Harness Engineering 101
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Ranked by a public rubric, not by votes: what a comment adds counts, not who wrote it. How comments are ranked · Comment rules
Summary
Isuru Wijesiri, who built WSO2's MI and BI Copilots and the Claude Code rebuild One Code, has published "Harness Engineering 101," a book arguing that agents are a loop around a stateless LLM API, with each feature patching a concrete failure. It covers tools, caching, context limits, subagents, MCP and RAG, and builds a roughly 300-line Python coding agent with no dependencies. The framing is the author's own, drawn from his experience, and is not independently sourced.