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hermes - 💡(How to fix) Fix [Bug]: Feishu DM pairing mode causes random message drops under high frequency [3 comments, 2 participants]

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NousResearch/hermes-agent#20035•Fetched 2026-05-06 06:39:04
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Comments
3
Participants
2
Timeline
7
Reactions
0
Author
aaronpancnaaronpancn
Participants
aaronpancnaaronpancnkonsisumerkonsisumer
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Root Cause

Root Cause Analysis

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When using Feishu DM pairing mode, random message drops occur when messages are sent at high frequency. This can happen on either the sender or receiver side. The issue does not consistently affect a specific agent but appears randomly across multiple agents. Using "Allow all direct messages" mode does not exhibit this problem. Both modes use WebSocket connections. Steps to Reproduce

1. Configure 5 Feishu bots connected to 5 different agents/profiles
2. Set Feishu channel DM mode to DM pairing
3. Send messages at high frequency (rapid consecutive messages) in each Feishu conversation with the corresponding agent
4. Observe random message drops

Expected Behavior

Messages should be reliably delivered between Feishu and agents without random drops.

Actual Behavior

- Messages are randomly lost — either no reply received after sending, or agent's reply not delivered
- Issue is not limited to a specific agent but occurs randomly across multiple agents
- Same test under "Allow all direct messages" mode does not show this problem

Affected Component

Gateway (Telegram/Discord/Slack/WhatsApp)

Messaging Platform

Feishu / Lark

Debug Report

(Run hermes debug share in your terminal and paste the output here)

Operating System

(Your OS)

Python Version

(Run python --version)

Hermes Version

(Run hermes version)

Root Cause Analysis

Suspected to be related to WebSocket connection management or message queue handling in DM pairing mode. Under high-frequency message scenarios, certain connection reuse or session matching logic in DM pairing may have issues.

Proposed Fix

Compare the differences in WebSocket handling and message routing between DM pairing and Allow all direct messages modes to identify the code path causing the instability.

extent analysis

TL;DR

Investigate and compare the WebSocket connection management and message queue handling between DM pairing and "Allow all direct messages" modes to identify the root cause of random message drops.

Guidance

  • Review the code paths for WebSocket connection establishment, message routing, and session matching in DM pairing mode to identify potential issues with connection reuse or session logic.
  • Compare the differences in message handling between DM pairing and "Allow all direct messages" modes to understand why the issue only occurs in DM pairing mode.
  • Test the system under high-frequency message scenarios with debug logging enabled to gather more information about the message drops and potential connection or session issues.
  • Consider implementing additional logging or monitoring to track WebSocket connection establishment, message routing, and session matching in DM pairing mode.

Example

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

Notes

The root cause analysis suggests that the issue is related to WebSocket connection management or message queue handling in DM pairing mode, but further investigation is needed to identify the specific code path causing the instability.

Recommendation

Apply a workaround by using "Allow all direct messages" mode until the root cause of the issue in DM pairing mode is identified and fixed, as this mode does not exhibit the random message drop problem.

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