diff --git a/internal/build/new_golden_test.go b/internal/build/new_golden_test.go
new file mode 100644
index 0000000..cf7fda9
--- /dev/null
+++ b/internal/build/new_golden_test.go
@@ -0,0 +1,152 @@
+package build
+
+import (
+	"bytes"
+	"encoding/base64"
+	"flag"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+var update = flag.Bool("update", false, "rewrite golden files")
+
+// goldenAppKey is the base64 of the bytes 0x00..0x1f: a fixed, non-secret
+// key that keeps .env byte-stable in the goldens.
+var goldenAppKey = func() string {
+	raw := make([]byte, 32)
+	for i := range raw {
+		raw[i] = byte(i)
+	}
+	return base64.StdEncoding.EncodeToString(raw)
+}()
+
+// newGoldenApp runs NewApp for "demo" in a temp parent whose sibling
+// summercms is a symlink to this repository, so auto-detection yields the
+// relative replace ../summercms. It returns the app dir and the output with
+// the parent path replaced by <parent>.
+func newGoldenApp(t *testing.T, noPlugin bool) (string, []byte) {
+	t.Helper()
+	repo, err := filepath.Abs(filepath.Join("..", ".."))
+	if err != nil {
+		t.Fatal(err)
+	}
+	parent := t.TempDir()
+	if err := os.Symlink(repo, filepath.Join(parent, "summercms")); err != nil {
+		t.Fatal(err)
+	}
+	var out bytes.Buffer
+	dir, err := NewApp(t.Context(), NewOptions{
+		Name:     "demo",
+		Parent:   parent,
+		AppKey:   goldenAppKey,
+		NoGit:    true,
+		NoPlugin: noPlugin,
+	}, &out)
+	if err != nil {
+		t.Fatalf("NewApp: %v\n%s", err, out.String())
+	}
+	return dir, bytes.ReplaceAll(out.Bytes(), []byte(parent), []byte("<parent>"))
+}
+
+// goldenName maps an app-relative path to its golden file name: "/" becomes
+// "__" and a leading "." becomes "dot-", which keeps .env goldens clear of
+// the framework's .env ignore rules.
+func goldenName(rel string) string {
+	name := strings.ReplaceAll(rel, "/", "__")
+	if strings.HasPrefix(name, ".") {
+		name = "dot-" + name[1:]
+	}
+	return name + ".golden"
+}
+
+// assertGolden compares got with testdata/<dir>/<name>, rewriting the file
+// first when -update is set.
+func assertGolden(t *testing.T, dir, rel string, got []byte) {
+	t.Helper()
+	path := filepath.Join("testdata", dir, goldenName(rel))
+	if *update {
+		if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
+			t.Fatal(err)
+		}
+		if err := os.WriteFile(path, got, 0o644); err != nil {
+			t.Fatal(err)
+		}
+	}
+	want, err := os.ReadFile(path)
+	if err != nil {
+		t.Fatalf("%s: %v (run go test -run %s -update to create it)", rel, err, t.Name())
+	}
+	if !bytes.Equal(got, want) {
+		t.Errorf("%s differs from %s\n%s", rel, path, firstDiff(want, got))
+	}
+}
+
+// firstDiff prints the first differing lines of want and got with a little
+// context, in a unified-diff-like form.
+func firstDiff(want, got []byte) string {
+	wl := strings.Split(string(want), "\n")
+	gl := strings.Split(string(got), "\n")
+	i := 0
+	for i < len(wl) && i < len(gl) && wl[i] == gl[i] {
+		i++
+	}
+	var b strings.Builder
+	start := max(i-2, 0)
+	for j := start; j < i; j++ {
+		b.WriteString("  " + wl[j] + "\n")
+	}
+	for j := i; j < len(wl) && j < i+3; j++ {
+		b.WriteString("- " + wl[j] + "\n")
+	}
+	for j := i; j < len(gl) && j < i+3; j++ {
+		b.WriteString("+ " + gl[j] + "\n")
+	}
+	return b.String()
+}
+
+func readAppFile(t *testing.T, dir, rel string) []byte {
+	t.Helper()
+	data, err := os.ReadFile(filepath.Join(dir, filepath.FromSlash(rel)))
+	if err != nil {
+		t.Fatal(err)
+	}
+	return data
+}
+
+// TestNewGolden pins every file summer new writes for the default app.
