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slack-messaging

Draft clear Slack messages using mrkdwn, Slack’s own text formatting syntax. Structure announcements and requests around the main point, format links and emphasis correctly, and choose between thread replies and channel posts based on the conversation.

OriginalShow the original description

Guidance for composing well-formatted, effective Slack messages using mrkdwn syntax

Works withSlack
See how to install

Good for

  • Drafting team announcements with clear next steps
  • Formatting emphasis, links, and mentions for Slack
  • Choosing between thread replies and channel posts
  • Shortening messages to make key points easier to scan

Files included (1)

  • SKILL.md3.1 KB

SKILL.md (original)

Review the instructions the agent will receive before you install.

Slack Messaging Best Practices

This skill provides guidance for composing well-formatted, effective Slack messages.

When to Use

Apply this skill whenever composing, drafting, or helping the user write a Slack message — including when using slack_send_message, slack_send_message_draft, or slack_create_canvas.

Slack Formatting (mrkdwn)

Slack uses its own markup syntax called mrkdwn, which differs from standard Markdown. Always use mrkdwn when composing Slack messages:

FormatSyntaxNotes
Bold*text*Single asterisks, NOT double
Italic_text_Underscores
Strikethrough~text~Tildes
Code (inline)`code`Backticks
Code block```code```Triple backticks
Quote> textAngle bracket
Link<url|display text>Pipe-separated in angle brackets
User mention<@U123456>User ID in angle brackets
Channel mention<#C123456>Channel ID in angle brackets
Bulleted list- item or • itemDash or bullet character
Numbered list1. itemNumber followed by period

Common Mistakes to Avoid

  • Do NOT use **bold** (double asterisks) — Slack uses *bold* (single asterisks)
  • Do NOT use ## headers — Slack does not support Markdown headers. Use *bold text* on its own line instead.
  • Do NOT use [text](url) for links — Slack uses <url|text> format
  • Do NOT use --- for horizontal rules — Slack does not render these

Message Structure Guidelines

  • Lead with the point. Put the most important information in the first line. Many people read Slack on mobile or in notifications where only the first line shows.
  • Keep it short. Aim for 1-3 short paragraphs. If the message is long, consider using a Canvas instead.
  • Use line breaks generously. Walls of text are hard to read. Separate distinct thoughts with blank lines.
  • Use bullet points for lists. Anything with 3+ items should be a list, not a run-on sentence.
  • Bold key information. Use *bold* for names, dates, deadlines, and action items so they stand out when scanning.

Thread vs. Channel Etiquette

  • Reply in threads when responding to a specific message to keep the main channel clean.
  • Use reply_broadcast (also post to channel) only when the reply contains information everyone needs to see.
  • Post in the channel (not a thread) when starting a new topic, making an announcement, or asking a question to the whole group.
  • Don't start a new thread to continue an existing conversation — find and reply to the original message.

Tone and Audience

  • Match the tone to the channel — #general is usually more formal than #random.
  • Use emoji reactions instead of reply messages for simple acknowledgments (though note: the MCP tools can't add reactions, so suggest the user do this manually if appropriate).
  • When writing announcements, use a clear structure: context, key info, call to action.

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