Struct SessionHookClosures 

pub struct SessionHookClosures {
    pub should_stop_after_turn: Arc<dyn Fn(&ShouldStopAfterTurnContext) -> bool + Send + Sync>,
    pub get_steering_messages: Arc<dyn Fn() -> Vec<Message> + Send + Sync>,
    pub get_follow_up_messages: Arc<dyn Fn() -> Vec<Message> + Send + Sync>,
    pub tool_execution: ToolExecutionMode,
}

Closures owned by the cli (or any product) that participate in the agent hook chain. Passed into AgentBuilder::with_session_hooks so they are composed into the same AgentHooks that the middleware pipeline produces. The single-set_hooks invariant (only AgentBuilder::build calls set_hooks) is what keeps the before/after_tool_call slots alive across the cli session boot.

Fields

should_stop_after_turn: Arc<dyn Fn(&ShouldStopAfterTurnContext) -> bool + Send + Sync>

Stop signal consulted at the end of every turn.

get_steering_messages: Arc<dyn Fn() -> Vec<Message> + Send + Sync>

Drain the steering queue on demand.

get_follow_up_messages: Arc<dyn Fn() -> Vec<Message> + Send + Sync>

Drain the follow-up queue on demand.

tool_execution: ToolExecutionMode

Tool-execution mode (Sequential is the cli default).