+// AGENTS.md (a symlink) and the starter plugin's go.mod/go.sum (dependency
+// versions drift) are asserted instead of pinned.
+func TestNewGolden(t *testing.T) {
+	dir, out := newGoldenApp(t, false)
+	for _, rel := range []string{
+		"go.mod", "go.work", "summer.yaml", "main.go", "plugins.gen.go",
+		"config/app.yaml", "config/database.yaml", "config/http.yaml", "config/storage.yaml",
+		".env", ".env.example", ".gitignore", "compose.yaml", "CLAUDE.md",
+		"plugins/demo/plugin.go", "plugins/demo/routes.go",
+	} {
+		assertGolden(t, "new", rel, readAppFile(t, dir, rel))
+	}
+	assertGolden(t, "new", "next-steps.txt", out)
+
+	pluginMod := readAppFile(t, dir, "plugins/demo/go.mod")
+	if !bytes.Contains(pluginMod, []byte("replace git.golem15.com/golem15/summercms => ../../../summercms")) {
+		t.Errorf("plugins/demo/go.mod lacks the relative framework replace:\n%s", pluginMod)
+	}
+	if _, err := os.Stat(filepath.Join(dir, "go.sum")); !os.IsNotExist(err) {
+		t.Errorf("app root go.sum exists or stat failed: %v", err)
+	}
+}
+
+// TestNewGoldenNoPlugin pins the files that differ for summer new --no-plugin.
+func TestNewGoldenNoPlugin(t *testing.T) {
+	dir, out := newGoldenApp(t, true)
+	for _, rel := range []string{"go.mod", "go.work", "summer.yaml", "plugins.gen.go", "CLAUDE.md"} {
+		assertGolden(t, "new-no-plugin", rel, readAppFile(t, dir, rel))
+	}
+	assertGolden(t, "new-no-plugin", "next-steps.txt", out)
+	if _, err := os.Stat(filepath.Join(dir, "plugins")); !os.IsNotExist(err) {
+		t.Errorf("--no-plugin created plugins/ or stat failed: %v", err)
+	}
+}
diff --git a/internal/build/testdata/new-no-plugin/CLAUDE.md.golden b/internal/build/testdata/new-no-plugin/CLAUDE.md.golden
new file mode 100644
index 0000000..1787850
--- /dev/null
+++ b/internal/build/testdata/new-no-plugin/CLAUDE.md.golden
@@ -0,0 +1,44 @@
+# CLAUDE.md
+
+Guidance for AI coding agents working in this repository. `AGENTS.md` is a symlink to this file.
+
+## What this is
+
+`sm-demo-app` is a SummerCMS application: a Go program built on the SummerCMS framework, module `git.golem15.com/golem15/summercms`. `go.mod` replaces the framework with the local checkout at `../summercms`. That checkout is shared with every other application next to it: do not edit the framework from here. Change this application, or report the framework problem.
+
+Framework documentation for agents:
+
+- https://summercms.io/docs/llms.txt (index)
+- https://summercms.io/docs/llms-full.txt (full text in one file)
+
+## Commands
+
+Run them from this directory.
+
+```sh
+docker compose up -d --wait        # start PostgreSQL 16 on 127.0.0.1:54320
+summer build                       # generate main.go and plugins.gen.go, build bin/demo
+summer dev                         # watch sources and rebuild
+summer migrate                     # run plugin migrations
+summer serve                       # start the HTTP server
+summer make:plugin golem15.<name>  # scaffold a plugin module under plugins/<name>
+summer plugin:add plugins/<name>   # register it in summer.yaml, go.mod and go.work
+```
+
+## Layout
+
+- `summer.yaml`: the application manifest (module path, binary name, ordered plugin list).
+- `plugins/`: local plugin modules.
