Firecrawl added its Developer Index to the Firecrawl plugin for Grok Build. According to the post, Grok can search more than 70 million primary sources across repositories, documentation and issues to check APIs and find fixes as it codes, and users enable it by running /plugin and installing Firecrawl.
Grounding a coding agent in retrieved docs and issue threads can reduce guessed API signatures. The post does not say how often the index is refreshed or whether results match the API version a project uses.