The official tool for testing and debugging MCP servers, with a web UI, a CLI and a terminal UI.
npx @modelcontextprotocol/inspectorMCP Inspector connects to any MCP server and shows what it offers: tools, resources and prompts. You can call each tool by hand and see the requests and responses.
npx @modelcontextprotocol/inspector
npx @modelcontextprotocol/inspector --cli
npx @modelcontextprotocol/inspector --tui
The first command opens the web UI. The other two give a CLI for scripts and a terminal UI.
Prefect · Tool / CLI
The fast, Pythonic way to build MCP servers and clients, now a full MCP application framework from Prefect.
Promptfoo · Tool / CLI
Test and compare prompts, agents and RAG pipelines, and red-team them for security problems, from the command line.
Anthropic · Skill
The Anthropic skill that guides Claude through designing and building high-quality MCP servers in Python or TypeScript.