+- `config/`: YAML configuration (`app.yaml`, `database.yaml`, `http.yaml`, `storage.yaml`). Any key can be overridden with a `SUMMER_` environment variable, a double underscore separating path segments (`SUMMER_DATABASE__DSN` sets `database.dsn`).
+- `.env`: local secrets (database DSN, application key). Never commit it; `.gitignore` excludes it. `.env.example` lists the variables.
+- `compose.yaml`: the local PostgreSQL 16.
+- `main.go`, `plugins.gen.go`: generated by `summer build` from `summer.yaml`. Do not edit them by hand; they are committed.
+- `go.work`: the workspace that joins the application and its plugin modules.
+
+Plugins are Go modules compiled into the binary at build time; there is no runtime plugin loading. Add a plugin with `summer make:plugin` and `summer plugin:add`, then run `summer build`.
+
+## Naming convention
+
+- `sm-<name>-app`: an application, like this repository.
+- `sm-<name>-plugin`: a standalone plugin module.
+- `sm-<name>-theme`: a Nuxt/Vue frontend.
diff --git a/internal/build/testdata/new-no-plugin/go.mod.golden b/internal/build/testdata/new-no-plugin/go.mod.golden
new file mode 100644
index 0000000..53bbae9
--- /dev/null
+++ b/internal/build/testdata/new-no-plugin/go.mod.golden
@@ -0,0 +1,9 @@
+module git.golem15.com/golem15/sm-demo-app
+
+go 1.27.0
+
+toolchain go1.27.0
+
+require git.golem15.com/golem15/summercms v0.0.0
+
+replace git.golem15.com/golem15/summercms => ../summercms
diff --git a/internal/build/testdata/new-no-plugin/go.work.golden b/internal/build/testdata/new-no-plugin/go.work.golden
new file mode 100644
index 0000000..f748088
--- /dev/null
+++ b/internal/build/testdata/new-no-plugin/go.work.golden
@@ -0,0 +1,7 @@
+go 1.27.0
+
+toolchain go1.27.0
+
+use (
+	.
+)
diff --git a/internal/build/testdata/new-no-plugin/next-steps.txt.golden b/internal/build/testdata/new-no-plugin/next-steps.txt.golden
new file mode 100644
index 0000000..e0f56b0
--- /dev/null
+++ b/internal/build/testdata/new-no-plugin/next-steps.txt.golden
@@ -0,0 +1,10 @@
+created <parent>/sm-demo-app
+
+Next steps, inside sm-demo-app:
+  docker compose up -d --wait
+  summer build
+  summer migrate
+  summer serve
+
+The app has no plugins yet. Add one with summer make:plugin golem15.<name>
+and summer plugin:add plugins/<name>, then run summer build again.
diff --git a/internal/build/testdata/new-no-plugin/plugins.gen.go.golden b/internal/build/testdata/new-no-plugin/plugins.gen.go.golden
new file mode 100644
index 0000000..e4fafd9
--- /dev/null
+++ b/internal/build/testdata/new-no-plugin/plugins.gen.go.golden
@@ -0,0 +1,6 @@
+// Code generated by summer build. DO NOT EDIT.
+
+package main
+
+// PluginIDs is the ordered plugin list from summer.yaml.
+var PluginIDs = []string{}
diff --git a/internal/build/testdata/new-no-plugin/summer.yaml.golden b/internal/build/testdata/new-no-plugin/summer.yaml.golden
new file mode 100644
index 0000000..1c57d49
--- /dev/null
+++ b/internal/build/testdata/new-no-plugin/summer.yaml.golden
@@ -0,0 +1,3 @@
+module: git.golem15.com/golem15/sm-demo-app
+binary: demo
+plugins:
diff --git a/internal/build/testdata/new/CLAUDE.md.golden b/internal/build/testdata/new/CLAUDE.md.golden
new file mode 100644
index 0000000..cdf0295
--- /dev/null
+++ b/internal/build/testdata/new/CLAUDE.md.golden
@@ -0,0 +1,44 @@
+# CLAUDE.md
+
+Guidance for AI coding agents working in this repository. `AGENTS.md` is a symlink to this file.
