{"passport":{"unfragile":{"@version":"1.0","version":"2026-05","artifact":{"id":"github_mcp-modelcontextprotocol-inspector","slug":"mcp-modelcontextprotocol-inspector","name":"inspector","type":"mcp","url":"https://github.com/modelcontextprotocol/inspector","page_url":"https://unfragile.ai/mcp-modelcontextprotocol-inspector","categories":["mcp-servers"],"tags":[],"pricing":{"model":"open_source","free":true,"starting_price":null},"status":"active","verified":false},"capabilities":[{"id":"github_mcp-modelcontextprotocol-inspector__cap_0","uri":"capability://tool.use.integration.mcp.server.protocol.bridging.via.express.proxy","name":"mcp server protocol bridging via express proxy","description":"Translates browser-incompatible MCP transport protocols (STDIO, SSE, Streamable HTTP) into browser-friendly transports (SSE, WebSocket) through an Express-based proxy server. The mcpProxy function maintains bidirectional message routing between transportToClient and transportToServer, enabling browsers to interact with local and remote MCP servers without direct process spawning or long-lived pipe management.","intents":["I need to test an MCP server from a web browser without modifying the server's transport layer","I want to debug MCP protocol messages flowing between client and server in real-time","I need to support multiple transport types (STDIO, SSE, HTTP) from a single web interface"],"best_for":["MCP server developers testing servers locally via web UI","Teams building MCP integrations who need visual debugging","Developers working with heterogeneous MCP transport implementations"],"limitations":["Proxy adds network latency for STDIO-based servers (typically 10-50ms per round-trip)","Session token authentication is random per startup — no persistent credentials across restarts","WebSocket transport requires browser support; SSE fallback may have higher latency","No built-in load balancing for multiple concurrent MCP server connections"],"requires":["Node.js 18+","Express.js (included in server package)","MCP SDK with StdioClientTransport, SSEClientTransport, or StreamableHTTPClientTransport","MCP_PROXY_AUTH_TOKEN environment variable or URL parameter for security"],"input_types":["MCP protocol messages (JSON-RPC 2.0 format)","Server configuration (transport type, endpoint, credentials)"],"output_types":["MCP protocol responses (JSON-RPC 2.0 format)","Protocol error messages and diagnostics"],"categories":["tool-use-integration","proxy-middleware"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"github_mcp-modelcontextprotocol-inspector__cap_1","uri":"capability://tool.use.integration.interactive.web.ui.for.mcp.tool.discovery.and.execution","name":"interactive web ui for mcp tool discovery and execution","description":"React-based web interface (built with Radix UI and Vite) that dynamically renders MCP server capabilities including tools, resources, and prompts. The UI introspects server metadata, generates forms for tool parameters, executes tools via the proxy, and displays results with full protocol visibility. Connection management hooks (useConnection) maintain WebSocket/SSE state and handle reconnection logic.","intents":["I want to visually explore what tools and resources an MCP server exposes without reading documentation","I need to test tool execution with different parameter combinations interactively","I want to see the exact MCP protocol messages being sent and received for debugging"],"best_for":["MCP server developers validating tool definitions and parameter schemas","Non-technical stakeholders exploring server capabilities via visual interface","QA engineers testing MCP servers without writing client code"],"limitations":["UI rendering performance degrades with >100 tools in a single server (no virtualization implemented)","Form generation relies on JSON Schema compliance — non-standard schemas may render incorrectly","No built-in persistence of test history across browser sessions (requires external storage)","Real-time protocol monitoring limited to current session; no log export or replay functionality"],"requires":["Modern browser with ES2020+ support (Chrome 80+, Firefox 75+, Safari 14+)","Active connection to inspector-server proxy","MCP server with properly formatted tool/resource/prompt metadata"],"input_types":["MCP server metadata (tools, resources, prompts)","User form inputs for tool parameters","Connection configuration (server URL, auth token)"],"output_types":["Rendered tool forms and parameter inputs","Tool execution results (structured data or text)","Protocol message logs (JSON-RPC request/response pairs)"],"categories":["tool-use-integration","automation-workflow"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"github_mcp-modelcontextprotocol-inspector__cap_10","uri":"capability://automation.workflow.monorepo.workspace.management.with.npm.workspaces","name":"monorepo workspace management with npm workspaces","description":"Organizes inspector into three interdependent npm packages (inspector-client, inspector-server, inspector-cli) using npm workspaces. Shared dependencies are hoisted to root package.json, reducing duplication and ensuring version consistency. Build scripts coordinate compilation across packages (TypeScript → JavaScript), and development scripts enable simultaneous development of all packages with hot-reload support via Vite.","intents":["I want to develop the web UI, proxy server, and CLI tool simultaneously without managing separate repositories","I