slack

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Slack API integration with managed OAuth. Send messages, manage channels, search conversations, and interact with Slack workspaces. Use this skill when users want to post messages, list channels, get user info, or automate Slack workflows. For other third party apps, use the api-gateway skill (https://clawhub.ai/byungkyu/api-gateway).

modbender By modbender schedule Updated 3/6/2026
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name: slack

description: |

Slack API integration with managed OAuth. Send messages, manage channels, search conversations, and interact with Slack workspaces. Use this skill when users want to post messages, list channels, get user info, or automate Slack workflows. For other third party apps, use the api-gateway skill (https://clawhub.ai/byungkyu/api-gateway).

compatibility: Requires network access and valid Maton API key

metadata:

author: maton

version: "1.0"

clawdbot:

emoji: 🧠

requires:

  env:

    - MATON_API_KEY

Slack

Access the Slack API with managed OAuth authentication. Send messages, manage channels, list users, and automate Slack workflows.

Quick Start


# Post a message to a channel

python <<'EOF'

import urllib.request, os, json

data = json.dumps({'channel': 'C0123456789', 'text': 'Hello from Maton!'}).encode()

req = urllib.request.Request('https://gateway.maton.ai/slack/api/chat.postMessage', data=data, method='POST')

req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')

req.add_header('Content-Type', 'application/json')

print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))

EOF

Base URL


https://gateway.maton.ai/slack/{method}

The gateway proxies requests to slack.com and automatically injects your OAuth token.

Authentication

All requests require the Maton API key in the Authorization header:


Authorization: Bearer $MATON_API_KEY

Environment Variable: Set your API key as MATON_API_KEY:


export MATON_API_KEY="YOUR_API_KEY"

Getting Your API Key

  1. Sign in or create an account at maton.ai

  2. Go to maton.ai/settings

  3. Copy your API key

Connection Management

Manage your Slack OAuth connections at https://ctrl.maton.ai.

List Connections


python <<'EOF'

import urllib.request, os, json

req = urllib.request.Request('https://ctrl.maton.ai/connections?app=slack&status=ACTIVE')

req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')

print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))

EOF

Create Connection


python <<'EOF'

import urllib.request, os, json

data = json.dumps({'app': 'slack'}).encode()

req = urllib.request.Request('https://ctrl.maton.ai/connections', data=data, method='POST')

req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')

req.add_header('Content-Type', 'application/json')

print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))

EOF

Get Connection


python <<'EOF'

import urllib.request, os, json

req = urllib.request.Request('https://ctrl.maton.ai/connections/{connection_id}')

req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')

print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))

EOF

Response:


{

  "connection": {

    "connection_id": "21fd90f9-5935-43cd-b6c8-bde9d915ca80",

    "status": "ACTIVE",

    "creation_time": "2025-12-08T07:20:53.488460Z",

    "last_updated_time": "2026-01-31T20:03:32.593153Z",

    "url": "https://connect.maton.ai/?session_token=...",

    "app": "slack",

    "metadata": {}

  }

}

Open the returned url in a browser to complete OAuth authorization.

Delete Connection


python <<'EOF'

import urllib.request, os, json

req = urllib.request.Request('https://ctrl.maton.ai/connections/{connection_id}', method='DELETE')

req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')

print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))

EOF

Specifying Connection

If you have multiple Slack connections, specify which one to use with the Maton-Connection header:


python <<'EOF'

import urllib.request, os, json

data = json.dumps({'channel': 'C0123456789', 'text': 'Hello!'}).encode()

req = urllib.request.Request('https://gateway.maton.ai/slack/api/chat.postMessage', data=data, method='POST')

req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')

req.add_header('Maton-Connection', '21fd90f9-5935-43cd-b6c8-bde9d915ca80')

req.add_header('Content-Type', 'application/json')

print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))

EOF

If omitted, the gateway uses the default (oldest) active connection.

API Reference

Post Message


POST /slack/api/chat.postMessage

Content-Type: application/json



{

  "channel": "C0123456789",

  "text": "Hello, world!"

