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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#Tool Calling
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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.
Claude's Tool Calling Paradigm Shift
Anthropic's Programmatic Tool Calling and Dynamic Filtering aren't just feature additions — they represent a paradigm shift in Agent architecture: from natural language orchestration to code-driven orchestration, from full context injection to on-demand filtering. Synthesizing multiple non-AI-written deep-dive articles, this post covers architecture, benchmarks, and production patterns.