Set up and improve harness engineering (AGENTS.md, docs/, lint rules, eval systems, project-level prompt engineering) for AI-agent-friendly codebases. Triggers on: new/empty project setup for AI agents, AGENTS.md or CLAUDE.md creation, harness engineering questions, making agents work better on a codebase. ALSO triggers when users are frustrated or complaining about agent quality — e.g. 'the agent keeps ignoring conventions', 'it never follows instructions', 'why does it keep doing X', 'the agent is broken' — because poor agent output almost always signals harness gaps, not model problems. Covers: context engineering, architectural constraints, multi-agent coordination, evaluation, long-running agent harness, and diagnosis of agent quality issues.
为 AI Agent 友好的代码库搭建和改进 Harness 工程（包括 AGENTS.md、docs/、Lint 规则、Eval 系统、项目级 Prompt 工程）。触发场景：为 AI Agent 设置新项目/空项目，创建 AGENTS.md 或 CLAUDE.md，关于 Harness 工程的问题，让 Agent 在代码库上更高效地工作。当用户感到沮丧或抱怨 Agent 质量时也会触发（例如：'Agent 总是无视规范'、'它从不听从指令'、'为什么它总是做错 X'、'Agent 坏了'）— 因为 Agent 输出质量差几乎总是意味着 Harness 缺失，而不是模型问题。涵盖：Context 工程、架构约束、多 Agent 协作、评估、长运行任务 Harness 以及 Agent 质量问题诊断。