered, but user delivery is disabled for this run.
• Handle the result internally and reply HEARTBEAT_OK only.
• Current time: ...
• HEARTBEAT_OK

This looks like internal orchestration text that should never be rendered in the normal conversation UI.

Why this is a problem

• Exposes internal control/runtime instructions to end users
• Confusing and alarming in normal chat usage
• Makes the assistant appear broken even when the underlying run finished successfully

Expected behavior

Async completion / heartbeat-only system events should be consumed internally and should not appear in the user-visible conversation.

Actual behavior

The raw/internal system messages were rendered in Control UI chat bubbles.

Environment

• OpenClaw app: 2026.4.24
• Channel/surface: webchat / Control UI
• Runtime observed in session: openai-codex/gpt-5.4
• OS: macOS (observed on a local gateway setup)

Repro idea

I do not have a minimal deterministic repro yet, but this was observed right after an async command completion event in Control UI. It appears related to the path where user delivery is disabled for the completion event, but the UI still renders the associated internal message.

Notes

This may be the same class of issue as other internal event/rendering leaks, but I could not find an obvious duplicate from a quick search.