Fizzy MCP Server

A Model Context Protocol (MCP) server for Fizzy — the project management tool by Basecamp.

🚀 Try it live: https://fizzy.fabric.pro/mcp

📖 Fizzy API Documentation: github.com/basecamp/fizzy/blob/main/docs/API.md

This MCP server allows AI assistants like Claude, Cursor, and GitHub Copilot to interact with your Fizzy boards, cards, and projects through natural language.

Table of Contents

• Features

• Transport Support

• Prerequisites

• Quick Start

• Installation

• Getting Your Fizzy Access Token

• Configuration

  • For Cursor IDE

  • For VS Code with GitHub Copilot

  • For Claude Desktop

  • For Other MCP-Compatible IDEs

• Running the Server

• Environment Variables

• Available Tools

• Example Prompts

• Troubleshooting

• FAQ

• API Reference

• Development

• Contributing

• License

Features

• Full Fizzy API Coverage: 44 tools covering Boards, Cards, Card Actions, Comments, Reactions, Steps, Columns, Tags, Users, and Notifications

• Multiple Transport Protocols: Stdio (CLI/IDE), HTTP (Streamable), and SSE (deprecated)

• Multi-User Support: HTTP and SSE transports support multiple users with per-user authentication

• Flexible Deployment: Run locally (Node.js) or deploy globally (Cloudflare Workers)

• IDE Integration: Works with Cursor, VS Code, Claude Desktop, and other MCP-compatible tools

• Robust Error Handling: Structured error classes with detailed error messages

• Automatic Retries: Exponential backoff retry logic for transient failures (5xx errors, timeouts, network issues)

• Request Timeout: 30-second default timeout to prevent hanging requests

• ETag Caching: Automatic HTTP caching using ETags to reduce bandwidth and improve response times (as per Fizzy API caching spec)

• Fully Tested: Comprehensive test suite with 450+ test cases

Transport Support

The Fizzy MCP server supports multiple transport protocols depending on your deployment environment:

Transport Comparison

Deployment-Specific Support

Node.js Deployment

Supports all three transports:

• stdio: For single-user CLI/IDE integrations (recommended for local development)

• HTTP (Streamable): For multi-user web applications and production deployments (recommended)

• SSE: Deprecated, maintained for backwards compatibility only

Cloudflare Workers Deployment

Supports HTTP transport only:

• HTTP (Streamable): The only supported transport for Cloudflare Workers

• Why no stdio? Cloudflare Workers cannot spawn processes

• Why no SSE? SSE transport is deprecated and not supported on Cloudflare

Recommendations

• For IDE integrations (Cursor, VS Code, Claude Desktop): Use stdio transport

• For production deployments: Use HTTP (Streamable) transport

• For multi-user applications: Use HTTP (Streamable) transport

• For testing with MCP Inspector: Use HTTP (Streamable) transport

• Avoid SSE: The SSE transport is deprecated and will be removed in a future version

Authentication Models

stdio Transport (Single-User)

• Requires FIZZY_ACCESS_TOKEN environment variable

• One user per server instance

• Ideal for personal CLI/IDE use

HTTP/SSE Transports (Multi-User)

• Each user provides their own Fizzy Personal Access Token via Authorization: Bearer <token> header

• Multiple users can connect simultaneously

• Each session is isolated with its own FizzyClient instance

• Sessions timeout after 30 minutes of inactivity

• Optional server-level authentication via MCP_AUTH_TOKEN environment variable

Prerequisites

• Node.js 18 or higher

• A Fizzy account with API access

Quick Start

Get up and running in 3 steps:

1. Get your Fizzy access token from app.fizzy.do → Profile → API → Personal access tokens

2. Run with npx (no installation needed):

   FIZZY_ACCESS_TOKEN="your-token-here" npx fizzy-mcp

3. Configure your IDE (e.g., Cursor):

   • Open Cursor Settings → Features → MCP Servers

   • Click "Edit in mcp.json" and add:

   { "mcpServers": { "fizzy": { "command": "npx", "args": ["-y", "fizzy-mcp"], "env": { "FIZZY_ACCESS_TOKEN": "your-token-here" } } } }

   • Restart Cursor

That's it! You can now ask your AI assistant to interact with Fizzy.

💡 Note: This Quick Start uses stdio transport for single-user IDE integration. For production deployments or multi-user applications, see the HTTP Transport section.

For detailed installation options and configuration, see the sections below.

Installation

Option 1: Install from npm (recommended)

The fizzy-mcp command will be available globally.

