# @mcpfusion/yaml [Health: Active]

**Category:** 💻 Developer Tools  
**Repository:** https://github.com/vinkius-labs/mcpfusion  
**GitHub Stars:** 255  
**Views:** 0  
**Installs:** 0  
**Upvotes:** 0  
**Directory Page:** https://allmcps.com/mcp/mcpfusion-yaml

## Description
Declarative MCP Server Engine — define tools, resources, and prompts in mcpfusion.yaml. The docker-compose for MCP servers.

## Claude Desktop Quick Installation
No confirmed install details yet, so no config is published. Follow the setup steps in the repository above.

## Documentation

## What @mcpfusion/yaml does

The @mcpfusion/yaml MCP server provides a declarative format for describing MCP server surfaces. A `mcpfusion.yaml` file can define tools, resources, and prompts, allowing these capabilities to be represented as configuration instead of being assembled solely through TypeScript implementation code.

The package is part of MCP Fusion, a TypeScript framework for building MCP servers. The repository describes MCP Fusion as MCP 2.0-native and includes framework features such as typed responses, response filtering, workflow-based tool visibility, and behavioral auditing. Those capabilities belong to the wider framework; the supplied material specifically identifies the YAML package with declarative server definition.

This places the package in the Developer Tools category and makes it relevant to projects that want configuration-managed MCP interfaces.

## How it works

The configuration entry point is a file named `mcpfusion.yaml`. Definitions in that file describe the server’s available tools, resources, and prompts. MCP Fusion then provides the surrounding server framework and protocol implementation for exposing those definitions to MCP clients.

The repository also documents support for MCP 2.0 features, including stateless serving, structured tool output, output schemas, pagination, resource templates, subscriptions, and protocol metadata. The excerpt does not specify which of these features are configured directly through YAML, so they should not be assumed to be available as YAML fields without consulting the package documentation.

The project’s architecture includes controls for validating and shaping data before it reaches an agent, hiding tools based on workflow state, and recording behavioral changes in a lockfile. These are framework-level concepts that may be relevant when a YAML-defined server is used within MCP Fusion.

## Setup and configuration

Create or use a project based on MCP Fusion and place the declarative server configuration in `mcpfusion.yaml`. Add the tools, resources, and prompts that the server should expose according to the package’s supported schema. The provided material does not include installation commands, a complete YAML example, required fields, transport settings, or environment variables, so those details must be taken from the repository or package documentation.

The repository is TypeScript-based and includes a machine-readable `SKILL.md` for AI coding agents. Cursor, Claude Code, and Windsurf are named as environments that can use this guidance when developing MCP Fusion servers.

## Tools and capabilities

The supported declarative capabilities identified in the supplied material are:

- Define MCP tools in `mcpfusion.yaml`.
- Define MCP resources in `mcpfusion.yaml`.
- Define MCP prompts in `mcpfusion.yaml`.
- Use the @mcpfusion/yaml MCP server as part of the MCP Fusion TypeScript framework.
- Build against the project’s documented MCP 2.0-oriented server architecture.

## Limitations and notes

The @mcpfusion/yaml MCP server is described as a configuration engine, not as a connector to a named external service. The supplied material does not identify database, SaaS, filesystem, or API integrations provided by the YAML package.

No YAML schema, validation rules, command-line interface, transport choice, authentication configuration, or client installation procedure is included in the excerpt. Do not infer those details from the framework’s broader TypeScript APIs. Review the package documentation before relying on a particular field or deployment mode.

_Full upstream README: https://allmcps.com/mcp/mcpfusion-yaml/readme_