Vibe Coding Codex · CH 4

Harness Engineering Architecture

Engineering repository context and test runners around LLM black boxes

⏱️ 9 min read·Updated Jul 2026

Chapter 4: Harness Engineering Architecture

Harness Engineering holds the chosen LLM constant as a black box and focuses 100% of engineering effort on repository context, non-functional requirements in code, and automated test runners.

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The Four Layers of a Harness

    • Recoverable Intent: AGENTS.md and CLAUDE.md context rules.
    • Non-Functional Requirements: Linters and type checkers.
    • Verification: Executable test suites (evals/).
    • Cumulative Memory: Capturing bug fix corrections back into repo playbooks.

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