openclaw - 💡(How to fix) Fix WebChat replay drops user-visible sessions_yield messages stored only as tool results [1 pull requests]

Summary

On WebChat, a user-visible status update emitted through sessions_yield can appear live, but disappear after refresh/replay because the yielded text is persisted only inside a tool result payload rather than as durable assistant text.

Environment

• OpenClaw version: 2026.5.26
• Surface: WebChat
• Runtime: OpenAI Codex session with OpenClaw session tools

Minimal Repro

1. In a WebChat session, spawn a child/subagent with sessions_spawn.
2. Have the parent/session use sessions_yield with a user-visible status message while waiting for push-based child completion.
3. Observe that the status message appears live in WebChat.
4. Refresh/reopen/replay the session history.
5. The yielded status message is no longer visible as a normal assistant message.

Observed

The persisted transcript stores the yielded message as a tool result shape similar to:

{
  "role": "toolResult",
  "toolName": "sessions_yield",
  "content": [{
    "content": "{ \"status\": \"yielded\", \"message\": \"...\" }"
  }]
}

On replay, WebChat appears to render durable assistant messages but not this sessions_yield tool-result payload as visible assistant text. The live optimistic/streamed message is therefore replaced by the persisted snapshot and appears to disappear.

Expected

User-visible text passed to sessions_yield should be durable across transcript replay. Either:

• sessions_yield should persist a normal assistant-visible message, or
• WebChat replay should render persisted sessions_yield message payloads as visible assistant status text.

Impact

This looks like message loss to the user and is especially confusing during default subagent workflows, where OpenClaw instructs agents to rely on push completion/yield instead of polling.

Related

Possibly related to #47975, but this issue is narrower: the yielded message is visible live, then disappears on persisted WebChat replay.