Tanguy Patte contributed to the envoyproxy/gateway repository by enhancing the security policy documentation, specifically clarifying the correct usage of CORS allowOrigins. He updated the Markdown-based documentation to specify that allowOrigins must be an array of strings, addressing a common source of misconfiguration. Through technical writing and careful documentation, Tanguy improved developer guidance and onboarding materials related to security policies. His work focused on making policy examples clearer and more accurate, ensuring that developers can implement CORS settings correctly. While the contribution was limited to documentation, it demonstrated attention to detail and a solid understanding of both Markdown and security concepts.