Build Your Own MCP Server!

Ever wanted Claude or ChatGPT to read your local files, write to your database, or query your custom APIs without fragile, custom-built connectors? In this step-by-step tutorial, we build a custom Model Context Protocol (MCP) server from scratch using FastMCP, test it in the MCP Inspector, and configure it directly inside Claude Desktop.

We explore the operational specifics of MCP development: how the FastMCP Python SDK reads type hints and docstrings to auto-generate JSON schemas for the LLM, how to configure the claude_desktop_config.json file, how to debug payloads inside the MCP Inspector, when to use stdio pipes versus Streamable HTTP transports, and how to scale remote deployments securely using OAuth 2.1.

📌 Timestamps:
0:00 - Introduction: Connecting Claude to Tokyo's Live Weather
0:23 - The Custom Connector Problem & The MCP Solution
0:49 - What is an MCP Server? (JSON-RPC over Pipes)
1:12 - The Three Server Primitives: Tools, Resources, and Prompts
1:32 - Step 1: Choosing Python and FastMCP
1:56 - Step 2: Ingestion (Token Chunking, Size Limits & Vector Embeddings)
2:12 - Designing Tools as Team Contracts (The Agent-Computer Interface)
2:30 - Step 3: Decorating Your First Tool with Python Type Hints
2:42 - The Magic of Docstrings: How the AI Decides to Call You
3:02 - Step 4: Booting the Server via Local Stdio Subprocesses
3:23 - Step 5: Debugging with the MCP Inspector
3:43 - Step 6: Integrating Your Server with Claude Desktop
4:02 - Step 7: Handshake Hand-offs & Automatic Tool Discovery
4:25 - Request Flow: Execution Logs & Response Validation
4:49 - Best Practices for Designing Clean MCP Tools
5:10 - How Servers Expose Tools, Resources, and Prompts
5:25 - Prompts & Templates: Standardizing Workflows
5:34 - Handling Runtime Errors & Server Crasies
5:53 - Going Remote: Switching from Stdio to Streamable HTTP
6:17 - Remote Security: Scoped Tokens and OAuth 2.1
6:45 - Deployment: Dockerizing and Shipping to the Cloud
7:06 - Hardening Your Server: Evals, Tests, and Logs
7:29 - The Mid-2026 Spec: Stateless HTTP, Extensions, and MCP Apps
7:47 - Publishing to the Official MCP Registry
8:09 - Common Mistakes to Skip (And Anthropic's Stewardship)
8:32 - Summary & Outro (Cloud Codes)

🔗 Resources & References:
- Model Context Protocol (MCP) Official Documentation (modelcontextprotocol.io)
- FastMCP Python Library Setup Guide (gofastmcp.com)

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