Slack API MCP Server
Send messages, manage channels, and integrate Slack notifications into your AI agent workflows.
Quick Start Summary
The Slack API MCP server is a Model Context Protocol bridge that connects AI assistants — including Claude Desktop, Cursor, Windsurf, and VS Code Copilot — to the Slack API API through natural language. It exposes 3 API endpoints as callable tools, such as List all channels, Send a message, List all users. Authentication requires OAuth2 credentials, and setup takes approximately 2 minutes. The server uses STDIO transport and can be installed by running npx -y @modelcontextprotocol/server-slack. This integration is sourced from the official Slack API OpenAPI specification (v2.0.0) and has a quality score of 78/99 (good documentation coverage).
Server Details
- Category
- Communication
- Authentication
- OAuth2
- Endpoints
- 3 operations
- Transport
- STDIO
- Spec Version
- v2.0.0
- Install Command
npx -y @modelcontextprotocol/server-slack
Environment Variables
SLACK_BOT_TOKENExample: xoxb-...
Top Endpoints
/conversations.listList all channels
/chat.postMessageSend a message
/users.listList all users
Build with Slack API
Get everything you need in one bundle: MCP config, cursor rules, and framework integration for Slack API.
View Slack Bot Stack→Read the Guide
Step-by-step walkthrough for setting up and using the Slack API MCP server.
Slack APIMCP Setup Guide →One-Click Install
Copy the snippet for your MCP client and paste it in — zero editing required.
Claude Desktop
Add to claude_desktop_config.json
{
"mcpServers": {
"slack": {
"command": "npx",
"args": [
"-y",
"@modelcontextprotocol/server-slack"
],
"env": {
"SLACK_BOT_TOKEN": "xoxb-..."
}
}
}
}Cursor
Settings → MCP Servers → Add
{
"mcpServers": {
"slack": {
"url": "https://mcpbridge.org/config/slack.json"
}
}
}Saves as .cursor/mcp.json in the download. Move it to your project root.
VS Code
Use with MCP extension
{
"mcpServers": {
"slack": {
"url": "https://mcpbridge.org/config/slack.json"
}
}
}Endpoints Explorer
Search and browse the 3 operations supported by this server.
Multi-Language Code Examples
Executable code snippets for calling Slack API endpoints in curl, TypeScript, or Python.
curl -X GET "https://raw.githubusercontent.com/slackapi/slack-api-specs/main/web-api/slack_web_openapi_v2.json/conversations.list" \ -H "Content-Type: application/json" \ -H "Authorization: YOUR_API_KEY"
Manual Configuration
Directly add this block to your JSON config file, or use the hosted config registry URL.
{
"mcpServers": {
"slack": {
"command": "npx",
"args": ["-y","@modelcontextprotocol/server-slack"],
"env": {
"SLACK_BOT_TOKEN": "xoxb-..."
}
}
}
}Authentication Details
This API requires OAuth2 credentials.
Variables to configure:
SLACK_BOT_TOKEN
Documentation Links
Error Handling & HTTP Status Code Matrix
Common status codes, error causes, and resolution steps when invoking Slack API endpoints.
400 Bad RequestCause: Malformed payload parameters or missing required fields.
Resolution: Verify request schema in Endpoints tab before calling tool.
401 UnauthorizedCause: Missing or invalid API key credentials.
Resolution: Set environment variable in MCP client config under env object.
403 ForbiddenCause: Insufficient scope permissions for requested resource.
Resolution: Verify key permissions in developer dashboard.
404 Not FoundCause: Resource URL path or requested entity ID does not exist.
Resolution: Check path variables and parameters.
429 Rate Limit ExceededCause: API rate limit quota exceeded.
Resolution: Implement exponential backoff retry in tool call.
500 Internal ErrorCause: Upstream server runtime fault.
Resolution: Inspect STDIO stderr output for log trace.
Quality Score
Checked against our protocol-compliance rules.
Specification Version: v2.0.0
Page compiled on: June 13, 2026
This listing has been claimed and verified by the API owner.
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