You'll notice
Task tool now errors instead of silently defaulting to a general-purpose agent when no subagent_type is given
The Task tool now requires an explicit subagent_type. Omitting it produces the error "subagent_type is required: the general-purpose agent is not available in this session" instead of silently falling back to a general-purpose agent.
Names in the bundlesubagent_type
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Anthropic's release notes agree
Fixed the Agent tool advertising a general-purpose default in sessions where that agent is unavailable: an omitted subagent_type there now…