Method executeOnAgentSwitchHooks

pkg/runtime/hooks.go:298–310

executeOnAgentSwitchHooks fires on_agent_switch when the runtime changes the active agent. Observational; failures are logged. The hook runs alongside the existing [AgentSwitching] event, so users who already consume that event see no behaviour change. The previous agent's model-endpoint snapshot i

(ctx context.Context, a *agent.Agent, sessionID, fromAgent, toAgent, kind string)

// every agent switch (matches the cheap-when-unused property of the
// other hook callsites).
func (r *LocalRuntime) executeOnAgentSwitchHooks(ctx context.Context, a *agent.Agent, sessionID, fromAgent, toAgent, kind string) {
	exec := r.hooksExec(a)
	if exec == nil || !exec.Has(hooks.EventOnAgentSwitch) {
		return
	}
	r.dispatchHook(ctx, a, hooks.EventOnAgentSwitch, &hooks.Input{
		SessionID:       sessionID,
		FromAgent:       fromAgent,
		ToAgent:         toAgent,
		AgentSwitchKind: kind,
		FromAgentModels: r.fromAgentModels(fromAgent),
	}, nil)
}

// fromAgentModels snapshots the previous agent's configured model
// endpoints into the wire-friendly [hooks.ModelEndpoint] form. Hooks