}

With blocks:


POST /slack/api/chat.postMessage

Content-Type: application/json



{

  "channel": "C0123456789",

  "blocks": [

    {"type": "section", "text": {"type": "mrkdwn", "text": "*Bold* and _italic_"}}

  ]

}

Post Thread Reply


POST /slack/api/chat.postMessage

Content-Type: application/json



{

  "channel": "C0123456789",

  "thread_ts": "1234567890.123456",

  "text": "This is a reply in a thread"

}

Update Message


POST /slack/api/chat.update

Content-Type: application/json



{

  "channel": "C0123456789",

  "ts": "1234567890.123456",

  "text": "Updated message"

}

Delete Message


POST /slack/api/chat.delete

Content-Type: application/json



{

  "channel": "C0123456789",

  "ts": "1234567890.123456"

}

List Channels


GET /slack/api/conversations.list?types=public_channel,private_channel

Get Channel Info


GET /slack/api/conversations.info?channel=C0123456789

Get Channel Members


GET /slack/api/conversations.members?channel=C0123456789&limit=100

List Messages in Channel


GET /slack/api/conversations.history?channel=C0123456789&limit=100

Get Thread Replies


GET /slack/api/conversations.replies?channel=C0123456789&ts=1234567890.123456

List Users


GET /slack/api/users.list

Get User Info


GET /slack/api/users.info?user=U0123456789

Search Messages


GET /slack/api/search.messages?query=keyword

Open DM Conversation


POST /slack/api/conversations.open

Content-Type: application/json



{

  "users": "U0123456789"

}

Add Reaction


POST /slack/api/reactions.add

Content-Type: application/json



{

  "channel": "C0123456789",

  "name": "thumbsup",

  "timestamp": "1234567890.123456"

}

Upload File


POST /slack/api/files.upload

Content-Type: multipart/form-data



channels=C0123456789

content=file content here

filename=example.txt

Auth Test

Get current user and team info:


GET /slack/api/auth.test

Code Examples

JavaScript


const response = await fetch('https://gateway.maton.ai/slack/api/chat.postMessage', {

  method: 'POST',

  headers: {

    'Content-Type': 'application/json',

    'Authorization': `Bearer ${process.env.MATON_API_KEY}`

  },

  body: JSON.stringify({ channel: 'C0123456', text: 'Hello!' })

});

Python


import os

import requests



response = requests.post(

    'https://gateway.maton.ai/slack/api/chat.postMessage',

    headers={'Authorization': f'Bearer {os.environ["MATON_API_KEY"]}'},

    json={'channel': 'C0123456', 'text': 'Hello!'}

)

Notes

  • Channel IDs start with C (public), G (private/group), or D (DM)

  • User IDs start with U, Team IDs start with T

  • Message timestamps (ts) are used as unique identifiers

  • Use mrkdwn type for Slack-flavored markdown formatting

  • Thread replies use thread_ts to reference the parent message

  • IMPORTANT: When using curl commands, use curl -g when URLs contain brackets (fields[], sort[], records[]) to disable glob parsing

  • IMPORTANT: When piping curl output to jq or other commands, environment variables like $MATON_API_KEY may not expand correctly in some shell environments. You may get "Invalid API key" errors when piping.

Error Handling

| Status | Meaning |

|--------|---------|

| 400 | Missing Slack connection |

| 401 | Invalid or missing Maton API key |

| 429 | Rate limited (10 req/sec per account) |

| 4xx/5xx | Passthrough error from Slack API |

Troubleshooting: API Key Issues

  1. Check that the MATON_API_KEY environment variable is set:

echo $MATON_API_KEY
  1. Verify the API key is valid by listing connections:

python <<'EOF'

import urllib.request, os, json

req = urllib.request.Request('https://ctrl.maton.ai/connections')

req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')

print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))

EOF

Troubleshooting: Invalid App Name

  1. Ensure your URL path starts with slack. For example:

  • Correct: https://gateway.maton.ai/slack/api/chat.postMessage

  • Incorrect: https://gateway.maton.ai/api/chat.postMessage

Resources

Install via CLI
npx skills add https://github.com/modbender/skill-library-mcp --skill slack
Repository Details
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