Open-source course teaches harness engineering by building Claude Code from scratch: 8 articles, 6 videos
kalyan_kpl · x · 2026-10-26
An open-source course (8 articles, 6 videos, 1 codebase) teaches harness engineering by building a Claude Code-style coding agent from scratch — a skill the author argues transfers to building any AI product in finance, medicine, or e-commerce.
Coverage includes: designing a coding agent harness and headless agent loop; attaching it to a terminal UI, CLI, or remote runtime; running tools in local Docker or Modal sandboxes; hosting open-source models as SGLang servers on Modal; guardrails via a permission layer; context engineering (memory, compaction, skills); hooking up an LSP server for faster feedback; plus evals and observability with benchmarks, regressions, and replays.
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