`agentDisplayName` is optional in the CLI hook payload (it may be absent for some subagents). The field list currently reads as if it’s always present; update the description to mark it as optional and consider noting what to expect when it isn’t provided.

[jaredleefoster-oss]

agentDisplayName is optional in the CLI hook payload (it may be absent for some subagents). The field list currently reads as if it’s always present; update the description to mark it as optional and consider noting what to expect when it isn’t provided.

* `agentDisplayName` (optional): The human-readable display name of the subagent. This field is omitted for some subagents.

Originally posted by @copilot-pull-request-reviewer in #43876 (comment)

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