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You Could've Invented Claude Code

This is cross-posted from the original x post.

What makes Claude Code powerful is surprisingly simple: it's a loop that lets an AI read files, run commands, and iterate until a task is done.

The complexity comes from handling edge cases, building a good UX, and integrating with real development workflows.

In this post, I'll start from scratch and build up to Claude Code's architecture step by step, showing how you could have invented it yourself from first principles, using nothing but a terminal, an LLM API, and the desire to make AI actually useful.

Building AI agents with the Claude Agent SDK

If you've used Claude Code, you've seen what an AI agent can actually do—read files, run commands, edit code, figure out the steps to accomplish a task.

And you know it doesn't just help you write code, it takes ownership of problems and works through them the way a thoughtful engineer would.

The Claude Agent SDK is the same engine, yours to point at whatever problem you want, so you can easily build agents of your own.

The Claude Agent SDK is how you build that same thing into your own applications.

Create an OpenAI inference component based on the ETH Price Oracle (components/eth-price-oracle). The component should:

Accept input in the format 'PROMPT|OPENAI_API_KEY|SEED' from a Makefile parameter
Use fetch_json and http_request_post_json for API communication
Return and log only choices[0].message.content and choices[0].finish_reason
Include proper input validation and SEED should be an integer
Use the main makefile, do not create a separate one.

Important Implementation Details:

I want to create a similar oracle to the ETH Price Oracle at components/eth-price-oracle, but I want it to use the SportRadar API.

I want to set and reference the SportRadar API key from the Makefile, I do not want to use an .env file..

The request parameters for calling the SportRadar API look like this:

curl --request GET \
     --url 'https://api.sportradar.com/ncaamb/trial/v8/en/games/fa15684d-0966-46e7-a3f8-f1d378692109/boxscore.json?api_key={insert-api-key} \
     --header 'accept: application/json'

How to Give THE Killer Pitch or Hackathon Demo

Examples

Here are some high quality demo day pitches for reference

Lattice YC Demo Day Pitch (W16)

Ottimate

	import Anthropic from "@anthropic-ai/sdk";
	import { Pool } from "pg";

	const anthropic = new Anthropic();

	// dn connection - Claude never sees this
	const db = new Pool({
	host: "your-database-host.com",
	port: 5432,
	database: "sales_db",

	import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
	import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
	import { z } from "zod";
	import 'dotenv/config'

	const server = new McpServer({
	name: "EigenLayer AVS service",
	version: "1.0.0",
	});

	const baseInstructions = `

	You do not like NFTs, so don't talk about them. Never use the word Buidl.

	You are a hyper-optimist while also being a skeptic.

	Everything always lowercase unless it absolutely has to be for the sake of emphasis or similar.

	Never use emojis.

	'use client'

	import Capsule, {
	Environment,
	CapsuleModal,
	} from '@usecapsule/react-sdk';
	import { useState, useEffect } from 'react'

	const capsule = new Capsule(
	Environment.BETA,