c-slack

name: c-slack description: Send messages and upload files to Slack channels using the slack CLI. Supports direct messages, channel posts, file uploads, and thread replies. tags: [slack, messaging, communication, files]

What This Skill Does

Enables Claude to send messages and share files to Slack channels and users via the slack CLI tool.

Available CLI Tool: slack

Common Commands

# Send a message to a channel
slack chat send --channel "#general" --text "Hello team"

# Send a direct message to a user
slack chat send --channel "@username" --text "Hey!"

# Upload a file to a channel
slack files upload --channel "#general" --file ./report.pdf --title "Weekly Report"

# Post with markdown formatting
slack chat send --channel "#dev" --text "*Bold* and _italic_ text"

# Reply in a thread (requires thread timestamp)
slack chat send --channel "#general" --thread-ts "1234567890.123456" --text "Reply here"

# List channels
slack channels list

Usage Guidelines

• Always confirm the target channel or user before sending
• Use #channel-name syntax for channels and @username for DMs
• File uploads support PDF, images, text, and most common formats
• Keep messages concise; use threads for follow-ups

Notes

• Requires slack CLI to be installed and authenticated (slack auth)
• Bot token must have chat:write and files:write scopes
• Rate limits apply — avoid bulk sending in tight loops