MCP Inspector Explained: Test & Debug Your MCP Server with FastMCP

Don’t connect your MCP server to an AI blindly—test, debug, and break it first with MCP Inspector! In this video, learn how to connect, test, and debug MCP servers using MCP Inspector with real Calculator and Weather MCP servers. 🔹 Discover and run MCP tools 🔹 Test Streamable HTTP & SSE 🔹 Handle errors and external API failures 🔹 Write better docstrings for LLM tool selection 🔹 Use API secrets, timeouts, and graceful error handling 🔹 Understand multi-server MCP architecture By the end, you’ll know how to build, test, break, and validate MCP tools before connecting them to an AI client. 👍 Like & Subscribe for more MCP and AI engineering tutorials! #MCP #ModelContextProtocol #MCPInspector #FastMCP #Python #AIAgents #LLM #aiengineering TIMESTAMPS: 00:00 MCP Inspector 01:26 Handshake & Discovery 02:21 Node.js Setup 03:08 Inspector Setup 04:43 Calculator Testing 05:46 Weather Server 07:30 API Error Handling 10:17 Multi-Server Architecture 12:35 Key Lessons 16:40 AI Client Integration