slack-mrkdwn
Format or debug Slack message text, mentions, links, dates, and escaping. Use when choosing Slack mrkdwn versus Markdown, richtext, or plaintext for a receiving field; not Block Kit layout or Slack history retrieval.
- Installs
- 120
- Last 24h
- —
- Trending rank
- —
- Security
- Not audited
Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/ccheney/robust-skills --skill slack-mrkdwn- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads slack-mrkdwn automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
Slack Text Formatting
Format the supplied content for the actual receiving field. The user's explicit instructions take precedence over this skill's guidelines.
Select the renderer
Use the text and destination field/method as input. Infer the destination from the existing payload; if it is unclear and changes the syntax, ask which surface receives the text. For an ordinary Slack message with no other context, state that you are using message text and mrkdwn.
| Destination | Format |
|---|---|
Message text, type: "mrkdwn" objects | Slack mrkdwn: *bold*, `<url |
markdown block, markdown_text, Work Object Markdown fields | Standard Markdown: **bold**, [label](url) |
rich_text block | Nested elements and style objects, not markup strings |
Labels or plain_text objects | Literal text |
Preserve content and controls
- Escape untrusted
&,<, and>in mrkdwn, in that order. JSON escaping is separate.verbatim: truedoes not neutralize explicit<...>controls. - Use real IDs for mentions and channels. If an ID is missing, leave a clearly labeled template value or ask for it when the output must be ready to send; do not guess from a display name.
- Preserve intended mentions and links without introducing broad notifications. Date controls need a fallback containing timezone information.
- Keep supplied fallback text complete and aligned with block content. Do not assume block rendering supplies mobile notification text.
- Check field-specific limits and method combination rules; non-streaming
markdown_textcannot be combined withtextorblockson the documented chat methods.
Return the requested formatted string, text object, or corrected payload. Preserve meaning and explain a renderer mismatch when fixing one. A formatting task can be completed without posting; send only when that action is requested or already authorized.
References
Read only the part needed for the destination or control syntax.
| Task | Reference |
|---|---|
| Markdown surfaces, text objects, rich text, Work Object text | RENDERERS.md |
| mrkdwn syntax, mentions, date tokens, escaping | SYNTAX.md |
| Links/unfurls, parse flags, notifications, legacy attachments | MESSAGE-BEHAVIOR.md |
| Compact field and syntax lookup | CHEATSHEET.md |
For changing surface support, use Slack's formatting guide and the receiving field/method reference.
FAQ
What does the slack-mrkdwn skill do?
Format or debug Slack message text, mentions, links, dates, and escaping. Use when choosing Slack mrkdwn versus Markdown, richtext, or plaintext for a receiving field; not Block Kit layout or Slack history retrieval.
How do I install slack-mrkdwn?
Run npx skills add https://github.com/ccheney/robust-skills --skill slack-mrkdwn in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/slack-mrkdwn/ (personal) or .claude/skills/slack-mrkdwn/ (project).
Which AI agents can use slack-mrkdwn?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is slack-mrkdwn safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains slack-mrkdwn?
It is published by ccheney in ccheney/robust-skills. It has 120 recorded installs.
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