Vercel Academy Publishes Course on Building an AI Coding Agent Harness
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Vercel Academy published an 11-module course that walks learners through building TeensyCode, a working AI coding agent harness in TypeScript, starting from an empty tool loop and ending with sandbox backends, subagents and a web surface. The course adds tools incrementally: read and grep first, then bash behind execute-level safety gates. It covers a Sandbox interface with local, in-memory (just-bash) and cloud implementations, context pruning with bounded tool output and cache control, and Explorer and Executor subagents with isolated context. Modules 1–6 are build-along; Module 7 is conceptual, covering sandbox lifecycle and durable workflows; the capstone runs the harness against a real project. Prerequisites are TypeScript, async/await, basic terminal experience, Node.js 22+ or Bun, and an AI_GATEWAY_API_KEY environment variable.
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- Hacker News · AIVercel Academy course teaches building an AI coding agent harness from scratch
Vercel Academy published an 11-module course that builds TeensyCode, a working AI coding agent harness in TypeScript, from an empty tool loop up to sandbox backends, subagents and a web surface. The course adds tools step by step, starting with read and grep and then bash behind execute-level safety gates, and covers a Sandbox interface with local, in-memory (just-bash) and cloud implementations, context pruning with bounded tool output and cache control, and Explorer and Executor subagents with isolated context. Modules 1 through 6 are build-along, Module 7 is concept and analysis on sandbox lifecycle and durable workflows, and the capstone runs the harness against a real project; prerequisites are TypeScript, Node.js 22+ or Bun, and an AI_GATEWAY_API_KEY.
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