+
+## What this is
+
+`sm-demo-app` is a SummerCMS application: a Go program built on the SummerCMS framework, module `git.golem15.com/golem15/summercms`. `go.mod` replaces the framework with the local checkout at `../summercms`. That checkout is shared with every other application next to it: do not edit the framework from here. Change this application, or report the framework problem.
+
+Framework documentation for agents:
+
+- https://summercms.io/docs/llms.txt (index)
+- https://summercms.io/docs/llms-full.txt (full text in one file)
+
+## Commands
+
+Run them from this directory.
+
+```sh
+docker compose up -d --wait        # start PostgreSQL 16 on 127.0.0.1:54320
+summer build                       # generate main.go and plugins.gen.go, build bin/demo
+summer dev                         # watch sources and rebuild
+summer migrate                     # run plugin migrations
+summer serve                       # start the HTTP server
+summer make:plugin golem15.<name>  # scaffold a plugin module under plugins/<name>
+summer plugin:add plugins/<name>   # register it in summer.yaml, go.mod and go.work
+```
+
+## Layout
+
+- `summer.yaml`: the application manifest (module path, binary name, ordered plugin list).
+- `plugins/`: local plugin modules. `plugins/demo` is the starter plugin `golem15.demo`; its `routes.go` answers `GET /` with JSON.
+- `config/`: YAML configuration (`app.yaml`, `database.yaml`, `http.yaml`, `storage.yaml`). Any key can be overridden with a `SUMMER_` environment variable, a double underscore separating path segments (`SUMMER_DATABASE__DSN` sets `database.dsn`).
+- `.env`: local secrets (database DSN, application key). Never commit it; `.gitignore` excludes it. `.env.example` lists the variables.
+- `compose.yaml`: the local PostgreSQL 16.
+- `main.go`, `plugins.gen.go`: generated by `summer build` from `summer.yaml`. Do not edit them by hand; they are committed.
+- `go.work`: the workspace that joins the application and its plugin modules.
+
+Plugins are Go modules compiled into the binary at build time; there is no runtime plugin loading. Add a plugin with `summer make:plugin` and `summer plugin:add`, then run `summer build`.
+
+## Naming convention
+
+- `sm-<name>-app`: an application, like this repository.
+- `sm-<name>-plugin`: a standalone plugin module.
+- `sm-<name>-theme`: a Nuxt/Vue frontend.
diff --git a/internal/build/testdata/new/compose.yaml.golden b/internal/build/testdata/new/compose.yaml.golden
new file mode 100644
index 0000000..c635ef9
--- /dev/null
+++ b/internal/build/testdata/new/compose.yaml.golden
@@ -0,0 +1,22 @@
+# Local development database: docker compose up -d --wait
+# PostgreSQL is published on the loopback address only, and the credentials
+# match SUMMER_DATABASE__DSN in .env.
+services:
+  postgres:
+    image: postgres:16
+    environment:
+      POSTGRES_USER: summer
+      POSTGRES_PASSWORD: summer
+      POSTGRES_DB: demo
+    ports:
+      - "127.0.0.1:54320:5432"
+    volumes:
+      - pgdata:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U summer -d demo"]
+      interval: 2s
+      timeout: 3s
+      retries: 30
+
+volumes:
+  pgdata:
diff --git a/internal/build/testdata/new/config__app.yaml.golden b/internal/build/testdata/new/config__app.yaml.golden
new file mode 100644
index 0000000..cff5741
--- /dev/null
+++ b/internal/build/testdata/new/config__app.yaml.golden
@@ -0,0 +1,5 @@
+name: demo
+debug: false
+# The application key encrypts data at rest. Set SUMMER_APP__KEY in .env (a
+# 32-byte base64 value); keep it out of this file and out of git.
+key: ""
diff --git a/internal/build/testdata/new/config__database.yaml.golden b/internal/build/testdata/new/config__database.yaml.golden
new file mode 100644
index 0000000..fbec289
--- /dev/null
+++ b/internal/build/testdata/new/config__database.yaml.golden
@@ -0,0 +1,2 @@
+# Set SUMMER_DATABASE__DSN in .env; compose.yaml runs the matching PostgreSQL.
