Ref is an MCP server for providing context to coding agents. For this project I explored adding code base indexing. GPT5 wrote a vectordb, graphdb and text-search index for code that run in a local MCP server. It then wrote a benchmark to evaluate performance and optimized for it. Then, of course, rewrote to Rust. I also explored GPT5's UI generation using Goose + mcp-ui to have GPT5 generate UI on the fly to visualize the codebase.
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