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mcp-debug
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mcp-debug

Active·★ 37·Apache-2.0·Updated 2026-10-22

`mcp-debug` is a command-line tool designed for debugging Model Context Protocol (MCP) servers. It allows developers to inspect server capabilities, debug tool integrations, and test server notifications, offering features like OAuth 2.1 authentication and an interactive REPL.

#CLI#Debugging#MCP#Protocol Inspection#OAuth#Interactive Shell#AI Tooling
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Guides
#Server Emulation
$ Install
$ go install github.com/giantswarm/mcp-debug@latest
↗ Visit site★ GitHub
01

Features

01Connect to any MCP Server using `streamable-http` transport.
02Full OAuth 2.1 Authentication compliance with automatic discovery, resource indicators, and PKCE validation.
03Interactive REPL to explore available tools, resources, and prompts.
04Acts as an MCP server itself, enabling integration with AI assistants.
05Verbose logging of JSON-RPC messages for in-depth debugging and shell autocompletion.
02

Compatibility

Go
Language
Verified via docs
CLI
Interface
Verified via docs
03

Quick start

1
$ go install github.com/giantswarm/mcp-debug@latest
04

Use cases

↳Debugging and inspecting the capabilities and behavior of MCP servers.
↳Testing and integrating custom tools with MCP servers.
↳Running as an MCP server to enable integration with AI assistants like Cursor.
↳Interactively exploring and understanding the available tools, resources, and prompts on an MCP server.
↳Analyzing detailed JSON-RPC message flows for troubleshooting and protocol adherence.
05

Alternatives

⚡Top VS:
VSmcp-stdio-guard★10→VStiger-cli★126→VSnoxctl★16→

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giantswarm /
mcp-debug
↗

Command-line tool for debugging MCP servers

37Apache-2.0
Last commit1d ago
StatusActive
CategoryDev Tooling
Links
Documentation↗Discussion↗Issues↗Releases↗
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