+dsn: ""
diff --git a/internal/build/testdata/new/config__http.yaml.golden b/internal/build/testdata/new/config__http.yaml.golden
new file mode 100644
index 0000000..e15d567
--- /dev/null
+++ b/internal/build/testdata/new/config__http.yaml.golden
@@ -0,0 +1,5 @@
+body_limits:
+  # Request body limits in bytes. Keep them YAML numbers: values from the
+  # environment are strings and are rejected at boot.
+  default_bytes: 1048576
+  upload_bytes: 10485760
diff --git a/internal/build/testdata/new/config__storage.yaml.golden b/internal/build/testdata/new/config__storage.yaml.golden
new file mode 100644
index 0000000..17a6c4d
--- /dev/null
+++ b/internal/build/testdata/new/config__storage.yaml.golden
@@ -0,0 +1,5 @@
+# Uploads bucket, required by summer serve. A file:// URL is a local
+# directory under the application working directory.
+uploads:
+  bucket_url: "file://./storage/app/uploads"
+  public_path_prefix: "/storage/uploads"
diff --git a/internal/build/testdata/new/dot-env.example.golden b/internal/build/testdata/new/dot-env.example.golden
new file mode 100644
index 0000000..c731889
--- /dev/null
+++ b/internal/build/testdata/new/dot-env.example.golden
@@ -0,0 +1,10 @@
+# The variables .env sets. summer new wrote a .env with a fresh key; copy this
+# file to .env only when you need to start over.
+SUMMER_DATABASE__DSN=postgres://summer:summer@127.0.0.1:54320/demo?sslmode=disable
+# A 32-byte base64 application key. Generate one with ./bin/demo key:generate
+# and paste only the key, without the leading check mark.
+SUMMER_APP__KEY=
+# Uploads bucket; config/storage.yaml already sets this default.
+# SUMMER_STORAGE__UPLOADS__BUCKET_URL=file://./storage/app/uploads
+# Configuration environment; selects the config overlay (default production).
+# SUMMER_ENV=development
diff --git a/internal/build/testdata/new/dot-env.golden b/internal/build/testdata/new/dot-env.golden
new file mode 100644
index 0000000..698bce0
--- /dev/null
+++ b/internal/build/testdata/new/dot-env.golden
@@ -0,0 +1,5 @@
+# Local secrets for this application: the database DSN and the application
+# key. .gitignore excludes this file; never commit it. Real environment
+# variables override the values here.
+SUMMER_DATABASE__DSN=postgres://summer:summer@127.0.0.1:54320/demo?sslmode=disable
+SUMMER_APP__KEY=AAECAwQFBgcICQoLDA0ODxAREhMUFRYXGBkaGxwdHh8=
diff --git a/internal/build/testdata/new/dot-gitignore.golden b/internal/build/testdata/new/dot-gitignore.golden
new file mode 100644
index 0000000..384a504
--- /dev/null
+++ b/internal/build/testdata/new/dot-gitignore.golden
@@ -0,0 +1,6 @@
+/bin/
+/tmp/
+/storage/
+.env
+go.work.sum
+*.exe
diff --git a/internal/build/testdata/new/go.mod.golden b/internal/build/testdata/new/go.mod.golden
new file mode 100644
index 0000000..1b01942
--- /dev/null
+++ b/internal/build/testdata/new/go.mod.golden
@@ -0,0 +1,14 @@
+module git.golem15.com/golem15/sm-demo-app
+
+go 1.27.0
+
+toolchain go1.27.0
+
+require (
+	git.golem15.com/golem15/sm-demo-app/plugins/demo v0.0.0
+	git.golem15.com/golem15/summercms v0.0.0
+)
+
+replace git.golem15.com/golem15/summercms => ../summercms
+
+replace git.golem15.com/golem15/sm-demo-app/plugins/demo => ./plugins/demo
diff --git a/internal/build/testdata/new/go.work.golden b/internal/build/testdata/new/go.work.golden
new file mode 100644
index 0000000..937d47f
--- /dev/null
+++ b/internal/build/testdata/new/go.work.golden
@@ -0,0 +1,8 @@
+go 1.27.0
+
+toolchain go1.27.0
+
+use (
+	.
