llms.txt provided effective entry-point discovery

Both models found and used github.com/llms.txt. It provided a structured overview of GitHub's five integration surfaces (REST API, GraphQL API, CLI, MCP server, GitHub Actions) with categorised links to documentation. Sonnet described it as "clearly designed for exactly this kind of machine consumption." The file also listed programmatic documentation APIs (/api/pagelist, /api/article, /api/search) that Sonnet's sub-agents used as supplementary sources. Neither model found llms-full.txt (Sonnet checked; 404). The OpenAPI spec exists in a separate repository (github/rest-api-description) but the JSON file exceeded 10MB and could not be fetched directly by the agent's tools.