Summary

When sending a Markdown table via the built-in Mattermost channel plugin, OpenClaw wraps the message in fenced code blocks (```), which prevents Mattermost from rendering the table.

Mattermost itself renders the same table correctly when pasted directly into the client.

Steps to reproduce

1. Send the following message via OpenClaw → Mattermost (exact text):

| Syntax | Description |
| ----------- | ----------- |
| Header | Title |
| Paragraph | Text |

2. Observe that the delivered message is wrapped in triple backticks and appears as a code block.

Expected behavior

OpenClaw should send the table as plain Markdown (pipes) so Mattermost renders it as a table.

Actual behavior

OpenClaw wraps the table in a fenced code block, so it is not rendered as a table.

Environment

• Mattermost clients tested: Web, Desktop (Linux), Android
• Mattermost: tables render correctly when pasted directly (without OpenClaw)

Notes / Suspected cause

This looks like a Markdown renderer/IR fallback that forces table → codeBlock. For Mattermost specifically, that fallback should be disabled or made conditional since tables are supported by Mattermost clients.