need to ensure all packages use consistent dependency versions","I want to build and deploy all packages together as a cohesive product"],"best_for":["Inspector maintainers managing multiple interdependent packages","Teams building tools with web UI, server, and CLI components","Developers contributing to inspector across multiple packages"],"limitations":["npm workspaces require Node.js 16.9+ and npm 8+ (older versions not supported)","Shared dependencies can cause version conflicts if packages require different versions","Monorepo structure makes it harder to release individual packages independently","Build order dependencies must be manually managed (no automatic topological sorting)","Workspace hoisting can cause unexpected behavior if packages have conflicting peer dependencies"],"requires":["Node.js 16.9+","npm 8+","TypeScript 4.5+ for compilation","Vite for development server (client package)"],"input_types":["Source code in client/, server/, cli/ directories","package.json files with workspace declarations"],"output_types":["Compiled JavaScript in dist/ directories","Development server running on localhost:5173 (Vite)","Bundled CLI executable"],"categories":["automation-workflow","code-generation-editing"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"github_mcp-modelcontextprotocol-inspector__cap_11","uri":"capability://code.generation.editing.typescript.compilation.with.vite.bundling.for.web.client","name":"typescript compilation with vite bundling for web client","description":"Compiles TypeScript source code to JavaScript using TypeScript compiler, then bundles the web client using Vite for development and production builds. Vite provides hot module replacement (HMR) during development, enabling instant feedback on code changes without full page reloads. Production builds are minified and optimized for browser delivery. Build configuration is defined in vite.config.ts with React plugin for JSX support.","intents":["I want to develop the web UI with fast feedback (hot reload) without rebuilding","I need to bundle the web client for production with optimized asset sizes","I want to use modern TypeScript and React without manual transpilation"],"best_for":["Web UI developers working on inspector-client","Teams deploying inspector web interface to production","Developers needing fast development iteration with HMR"],"limitations":["Vite requires modern browser support (ES2020+); no IE11 compatibility","Build artifacts are not cached between runs (full rebuild on each invocation)","Source maps are not generated in production builds (harder to debug production issues)","Vite dev server requires Node.js process to remain running (not suitable for static hosting)","Large dependency trees (>100 packages) may cause slow initial Vite startup"],"requires":["Node.js 18+","TypeScript 4.5+","Vite 4.0+","React 18+ (for JSX compilation)"],"input_types":["TypeScript source files (.ts, .tsx)","CSS and asset files"],"output_types":["Bundled JavaScript (dist/index.js)","Minified CSS (dist/style.css)","HTML entry point (dist/index.html)"],"categories":["code-generation-editing","automation-workflow"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"github_mcp-modelcontextprotocol-inspector__cap_2","uri":"capability://tool.use.integration.multi.transport.mcp.client.with.dynamic.transport.selection","name":"multi-transport mcp client with dynamic transport selection","description":"Abstracts MCP transport selection (STDIO, SSE, Streamable HTTP) behind a unified client interface using the MCP SDK's transport layer. The proxy server dynamically instantiates the correct transport based on user configuration, enabling seamless switching between local executable servers, remote SSE endpoints, and HTTP-based servers without code changes. Transport initialization is lazy-loaded on first connection.","intents":["I want to test the same MCP server implementation across different transport protocols","I need to support both local development servers and remote production servers from one tool","I want to avoid hardcoding transport logic in my testing infrastructure"],"best_for":["MCP server developers validating transport-agnostic implementations","DevOps teams managing MCP servers across local and cloud environments","Framework maintainers building transport-agnostic tooling"],"limitations":["STDIO transport requires server executable to be available on the same machine; no remote execution","SSE transport is unidirectional for server-to-client messages; requires polling for client-to-server","Streamable HTTP transport requires server to implement custom HTTP streaming protocol","No automatic transport fallback if primary transport fails (manual reconfiguration required)"],"requires":["MCP SDK version 0.1.0+","Transport-specific dependencies: child_process for STDIO, fetch API for SSE/HTTP","Server configuration specifying transport type and endpoint"],"input_types":["Transport type identifier (stdio, sse, http)","Transport-specific configuration (executable path, URL, credentials)"],"output_types":["Initialized transport client instance","Transport-specific error messages and diagnostics"],"categories":["tool-use-integration","automation-workflow"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"github_mcp-modelcontextprotocol-inspector__cap_3","uri":"capability://safety.moderation.session.based.authentication.with.random.token.generation","name":"session-based authentication with random token