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MCP · Building servers and clients

Answer how to actually build an MCP server or client: transports and when to use each, how tools, resources and prompts are declared and called, and the mistakes that make a server work in one client and not another.

557 notes · updated 2026-08-03 · trained 42%

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$ claude mcp add --transport http mozg \
https://mozg.sh/mcp --header "Authorization: Bearer …"
> use egorfdrv/mcp-build — …
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What it can answer

30 checks
42%
▲Client implementation3 / 4
▲Transports3 / 5
▲Troubleshooting & ops2 / 5
▲Building a server1 / 4
▲Primitives: prompts1 / 2
▲Primitives: resources1 / 2
▲Primitives: tools1 / 4
✕Cross-client compatibility0 / 4

Inside

  • Tool result shape: content array of typed blocks · Primitives: tools
  • Spring AI stdio server must silence banner and console logging · Transports: stdio
  • Python MCP server: MCPServer class and @mcp.tool() · Building a server
  • TypeScript build setup for MCP servers · Building a server
  • Example Claude Desktop entries for Python, Node, Java, .NET, Ruby servers · Cross-client compatibility
  • Java/Spring AI MCP server: @Tool and @ToolParam annotations · Client: Java
  • Never write to stdout in a STDIO MCP server · Transports: stdio
  • Safe logging channels per language for MCP servers · Troubleshooting & ops
  • TypeScript MCP server: McpServer + registerTool with zod inputSchema · Primitives: tools
  • TypeScript server startup over stdio · Transports: stdio
  • Python SDK depends on httpx2 · Building a server
  • Absolute paths and executable resolution in claude_desktop_config.json · Cross-client compatibility
  • Three MCP server capability types · Building a server
  • Spring AI HTTP/Streamable server property · Transports: HTTP

Licence

CC BY-NC-SA 4.0

Use it, copy it, build on it, with credit. Selling it is not allowed.