@modelcontextprotocol/server-everything
MCP ServerFreeMCP server that exercises all the features of the MCP protocol
Capabilities9 decomposed
mcp protocol feature demonstration and validation
Medium confidenceImplements a comprehensive MCP server that exercises all protocol features including resources, tools, prompts, and sampling capabilities. Acts as a reference implementation and testing harness that demonstrates proper MCP server architecture patterns, request/response handling, and protocol compliance validation for developers building MCP-compatible clients and servers.
Serves as the official MCP protocol reference implementation that exercises all specification features in a single server, providing a canonical example of proper MCP server architecture and protocol compliance for the entire ecosystem
More comprehensive than minimal MCP examples because it demonstrates all protocol capabilities (resources, tools, prompts, sampling) in production-ready patterns rather than toy implementations
resource serving with uri-based access patterns
Medium confidenceImplements MCP resource protocol with URI-based addressing and content serving. Handles resource discovery, URI templating, and content delivery through the MCP resource mechanism, allowing clients to request and retrieve typed content (text, binary, structured) through standardized resource endpoints with metadata and MIME type support.
Demonstrates MCP resource protocol with full URI templating and metadata support, showing how to properly structure resource endpoints with type information and discovery mechanisms as specified in the MCP protocol
More structured than ad-hoc REST endpoints because resources include standardized metadata, discovery, and templating built into the protocol rather than requiring custom documentation
tool definition and invocation with schema validation
Medium confidenceImplements MCP tool protocol with JSON Schema-based tool definitions, parameter validation, and execution handling. Provides tool discovery with full schema information, validates incoming tool calls against defined schemas, and executes tools with proper error handling and result formatting according to MCP tool response specifications.
Provides complete MCP tool implementation with JSON Schema validation and discovery, demonstrating proper tool definition patterns and error handling as specified in the MCP protocol specification
More robust than simple function registries because it includes schema-based validation, discovery metadata, and standardized error handling built into the protocol layer
prompt template management with variable substitution
Medium confidenceImplements MCP prompt protocol with template storage, variable substitution, and prompt discovery. Manages prompt definitions with argument schemas, performs variable interpolation, and returns completed prompts with proper formatting for use by clients in LLM interactions.
Demonstrates MCP prompt protocol with full template management and discovery, showing how to structure reusable prompts with argument schemas and proper variable substitution as per MCP specification
More discoverable than hardcoded prompts because templates include schema information and are queryable through the protocol, enabling dynamic client-side prompt selection
sampling capability with model-agnostic completion requests
Medium confidenceImplements MCP sampling protocol that allows servers to request LLM completions from clients. Provides sampling request construction with model selection, parameter configuration, and response handling for server-initiated model interactions, enabling servers to perform reasoning or generation tasks that require LLM capabilities.
Demonstrates MCP sampling protocol enabling servers to request completions from clients, inverting the typical client-calls-model pattern to allow server-side reasoning and generation within the MCP architecture
Enables server-side reasoning that would otherwise require servers to have direct model access, allowing MCP servers to perform complex reasoning while delegating model access to the client
protocol transport abstraction with stdio and sse support
Medium confidenceImplements MCP transport layer supporting both stdio (standard input/output) and Server-Sent Events (SSE) protocols for client-server communication. Handles JSON-RPC message framing, bidirectional communication, and transport-specific error handling, allowing flexible deployment across different communication channels.
Demonstrates MCP transport abstraction supporting both stdio for local integration and SSE for HTTP-based deployment, showing how to implement transport-agnostic server code that works across different communication channels
More flexible than single-transport implementations because it supports both local (stdio) and remote (SSE) deployment patterns without code duplication
json-rpc 2.0 protocol implementation with request/response handling
Medium confidenceImplements complete JSON-RPC 2.0 specification for MCP message framing, including request/response correlation, error handling with proper error codes, and notification support. Handles message serialization, request ID tracking, and protocol-level error responses according to JSON-RPC 2.0 specification.
Provides complete JSON-RPC 2.0 implementation for MCP with proper error handling, request correlation, and notification support as specified in the JSON-RPC 2.0 standard
More robust than manual JSON handling because it enforces JSON-RPC 2.0 compliance with proper error codes, request ID tracking, and protocol-level validation
server initialization and capability negotiation
Medium confidenceImplements MCP server initialization protocol with capability declaration and feature negotiation. Handles server info reporting, supported protocol versions, and capability advertisement during connection handshake, allowing clients to discover server capabilities and negotiate compatible protocol features.
Demonstrates MCP server initialization with full capability declaration and version negotiation, showing proper protocol handshake patterns for establishing compatible client-server connections
More discoverable than implicit capability detection because servers explicitly declare supported features during initialization, enabling clients to make informed decisions about feature usage
error handling and protocol compliance validation
Medium confidenceImplements comprehensive error handling with MCP-compliant error responses, including proper error codes, messages, and data fields. Validates protocol compliance at each layer (transport, JSON-RPC, MCP protocol) and returns appropriate errors for invalid requests, unsupported operations, and runtime failures.
Provides comprehensive error handling with MCP protocol compliance validation at all layers, ensuring proper error responses and protocol adherence throughout the server lifecycle
More reliable than generic error handling because it validates protocol compliance and returns MCP-compliant errors that clients can properly interpret and handle
Capabilities are decomposed by AI analysis. Each maps to specific user intents and improves with match feedback.
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Best For
- ✓MCP protocol implementers and framework developers
- ✓Teams building MCP clients needing a comprehensive test server
- ✓Developers learning the MCP specification through working code
- ✓Protocol validators and conformance testing tools
- ✓MCP server developers implementing resource endpoints
- ✓Teams building knowledge bases or document servers over MCP
- ✓Developers creating content delivery systems with MCP
- ✓Protocol implementers validating resource handling
Known Limitations
- ⚠Designed for demonstration and testing, not production workloads
- ⚠No persistence layer — all state is in-memory and ephemeral
- ⚠Limited to showcasing protocol features rather than solving real domain problems
- ⚠No built-in authentication or authorization mechanisms beyond MCP protocol defaults
- ⚠Resource content is generated on-demand without caching layer
- ⚠No built-in pagination for large resource collections
Requirements
Input / Output
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MCP server that exercises all the features of the MCP protocol
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