Description

The [[reply_to_current]] reply tag (documented in the system prompt as a way to create native replies/quotes) does not produce threaded replies on Mattermost. The message is sent as a new top-level message in the DM channel instead of a thread reply to the triggering message.

Workaround

Using the message tool with the replyTo parameter and an explicit message ID does work correctly — the message lands in a thread as expected.

Steps to Reproduce

1. Receive a DM on Mattermost
2. Reply with [[reply_to_current]] some text
3. Message arrives as a new top-level message, not a thread reply

Expected Behavior

The message should be posted as a thread reply (using Mattermost root_id) to the message that triggered the agent turn.

Environment

• OpenClaw 2026.2.23
• Mattermost channel