+	./plugins/demo
+)
diff --git a/internal/build/testdata/new/main.go.golden b/internal/build/testdata/new/main.go.golden
new file mode 100644
index 0000000..2dfcd67
--- /dev/null
+++ b/internal/build/testdata/new/main.go.golden
@@ -0,0 +1,59 @@
+// Code generated by summer build. DO NOT EDIT.
+
+package main
+
+import (
+	"fmt"
+	"io"
+	"os"
+
+	"git.golem15.com/golem15/summercms/modules/backpack"
+	"git.golem15.com/golem15/summercms/modules/bonfire"
+	"git.golem15.com/golem15/summercms/modules/cabana"
+	"git.golem15.com/golem15/summercms/modules/compass"
+	"git.golem15.com/golem15/summercms/modules/conga"
+	"git.golem15.com/golem15/summercms/modules/lagoon"
+	"git.golem15.com/golem15/summercms/modules/pact"
+	"git.golem15.com/golem15/summercms/modules/party"
+	"git.golem15.com/golem15/summercms/modules/sunscreen"
+	"git.golem15.com/golem15/summercms/modules/surf"
+)
+
+func main() {
+	if err := run(os.Args[1:], os.Stdout); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+}
+
+func run(args []string, out io.Writer) error {
+	sunscreen.InstallDefault(os.Stderr)
+	cfg, err := compass.Load("config")
+	if err != nil {
+		return err
+	}
+	app := backpack.New(cfg)
+	plugins, err := party.Activate(app, PluginIDs)
+	if err != nil {
+		return err
+	}
+	commands := lagoon.RuntimeCommands(app, plugins)
+	commands = append(commands, conga.RuntimeCommands(app, plugins)...)
+	commands = append(commands, surf.ServeCommand(app, plugins))
+	commands = append(commands, surf.RouteListCommand(app, plugins))
+	commands = append(commands, cabana.RuntimeCommands(app)...)
+	for _, plugin := range plugins {
+		if hasCommands, ok := plugin.(pact.HasCommands); ok {
+			commands = append(commands, hasCommands.Commands()...)
+		}
+	}
+	if err := app.Publish(bonfire.NewCatalog(commands)); err != nil {
+		return err
+	}
+	root, err := bonfire.NewRoot("demo", commands, out)
+	if err != nil {
+		return err
+	}
+	root.SetArgs(args)
+	return root.Execute()
+}
diff --git a/internal/build/testdata/new/next-steps.txt.golden b/internal/build/testdata/new/next-steps.txt.golden
new file mode 100644
index 0000000..6aebac5
--- /dev/null
+++ b/internal/build/testdata/new/next-steps.txt.golden
@@ -0,0 +1,10 @@
+created <parent>/sm-demo-app
+
+Next steps, inside sm-demo-app:
+  docker compose up -d --wait
+  summer build
+  summer migrate
+  summer serve
+
+Then, from another terminal:
+  curl http://127.0.0.1:8080/
diff --git a/internal/build/testdata/new/plugins.gen.go.golden b/internal/build/testdata/new/plugins.gen.go.golden
new file mode 100644
index 0000000..2dc017e
--- /dev/null
+++ b/internal/build/testdata/new/plugins.gen.go.golden
@@ -0,0 +1,12 @@
+// Code generated by summer build. DO NOT EDIT.
+
+package main
+
+import (
+	_ "git.golem15.com/golem15/sm-demo-app/plugins/demo"
+)
+
+// PluginIDs is the ordered plugin list from summer.yaml.
