{"passport":{"unfragile":{"@version":"1.0","version":"2026-05","artifact":{"id":"npm_npm-mcp-hello-world","slug":"npm-mcp-hello-world","name":"mcp-hello-world","type":"mcp","url":"https://www.npmjs.com/package/mcp-hello-world","page_url":"https://unfragile.ai/npm-mcp-hello-world","categories":["mcp-servers"],"tags":["lobehub","model-context-protocol","sdk"],"pricing":{"model":"open_source","free":true,"starting_price":null},"status":"active","verified":false},"capabilities":[{"id":"npm_npm-mcp-hello-world__cap_0","uri":"capability://tool.use.integration.mcp.server.initialization.and.protocol.handshake","name":"mcp server initialization and protocol handshake","description":"Implements the Model Context Protocol server-side initialization sequence, handling JSON-RPC 2.0 message framing over stdio transport. The server establishes bidirectional communication with MCP clients by parsing initialization requests, validating protocol versions, and returning server capabilities in a standardized capability advertisement format. Uses event-driven message handling to manage the lifecycle from connection establishment through capability negotiation.","intents":["Set up a basic MCP server that can communicate with Claude Desktop or other MCP clients","Understand the minimal scaffolding required to implement the MCP protocol specification","Create a reference implementation for learning how MCP servers handle protocol negotiation"],"best_for":["developers learning MCP protocol fundamentals","teams building their first MCP server integration","educators teaching protocol-based AI integration patterns"],"limitations":["No built-in error recovery or reconnection logic — single connection failure terminates the server","Stdio transport only — no support for HTTP, WebSocket, or other transport layers","Minimal logging/debugging output — production deployments need custom instrumentation"],"requires":["Node.js 14+ (for async/await and modern JavaScript features)","npm or yarn package manager","MCP client implementation (Claude Desktop, LLM SDK with MCP support, or custom client)"],"input_types":["JSON-RPC 2.0 requests over stdin","MCP protocol initialization messages"],"output_types":["JSON-RPC 2.0 responses over stdout","MCP capability advertisements","Protocol acknowledgment messages"],"categories":["tool-use-integration","protocol-implementation"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"npm_npm-mcp-hello-world__cap_1","uri":"capability://tool.use.integration.tool.definition.and.schema.registration","name":"tool definition and schema registration","description":"Defines and registers tools (resources or functions) that the MCP server exposes to clients using JSON Schema for type validation. The server maintains an internal registry of available tools with their input schemas, descriptions, and execution handlers. When clients request tool listings, the server serializes these definitions into MCP-compliant tool advertisement messages that include parameter types, required fields, and usage documentation.","intents":["Expose custom functions or resources to MCP clients in a standardized, discoverable way","Define input validation schemas so clients can validate arguments before sending requests","Create a tool catalog that clients can query to understand what operations are available"],"best_for":["developers building custom tool integrations for Claude or other MCP-aware AI systems","teams creating domain-specific tool sets (e.g., database queries, file operations, API calls)","builders prototyping AI agent capabilities with structured tool interfaces"],"limitations":["Schema validation is declarative only — actual runtime validation must be implemented in tool handlers","No built-in versioning for tool schemas — breaking changes require client coordination","Limited to JSON Schema subset — complex validation logic must be implemented in handler code"],"requires":["Node.js 14+","Understanding of JSON Schema format","MCP client that supports tool calling (Claude Desktop, Anthropic SDK, etc.)"],"input_types":["JSON Schema definitions","Tool metadata (name, description, parameters)"],"output_types":["MCP tool advertisement messages","JSON Schema validation documents","Tool execution results"],"categories":["tool-use-integration","data-processing-analysis"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"npm_npm-mcp-hello-world__cap_2","uri":"capability://tool.use.integration.tool.invocation.and.request.handling","name":"tool invocation and request handling","description":"Processes incoming tool call requests from MCP clients, routes them to registered tool handlers, and returns results in MCP-compliant response format. The server implements a request-response pattern where each tool invocation includes a unique request ID, tool name, and arguments object. Handlers execute synchronously or asynchronously and return results that are wrapped in MCP response envelopes with proper error handling for missing tools or execution failures.","intents":["Execute custom logic when an AI client requests a tool be called","Handle tool arguments passed from the client and return structured results","Implement error handling for invalid tool names or malformed arguments"],"best_for":["developers implementing tool handlers for domain-specific operations","teams building AI agents that need to execute external functions","builders creating integrations between AI systems and backend services"],"limitations":["No built-in timeout mechanism — long-running tools can block the entire server","Synchronous request handling only — concurrent tool calls are serialized","No automatic retry logic — failed tool calls require client-side retry implementation"],"requires":["Node.js 14+","Registered tool definitions in the server","MCP client sending properly formatted tool call requests"],"input_types":["JSON-RPC tool call requests with tool name and arguments","Arbitrary JSON arguments matching tool schema"],"output_types":["JSON-RPC responses with tool execution results","Error responses with error codes and messages","Structured result