How this list is maintained. Really Good GEO reviews each source before publishing a claim that depends on it. The "last reviewed" date on each entry is the date the linked page was checked for currency. Publisher documentation changes; if you notice a link that no longer supports a Field Guide claim, please email hello@reallygoodgeo.ai.
OpenAI
- GPTBot — Publisher: OpenAI · Description: official documentation for OpenAI's GPTBot web crawler, including how site owners restrict access via robots.txt · Last reviewed: 2026-08-28
- Web search tool — Publisher: OpenAI · Description: developer documentation for the OpenAI web-search tool, including citation return in responses · Last reviewed: 2026-08-28
Anthropic
- Web search tool — Publisher: Anthropic · Description: developer documentation for Claude's web-search tool, including citation handling · Last reviewed: 2026-08-28
- Structured data — Publisher: Google · Description: official documentation for structured data (schema.org markup) supported by Google Search, including which types are eligible for enhanced appearances · Last reviewed: 2026-08-28
- Google crawlers overview — Publisher: Google · Description: list of Google's crawler user-agents, including Google-Extended · Last reviewed: 2026-08-28
- An update on web publisher controls — Publisher: Google · Description: announcement of Google-Extended as a robots.txt-controllable user-agent for AI training and Gemini · Last reviewed: 2026-08-28
Perplexity
- Perplexity bots — Publisher: Perplexity · Description: documentation for Perplexity's user-agents and robots.txt controls · Last reviewed: 2026-08-28
Standards
- Schema.org — Publisher: schema.org (joint founding sponsors Google, Microsoft, Yahoo, Yandex) · Description: shared vocabulary for structured data on the web · Last reviewed: 2026-08-28
- The Robots Exclusion Protocol — Publisher: robotstxt.org · Description: the robots.txt convention and its rules · Last reviewed: 2026-08-28
What this list is not. This is not an endorsement of any product or ranking of engines. The entries here are the specific documents Really Good GEO relies on when a Field Guide page states an externally verifiable fact about a product's behavior, a crawler, or a standard. RGG frameworks and testing protocols are attributed to Really Good GEO directly, not to these sources.