Type Alias PermissionHook 

pub type PermissionHook = Arc<dyn Fn(&str, &Value) -> PermissionDecision + Send + Sync>;

Signature for a permission hook: Fn(&tool_name, &arguments) -> PermissionDecision.

The hook is invoked just before each tool execution. It can:

• Allow the call unchanged,
• Deny it with a reason (fed back as a tool error),
• Transform the arguments before execution.

Hooks must be Send + Sync because the agent loop is Send.

Aliased Type

pub struct PermissionHook { /* private fields */ }