objects"],"categories":["tool-use-integration","automation-workflow"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"npm_npm-mcp-hello-world__cap_3","uri":"capability://tool.use.integration.hello.world.example.tool.implementation","name":"hello world example tool implementation","description":"Includes a pre-built 'hello' tool that demonstrates the complete pattern of tool definition, schema specification, and handler implementation. The tool accepts an optional name parameter and returns a greeting message, serving as a reference implementation for how to structure tool code. This example shows the minimal viable tool that can be extended with actual business logic while maintaining the MCP protocol contract.","intents":["Understand the complete end-to-end pattern for creating an MCP tool","Test that the MCP server is working correctly with a simple, known tool","Use as a template for building new tools with similar structure"],"best_for":["developers new to MCP who need a working example to build from","teams onboarding new engineers to MCP patterns","quick prototyping and testing of MCP server setup"],"limitations":["Trivial functionality — not suitable for production use cases","No error handling examples — doesn't demonstrate validation or exception patterns","Single tool only — doesn't show how to manage multiple tools or tool dependencies"],"requires":["Node.js 14+","npm or yarn to install the package"],"input_types":["Optional 'name' parameter as a string"],"output_types":["Greeting message string"],"categories":["tool-use-integration","text-generation-language"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"npm_npm-mcp-hello-world__cap_4","uri":"capability://tool.use.integration.mcp.client.communication.via.stdio.transport","name":"mcp client communication via stdio transport","description":"Establishes bidirectional communication with MCP clients using Node.js stdin/stdout streams for JSON-RPC message exchange. The server reads JSON-RPC messages from stdin, parses them into request objects, processes them, and writes JSON-RPC responses back to stdout. This stdio-based transport is the standard MCP transport mechanism used by Claude Desktop and other MCP-aware applications, with line-delimited JSON framing for message boundaries.","intents":["Enable an MCP server to receive requests from Claude Desktop or other MCP clients","Send tool results and responses back to the client in real-time","Maintain a persistent connection for multiple sequential tool calls"],"best_for":["developers building MCP servers for Claude Desktop integration","teams creating local-first AI tool integrations","builders prototyping MCP-based AI agent architectures"],"limitations":["Stdio transport is process-local only — cannot be accessed over network without additional tunneling","No built-in message buffering — high-volume message streams may cause backpressure","Single connection per process — scaling requires multiple server instances"],"requires":["Node.js 14+ with native stream support","MCP client that supports stdio transport (Claude Desktop, Anthropic SDK, etc.)","Process must be spawned with stdio pipes available"],"input_types":["Line-delimited JSON-RPC 2.0 messages on stdin"],"output_types":["Line-delimited JSON-RPC 2.0 messages on stdout"],"categories":["tool-use-integration","automation-workflow"],"confidence":0.5,"matches":0,"success_rate":0}],"trust":{"score":37,"verified":false,"data_access_risk":"high","permissions":["Node.js 14+ (for async/await and modern JavaScript features)","npm or yarn package manager","MCP client implementation (Claude Desktop, LLM SDK with MCP support, or custom client)","Node.js 14+","Understanding of JSON Schema format","MCP client that supports tool calling (Claude Desktop, Anthropic SDK, etc.)","Registered tool definitions in the server","MCP client sending properly formatted tool call requests","npm or yarn to install the package","Node.js 14+ with native stream support"],"failure_modes":["No built-in error recovery or reconnection logic — single connection failure terminates the server","Stdio transport only — no support for HTTP, WebSocket, or other transport layers","Minimal logging/debugging output — production deployments need custom instrumentation","Schema validation is declarative only — actual runtime validation must be implemented in tool handlers","No built-in versioning for tool schemas — breaking changes require client coordination","Limited to JSON Schema subset — complex validation logic must be implemented in handler code","No built-in timeout mechanism — long-running tools can block the entire server","Synchronous request handling only — concurrent tool calls are serialized","No automatic retry logic — failed tool calls require client-side retry implementation","Trivial functionality — not suitable for production use cases","builder identity is not verified yet","no observed match outcomes yet"],"rank_breakdown":{"adoption":0.5564715887633113,"quality":0.2,"ecosystem":0.38999999999999996,"match_graph":0.25,"freshness":0.52,"weights":{"adoption":0.25,"quality":0.25,"ecosystem":0.15,"match_graph":0.23,"freshness":0.12}},"observed_outcomes":{"matches":0,"success_rate":0,"avg_confidence":0,"top_intents":[],"last_matched_at":null},"maintenance":{"status":"active","updated_at":"2026-05-24T12:16:23.903Z","last_scraped_at":"2026-05-03T14:23:34.094Z","last_commit":null},"community":{"stars":null,"forks":null,"weekly_downloads":30292,"model_downloads":null,"model_likes":null}},"distribution":{"claim_url":"https://unfragile.ai/submit?claim=npm-mcp-hello-world","compare_url":"https://unfragile.ai/compare?artifact=npm-mcp-hello-world"}},"signature":"bVgITdmidMrLUsjaIpuSs9tUGUOMEJ9Xro5ycp5YYqJhVRe7KLahpDCbMOzzxuQxf2Pz00fCmsakUjLKPFbICw==","signedAt":"2026-06-19T19:21:42.631Z","signedBy":"unfragile.ai","version":1},"_links":{"self":"https://unfragile.ai/api/v1/passport/npm-mcp-hello-world","artifact":"https://unfragile.ai/npm-mcp-hello-world","verify":"https://unfragile.ai/api/v1/verify?slug=npm-mcp-hello-world","publicKey":"https://unfragile.ai/api/v1/trust-passport-public-key","spec":"https://unfragile.ai/trust","schema":"https://unfragile.ai/schema.json","docs":"https://unfragile.ai/docs"}}