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Tool-call failures can originate in selection, arguments, authorization, dependencies, state, or user confirmation. This article provides an actionable taxonomy and metric design to turn vague Agent errors into fixable engineering problems.
Passing the latest validator does not mean legacy Agents, renderers, and audit jobs still in production can read a new result. This article combines producer revisions, the real consumer set, decoding proofs, and representation routing into a compatibility gate purpose-built for tool results.