+var PluginIDs = []string{
+	"golem15.demo",
+}
diff --git a/internal/build/testdata/new/plugins__demo__plugin.go.golden b/internal/build/testdata/new/plugins__demo__plugin.go.golden
new file mode 100644
index 0000000..fb0f51a
--- /dev/null
+++ b/internal/build/testdata/new/plugins__demo__plugin.go.golden
@@ -0,0 +1,60 @@
+package demo
+
+import (
+	"embed"
+	"io/fs"
+
+	"git.golem15.com/golem15/summercms/modules/backpack"
+	"git.golem15.com/golem15/summercms/modules/bonfire"
+	"git.golem15.com/golem15/summercms/modules/pact"
+	"git.golem15.com/golem15/summercms/modules/party"
+	"github.com/go-gormigrate/gormigrate/v2"
+)
+
+var (
+	_ pact.HasConfig           = (*Plugin)(nil)
+	_ pact.HasLang             = (*Plugin)(nil)
+	_ pact.HasMailTemplates    = (*Plugin)(nil)
+	_ pact.HasModels           = (*Plugin)(nil)
+	_ pact.HasMigrations       = (*Plugin)(nil)
+	_ pact.HasCommands         = (*Plugin)(nil)
+	_ pact.HasJobs             = (*Plugin)(nil)
+	_ pact.HasAdminControllers = (*Plugin)(nil)
+)
+
+//go:embed config
+var configFS embed.FS
+
+//go:embed lang
+var langFS embed.FS
+
+//go:embed views/mail
+var mailFS embed.FS
+
+// Plugin is the golem15.demo plugin.
+type Plugin struct{}
+
+func (p *Plugin) ID() string         { return "golem15.demo" }
+func (p *Plugin) Requires() []string { return nil }
+
+func (p *Plugin) Register(*backpack.App) error { return nil }
+func (p *Plugin) Boot(*backpack.App) error     { return nil }
+
+func (p *Plugin) ConfigFS() fs.FS { return configFS }
+func (p *Plugin) LangFS() fs.FS   { return langFS }
+
+func (p *Plugin) MailTemplatesFS() fs.FS         { return mailFS }
+func (p *Plugin) MailTemplates() []string        { return nil }
+func (p *Plugin) MailLayouts() map[string]string { return nil }
+
+func (p *Plugin) Models() []any                       { return generatedModels() }
+func (p *Plugin) Migrations() []*gormigrate.Migration { return generatedMigrations() }
+func (p *Plugin) Commands() []bonfire.Command         { return generatedCommands() }
+func (p *Plugin) Jobs() []pact.Job                    { return generatedJobs() }
+func (p *Plugin) AdminControllers() []pact.AdminController {
+	return generatedAdminControllers()
+}
+
+func init() {
+	party.Register(&Plugin{})
+}
diff --git a/internal/build/testdata/new/plugins__demo__routes.go.golden b/internal/build/testdata/new/plugins__demo__routes.go.golden
new file mode 100644
index 0000000..ca8dd04
--- /dev/null
+++ b/internal/build/testdata/new/plugins__demo__routes.go.golden
@@ -0,0 +1,23 @@
+package demo
+
+import (
+	"encoding/json"
+	"net/http"
+
+	"git.golem15.com/golem15/summercms/modules/pact"
+)
+
+var _ pact.HasRoutes = (*Plugin)(nil)
+
+// Routes registers the starter route: GET / answers with a JSON greeting
+// naming this plugin.
+func (p *Plugin) Routes(r pact.Router) error {
+	r.Get("/{$}", func(w http.ResponseWriter, req *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		_ = json.NewEncoder(w).Encode(map[string]string{
+			"message": "Hello from SummerCMS",
+			"plugin":  p.ID(),
+		})
+	})
+	return nil
+}
diff --git a/internal/build/testdata/new/summer.yaml.golden b/internal/build/testdata/new/summer.yaml.golden
new file mode 100644
index 0000000..03979a2
--- /dev/null
+++ b/internal/build/testdata/new/summer.yaml.golden
@@ -0,0 +1,5 @@
+module: git.golem15.com/golem15/sm-demo-app
+binary: demo
+plugins:
+  - id: golem15.demo
+    module: git.golem15.com/golem15/sm-demo-app/plugins/demo