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openclaw - 💡(How to fix) Fix Slack thread session generates responses but fails to deliver to Slack [1 comments, 2 participants]

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openclaw/openclaw#78061•Fetched 2026-05-06 06:17:20
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Slack thread sessions generate assistant responses successfully (visible in session transcript) but the responses are never delivered to Slack. Direct Slack API calls work fine, proving the issue is in OpenClaw's thread reply delivery path.

Root Cause

Slack thread sessions generate assistant responses successfully (visible in session transcript) but the responses are never delivered to Slack. Direct Slack API calls work fine, proving the issue is in OpenClaw's thread reply delivery path.

Fix Action

Fix / Workaround

Impact

  • High: Thread conversations completely broken
  • Workaround: None (responses silently lost)
  • DMs continue to work

Code Example

{"ts":"2026-05-05T20:44:55.251Z","role":"user","content":"<@U0ATVCXNC9Y> (Ghosty)"}
{"ts":"2026-05-05T20:44:57.797Z","role":"assistant","content":"I'm here, Kennan! What do you need? 🐙","stop":"stop"}
{"ts":"2026-05-05T20:45:17.193Z","role":"user","content":"<@U0ATVCXNC9Y> (Ghosty)"}
{"ts":"2026-05-05T20:45:19.611Z","role":"assistant","content":"Still here, Kennan! 🐙 You've pinged me 4 times now...","stop":"stop"}

---

[20:31:23] 👤 Kennan: <@U0ATVCXNC9Y>
[20:44:51] 👤 Kennan: <@U0ATVCXNC9Y>
[20:45:13] 👤 Kennan: <@U0ATVCXNC9Y>

---

[diagnostic] liveness warning: reasons=event_loop_delay
eventLoopDelayMaxMs=6954.2
eventLoopUtilization=0.419
RAW_BUFFERClick to expand / collapse

Bug Report: Slack Thread Session Generates Responses But Fails to Deliver

Summary

Slack thread sessions generate assistant responses successfully (visible in session transcript) but the responses are never delivered to Slack. Direct Slack API calls work fine, proving the issue is in OpenClaw's thread reply delivery path.

Environment

  • OpenClaw version: 2026.5.4 (325df3e)
  • Channel: Slack (socket mode)
  • Session type: Thread session (topic_id-based)

Reproduction

  1. Start a thread in a Slack channel (agent posts first message successfully)
  2. User replies in thread
  3. Agent generates response (visible in session transcript with stopReason: "stop")
  4. Response never appears in Slack thread
  5. Repeating pings results in same pattern: responses generated but not delivered

Evidence

Session Transcript Shows Successful Generation

{"ts":"2026-05-05T20:44:55.251Z","role":"user","content":"<@U0ATVCXNC9Y> (Ghosty)"}
{"ts":"2026-05-05T20:44:57.797Z","role":"assistant","content":"I'm here, Kennan! What do you need? 🐙","stop":"stop"}
{"ts":"2026-05-05T20:45:17.193Z","role":"user","content":"<@U0ATVCXNC9Y> (Ghosty)"}
{"ts":"2026-05-05T20:45:19.611Z","role":"assistant","content":"Still here, Kennan! 🐙 You've pinged me 4 times now...","stop":"stop"}

Slack Thread Only Has User Messages

[20:31:23] 👤 Kennan: <@U0ATVCXNC9Y>
[20:44:51] 👤 Kennan: <@U0ATVCXNC9Y>
[20:45:13] 👤 Kennan: <@U0ATVCXNC9Y>

(No bot responses between 03:19 and test message sent via direct API)

Direct Slack API Works

Manual chat.postMessage to the same thread via curl succeeded immediately, proving the Slack API and bot token are functional.

Gateway Diagnostics

At 20:39:10, gateway showed:

[diagnostic] liveness warning: reasons=event_loop_delay
eventLoopDelayMaxMs=6954.2
eventLoopUtilization=0.419

However, this doesn't explain why ONLY thread sessions fail while DM sessions work fine (user confirmed DMs in same timeframe were being delivered).

Related Issue

This may be related to #78059 (thread session reset on idle loses messages), but appears to be a separate delivery path failure rather than a session lifecycle issue.

Thread Details

  • Channel: C0AUJJW6Q3H (#ai_share)
  • Thread ts: 1777951172.213659
  • Session key: agent:main:slack:channel:c0aujjw6q3h:thread:1777951172.213659
  • Session file: 55a9502a-3efd-435b-9d35-a9ca9a3dc629-topic-1777951172.213659.jsonl

Impact

  • High: Thread conversations completely broken
  • Workaround: None (responses silently lost)
  • DMs continue to work

extent analysis

TL;DR

The issue can likely be resolved by investigating and addressing the event loop delay in the OpenClaw gateway, which may be causing the thread session responses to not be delivered to Slack.

Guidance

  • Investigate the event loop delay warning in the gateway diagnostics to determine the root cause of the delay.
  • Verify that the eventLoopUtilization and eventLoopDelayMaxMs values are within acceptable ranges.
  • Check the OpenClaw configuration and code to ensure that thread session responses are being properly handled and sent to Slack.
  • Compare the handling of thread session responses to direct messages (DMs) to identify any differences that may be contributing to the issue.

Example

No code snippet is provided as the issue does not include specific code details.

Notes

The issue may be related to #78059, but it appears to be a separate delivery path failure. The fact that DMs are working fine while thread sessions are failing suggests that the issue is specific to the thread session handling code.

Recommendation

Apply workaround: Investigate and address the event loop delay in the OpenClaw gateway, as this is the most likely cause of the issue. This may involve optimizing the event loop handling or increasing resources to reduce the delay.

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openclaw - 💡(How to fix) Fix Slack thread session generates responses but fails to deliver to Slack [1 comments, 2 participants]