Everything
Reference / test server with prompts, resources, and tools.
Details
Category
Reference Servers
Implementation Language
TypeScript
Tags
Resources
Deep Review
The Everything MCP server is a comprehensive reference implementation that showcases all MCP protocol features including resources, tools, and prompts. It serves as both a testing tool and a learning resource for understanding MCP capabilities. This server is ideal for developers building MCP clients or learning the protocol, as it demonstrates best practices and complete feature coverage.
Core Features
Everything server implements the complete MCP specification: resources for data access, tools for actions, and prompts for guided interactions. It includes examples of synchronous and asynchronous operations, error handling patterns, and progress reporting. The server demonstrates proper lifecycle management, capability negotiation, and transport layer handling across stdio, HTTP, and WebSocket transports.
Use Cases
Primary use cases include MCP client development and testing, protocol learning and experimentation, integration testing for MCP implementations, and demonstrating MCP capabilities to stakeholders. Development teams use it to validate their client implementations against a known-good server, while educators use it to teach MCP concepts with working examples.
Configuration Guide
Install via npx: 'npx -y @modelcontextprotocol/server-everything'. The server requires no additional configuration for basic usage. For advanced scenarios, you can specify custom resource paths, enable specific feature sets, or configure transport options. The server supports environment variables for customizing behavior without code changes.
Best Practices
Use Everything server primarily for development and testing, not production workloads. When learning MCP, start with simple resource queries before exploring tools and prompts. For client testing, verify all three primitive types (resources, tools, prompts) work correctly. Document which features your client uses from the Everything server to guide future compatibility testing.
Examples
Resource Discovery
Input: List all available resources
Expected: Server returns a catalog of example resources including static data, dynamic content, and templated resources with their URIs and descriptions
Tool Invocation
Input: Call the 'echo' tool with message 'Hello MCP'
Expected: Tool executes successfully and returns the echoed message, demonstrating basic tool calling mechanics
Comparisons
Custom test server
Pros: Tailored to specific needs
Cons: Requires maintenance; may not cover full protocol; lacks community validation
Production servers
Pros: Real-world usage patterns
Cons: Limited feature coverage; not designed for testing; may have side effects
Conclusion
Everything server is essential for MCP development and learning. Use it to validate client implementations, understand protocol features, and demonstrate capabilities. Not recommended for production use, but invaluable during development and testing phases.