Description

When an \exec\ command produces stderr output (e.g., PowerShell warnings like \Copy-Item ... failed), the stderr content is sent as a visible reply message in Feishu, covering up the agent's actual response.

Steps to Reproduce

1. Run an \exec\ command that produces stderr output (e.g., a failed file copy)
2. Observe the Feishu chat

Actual Behavior

The stderr warning appears as a Feishu message (with ⚠️ icon), replacing or covering the agent's intended reply. See attached screenshot.

Expected Behavior

stderr output should only appear in Gateway logs, not as user-visible messages in Feishu. The agent's actual reply should be delivered normally.

Environment

• OpenClaw version: 2026.6.6
• Channel: Feishu
• OS: Windows 11

Screenshot

The stderr message (⚠️ Copy-Item ... failed) appears as a Feishu reply with the agent/model info footer, completely replacing the intended response.