diff --git a/src/Loom.Templates/templates/loom-api/.template.config/template.json b/src/Loom.Templates/templates/loom-api/.template.config/template.json
index 225b04e..309f1dd 100644
--- a/src/Loom.Templates/templates/loom-api/.template.config/template.json
+++ b/src/Loom.Templates/templates/loom-api/.template.config/template.json
@@ -15,10 +15,29 @@
     "language": "C#",
     "type": "solution"
   },
-  "sourceName": "MyApp",
   "preferNameDirectory": true,
   "defaultName": "MyApp",
   "symbols": {
+    "safeName": {
+      "type": "generated",
+      "generator": "regex",
+      "dataType": "string",
+      "replaces": "MyApp",
+      "fileRename": "MyApp",
+      "parameters": {
+        "source": "name",
+        "steps": [
+          {
+            "regex": "[^A-Za-z0-9_.]",
+            "replacement": "_"
+          },
+          {
+            "regex": "(^|\\.)([0-9])",
+            "replacement": "$1_$2"
+          }
+        ]
+      }
+    },
     "userSecretsId": {
       "type": "generated",
       "generator": "guid",
@@ -38,6 +57,10 @@
           {
             "regex": "[^A-Za-z0-9_]",
             "replacement": "_"
+          },
+          {
+            "regex": "^([0-9])",
+            "replacement": "_$1"
           }
         ]
       }
diff --git a/src/Loom.Templates/templates/loom-api/src/MyApp.Api/Features/Widgets/WidgetConfiguration.cs b/src/Loom.Templates/templates/loom-api/src/MyApp.Api/Features/Widgets/WidgetConfiguration.cs
index 9edbdb5..66fa536 100644
--- a/src/Loom.Templates/templates/loom-api/src/MyApp.Api/Features/Widgets/WidgetConfiguration.cs
+++ b/src/Loom.Templates/templates/loom-api/src/MyApp.Api/Features/Widgets/WidgetConfiguration.cs
@@ -14,7 +14,7 @@ namespace MyApp.Api.Features.Widgets;
 /// </remarks>
 internal sealed class WidgetConfiguration : IEntityTypeConfiguration<Widget>
 {
-    public void Configure(EntityTypeBuilder<Widget> builder)
+    void IEntityTypeConfiguration<Widget>.Configure(EntityTypeBuilder<Widget> builder)
     {
         ArgumentNullException.ThrowIfNull(builder);
 
diff --git a/src/Loom.Templates/templates/loom-api/src/MyApp.Api/Infrastructure/AppDbContext.cs b/src/Loom.Templates/templates/loom-api/src/MyApp.Api/Infrastructure/AppDbContext.cs
index cb26654..f35f8cd 100644
--- a/src/Loom.Templates/templates/loom-api/src/MyApp.Api/Infrastructure/AppDbContext.cs
+++ b/src/Loom.Templates/templates/loom-api/src/MyApp.Api/Infrastructure/AppDbContext.cs
@@ -9,6 +9,7 @@ namespace MyApp.Api.Infrastructure;
 /// </summary>
 public sealed class AppDbContext(DbContextOptions<AppDbContext> options) : DbContext(options)
 {
+    /// <summary>Gets the widgets. Only aggregate roots get a set of their own.</summary>
     public DbSet<Widget> Widgets => Set<Widget>();
 
     // Conventions, not model creation. Property discovery skips types it does not recognise, so an
diff --git a/src/Loom.Templates/templates/loom-api/src/MyApp.Api/Infrastructure/DesignTimeDbContextFactory.cs b/src/Loom.Templates/templates/loom-api/src/MyApp.Api/Infrastructure/DesignTimeDbContextFactory.cs
index 8dd2981..996fbb7 100644
--- a/src/Loom.Templates/templates/loom-api/src/MyApp.Api/Infrastructure/DesignTimeDbContextFactory.cs
+++ b/src/Loom.Templates/templates/loom-api/src/MyApp.Api/Infrastructure/DesignTimeDbContextFactory.cs
@@ -12,7 +12,7 @@ namespace MyApp.Api.Infrastructure;
 /// </remarks>
 internal sealed class DesignTimeDbContextFactory : IDesignTimeDbContextFactory<AppDbContext>
 {
-    public AppDbContext CreateDbContext(string[] args)
+    AppDbContext IDesignTimeDbContextFactory<AppDbContext>.CreateDbContext(string[] args)
     {
         DbContextOptionsBuilder<AppDbContext> builder = new();
         builder.UseNpgsql("Host=design-time;Database=designtime;Username=none;Password=none");
diff --git a/src/Loom.Templates/templates/loom-worker/.template.config/template.json b/src/Loom.Templates/templates/loom-worker/.template.config/template.json
index b9db89b..d2e2550 100644
--- a/src/Loom.Templates/templates/loom-worker/.template.config/template.json
+++ b/src/Loom.Templates/templates/loom-worker/.template.config/template.json
@@ -15,10 +15,29 @@
     "language": "C#",
     "type": "solution"
   },
-  "sourceName": "MyApp",
   "preferNameDirectory": true,
   "defaultName": "MyApp",
   "symbols": {
+    "safeName": {
+      "type": "generated",
+      "generator": "regex",
+      "dataType": "string",
+      "replaces": "MyApp",
+      "fileRename": "MyApp",
+      "parameters": {
+        "source": "name",
+        "steps": [
+          {
+            "regex": "[^A-Za-z0-9_.]",
+            "replacement": "_"
+          },
+          {
+            "regex": "(^|\\.)([0-9])",
+            "replacement": "$1_$2"
+          }
+        ]
+      }
+    },
     "userSecretsId": {
       "type": "generated",
       "generator": "guid",
@@ -38,6 +57,10 @@
           {
             "regex": "[^A-Za-z0-9_]",
             "replacement": "_"
+          },
+          {
+            "regex": "^([0-9])",
+            "replacement": "_$1"
           }
         ]
       }
diff --git a/src/Loom.Templates/templates/loom-worker/src/MyApp.Worker/Features/Widgets/WidgetConfiguration.cs b/src/Loom.Templates/templates/loom-worker/src/MyApp.Worker/Features/Widgets/WidgetConfiguration.cs
index b0a1129..1633b28 100644
--- a/src/Loom.Templates/templates/loom-worker/src/MyApp.Worker/Features/Widgets/WidgetConfiguration.cs
+++ b/src/Loom.Templates/templates/loom-worker/src/MyApp.Worker/Features/Widgets/WidgetConfiguration.cs
@@ -13,7 +13,7 @@ namespace MyApp.Worker.Features.Widgets;
 /// </remarks>
 internal sealed class WidgetConfiguration : IEntityTypeConfiguration<Widget>
 {
-    public void Configure(EntityTypeBuilder<Widget> builder)
+    void IEntityTypeConfiguration<Widget>.Configure(EntityTypeBuilder<Widget> builder)
     {
         ArgumentNullException.ThrowIfNull(builder);
 
