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Claude Certified Architect - Foundations (CCAR-F) · Anthropic
Select one answer.
Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.
isError is for actual erros.
Option D makes that difference explicit. A result like {"success": true, "results": [], "total_matches": 0} clearly tells Claude the tool ran correctly and the answer is “no matches.” isError: true is kept for real failures, so when it does appear, Claude can trust that it means retrying might help. Each signal means one thing, so Claude can act correctly on both.
The root cause of the agent's retry behavior is a semantic conflation problem: the tool is likely signaling "zero results" in a way that looks indistinguishable from "the search failed." Claude is pattern-matching on ambiguous signals and reasonably concluding that retry is the appropriate recovery action