update

Pure agent state machine — the sans-IO update function.

update(state, msg) -> StepResult(msg) is a pure function: no provider calls, no tool execution, no telemetry, no hooks.

The runtime calls this function, interprets the returned effects, and feeds results back as new messages.

Values

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pub fn update(
  st: state.AgentState,
  m: msg.AgentMsg,
) -> step_result.StepResult(msg.AgentMsg)

Pure state transition: given current state and a message, return the next state and any effects the runtime should execute.

This is the entire agent loop logic, sans IO.