PRODUCTION SCENARIO
Your fleet-monitoring agent checks the health endpoint of 60 regional servers on every run and reports only the ones returning errors. Each check is a separate model round trip today, and every raw health payload lands in the context window.
Which change cuts the round trips and keeps the raw payloads out of the model's context?
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Answer: Give the health tool allowed_callers for code execution so one script runs and filters all 60 checks
Programmatic tool calling has Claude write one script in the code execution container that calls the tool in a loop, filters the results, and returns only the failures. Intermediate tool results never enter the context window, which is why fan-out across many items is the pattern's strongest fit. Parallel tool use would still drop all 60 payloads into context.