Why Codex Does Not Give the Model Every Tool
A plain-language, source-grounded explanation of why Codex loads tools on demand, how BM25 ranks the best few, and how the same design transfers to Python, Go, and other models.
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Five Codex Harness Designs Worth Copying
A source-grounded analysis of selective parallelism, Unified Exec, ExecCell, progressive Skills, persistent Goal continuation, and embedding the runtime through App Server.