Make public options opaque

engine_test.go

@@ -1378,6 +1378,45 @@ func TestSourceOptionsRejectInvalidInputs(t *testing.T) {
 	}
 }
 
+func TestPackageOptionsComposeFromSlice(t *testing.T) {
+	fake := &fakeLLMClient{response: &scriptorium.GenerateResponse{Content: "ok"}}
+	options := []scriptorium.Option{
+		nil,
+		scriptorium.WithProfiles(scriptorium.Profile{
+			ID:       "slice-profile",
+			Endpoint: "http://slice/v1",
+			Model:    "slice-model",
+		}),
+		scriptorium.WithLLMClient(fake),
+	}
+
+	engine, err := scriptorium.NewEngine(scriptorium.Config{
+		PromptDir: "./examples/prompts",
+		SchemaDir: "./examples/schemas",
+	}, options...)
+	if err != nil {
+		t.Fatalf("expected package-provided options to compose, got %v", err)
+	}
+
+	_, err = engine.Run(context.Background(), scriptorium.RunRequest{
+		PromptID:  "generic.markdown_summary",
+		ProfileID: "slice-profile",
+		Inputs: map[string]scriptorium.ArtifactRef{
+			"transcript": scriptorium.Inline("Rin opens the gate."),
+			"glossary":   scriptorium.Inline("gate: A guarded passage."),
+		},
+	})
+	if err != nil {
+		t.Fatalf("expected run with composed options to succeed, got %v", err)
+	}
+	if len(fake.requests) != 1 {
+		t.Fatalf("expected one generate request, got %d", len(fake.requests))
+	}
+	if fake.requests[0].Target.Model != "slice-model" {
+		t.Fatalf("expected profile from composed options, got %q", fake.requests[0].Target.Model)
+	}
+}
+
 func TestExtraParamsTypedNestedValuesAreCopiedAcrossPublicBoundary(t *testing.T) {
 	fake := &fakeLLMClient{response: &scriptorium.GenerateResponse{Content: "ok"}}
 	engine := newExampleEngineWithOptions(t, "./examples/schemas", scriptorium.WithLLMClient(fake))