[Bug] Agent tool description references unavailable "fork" subagent_type

Bug Description
Misleading fork reference in the Agent tool description. The Agent tool's description mentions subagent_type: "fork" ("Ignored for subagent_type 'fork' — forks always inherit the parent model"), but fork is not present in the available-agents list and calling it fails with "agent type 'fork' not found". The doc implies fork is a usable subagent_type. Either list it as a real option or drop/clarify the reference so it isn't mistaken for a way to continue/inherit an existing agent. The actual continue-an-agent path is SendMessage by ID.

Environment Info

• Platform: darwin
• Terminal: Apple_Terminal
• Version: 2.1.179
• Feedback ID: 0f5e0c31-71e3-4d2c-b4a1-d0aeea38e36e

Errors

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