From TypeScript functions to MCP tools
Reuse typed functions as MCP tools with experimental schema inference in xmcp. Generate input validation from TypeScript and JSDoc, and keep explicit schemas where you need them.
The field guides / Learn MCP
MCP guides
Learn MCP concepts, compare server frameworks, and build, secure, debug, and deploy TypeScript MCP servers with practical xmcp guides.
Ready to build? Start with installation, choose a template, or explore integrations.
Best MCP Server Frameworks in 2026: TypeScript Edition
A practical guide to the main TypeScript frameworks for building MCP servers — the official SDK, FastMCP, Vercel's mcp-handler, and xmcp — with a clear recommendation for each use case.
How to Deploy an MCP Server to Production (Vercel, Lambda, Railway)
A practical comparison of the main MCP server deployment targets — Vercel, AWS Lambda, Railway, and ECS — with the tradeoffs for each and how xmcp simplifies the Vercel path.
Best FastMCP Alternatives for TypeScript MCP Servers (2026)
Looking for alternatives to FastMCP? Here's how the main TypeScript MCP frameworks compare — and when xmcp, the official SDK, or Vercel's mcp-handler might be a better fit.
How to Debug Your MCP Server (MCP Inspector Guide)
MCP servers fail silently in ways that REST APIs don't. Here's how to use the MCP Inspector to test tools, catch protocol errors, and diagnose the most common issues.
How to Monetize Your MCP Server (x402 and Polar)
Two practical approaches to charging for MCP tool usage: x402 for per-call micropayments and Polar for subscription-based access — using xmcp integrations.
MCP Elicitation: How AI Agents Ask Users for Input Mid-Task
Learn how MCP elicitation requests user input during a tool call, which clients can handle it, and how to validate responses in an xmcp server.
How to Add Authentication to Your MCP Server
A practical guide to securing MCP server tools with OAuth 2.1 — and how xmcp's auth plugins (Better Auth, Clerk, Auth0, WorkOS, Scalekit) make it straightforward.
MCP Server: Python vs TypeScript (Which Should You Use?)
Both Python and TypeScript have official MCP SDKs. Here's how they compare on type safety, ecosystem, tooling, and the path to production — and how to choose for your team.
MCP Tools vs Resources vs Prompts: When to Use Each
MCP servers can expose three types of capabilities: tools, resources, and prompts. They're not interchangeable — each one is controlled by a different actor and used for a different purpose.
MCP vs OpenAI Function Calling: Key Differences Explained
OpenAI function calling and MCP both let AI models invoke external code — but they solve different problems. Here's how they compare and when to use each.
MCP Server vs REST API: When to Use Each
MCP servers and REST APIs both expose functionality over a network — but they're designed for different clients. Here's when to build each one, and when you need both.
MCP Clients Explained: Claude, Cursor, and the Growing Ecosystem
An MCP server is only half the picture — here's a guide to the clients (Claude Desktop, Cursor, GitHub Copilot, and others) that connect to MCP servers, and how each one works.
xmcp vs Vercel mcp-handler: Which MCP Solution Is Right for You?
A focused comparison of xmcp and Vercel's mcp-handler — two very different takes on MCP in TypeScript. One is a standalone framework; the other bolts MCP onto an existing Next.js or Nuxt app.
How to Build an MCP Server in TypeScript (2026 Guide)
A step-by-step guide to building a Model Context Protocol (MCP) server in TypeScript with xmcp: scaffold a project, write your first tool, run it locally, and connect it to Claude or Cursor.
Fix: MCP Server Won't Connect in Claude Desktop
A troubleshooting checklist for when your MCP server won't connect in Claude Desktop — transport mismatches, the mcp-remote bridge, STDIO logging, CORS, and config file mistakes.
MCP Transports Explained: STDIO vs SSE vs Streamable HTTP
A clear breakdown of MCP server transports — STDIO, the legacy HTTP+SSE transport, and Streamable HTTP — when to use each, and how xmcp configures them with a single line.
MCP "Session not found" (HTTP 404): Causes & Fixes
Why MCP clients get an HTTP 404 'Session not found' after an MCP server restarts or redeploys, what's actually happening with the Mcp-Session-Id, and how a stateless server design avoids it.
What Is an MCP Server? A Plain-English Guide
An MCP server exposes tools, resources, and prompts to AI clients over the Model Context Protocol. Here's what that means, why it matters, and how to build one with xmcp.
Integrating NestJS with xmcp
Add an MCP server to your NestJS application with tool discovery and a customizable module.
How to build an MCP App
Learn how to build an MCP App with xmcp — ship interactive React widgets, tool-rendered UIs, and ChatGPT-compatible resources with out-of-the-box support.
Securing Your MCP Server
A practical guide to authentication for MCP servers: when you need it, how it works, and which approach fits your use case.
How to submit your ChatGPT MCP app
Prepare an xmcp MCP app for OpenAI review with a deployed endpoint, accurate tool metadata, domain verification, and reproducible test cases.
Monetize your GPT apps with Stripe
Learn how to monetize your GPT apps with Stripe external checkout — set up paywalls, handle payments server-side, and gate tools behind successful charges.
Running DOOM in ChatGPT: A Step-by-Step Guide
Learn how we made DOOM playable inside ChatGPT using xmcp — rendering frames as images, streaming inputs, and shipping an MCP-powered game loop.
Connect to external MCPs and make their tools yours
Generate fully typed TypeScript MCP clients from remote HTTP servers or STDIO packages with one xmcp command, with autocomplete for tools and prompts.
Integrating Polar with xmcp
Learn how to add paywalls and track per-tool usage with Polar license keys in xmcp — gating tools, subscriptions, and metered billing for MCP servers.
Integrating Better Auth with xmcp
Learn how to add secure authentication to your xmcp MCP server using Better Auth with PostgreSQL — sessions, account linking, and OAuth 2.1 providers.
