Your Next Startup in 20 Minutes: MCP Day Planner with Real APIs

Want a real AI product you can demo today? In this build, we create a Node.js MCP (Model Context Protocol) server that plans your day using live weather, public holidays, real-time currency conversion, and a configurable LLM—all behind a portable tool layer you can reuse across editors, agents, and chat UIs with zero rewiring.

Why this matters
One tool layer → many clients: define tools once (Weather/Holidays/FX/Planner), call them from any MCP-aware client (Inspector, editor agent, chat UI, bot).

Startup-ready MVP: no API keys for core data; Zod validation, retries + timeouts, pino logging baked in.

Vendor-agnostic AI: switch OpenAI / OpenRouter / DeepSeek via .env—no code changes.

Chapters
0:00 – Intro
1:02 – Project setup
3:51 – Implementing LLM client
9:10 – Build API integrations
9:19 – Weather tool (Open-Meteo)
11:05 – Holiday tool (Nager.Date)
12:16 – Currency tool (Frankfurter)
13:28 – Planner tool (multi-LLM orchestration)
16:30 - Testing the setup
19:30 – Final thoughts

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