diff --git a/pkg/agentic/alias_test.go b/pkg/agentic/alias_test.go
index c094bad..f8dc56b 100644
--- a/pkg/agentic/alias_test.go
+++ b/pkg/agentic/alias_test.go
@@ -29,3 +29,16 @@ func TestAlias_AgentSession_Good(t *testing.T) {
 		t.Fatalf("expected AgentSession alias to behave like Session")
 	}
 }
+
+func TestAlias_AgentPhase_Good(t *testing.T) {
+	var phase AgentPhase
+	phase.Number = 1
+	phase.Name = "Setup"
+
+	if phase.Number != 1 {
+		t.Fatalf("expected AgentPhase alias to behave like Phase")
+	}
+	if phase.Name != "Setup" {
+		t.Fatalf("expected AgentPhase alias to behave like Phase")
+	}
+}
diff --git a/pkg/agentic/phase.go b/pkg/agentic/phase.go
index c762c4b..fcf7f44 100644
--- a/pkg/agentic/phase.go
+++ b/pkg/agentic/phase.go
@@ -38,6 +38,9 @@ type PhaseOutput struct {
 	Phase   Phase `json:"phase"`
 }
 
+// AgentPhase is the RFC-named alias for Phase.
+type AgentPhase = Phase
+
 // result := c.Action("phase.get").Run(ctx, core.NewOptions(core.Option{Key: "plan_slug", Value: "my-plan-abc123"}))
 func (s *PrepSubsystem) handlePhaseGet(ctx context.Context, options core.Options) core.Result {
 	_, output, err := s.phaseGet(ctx, nil, PhaseGetInput{