40-Minute Tutorial Builds a Feature-Rich Coding Agent Harness From Scratch
Roger_M_Taylor · x · 2026-09-15
Developer neuralavb released a 40-minute tutorial on building a feature-rich coding agent harness from scratch with no frameworks. It covers tool calls, bash execution, file reads/writes and patch updates, cache-aware prompting, compaction and context management, late injections, TODOs and plans, permissions, sandboxes, and subagents — a hands-on guide for anyone wanting to understand or build an agent runtime themselves.
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