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slack-usage

@majiayu000/claude-skill-registry
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This skill should be used when user asks to "search Slack for messages", "find Slack messages about X", "get channel history", "look up conversation in Slack", or "find what someone said in Slack".

Install Skill

Shared

Installs to .agents/skills, used by Codex, Amp, Warp, Cursor, OpenCode, and more.

CodexAmp
WarpCursorOpenCode
ClineGemini CLI
GitHub Copilot
Personal

Available across projects.

$npx skills-installer add @majiayu000/claude-skill-registry/slack-usage --client shared
Project

Writes to .agents/skills.

$npx skills-installer add @majiayu000/claude-skill-registry/slack-usage -p --client shared
Note: Review the skill instructions before using it.

SKILL.md

name slack-usage
description This skill should be used when user asks to "search Slack for messages", "find Slack messages about X", "get channel history", "look up conversation in Slack", or "find what someone said in Slack".

Slack Usage Best Practices

Critical Search Rule

ALWAYS use mcp__slack__slack_search_messages first for message searches. Only use mcp__slack__slack_get_channel_history when explicitly asked for recent channel history.

Search is more efficient and finds messages across all channels. Channel history only shows recent messages in one channel.

Slack API Best Practices

Rate Limiting

Slack APIs have rate limits (typically 1 request per second for most methods). When making multiple requests:

  • Space out bulk operations
  • Handle rate limit errors gracefully
  • Cache results when possible

Channel Types

  • Public channels - Visible to all workspace members
  • Private channels - Invite-only, prefix with lock icon
  • DMs - Direct messages between users
  • Group DMs - Multi-person direct conversations

Message Formatting

Format mentions and links properly:

  • User mention: <@USER_ID>
  • Channel link: <#CHANNEL_ID>
  • URL with text: <https://example.com|link text>
  • Bold: *text*
  • Code: backticks for inline, triple backticks for blocks

Threading Best Practices

  • Use threads for discussions to keep channels clean
  • Reply in thread when responding to specific messages
  • Use "Also send to channel" sparingly (only for important updates)
  • Thread replies don't trigger channel notifications by default

Bot vs User Tokens

  • Bot tokens (xoxb-): Actions appear as the bot, limited to channels bot is in
  • User tokens (xoxp-): Actions appear as user, access to all user's channels
  • Search typically requires user token for full workspace access
  • Posting messages works with either token type

Common Workflows

Finding past discussions:

  1. Search with relevant keywords
  2. Filter by channel, user, or date if needed
  3. Get thread replies for full context

Monitoring channels:

  1. Get channel history for recent activity
  2. Note message timestamps for threading
  3. React or reply as appropriate

MCP Limitations

This MCP provides read and write access to Slack. Consider:

  • Rate limits apply to all operations
  • Some admin operations not available
  • File uploads have size limits