generation","description":"Generates a cryptographically random session token at proxy startup and validates it on every request via environment variable (MCP_PROXY_AUTH_TOKEN) or URL parameter. Token is not persisted across restarts, preventing unauthorized access to local process execution. Validation occurs before any MCP protocol message is routed, providing a lightweight security boundary without external auth infrastructure.","intents":["I want to prevent unauthorized access to my local MCP server from other processes or network clients","I need a simple authentication mechanism that doesn't require external auth services","I want to ensure only my development environment can execute tools on my machine"],"best_for":["Solo developers running MCP servers on local machines","Development teams using inspector on internal networks","Developers who need basic security without OAuth/SAML complexity"],"limitations":["Token is random per startup — no persistent credentials across restarts or deployments","No role-based access control (RBAC) — all authenticated users have full server access","Token transmitted in URL parameter or header without encryption (requires HTTPS for production)","No token revocation mechanism — only way to invalidate is restart the proxy","No audit logging of who accessed which tools or when"],"requires":["Node.js crypto module (built-in)","Environment variable MCP_PROXY_AUTH_TOKEN set before proxy startup, OR","URL parameter ?token=<random-token> passed to client"],"input_types":["Session token (random hex string, typically 32+ characters)"],"output_types":["Authentication success/failure response","401 Unauthorized error if token is missing or invalid"],"categories":["safety-moderation","tool-use-integration"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"github_mcp-modelcontextprotocol-inspector__cap_4","uri":"capability://automation.workflow.command.line.interface.for.programmatic.mcp.server.interaction","name":"command-line interface for programmatic mcp server interaction","description":"Commander.js-based CLI tool (@modelcontextprotocol/inspector-cli) that enables non-interactive, programmatic interaction with MCP servers. Supports transport configuration via CLI flags, tool execution with JSON parameter input, and structured output for scripting. CLI client methods wrap MCP SDK calls, enabling integration into CI/CD pipelines, automation scripts, and headless testing frameworks without requiring a web browser.","intents":["I want to test MCP servers in CI/CD pipelines without a web browser","I need to automate tool execution across multiple servers with shell scripts","I want to integrate MCP server testing into my build/test infrastructure"],"best_for":["DevOps engineers automating MCP server testing in CI/CD","Developers building CLI tools that depend on MCP servers","Teams running headless testing in containerized environments"],"limitations":["No interactive REPL mode — each invocation is a separate process (startup overhead ~100-200ms)","Output format is JSON-only; no human-readable formatting options","No streaming output for long-running tool executions (waits for full completion)","Limited error handling — failures exit with generic error codes rather than detailed diagnostics","No built-in retry logic or timeout configuration"],"requires":["Node.js 18+","Commander.js CLI framework","MCP SDK for client methods","Transport configuration (executable path for STDIO, URL for SSE/HTTP)"],"input_types":["CLI flags (--transport, --server, --tool, --params)","JSON-formatted tool parameters via stdin or file","Server configuration (URL, credentials, executable path)"],"output_types":["JSON-formatted tool results","Exit codes (0 for success, non-zero for failure)","Structured error messages to stderr"],"categories":["automation-workflow","tool-use-integration"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"github_mcp-modelcontextprotocol-inspector__cap_5","uri":"capability://automation.workflow.real.time.protocol.message.logging.and.inspection","name":"real-time protocol message logging and inspection","description":"Captures and displays all MCP protocol messages (JSON-RPC 2.0 requests and responses) flowing through the proxy in real-time. Messages are logged with timestamps, method names, parameters, and results. The web UI displays logs in a scrollable panel with syntax highlighting, enabling developers to inspect protocol details without external tools like Wireshark. Logs are stored in browser memory (no persistence across page reloads).","intents":["I want to see the exact MCP protocol messages being sent to debug tool execution failures","I need to understand the protocol flow for a specific tool invocation","I want to verify that my MCP server is sending correctly formatted responses"],"best_for":["MCP server developers debugging protocol compliance issues","Integration engineers troubleshooting client-server communication","Protocol specification implementers validating message formats"],"limitations":["Logs are stored in browser memory only — lost on page reload or browser close","No log filtering or search functionality (must scroll through all messages)","Large message payloads (>1MB) may cause browser performance degradation","No export functionality for logs (cannot save for later analysis)","Timestamps are browser-local time, not server time (may differ if client/server in different timezones)"],"requires":["Active web UI connection to inspector-server","Browser developer