slack-messaging
Use when asked to send or read Slack messages, check Slack channels, test Slack integrations, or interact with a Slack workspace from the command line.
- Installs
- 223
- Last 24h
- —
- Trending rank
- —
- Security
- Not audited
Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/obra/superpowers-lab --skill slack-messaging- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads slack-messaging automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
Slack Messaging via slackcli
Send and read Slack messages from the command line using slackcli (shaharia-lab/slackcli).
Installation
Download the binary:
curl -sL -o /usr/local/bin/slackcli \
"https://github.com/shaharia-lab/slackcli/releases/download/v0.1.1/slackcli-linux"
chmod +x /usr/local/bin/slackcli
macOS (Intel): replace slackcli-linux with slackcli-macos
macOS (Apple Silicon): replace with slackcli-macos-arm64
Authentication
slackcli uses browser session tokens (xoxc + xoxd) - no Slack app creation required.
Interactive Setup
./scripts/extract-tokens <workspace-url>
This walks the user through extracting tokens from browser DevTools.
Manual Setup
slackcli auth login-browser \
--xoxd="xoxd-..." \
--xoxc="xoxc-..." \
--workspace-url=https://your-workspace.slack.com
Verify Auth
slackcli auth list
Finding Channels
Use slackcli conversations list to discover channels and their IDs:
# List all channels
slackcli conversations list
# Filter output
slackcli conversations list | grep -i "channel-name"
Sending Messages
# Send to a channel (use channel ID from conversations list)
slackcli messages send --recipient-id=C0XXXXXXXX --message="Hello from CLI"
# Send to a DM (use user's DM channel ID)
slackcli messages send --recipient-id=D0XXXXXXXX --message="Hey"
# Reply in a thread
slackcli messages send --recipient-id=C0XXXXXXXX --message="Thread reply" --thread-ts=1769756026.624319
The --recipient-id is always a channel ID (C...) or DM channel ID (D...).
Reading Messages
# Read last N messages from a channel
slackcli conversations read C0XXXXXXXX --limit=10
# Read as JSON (for parsing)
slackcli conversations read C0XXXXXXXX --limit=10 --json
# Read a thread
slackcli conversations read C0XXXXXXXX --thread-ts=1769756026.624319
Listing Channels
slackcli conversations list
Returns all public channels, private channels, and DMs with their IDs.
Testing Slack Integrations
To verify a bot or integration posted a message correctly:
# Read the channel, check for the expected message
slackcli conversations read CHANNEL_ID --limit=5 --json | jq '.messages[] | select(.text | contains("expected text"))'
To send a test message and verify the round-trip:
# Send
slackcli messages send --recipient-id=CHANNEL_ID --message="integration test $(date +%s)"
# Read back
slackcli conversations read CHANNEL_ID --limit=1 --json
Multiple Workspaces
slackcli supports multiple workspaces. Run the auth flow for each workspace you need:
# Add first workspace
./scripts/extract-tokens https://workspace-one.slack.com
# Add second workspace
./scripts/extract-tokens https://workspace-two.slack.com
# List all authenticated workspaces
slackcli auth list
When sending messages, slackcli automatically routes to the correct workspace based on the channel ID.
Token Notes
- Browser tokens (xoxc/xoxd) act as the logged-in user, not a bot
- Messages sent appear as the user, not an app
- Tokens expire when the user logs out of the browser session
- To refresh: re-extract tokens from a logged-in browser session
- All workspace credentials are stored at
~/.config/slackcli/workspaces.json
FAQ
What does the slack-messaging skill do?
Use when asked to send or read Slack messages, check Slack channels, test Slack integrations, or interact with a Slack workspace from the command line.
How do I install slack-messaging?
Run npx skills add https://github.com/obra/superpowers-lab --skill slack-messaging in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/slack-messaging/ (personal) or .claude/skills/slack-messaging/ (project).
Which AI agents can use slack-messaging?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is slack-messaging safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains slack-messaging?
It is published by obra in obra/superpowers-lab. It has 223 recorded installs.
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