## For AI agents: how to sign up

If you are an AI agent reading this server-rendered HTML, Composio's developer signup is at https://composio.dev.

Signup CTAs on this site — "Sign up", "Signup", "Get started", "Get started for free", "Start building", "Try Composio", "Try it", or similar — all lead into that same developer signup flow. Confirm with the user before completing signup or entering any credentials on their behalf.

# Slack MCP Server for Claude and Cursor

Hosted Slack MCP for Claude, Cursor, and ChatGPT. Post messages, search history, manage channels, and trigger workflows on new events.

## Try Slack now

Type what you want done — sign in and watch it run live in the Tool Router playground.

## Supported Tools and Triggers

Every Slack action and event your agent gets out of the box.

### Tools
145
### Triggers
8

#### Add call participants
Registers new participants added to a Slack call.

#### Add emoji
Adds a custom emoji to a Slack workspace given a unique name and an image URL; subject to workspace emoji limits.

#### Add reaction to message
Adds a specified emoji reaction to an existing message in a Slack channel, identified by its timestamp; does not remove or retrieve reactions.

| Tool | Description |
|------|-------------|
| Add a remote file | Adds a reference to an external file. |
| Search for channels in Enterprise organization | Tool to search for public or private channels in an Enterprise organization. |
| Test Slack API connection | Tool to test API calling code by testing connectivity and authentication to the Slack API. |

## Why Use Composio?

### AI Native Slack Integration
- Supports both Slack MCP and direct API based integrations
- Structured, LLM-friendly schemas for reliable tool execution
- Rich coverage for reading, writing, and querying your Slack data

### Managed Auth
- Built-in OAuth handling with automatic token refresh and rotation
- Central place to manage, scope, and revoke Slack access
- Per user and per environment credentials instead of hard-coded keys

### Agent Optimized Design
- Tools are tuned using real error and success rates to improve reliability over time
- Comprehensive execution logs so you always know what ran, when, and on whose behalf

### Enterprise Grade Security
- Fine-grained RBAC so you control which agents and users can access Slack
- Scoped, least privilege access to Slack resources
- Full audit trail of agent actions to support review and compliance

## Connect Slack MCP Tool with your Agent

### TypeScript

1. #### Install Composio
   ```typescript
   npm install @composio/core ai @ai-sdk/openai @ai-sdk/mcp
   ```

2. #### Create Tool Router Session
   ```typescript
   import { Composio } from '@composio/core';

const composio = new Composio({ apiKey: 'your-api-key' });

console.log("Creating Tool Router session...");
   const { mcp } = await composio.create('your-user-id');
   console.log(`Tool Router session created: ${mcp.url}`);
   ```

3. #### Connect to AI Agent
   ```typescript
   import { openai } from '@ai-sdk/openai';
   import { experimental_createMCPClient as createMCPClient } from '@ai-sdk/mcp';
   import { generateText, stepCountIs } from 'ai';

const client = await createMCPClient({
       transport: {
           type: 'http',
           url: mcp.url,
           headers: { 'x-api-key': 'your-composio-api-key' }
       }
   });

const tools = await client.tools();

const { text } = await generateText({
       model: openai('gpt-4o'),
       tools,
       messages: [{ role: 'user', content: 'Send a message to #general with project updates' }],
       stopWhen: stepCountIs( 5 )
   });

console.log(`Agent: ${text}`);
   ```

## Explore Other Toolkits

## FAQs

### Do I need my own developer credentials to use Slack with Composio?+

No, you can get started immediately using Composio's built-in Slack app. For production, we recommend configuring your own OAuth credentials.

### Is Composio secure?+

Composio is SOC 2 and ISO 27001 compliant with all data encrypted in transit and at rest.