6 lessons

Build Your First Business MCP

Learn Codex by Creating an MCP for Business Data

One practical path: use the Codex app to turn a RapidAPI business-data endpoint into a stable local MCP server for a real operator workflow.

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Lessons

1

What Codex Uses MCP For

Understand how Codex uses MCP tools and its MCP-building skill to make business workflows repeatable.

10 min
2

Scaffold an MCP Server

Use the Codex MCP-building skill to plan a minimal TypeScript server, then scaffold it locally.

20 min
3

Add a Business Search Tool

Connect RapidAPI Local Business Data with Zod input validation and machine-readable output.

25 min
4

Connect the Server to Codex

Register the server in the Codex app, inspect the MCP settings, and invoke the tool from chat.

15 min
5

Test, Debug, Iterate

Use Inspector, Codex config checks, and stderr logs to diagnose API, schema, and prompt failures.

25 min
6

Ship and Extend

Document the tool contract, safety model, evidence loop, and next useful tools.

10 min