@modelcontextprotocol/inspector-server
MCP ServerFreeServer-side application for the Model Context Protocol inspector
Capabilities5 decomposed
mcp server introspection and schema discovery
Medium confidenceProvides runtime inspection of Model Context Protocol servers by exposing their resource definitions, tool schemas, and prompt templates through a standardized introspection API. The inspector server acts as a middleware that intercepts and catalogs MCP server capabilities without modifying the underlying server implementation, enabling dynamic discovery of available functions, their parameter schemas, and documentation.
Implements MCP-native introspection as a first-class server capability rather than a generic reflection layer, leveraging the protocol's built-in resource and tool listing mechanisms to provide protocol-aware schema discovery without requiring custom reflection APIs.
Provides MCP-specific introspection that understands protocol semantics (resources, tools, prompts) versus generic reflection tools that treat MCP servers as black boxes.
interactive mcp server debugging and testing interface
Medium confidenceExposes a web-based or CLI interface for developers to manually invoke MCP server tools, read resources, and test prompt templates in real-time without writing client code. The inspector server translates user interactions into MCP protocol messages, executes them against the target server, and displays results with full request/response logging for debugging.
Provides a dedicated debugging interface for MCP protocol interactions rather than requiring developers to write custom client code or use generic HTTP clients, with protocol-aware request/response formatting and logging.
More ergonomic than using curl or Postman for MCP testing because it understands MCP message structure and automatically formats requests according to the protocol specification.
mcp protocol message logging and request/response tracing
Medium confidenceCaptures and logs all MCP protocol messages (requests, responses, notifications) exchanged between the inspector server and target MCP servers, with timestamps, message types, and full payload inspection. Enables developers to trace the complete lifecycle of tool invocations, resource reads, and prompt evaluations for debugging protocol compliance and performance analysis.
Implements protocol-level message tracing that captures the complete MCP JSON-RPC exchange, including request IDs and correlation data, enabling full request/response matching and latency analysis.
More detailed than generic network packet capture because it understands MCP message semantics and can correlate requests with responses using JSON-RPC message IDs.
dynamic mcp server capability validation and schema conformance checking
Medium confidenceValidates that an MCP server's exposed tools, resources, and prompts conform to the MCP specification by checking schema structure, parameter types, and required fields. The inspector server performs static schema validation and can optionally execute test invocations to verify runtime behavior matches declared schemas.
Implements MCP-specific schema validation that understands the protocol's tool, resource, and prompt definitions, checking for spec compliance rather than generic JSON schema validation.
More targeted than generic JSON schema validators because it validates against the MCP specification and can check protocol-specific constraints like resource URI formats and tool parameter requirements.
mcp server connection management and transport abstraction
Medium confidenceManages connections to MCP servers across multiple transport types (stdio, SSE, WebSocket) with automatic reconnection, connection pooling, and transport-agnostic client APIs. The inspector server abstracts transport details so developers can interact with MCP servers without managing connection lifecycle or transport-specific code.
Provides a unified client API that abstracts MCP transport details (stdio, SSE, WebSocket) behind a single interface, with built-in reconnection logic and connection pooling.
Simpler than managing MCP connections manually because it handles transport-specific details, reconnection, and pooling automatically.
Capabilities are decomposed by AI analysis. Each maps to specific user intents and improves with match feedback.
Related Artifactssharing capabilities
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@modelcontextprotocol/inspector-cli
CLI for the Model Context Protocol inspector
@mcp-use/inspector
MCP Inspector - A tool for inspecting and debugging MCP servers
mcp-use
The fullstack MCP framework to develop MCP Apps for ChatGPT / Claude & MCP Servers for AI Agents.
@modelcontextprotocol/inspector-client
Client-side application for the Model Context Protocol inspector
@modelcontextprotocol/inspector
Model Context Protocol inspector
mcp-client
** MCP REST API and CLI client for interacting with MCP servers, supports OpenAI, Claude, Gemini, Ollama etc.
Best For
- ✓MCP client developers building dynamic integrations with multiple MCP servers
- ✓AI agent builders needing runtime capability discovery for tool orchestration
- ✓Teams debugging MCP server deployments and validating schema correctness
- ✓MCP server developers testing tools and resources during development
- ✓DevOps engineers validating MCP server deployments in staging environments
- ✓AI engineers debugging tool invocation failures in agent workflows
- ✓MCP server developers debugging protocol implementation issues
- ✓Security teams auditing MCP server operations and access patterns
Known Limitations
- ⚠Requires the target MCP server to be running and accessible — cannot inspect offline or archived servers
- ⚠Introspection is read-only; cannot modify server schemas or capabilities through the inspector
- ⚠Performance depends on MCP server response time; large schema catalogs may introduce latency in discovery operations
- ⚠Interactive testing is synchronous — long-running tools block the interface until completion
- ⚠No built-in support for testing stateful tool sequences that depend on previous invocation results
- ⚠Limited to tools and resources exposed by the MCP server; cannot test internal server logic or middleware
Requirements
Input / Output
UnfragileRank
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Server-side application for the Model Context Protocol inspector
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