Slack

Name: slack
Rating: 88
Author: jholhewres

Interact with Slack workspaces using the Slack Web API.

Setup

•Create a Slack App at https://api.slack.com/apps
•Add Bot Token Scopes: chat:write, channels:read, users:read
•Install to workspace and copy the Bot User OAuth Token

•Set environment variable:

bash

export SLACK_BOT_TOKEN="xoxb-your-token"

Send Messages

bash

# Send message to channel
curl -s -X POST "https://slack.com/api/chat.postMessage" \
  -H "Authorization: Bearer $SLACK_BOT_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"channel": "C12345678", "text": "Hello from goclaw!"}'

# Send to user (DM)
curl -s -X POST "https://slack.com/api/chat.postMessage" \
  -H "Authorization: Bearer $SLACK_BOT_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"channel": "@username", "text": "Direct message"}'

# Send with blocks (rich formatting)
curl -s -X POST "https://slack.com/api/chat.postMessage" \
  -H "Authorization: Bearer $SLACK_BOT_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "channel": "C12345678",
    "blocks": [
      {"type": "section", "text": {"type": "mrkdwn", "text": "*Bold text*"}}
    ]
  }'

List Channels

bash

# List public channels
curl -s "https://slack.com/api/conversations.list?types=public_channel" \
  -H "Authorization: Bearer $SLACK_BOT_TOKEN" | jq '.channels[] | {id, name, num_members}'

# List all channels (including private)
curl -s "https://slack.com/api/conversations.list?types=public_channel,private_channel" \
  -H "Authorization: Bearer $SLACK_BOT_TOKEN" | jq '.channels[] | {id, name}'

List Users

bash

# List workspace members
curl -s "https://slack.com/api/users.list" \
  -H "Authorization: Bearer $SLACK_BOT_TOKEN" | jq '.members[] | {id, name, real_name}'

Read Messages

bash

# Get recent messages from channel
curl -s "https://slack.com/api/conversations.history?channel=C12345678&limit=10" \
  -H "Authorization: Bearer $SLACK_BOT_TOKEN" | jq '.messages[] | {user, text, ts}'

Thread Replies

bash

# Reply in a thread
curl -s -X POST "https://slack.com/api/chat.postMessage" \
  -H "Authorization: Bearer $SLACK_BOT_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"channel": "C12345678", "thread_ts": "1234567890.123456", "text": "Thread reply"}'

Add Reactions

bash

# Add emoji reaction
curl -s -X POST "https://slack.com/api/reactions.add" \
  -H "Authorization: Bearer $SLACK_BOT_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"channel": "C12345678", "timestamp": "1234567890.123456", "name": "thumbsup"}'

Tips

•Channel IDs start with C, user IDs start with U, DM channel IDs start with D
•Use @username to send DMs without knowing the channel ID
•Check response ok field for success: .ok == true
•Rate limit: ~1 request/second for most methods

Triggers

slack, send slack message, slack channel, slack dm, slack notification, notify team, post to slack