MCPJam

MCPJam

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Local inspector and testing tool for MCP servers and ChatGPT/MCP apps: widget emulator, LLM playground, inspect tools, prompts, OAuth, and STDIO/SSE/HTTP protocols.

Desktop App for Mac, Windows (PC)

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MCPJam is a developer tool designed for testing and debugging MCP (Model Context Protocol) servers. It supports STDIO, SSE, and Streamable HTTP protocols, enabling efficient inspection of server interactions without requiring external data files.[1]

Key capabilities include MCP server inspection, tool testing, and protocol validation, making it suitable for developers building integrations with MCP clients such as Claude, ChatGPT, VS Code, and others.[1][2][3] Users can simulate reactions like upvoting or downvoting comments, configure output formats (text or JSON), and manage pagination options such as page size, sorting by criteria like createdAt or installCount, and locale settings.[1]

This tool facilitates quick iteration during MCP app development, where apps extend the protocol to render interactive UI elements inline within conversations.[2][3][5] By providing a hybrid connection type and command-line arguments for tasks like comment ID processing, MCPJam streamlines workflows for LLM integrations and custom server setups.[1][4]

Website: mcpjam.com

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