The Codex Startup Pressure Test Skill is an npm package that installs a specialized skill for the OpenAI Codex AI assistant. Once installed, the skill enables users to pressure-test startup ideas by invoking it within Codex prompts, which then generates a structured evaluation covering verdict, scorecard, core assumptions, flaws, and actionable steps for validation. The architecture consists of a skill directory containing markdown-based instructions (SKILL.md and playbooks.md) that define the skill's behavior, an interface configuration for OpenAI (agents/openai.yaml), and an installer script (scripts/install.js) that handles deployment to the user's Codex skills directory. The skill relies on Codex's natural language processing to perform the actual analysis, with the repository providing the domain-specific guidance and framing. Key strengths include the well-documented skill framework that captures proven startup evaluation methodologies and the reusable installer script, which demonstrates solid CLI engineering practices with argument parsing, path handling, and recursive directory copying. The project is actively maintained and shows no signs of technical debt, depending only on Node.js built-in modules.