Supersedes #22273 with more precise findings after investigation.

Summary

Sub-agent announcements from sessions_spawn have three compounding bugs:

1. Wrong session — delivers to the DM channel session instead of the session that spawned the sub-agent
2. ~30 minute delay — first delivery arrives ~33 min after sub-agent completion
3. Duplicate deliveries — same announcement re-delivered on subsequent drain cycles (no dedup)

Timeline (observed)

Root Cause Analysis

Wrong session

The main session (agent:main:main / 0f53fc38) spawned the sub-agent. The sub-agent's spawn response confirms:

{"childSessionKey": "agent:main:subagent:19a4b8f8-...", "note": "auto-announces on completion"}

But the announcement was never delivered to the main session. Verified by reading the full session transcript — no sub-agent result appears after the spawn.

Instead, it was delivered to agent:main:slack:channel:d0afqa1ndff — a separate DM channel session that only contains outbound messages. This session has no thread context, so messages land as top-level DMs.

Evidence from the DM channel session transcript (71b1025b):

• Line 2: Grafana research results (same bug, earlier today)
• Line 3: Ramp research results (first delivery, 15:47)
• Line 4: Ramp research results (duplicate delivery, 16:12)

Delay

The sub-agent completed at 15:14 but first delivery was at 15:47 (33 min). The announce queue appears to drain on a long interval rather than immediately on sub-agent completion.

Duplicate deliveries

The announce queue is not marking items as delivered. Each drain cycle re-sends the same announcement. Two identical Ramp research messages were delivered 25 minutes apart.

Ruled Out

• Not OrgLoop/agentctl — OrgLoop's agentctl source couldn't see any OpenClaw sessions (adapter was broken, now fixed separately). OrgLoop logs show route.no_match for all events. First misdelivery occurred before the adapter fix.
• Not manual message send — no tool call in any session transcript corresponds to these deliveries. The DM channel session only contains assistant messages with no preceding user/tool context.

Expected Behavior

1. Announce should deliver to the requester session (agent:main:main) that called sessions_spawn
2. Delivery should happen within seconds of sub-agent completion
3. Delivered announcements should be marked as delivered and not re-sent

Environment

• OpenClaw 2026.2.19 (2026.2.17 gateway)
• macOS arm64, Node 22.22.0
• Channel: Slack (socket mode)
• Spawned from main session via sessions_spawn (deep research task)