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MCP server frameworks compared: FastMCP vs mcp-use vs the official Python and TypeScript SDKs

Four ways to build an MCP server in 2026: the official Python SDK (v2) and TypeScript SDK (v2), Prefect's FastMCP and Manufact's mcp-use. Covers languages, schemas, transports, auth, MCP Apps (UI), local testing, deployment and license.

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MCP server frameworks compared: FastMCP vs mcp-use vs the official Python and TypeScript SDKs
EntryLanguage and packageDefining a toolTransportsServer authMCP Apps (UI)Local testingDeploy storyLicense
MCP Python SDKPython; PyPI mcp 2.3.0 (README: Python 3.11+). v2 API: from mcp.server import MCPServer@mcp.tool() on a type-hinted function; schema and validation generated from the hintsstdio, Streamable HTTP and SSE; the same package includes a full ClientResource-server pattern: implement TokenVerifier to check OAuth 2.1 bearer tokens; client-side OAuth helpersYes, as the built-in Apps extension (io.modelcontextprotocol/ui)mcp dev server.py opens the server in MCP Inspector (cli extra)Any host that runs a Python web service; mcp run --transport streamable-httpMIT
MCP TypeScript SDKTypeScript on Node.js, Bun and Deno; v2 @modelcontextprotocol/server 2.4.0 and @modelcontextprotocol/client (Node >=20). v1 @modelcontextprotocol/sdk 1.32.2 on the v1.x branchserver.registerTool(name, {inputSchema}, handler); schemas via Standard Schema (Zod v4, Valibot, ArkType)stdio and Streamable HTTP; thin middleware for Node http, Express, Fastify and HonoBearer-token verification with protected-resource metadata and per-operation scopes; client OAuth and machine auth (client credentials, private-key JWT, cross-app access)Not listed in the v2 docs indexNone built in; use MCP InspectorAny JS runtime; you wire the HTTP frameworkApache-2.0 for v2 (repo is moving from MIT to Apache-2.0; v1 package MIT)
FastMCPPython; PyPI fastmcp 4.1.3 (Python >=3.10). TypeScript counterpart: @prefecthq/fastmcp-ts@mcp.tool on a plain function; schema, validation and docs generatedstdio and HTTP; clients connect by URL with transport negotiation handledAPI keys up to full OAuth 2.1: token verification, remote OAuth (Descope, WorkOS, Auth0, SSO), OAuth and OIDC proxies, a full OAuth server, multiple auth sources, component-level authorizationYes (Apps pillar: interactive UIs rendered in the conversation)FastMCP Client connects to any server, programmatically or from the CLI; docs cover AI-assisted developmentHTTP deployment, fastmcp.json project config; Prefect Horizon (commercial gateway and hosting from the same team)Apache-2.0
mcp-useTypeScript first (npm mcp-use 2.11.2, Node >=22.22.2; scaffold with create-mcp-use-app) plus a Python package (PyPI mcp-use 1.7.1)server.tool({name, inputSchema, outputSchema, view}, handler) with Zod; typed structured resultsStreamable HTTP servers; Redis-backed session storage for distributed deploymentsOAuth providers: Auth0, Better Auth, Clerk, Keycloak, Supabase, WorkOS, an OAuth proxy, or custom DCRYes: React Views bound to tools (ChatGPT apps, Claude connectors)Built-in Inspector at /mcp/inspector in dev, plus a hosted Inspector and headless CLIManufact Cloud (one-click), Google Cloud Run and other hostsMIT

Verdict: Writing Python and want the reference implementation with few dependencies? Use the official SDK v2, which now has MCPServer, a client and MCP Apps. Need production auth (OAuth proxies, SSO, multiple token sources) in Python? FastMCP has the most auth options. In TypeScript, use the official v2 SDK when you want Standard Schema and your own HTTP framework. Pick mcp-use when you're building an MCP App with React views and want an inspector and deploy flow out of the box.

Each of these four turns a function into an MCP tool. They differ in everything around that: auth, UI, testing and deployment. The official SDKs track the spec and keep dependencies light. FastMCP and mcp-use add batteries on top.

The official SDKs grew up

Both official SDKs shipped a v2 in 2026, and they look much more like the frameworks than v1 did:

There is also an official Go SDK, maintained with Google, if Go is your server language.

When a framework earns its keep

Auth. This is the biggest gap. FastMCP documents token verification, remote OAuth with external identity providers (Descope, WorkOS, Auth0, corporate SSO), OAuth and OIDC proxies for providers that don't support MCP's flow, a self-contained OAuth server, multiple auth sources and per-component authorization. mcp-use has ready-made providers for Auth0, Better Auth, Clerk, Keycloak, Supabase and WorkOS. With the official SDKs you put the authorization server together yourself. For the steps, see Add OAuth to your MCP server.

UI (MCP Apps). An MCP App is a tool plus a ui:// HTML resource that the host renders in a sandboxed iframe. mcp-use is built around this, with React "Views" bound to tools and typed props. FastMCP has Apps as one of its three pillars, and the Python SDK ships an Apps extension. The TypeScript SDK's v2 docs index doesn't list it.

Testing. mcp-use serves an Inspector at /mcp/inspector while you develop, and the Python SDK's mcp dev opens MCP Inspector. Every option can be tested with a scripted client, as in Test your MCP server.

Deploying. All four can run as a plain HTTP service. The two frameworks also sell hosting: Prefect Horizon from the FastMCP team (gateway, registry, SSO and RBAC) and Manufact Cloud from the mcp-use team. Both are optional. Once the server is up, Publish an MCP server covers registries and listings. If you need a stdio server reachable over HTTP, or the other way round, see Bridge stdio and remote MCP servers.

Adoption claims, with care

FastMCP's README says FastMCP 1.0 was folded into the official Python SDK in 2024 and that "some version of FastMCP powers 70% of MCP servers across all languages". These are the project's own figures and were not checked here. mcp-use publishes MCP conformance badges for its Python server and client. Treat both as signals, not benchmarks.

A client to test against

To drive your server from an agent rather than an inspector, fast-agent connects to stdio or Streamable HTTP servers with /connect, supports sampling and elicitation, and includes transport diagnostics. That makes it handy for checking that a new server works end to end.

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