MCP Fusion/Get started/Vinkius MCP Fusion
Vinkius MCP Fusion
MCP Fusion is the TypeScript framework for secure AI connectors. Build your own connector and deploy it to Vinkius Cloud with free hosting, no credit card required.
MCP Fusion is the TypeScript framework for building secure MCP servers, the servers Vinkius calls connectors. You write your tools, models and presenters in plain TypeScript, and one command puts your connector on the Vinkius Edge with totally free hosting: no credit card, no server to manage, no infrastructure bill. Your connector then lives in the same console, behind the same security layers and next to the same thousands of connectors your users already enable.
That is the whole pitch of this section: your connector, your code, our infrastructure, zero cost.
Why a framework at all
The official MCP SDK gives you the protocol and nothing else. Everything that makes a server safe to expose to an AI agent is left to you: input validation, redaction of sensitive fields, authentication, tenant isolation, audit logs. Skip any of them and the failure is silent, because the agent sees whatever your handler returns.
MCP Fusion makes the safe path the default path:
| Without MCP Fusion | With MCP Fusion |
|---|---|
JSON.stringify whatever the query returns | A Presenter shapes exactly what the agent sees |
| Sensitive columns ride along by accident | .redactPII() removes them before they reach the model |
| Prompt says "divided by 100, hopefully" | .rules() teach the agent the meaning of each field |
| Hand-rolled auth per tool | Composable middleware attached with .use() |
| Unknown attack surface | A capability lockfile hashes every behavior for your CI |
The pattern behind this is called MVA, Model View Agent, and it is explained in The MVA pattern.
Three ways to author
- Zero code. Describe tools in YAML with
@mcpfusion/yamland run them withmcpfusion yaml dev. Good for wrapping internal APIs. - Typed MVA. The full framework: models, presenters, middleware, the Result monad. This is the path every page in this section follows.
- State gated workflows. FSM tools that physically disappear from the agent's tool list when the workflow state forbids them. See Tools.
All three produce the same artifact: an MCP server that can be deployed to Vinkius Cloud with mcpfusion deploy.
What the free hosting includes
Deploying a connector to Vinkius Cloud costs nothing and gives you:
- Global edge hosting with V8 sandbox isolation, no containers to maintain
- DLP engine, egress firewall, kill switch, audit trail, rate limiter and circuit breaker enabled on deploy
- A connection token and MCP URL ready for Claude, Cursor, VS Code or any MCP client
- Management from the same console that documents the rest of this site: usage, capabilities, credentials and cost
The framework is free and open source (Apache 2.0) and the Vinkius Cloud hosting for deployed connectors is free too. You never need a credit card to build and ship a connector with MCP Fusion.
Who this is for
MCP Fusion speaks to builders. If you are wrapping your company's internal API for an AI copilot, publishing a connector to the catalog, or giving a vertical agent safe access to production data, the framework removes the plumbing and the free hosting removes the bill. You compete on your product. The plumbing is done.
If you want to consume connectors from your own application instead of building them, that is the Connect SDK. See Connect SDK.
Where to go next
- Installation: packages, requirements and scaffolding
- Quickstart: a working connector with a Presenter in minutes
- Deploy: the free hosting story, command by command
- Credentials: publish connectors whose buyers bring their own keys
- Under the hood: the runtime architecture, the security pipeline and the wire format