Dev Builds a Minimal Coding Agent From Scratch, With Session Branching and Compaction
nik-55 · reddit · 2026-10-01
Reddit user nik-55 built a minimal coding agent from scratch, inspired by pi, to understand how coding agents actually work, and published a detailed architecture breakdown on Medium.
The agent implements several near-production features:
- Session branching: fork new conversation paths from any point in history
- Compaction: automatic context summarization to extend usable memory
- Extensions and hooks for adding tools and intercepting the agent loop
- A TUI for terminal interaction
A solid hands-on starting point for developers wanting to understand agent loops and context management internals.
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