Enum Event 

pub enum Event<'a> {
    Request(&'a mut Request),
    Signal(&'a Signals),
    Decision {
        request: &'a mut Request,
        decision: &'a dyn Decision,
    },
    ModelResponse(&'a AggLlmResponse),
}

An event observed by the algorithm. Events are consumed by Processor to mutate state.

Request-bearing variants (Event::Request, Event::Decision) borrow the request mutably, so a processor may rewrite it in place and the edit propagates to the rest of the chain and to the model call. The observation-only variants stay immutable.

Variants

Request(&'a mut Request)

The inbound request that begins a turn.

Signal(&'a Signals)

An out-of-band agentic-stack signal (tool results, budget updates, …).

Decision

A routing decision paired with the request that produced it.

The request is rewritable: a processor may add instructions or notes here that are bound to the routing outcome (e.g. a tier-specific system prompt).

Fields

request: &'a mut Request

The request, rewritable in place.

decision: &'a dyn Decision

The routing decision produced for request.

ModelResponse(&'a AggLlmResponse)

A buffered response received back from a model.