RepoFinder turns a project and a goal into a short list of open source tools that genuinely fit, then lets you interrogate every pick. Built entirely with OpenAI Codex on the Responses API: gpt-5.6-luna for extraction, gpt-5.6-terra for ranking and chat, strict JSON Schema outputs, a labeled fallback, a remote MCP tool, and 15 checked-in lessons on how Codex actually works.
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