The Explore agent is a "Fast agent" optimized for codebase exploration,
not deep reasoning. The skill-stocktake V4 design requires holistic AI
judgment (actionability, scope fit, uniqueness, currency) which needs
the full reasoning capability of the conversation's main model.
Additionally, the Agent tool has no `model` parameter — specifying
`model: opus` was silently ignored, causing the evaluation to run on
the lightweight Explore model. This resulted in all skills receiving
"Keep" verdicts without genuine critical analysis.
Changing to `general-purpose` agent ensures evaluation runs on the
conversation's main model (e.g., Opus 4.6), enabling the holistic
judgment that V4 was designed for.
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