/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