diff --git a/src/Loom.Templates/templates/loom-worker/src/MyApp.Worker/Infrastructure/AppDbContext.cs b/src/Loom.Templates/templates/loom-worker/src/MyApp.Worker/Infrastructure/AppDbContext.cs
index fa26804..69be7ed 100644
--- a/src/Loom.Templates/templates/loom-worker/src/MyApp.Worker/Infrastructure/AppDbContext.cs
+++ b/src/Loom.Templates/templates/loom-worker/src/MyApp.Worker/Infrastructure/AppDbContext.cs
@@ -9,6 +9,7 @@ namespace MyApp.Worker.Infrastructure;
 /// </summary>
 public sealed class AppDbContext(DbContextOptions<AppDbContext> options) : DbContext(options)
 {
+    /// <summary>Gets the widgets. Only aggregate roots get a set of their own.</summary>
     public DbSet<Widget> Widgets => Set<Widget>();
 
     // Conventions, not model creation. Property discovery skips types it does not recognise, so an
diff --git a/src/Loom.Templates/templates/loom-worker/src/MyApp.Worker/Infrastructure/DesignTimeDbContextFactory.cs b/src/Loom.Templates/templates/loom-worker/src/MyApp.Worker/Infrastructure/DesignTimeDbContextFactory.cs
index e3071d2..4cf4a78 100644
--- a/src/Loom.Templates/templates/loom-worker/src/MyApp.Worker/Infrastructure/DesignTimeDbContextFactory.cs
+++ b/src/Loom.Templates/templates/loom-worker/src/MyApp.Worker/Infrastructure/DesignTimeDbContextFactory.cs
@@ -12,7 +12,7 @@ namespace MyApp.Worker.Infrastructure;
 /// </remarks>
 internal sealed class DesignTimeDbContextFactory : IDesignTimeDbContextFactory<AppDbContext>
 {
-    public AppDbContext CreateDbContext(string[] args)
+    AppDbContext IDesignTimeDbContextFactory<AppDbContext>.CreateDbContext(string[] args)
     {
         DbContextOptionsBuilder<AppDbContext> builder = new();
         builder.UseNpgsql("Host=design-time;Database=designtime;Username=none;Password=none");
diff --git a/tests/Loom.Templates.Tests/TemplateManifestTests.cs b/tests/Loom.Templates.Tests/TemplateManifestTests.cs
index bcd5a3e..bb4157d 100644
--- a/tests/Loom.Templates.Tests/TemplateManifestTests.cs
+++ b/tests/Loom.Templates.Tests/TemplateManifestTests.cs
@@ -33,7 +33,7 @@ public async Task The_Manifest_Is_Valid_Json_With_The_Members_Dotnet_New_Require
     {
         JsonElement manifest = await ReadManifestAsync(template);
 
-        foreach (string member in (string[])["identity", "name", "shortName", "sourceName"])
+        foreach (string member in (string[])["identity", "name", "shortName"])
         {
             await Assert.That(manifest.TryGetProperty(member, out JsonElement value) &&
                 value.ValueKind is JsonValueKind.String &&
@@ -53,12 +53,22 @@ public async Task The_Short_Name_Matches_The_Directory(string template)
 
     [Test]
     [MethodDataSource(nameof(Templates))]
-    public async Task The_Source_Name_Occurs_In_The_Content_It_Renames(string template)
+    public async Task Exactly_One_Symbol_Renames_Files(string template)
     {
         JsonElement manifest = await ReadManifestAsync(template);
-        string sourceName = manifest.GetProperty("sourceName").GetString()!;
 
-        await Assert.That(await OccurrencesAsync(template, sourceName)).IsGreaterThan(0);
+        string[] renamers =
+        [
+            .. manifest.GetProperty("symbols").EnumerateObject()
+                .Where(symbol => symbol.Value.TryGetProperty("fileRename", out _))
+                .Select(symbol => symbol.Name),
+        ];
+
+        // The token is renamed and replaced by one symbol rather than by sourceName, so that paths and
+        // file contents get the same sanitised value. A name like "My-App" is a valid directory and an
+        // invalid identifier; two mechanisms would disagree about which to write where.
+        await Assert.That(renamers.Length).IsEqualTo(1);
+        await Assert.That(manifest.TryGetProperty("sourceName", out _)).IsFalse();
     }
 
     [Test]