console access (optional, for manual inspection)"],"input_types":["MCP protocol messages (JSON-RPC 2.0 format)"],"output_types":["Formatted protocol logs with timestamps and syntax highlighting","Structured message metadata (method, params, result, error)"],"categories":["automation-workflow","safety-moderation"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"github_mcp-modelcontextprotocol-inspector__cap_6","uri":"capability://memory.knowledge.resource.and.prompt.metadata.introspection","name":"resource and prompt metadata introspection","description":"Dynamically discovers and displays MCP server resources (files, documents, data sources) and prompts (reusable instruction templates) alongside tools. The web UI renders resource listings with descriptions and access patterns, and prompt templates with parameter placeholders. Introspection queries the server's resource and prompt endpoints on connection, populating the UI without requiring manual configuration or documentation lookup.","intents":["I want to see what resources and prompts an MCP server exposes without reading documentation","I need to understand the structure of resources before using them in tool calls","I want to discover available prompt templates and their parameters"],"best_for":["MCP server developers validating resource and prompt definitions","Users exploring server capabilities for the first time","Integration engineers understanding server-provided abstractions"],"limitations":["No resource content preview — only metadata is displayed (actual resource data requires explicit tool call)","Prompt templates are read-only in UI (cannot be edited or customized)","Large resource lists (>1000 items) may cause UI rendering lag","No filtering or search for resources/prompts (must scroll through full list)","Resource access control is not enforced by inspector — relies on server-side authorization"],"requires":["MCP server implementing resources/1.0 and prompts/1.0 protocol endpoints","Active connection to MCP server via proxy"],"input_types":["MCP server metadata (resources list, prompts list)"],"output_types":["Rendered resource listings with descriptions","Prompt template display with parameter placeholders","Resource/prompt metadata (name, description, MIME type, etc.)"],"categories":["memory-knowledge","tool-use-integration"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"github_mcp-modelcontextprotocol-inspector__cap_7","uri":"capability://automation.workflow.draggable.ui.components.for.parameter.composition","name":"draggable ui components for parameter composition","description":"React-based drag-and-drop interface for composing tool parameters and building complex inputs. Supports reordering parameters, nesting objects, and constructing arrays through visual interactions. Draggable components use React state management to track parameter changes in real-time, enabling visual parameter building without manual JSON editing. Generated parameter objects are validated against tool schemas before execution.","intents":["I want to build complex nested parameters visually without writing JSON","I need to reorder parameters or adjust complex data structures interactively","I want visual feedback on parameter validity before executing a tool"],"best_for":["Non-technical users testing MCP servers without JSON knowledge","QA engineers building complex test cases with nested parameters","Developers prototyping tool integrations with visual feedback"],"limitations":["Drag-and-drop only works for top-level parameters; nested objects have limited reordering","No undo/redo functionality — parameter changes are immediate and not reversible","Complex array structures (>50 items) may cause UI lag due to re-rendering","Validation errors are shown after submission, not in real-time as user builds parameters","No copy/paste support for parameter templates across different tools"],"requires":["React 18+ with hooks support","Browser with drag-and-drop API support (all modern browsers)","Tool schema with proper JSON Schema definitions for validation"],"input_types":["Tool parameter schema (JSON Schema format)","User drag-and-drop interactions"],"output_types":["Validated parameter object (JSON)","Schema validation errors"],"categories":["automation-workflow","tool-use-integration"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"github_mcp-modelcontextprotocol-inspector__cap_8","uri":"capability://automation.workflow.connection.state.management.with.automatic.reconnection","name":"connection state management with automatic reconnection","description":"useConnection React hook manages WebSocket/SSE connection lifecycle, including initial connection, disconnection handling, and automatic reconnection with exponential backoff. Hook maintains connection state (connected, disconnected, reconnecting) and exposes methods for sending messages and subscribing to connection events. Reconnection logic retries with increasing delays (1s, 2s, 4s, 8s, etc.) up to a maximum, preventing connection storms.","intents":["I want the web UI to automatically reconnect if the proxy server restarts","I need to handle connection failures gracefully without manual intervention","I want to display connection status to the user and retry automatically"],"best_for":["Web UI developers building resilient MCP client interfaces","Teams running inspector in environments with unstable network","Developers needing long-lived connections without manual reconnection"],"limitations":["Exponential