Worked on the withastro/astro repository to enhance SEO reliability by addressing a bug where server island components were being indexed as standalone pages. Implemented a targeted backend solution using JavaScript and TypeScript, adding X-Robots-Tag: noindex headers to server island responses to prevent search engines from indexing these internal components. This approach ensured that only intended top-level pages appeared in search results, reducing noise and maintaining page quality. The change was isolated to HTTP headers, introducing no performance regressions or rendering changes, and included thorough documentation for future header-based controls and testing, reflecting a careful and maintainable engineering process.