Vercel releases course on building an AI coding agent harness from scratch
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Vercel has released the course "Build Your Own AI Coding Agent Harness," teaching learners to build a TypeScript coding agent harness called TeensyCode from scratch, which includes tools such as read, grep, write, edit, bash, task, and askUser. The course requires learners to have a foundation in TypeScript, async/await, and basic terminal operations; the runtime environment is Node.js 22+ or Bun, and the AI_GATEWAY_API_KEY environment variable must be configured.
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- Hacker News AIBuild Your Own AI Coding Agent Harness
This course walks through building TeensyCode, a TypeScript AI coding agent harness with a tool loop (read, grep, write, edit, bash, task, askUser), execute-level safety gates, structured system prompts, and a swappable Sandbox interface with local and in-memory backends. It also covers context management via pruneMessages and bounded tool output, subagent delegation, human-in-the-loop questions, sandbox lifecycle, and extensibility, across 11 modules plus a capstone. Prerequisites include TypeScript, an AI_GATEWAY_API_KEY, and Node.js 22+ or Bun.
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