@modelcontextprotocol/inspector-cli
MCP ServerFreeCLI for the Model Context Protocol inspector
Capabilities6 decomposed
mcp server connection inspection and debugging
Medium confidenceProvides a CLI-based interactive interface to connect to and inspect Model Context Protocol servers, allowing developers to test server implementations, verify protocol compliance, and debug communication flows. Uses a stdio-based transport layer to establish bidirectional communication with MCP servers and exposes a REPL-like environment for sending requests and observing responses in real-time.
Purpose-built inspector specifically for the Model Context Protocol standard, providing native understanding of MCP message schemas, tool/resource/prompt discovery, and protocol-specific debugging patterns rather than generic JSON-RPC inspection
More specialized for MCP workflows than generic JSON-RPC debuggers, with built-in awareness of MCP server capabilities and protocol semantics
interactive mcp capability discovery and enumeration
Medium confidenceAutomatically discovers and displays all tools, resources, and prompts exposed by a connected MCP server through introspection queries. Parses server responses to the list_tools, list_resources, and list_prompts protocol methods and presents them in a human-readable format with full schema information, allowing developers to understand server capabilities without reading documentation.
Implements MCP-native introspection using the protocol's built-in discovery methods (list_tools, list_resources, list_prompts) rather than attempting generic reflection, ensuring accurate representation of what the server actually advertises
Provides protocol-native capability discovery that respects server-defined schemas and descriptions, unlike generic API explorers that might misinterpret MCP semantics
interactive tool invocation and testing
Medium confidenceAllows developers to manually invoke tools exposed by an MCP server through an interactive REPL interface, passing arguments and observing results in real-time. Handles JSON argument serialization, error handling, and response formatting to enable quick testing of tool behavior without writing client code.
Provides a direct REPL-based tool invocation interface that respects MCP tool schemas and handles the full request/response cycle, including proper JSON serialization and error propagation from the server
More direct and schema-aware than generic curl/HTTP clients, with built-in understanding of MCP tool contracts and error handling
real-time protocol message inspection and logging
Medium confidenceCaptures and displays all JSON-RPC messages exchanged between the inspector and the MCP server, including requests, responses, and notifications. Provides formatted output with timestamps and message direction indicators, enabling developers to understand the exact protocol flow and diagnose communication issues at the message level.
Implements transparent message interception at the stdio transport layer, capturing all JSON-RPC traffic without modifying protocol behavior, and formats output specifically for MCP message structure and semantics
More transparent than network-level packet inspection, with MCP-aware formatting and message interpretation that generic JSON loggers cannot provide
server lifecycle management and spawning
Medium confidenceHandles spawning and managing the lifecycle of MCP server processes, including process creation, stdio stream management, and graceful shutdown. Accepts server command and arguments, establishes stdio-based communication channels, and manages process cleanup on exit.
Integrates server spawning directly into the inspector workflow, managing the full process lifecycle from creation through stdio communication to graceful termination, eliminating the need for separate process management
Simpler than manual process management or generic process runners, with built-in understanding of MCP server requirements and stdio communication patterns
mcp protocol version negotiation and compatibility checking
Medium confidenceAutomatically negotiates protocol version with the connected MCP server during initialization, verifying compatibility and establishing the protocol version to be used for subsequent communication. Implements the initialize handshake defined in the MCP specification, exchanging client and server capabilities and protocol version information.
Implements the MCP initialize handshake protocol, exchanging structured capability information and protocol version metadata to establish a compatible communication contract before any tool invocation
Protocol-native version negotiation that respects MCP semantics, unlike generic JSON-RPC clients that might not implement proper capability exchange
Capabilities are decomposed by AI analysis. Each maps to specific user intents and improves with match feedback.
Related Artifactssharing capabilities
Artifacts that share capabilities with @modelcontextprotocol/inspector-cli, ranked by overlap. Discovered automatically through the match graph.
@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.
@wong2/mcp-cli
A CLI inspector for the Model Context Protocol
@modelcontextprotocol/inspector-server
Server-side application for the Model Context Protocol inspector
@modelcontextprotocol/inspector
Model Context Protocol inspector
LiteMCP
** - A TypeScript framework for building MCP servers elegantly
Best For
- ✓MCP server developers building custom integrations
- ✓teams implementing Model Context Protocol clients
- ✓developers troubleshooting MCP server deployments
- ✓MCP server developers validating capability advertisement
- ✓integration engineers discovering available server functionality
- ✓QA teams verifying server capability completeness
- ✓MCP server developers testing tool implementations
- ✓integration engineers validating tool behavior before deployment
Known Limitations
- ⚠CLI-only interface — no programmatic API for automation or integration into test suites
- ⚠Single server connection at a time — cannot compare behavior across multiple server instances simultaneously
- ⚠No built-in request recording or replay functionality for regression testing
- ⚠Limited to stdio transport — cannot directly test HTTP or WebSocket MCP transports
- ⚠Read-only discovery — cannot modify or add capabilities through the inspector
- ⚠No filtering or search functionality — must manually scan through all capabilities
Requirements
Input / Output
UnfragileRank
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Package Details
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CLI for the Model Context Protocol inspector
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