Slack Desk — the message you are about to post, checked and turned into Block Kit

Paste the Slack message you are about to post — raw notes, a draft, or an existing Block Kit payload — and get it reviewed, rewritten in Slack-native mrkdwn, turned into a validated Block Kit payload, and shipped as the Bolt code that posts it. The free half runs in your browser: an mrkdwn linter for the Markdown that Slack renders literally, a Block Kit validator that checks every block type and published limit, and a real preview. Built on @anthropics/slack-messaging, @obra/slack-messaging, @claude-office-skills/slack-workflows and @sickn33/slack-bot-builder.

Every public app is built from a security-scanned skill and must pass a clean scan — skill and frontend — before it can be listed. Have a skill of your own? Turn it into an app — or read the step-by-step walkthrough.