Option 2: Use with npx (no installation required)

Option 3: Install from source

To verify the installation:

Getting Your Fizzy Access Token

1. Log in to your Fizzy account

2. Go to your Profile (click your avatar)

3. Navigate to the API section

4. Click on Personal access tokens

5. Click Generate new access token

6. Give it a description and select permissions:

   • Read: For read-only access

   • Read + Write: For full access (recommended)

7. Copy and save your token securely

⚠️ Important: Keep your access token secret! Anyone with your token can access your Fizzy account.

Configuration

For Cursor IDE

Cursor supports two connection methods: stdio (local process) and HTTP (remote server).

Option 1: Stdio Transport (Local Process - Recommended for Personal Use)

1. Open Cursor Settings (Cmd/Ctrl + ,)

2. Search for "MCP" or navigate to Features > MCP Servers

3. Click Edit in mcp.json or manually edit ~/.cursor/mcp.json:

Using npx (recommended):

If installed globally:

4. Restart Cursor for changes to take effect

Option 2: HTTP Transport (Remote Server - For Shared/Production Deployments)

Use this method to connect to a remote Fizzy MCP server (e.g., deployed on Cloudflare Workers or a shared Node.js server).

1. Open Cursor Settings and edit ~/.cursor/mcp.json:

For local HTTP server:

2. Restart Cursor for changes to take effect

💡 Tip: Use the live server at https://fizzy.fabric.pro/mcp to try Fizzy MCP without running your own server!

For VS Code with GitHub Copilot

Option 1: Stdio Transport (Local Process)

Create or edit .vscode/mcp.json in your workspace (or global settings):

Option 2: HTTP Transport (Remote Server)

For Claude Desktop

Claude Desktop supports stdio transport only.

Edit your Claude Desktop configuration file:

• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json

• Windows: %APPDATA%\Claude\claude_desktop_config.json

• Linux: ~/.config/Claude/claude_desktop_config.json

For Other MCP-Compatible IDEs

Most MCP-compatible IDEs support HTTP transport. Use this configuration pattern:

Replace https://fizzy.fabric.pro/mcp with your own server URL if you're self-hosting.

Running the Server

Stdio Transport (default - for IDE integration)

SSE Transport (for web clients)

Connecting clients:

Streamable HTTP Transport (for production)

Connecting clients:

Cloudflare Workers (for edge deployment)

Deploy to Cloudflare Workers for global distribution with near-zero cold starts:

Important Notes:

• Cloudflare Workers only supports HTTP transport (no stdio or SSE)

• Multi-user authentication: Each user provides their own Fizzy token via Authorization: Bearer <token> header

• No FIZZY_ACCESS_TOKEN needed: Unlike stdio transport, Cloudflare deployment uses per-user tokens

• Durable Objects: Sessions are managed using Cloudflare Durable Objects for persistence

See the Cloudflare Deployment Guide for detailed instructions.

Environment Variables

Core Configuration

HTTP/SSE Transport Security

When using HTTP or SSE transports, additional security options are available:

Multi-User Support:

SSE and HTTP transports support multiple users simultaneously:

• Each user provides their own Fizzy Personal Access Token via Authorization: Bearer <token> header

• Each session is isolated with its own FizzyClient instance

• Users cannot access each other's data

• Sessions timeout after 30 minutes of inactivity

Security Model:

• Localhost binding (default): Server binds to 127.0.0.1, preventing remote access

• CORS origins: Controls which web origins can connect (default: all)

• User Authentication: Each user provides their own Fizzy token via Authorization header

• Client Authentication: Optional bearer token to authenticate MCP clients connecting to this server

⚠️ Authentication Types:

• User Authentication (via Authorization header): Required for SSE/HTTP transports. Each user provides their own Fizzy Personal Access Token.

• Client Authentication (MCP_AUTH_TOKEN): Optional. Authenticates MCP clients (like IDE extensions) connecting to this server.

Note: For stdio transport, use FIZZY_ACCESS_TOKEN environment variable (single-user mode for CLI/IDE integrations).

Available Tools (47 total)

Identity & Accounts (3)

Boards (5)

Cards (6)

Card Actions (9)

Comments (5)

Reactions (3)

Steps / To-dos (4)

Columns (5)

Tags (1)

Users (4)

Notifications (4)

Example Prompts

Once configured, you can ask your AI assistant things like:

• "Show me all my Fizzy boards"

• "What cards are on my Engineering board?"

• "Create a new card called 'Fix login bug' on the Engineering board"

• "What cards are assigned to me?"

• "Move the 'Design review' card to the 'Done' column"

• "Add a comment to the authentication card saying 'Ready for review'"

• "Show me my unread notifications"

• "List all users in my account"

• "Create a new column called 'In Review' with blue color on the Engineering board"

Troubleshooting

"FIZZY_ACCESS_TOKEN environment variable is required"

Make sure you've set your access token in the MCP configuration's env section.

