A Coding Agent from Scratch

A series about building a coding agent from first principles — no framework, no magic. Just a model, a loop, and a handful of tools. Seven parts are planned:

1. The whole secret is a while loopplanned
2. Before function callingplanned
3. Tool calls with nothing but a promptplanned
4. A working agent in ~100 linesplanned
5. The three tools of a coding agentplanned
6. When the context window fills upplanned
7. MCP, subagents, and sandboxesplanned