MCP Fusion
MCP Fusion - The TypeScript framework for secure MCP servers.
What is MCP Fusion?
MCP Fusion is a Model Context Protocol (MCP) server that allows AI assistants like Claude, Cursor, and VS Code to mcp fusion - the typescript framework for secure mcp servers.
MCP Fusion - The TypeScript framework for secure MCP servers.
This server falls under the Developer Tools category on MCPgee, the world's largest MCP server directory with 33,000+ servers.
Features
- MCP Fusion - The TypeScript framework for secure MCP servers
Use Cases
Maintainer
Works with
Installation
Manual Installation
npx mcpfusionConfiguration
Configuration Details
claude_desktop_config.json
Performance
Response Metrics
Resource Usage
How to Set Up and Use MCP Fusion
MCP Fusion is a TypeScript framework for building production-ready, secure MCP servers with built-in governance, security modules, and multiple deployment targets including Vercel, Cloudflare Workers, and Vinkius Edge. It provides three authoring styles — declarative YAML, typed TypeScript with defineModel/definePresenter, and finite state machine (FSM) workflows — and ships with generators that convert OpenAPI specs, Prisma schemas, and n8n workflows directly into MCP tools. Developers choose MCP Fusion when they need enterprise-grade security guardrails like egress firewalls, Zod schema validation, V8 sandbox isolation, and LLM-as-Judge prompt filtering alongside rapid MCP server scaffolding.
Prerequisites
- Node.js runtime with npm installed
- TypeScript 5.7 or higher for TypeScript authoring mode
- An MCP client such as Claude Desktop or Claude Code to connect to the server
- A deployment target account if deploying remotely: Vercel, Cloudflare (wrangler), or Vinkius Edge
- Optional: Prisma schema or OpenAPI spec if using code generators
Scaffold a new MCP Fusion server
Use the mcpfusion CLI to create a new server project. The tool sets up the directory structure, TypeScript config, and example tool definitions automatically.
npx @mcpfusion/core create my-server
cd my-server
npm run devChoose an authoring style
MCP Fusion supports YAML for zero-code declarative tools, TypeScript for full type safety, and FSM for enforced workflow state machines. Start with YAML for simplicity.
# tools/search.yaml
tools:
- name: search_repos
parameters:
query: { type: string, required: true }
execute:
connection: github
method: GET
path: "/search/repositories"
query: { q: "{{query}}", per_page: "10" }Configure secrets and connections
Secrets are referenced using the ${SECRETS.*} syntax in YAML config or injected via environment variables. Never hard-code API tokens.
# connections.yaml
connections:
github:
auth:
type: bearer
token: "${SECRETS.GITHUB_TOKEN}"Enable security modules
Add security guardrails including Zod-validated egress firewall, PromptFirewall (LLM-as-Judge), and SandboxEngine (V8 isolates) to protect against prompt injection and data exfiltration.
// src/presenters/SafePresenter.ts
import { definePresenter } from '@mcpfusion/core';
export const SafePresenter = definePresenter({
egress: { schema: z.object({ result: z.string() }) },
sandbox: true,
promptFirewall: { model: 'claude-3-haiku' }
});Generate tools from existing schemas
Use built-in generators to auto-create MCP tools from a Prisma schema, OpenAPI spec, or n8n workflow to avoid hand-writing repetitive tool definitions.
# Scaffold from Prisma
npx @mcpfusion/core create db-server --vector prisma
# Scaffold from OpenAPI
npx @mcpfusion/core create api-server --vector openapi
# Scaffold with n8n bridge
npx @mcpfusion/core create ops-bridge --vector n8nDeploy to your target environment
Deploy the finished server to Vercel Functions, Cloudflare Workers, or Vinkius Edge using the respective deployment tool.
# Vercel
vercel deploy
# Cloudflare Workers
wrangler deploy
# Vinkius Edge
mcpfusion deployMCP Fusion Examples
Client configuration
Claude Desktop config for a locally running MCP Fusion development server. Replace the port if your dev server uses a different one.
{
"mcpServers": {
"mcpfusion-local": {
"command": "npx",
"args": ["@mcpfusion/core", "dev"],
"env": {
"GITHUB_TOKEN": "ghp_YOUR_TOKEN_HERE"
}
}
}
}Prompts to try
Example prompts once the MCP Fusion server is connected and tools are registered
- "Search GitHub for TypeScript MCP server repositories"
- "List all tools this server exposes"
- "Run the search_repos tool with query 'model context protocol'"
- "Show me the current FSM state for the onboarding workflow"Troubleshooting MCP Fusion
TypeScript compilation errors after scaffolding
Ensure TypeScript 5.7+ is installed. Run npm install inside the project directory and verify tsconfig.json sets 'strict: true' and 'moduleResolution: bundler'.
Secrets not resolving (${SECRETS.MY_KEY} appears literally)
Set the corresponding environment variable before starting the server. In local dev, add a .env file at the project root and ensure it is loaded. On Cloudflare Workers, use wrangler secret put MY_KEY.
Deployment fails with permission error on Vinkius Edge
Run mcpfusion login to authenticate your Vinkius account first. Confirm your project is linked with mcpfusion link and that billing is active on the Vinkius dashboard.
Frequently Asked Questions about MCP Fusion
What is MCP Fusion?
MCP Fusion is a Model Context Protocol (MCP) server that mcp fusion - the typescript framework for secure mcp servers. It connects AI assistants to external tools and data sources through a standardized interface.
How do I install MCP Fusion?
Follow the installation instructions on the MCP Fusion GitHub repository. Clone the repo, install dependencies, and add the server config to your AI client.
Which AI clients work with MCP Fusion?
MCP Fusion works with all major MCP-compatible AI clients including Claude Desktop, Claude Code, Cursor, VS Code (GitHub Copilot), Windsurf, and Cline.
Is MCP Fusion free to use?
Yes, MCP Fusion is open source and available under the Apache-2.0 license. You can use it freely in both personal and commercial projects.
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Quick Config Preview
Add this to your claude_desktop_config.json or .cursor/mcp.json
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