# C Slack

> Send messages and upload files to Slack channels using the `slack` CLI. Supports direct messages, channel posts, file uploads, and thread replies.

- Skill: `daxaur/c-slack` (Agent Skill)
- Install (CLI): `npx skillmds@latest add daxaur/c-slack`
- Raw SKILL.md: https://api.skillmd.com/api/skills/daxaur/c-slack/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Integrations & APIs
- Author: daxaur (https://skillmd.com/u/daxaur)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/daxaur/c-slack

---


## 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

```bash
# 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