backoff has maximum retry limit (typically 5-10 retries) — eventually gives up","No persistent state across reconnections — in-flight requests are lost","Reconnection state is not synced across multiple browser tabs (each tab reconnects independently)","No configurable backoff strategy — uses hardcoded exponential backoff","Connection timeout is fixed (typically 30s) — cannot be adjusted per connection"],"requires":["React 16.8+ (hooks support)","WebSocket or SSE transport from proxy server","Browser with WebSocket API support"],"input_types":["Connection configuration (server URL, auth token)","Message to send (JSON-RPC request)"],"output_types":["Connection state (connected, disconnected, reconnecting)","Received messages (JSON-RPC responses)","Connection events (onConnect, onDisconnect, onError)"],"categories":["automation-workflow","tool-use-integration"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"github_mcp-modelcontextprotocol-inspector__cap_9","uri":"capability://tool.use.integration.tool.execution.with.parameter.validation.and.error.handling","name":"tool execution with parameter validation and error handling","description":"Executes MCP tools by sending JSON-RPC 2.0 requests through the proxy, validating parameters against tool schemas before execution. Handles tool responses (results or errors) and displays them in the UI with formatted output. Error handling distinguishes between schema validation errors (caught before execution), protocol errors (MCP-level failures), and execution errors (tool-specific failures), providing detailed error messages for each type.","intents":["I want to execute a tool with validated parameters and see the result","I need clear error messages when tool execution fails","I want to understand why a tool call failed (schema error vs execution error)"],"best_for":["MCP server developers testing tool implementations","QA engineers validating tool behavior with various inputs","Integration engineers debugging tool failures"],"limitations":["No timeout configuration — long-running tools may hang indefinitely","No streaming output — waits for full tool result before displaying","Error messages are limited to what the server returns (may be cryptic)","No retry logic — failed executions require manual re-submission","Parameter validation only checks schema compliance, not semantic correctness"],"requires":["Active connection to MCP server via proxy","Tool schema with proper JSON Schema definitions","Valid parameters matching tool schema"],"input_types":["Tool name (string)","Tool parameters (JSON object)","Tool schema (JSON Schema format)"],"output_types":["Tool result (any JSON-serializable type)","Tool error message (string)","Validation error (schema violation details)"],"categories":["tool-use-integration","automation-workflow"],"confidence":0.5,"matches":0,"success_rate":0}],"trust":{"score":46,"verified":false,"data_access_risk":"high","permissions":["Node.js 18+","Express.js (included in server package)","MCP SDK with StdioClientTransport, SSEClientTransport, or StreamableHTTPClientTransport","MCP_PROXY_AUTH_TOKEN environment variable or URL parameter for security","Modern browser with ES2020+ support (Chrome 80+, Firefox 75+, Safari 14+)","Active connection to inspector-server proxy","MCP server with properly formatted tool/resource/prompt metadata","Node.js 16.9+","npm 8+","TypeScript 4.5+ for compilation"],"failure_modes":["Proxy adds network latency for STDIO-based servers (typically 10-50ms per round-trip)","Session token authentication is random per startup — no persistent credentials across restarts","WebSocket transport requires browser support; SSE fallback may have higher latency","No built-in load balancing for multiple concurrent MCP server connections","UI rendering performance degrades with >100 tools in a single server (no virtualization implemented)","Form generation relies on JSON Schema compliance — non-standard schemas may render incorrectly","No built-in persistence of test history across browser sessions (requires external storage)","Real-time protocol monitoring limited to current session; no log export or replay functionality","npm workspaces require Node.js 16.9+ and npm 8+ (older versions not supported)","Shared dependencies can cause version conflicts if packages require different versions","builder identity is not verified yet","no observed match outcomes yet"],"rank_breakdown":{"adoption":0.6666652923854752,"quality":0.34,"ecosystem":0.39999999999999997,"match_graph":0.25,"freshness":0.75,"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":"2026-05-24T12:16:22.065Z","last_scraped_at":"2026-05-03T14:23:31.492Z","last_commit":"2026-05-01T21:41:06Z"},"community":{"stars":9644,"forks":1294,"weekly_downloads":null,"model_downloads":null,"model_likes":null}},"distribution":{"claim_url":"https://unfragile.ai/submit?claim=mcp-modelcontextprotocol-inspector","compare_url":"https://unfragile.ai/compare?artifact=mcp-modelcontextprotocol-inspector"}},"signature":"yp0NhSz+5eTvAP0CEdLWYgg1Nc8o05NGMaiS9tDa5lGSvC+rh3Qwt8BUYTSUdfXX73Q+ZHFJRuSlNApkubgFDg==","signedAt":"2026-06-22T18:28:29.238Z","signedBy":"unfragile.ai","version":1},"_links":{"self":"https://unfragile.ai/api/v1/passport/mcp-modelcontextprotocol-inspector","artifact":"https://unfragile.ai/mcp-modelcontextprotocol-inspector","verify":"https://unfragile.ai/api/v1/verify?slug=mcp-modelcontextprotocol-inspector","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"}}