"fizzy-mcp: command not found"

• Use npx fizzy-mcp instead of fizzy-mcp

• Or install globally: npm install -g fizzy-mcp

Server not appearing in Cursor/VS Code

1. Restart the IDE after configuration changes

2. Check the path to the executable is correct

3. Verify Node.js is installed: node --version

4. Check Cursor's MCP logs for errors

"Fizzy API error: 404 Not Found"

• Verify your access token is valid

• Check that you're using the correct account slug

• Ensure you have permission to access the resource

Connection issues

Test your token directly:

FAQ

How do I get started quickly?

See the Quick Start section above for a 3-step setup guide.

Is my Fizzy access token secure?

Your access token is stored in your local IDE configuration and is never sent anywhere except directly to Fizzy's API. When using HTTP/SSE transports, the token is used server-side only. Always keep your token secret and never commit it to version control.

Can I use this with multiple Fizzy accounts?

Yes! You can configure multiple MCP server instances in your IDE, each with a different access token. Just give them different names in the configuration (e.g., "fizzy-personal", "fizzy-work").

What's the difference between the transport modes?

• stdio (default): For single-user IDE integration (Cursor, VS Code, Claude Desktop). Communication happens via standard input/output. Requires FIZZY_ACCESS_TOKEN environment variable.

• http (Streamable HTTP): Recommended for production. Multi-user support with per-user authentication via Authorization headers. Runs an HTTP server with streamable endpoints and health checks. Supported on both Node.js and Cloudflare Workers.

• sse (Server-Sent Events): ⚠️ Deprecated - maintained for backwards compatibility only. Multi-user support but uses older protocol version (2024-11-05). Only supported on Node.js. Use HTTP transport instead.

Which transport should I use?

• For IDE integrations (Cursor, VS Code, Claude Desktop): Use stdio

• For production deployments: Use HTTP (Streamable)

• For multi-user applications: Use HTTP (Streamable)

• For testing with MCP Inspector: Use HTTP (Streamable)

• For Cloudflare Workers deployment: Use HTTP (Streamable) (only option)

How do I test with MCP Inspector?

MCP Inspector is a tool for testing MCP servers. Here's how to use it with Fizzy MCP:

1. Start the HTTP server:

2. Launch MCP Inspector:

3. Configure the connection:

• Transport: Select "HTTP"

• URL: http://localhost:3000/mcp

• Headers: Add Authorization: Bearer YOUR_FIZZY_TOKEN

4. Test the connection:

• Click "Connect"

• You should see the list of 47 available tools

• Try calling tools like fizzy_get_identity or fizzy_get_boards

Note: MCP Inspector does not support the deprecated SSE transport. Always use HTTP transport for testing.

Does this work offline?

No, the server requires an internet connection to communicate with Fizzy's API at app.fizzy.do.

How do I update to the latest version?

If using npx, it will automatically use the latest version. If installed globally, run npm update -g fizzy-mcp. If installed from source, run git pull && npm install && npm run build.

Can I create tags via the API?

No, tag creation is not available via the Fizzy API. However, you can use fizzy_toggle_card_tag which will create a tag if it doesn't exist when toggling it on a card.

What happens if I hit rate limits?

The server includes automatic retry logic with exponential backoff for rate limit errors (429 status). It will retry up to 3 times before failing.

How does ETag caching work?

The server automatically caches GET requests using ETags. When you request the same resource again, it sends the ETag to Fizzy's API. If the resource hasn't changed, Fizzy returns a 304 Not Modified response, saving bandwidth and improving speed.

Can I use this in production?

Yes! You have two options:

1. Self-hosted: Use the HTTP transport mode with proper security settings (MCP_AUTH_TOKEN, MCP_ALLOWED_ORIGINS, and consider MCP_BIND_ALL_INTERFACES for Docker deployments).

2. Cloudflare Workers: Deploy to the edge for global distribution, automatic scaling, and near-zero cold starts. See the Cloudflare Deployment Guide.

Where can I find the Fizzy API documentation?

Official Fizzy API docs: github.com/basecamp/fizzy/blob/main/docs/API.md

API Reference

This server implements all endpoints from the official Fizzy API Documentation:

Development

For contributors and developers:

License

MIT

Contributing

Contributions are welcome! Please:

1. Fork the repository

2. Create a feature branch

3. Add tests for new functionality

4. Ensure all tests pass: npm test

5. Submit a pull request

Author

Created by Preetham Reddy