diff --git a/infra/config/global/generated/cr-buildbucket.cfg b/infra/config/global/generated/cr-buildbucket.cfg
index 9929bd0c2f..b11c10ed93 100644
--- a/infra/config/global/generated/cr-buildbucket.cfg
+++ b/infra/config/global/generated/cr-buildbucket.cfg
@@ -26,6 +26,10 @@ buckets {
         properties_j: "target_cpu:\"x64\""
       }
       service_account: "tint-ci-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -47,6 +51,10 @@ buckets {
         properties_j: "target_cpu:\"x86\""
       }
       service_account: "tint-ci-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -68,6 +76,10 @@ buckets {
         properties_j: "target_cpu:\"x64\""
       }
       service_account: "tint-ci-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -89,6 +101,10 @@ buckets {
         properties_j: "target_cpu:\"x86\""
       }
       service_account: "tint-ci-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -114,6 +130,10 @@ buckets {
         path: "osx_sdk"
       }
       service_account: "tint-ci-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -139,6 +159,10 @@ buckets {
         path: "osx_sdk"
       }
       service_account: "tint-ci-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -164,6 +188,10 @@ buckets {
         path: "win_toolchain"
       }
       service_account: "tint-ci-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -189,6 +217,10 @@ buckets {
         path: "win_toolchain"
       }
       service_account: "tint-ci-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -214,6 +246,10 @@ buckets {
         path: "win_toolchain"
       }
       service_account: "tint-ci-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -239,6 +275,10 @@ buckets {
         path: "win_toolchain"
       }
       service_account: "tint-ci-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -259,6 +299,10 @@ buckets {
         properties_j: "target_cpu:\"x64\""
       }
       service_account: "tint-ci-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -279,6 +323,10 @@ buckets {
         properties_j: "target_cpu:\"x64\""
       }
       service_account: "tint-ci-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -317,6 +365,10 @@ buckets {
         properties_j: "target_cpu:\"x64\""
       }
       service_account: "tint-try-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -339,6 +391,10 @@ buckets {
         properties_j: "target_cpu:\"x86\""
       }
       service_account: "tint-try-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -361,6 +417,10 @@ buckets {
         properties_j: "target_cpu:\"x64\""
       }
       service_account: "tint-try-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -383,6 +443,10 @@ buckets {
         properties_j: "target_cpu:\"x86\""
       }
       service_account: "tint-try-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -409,6 +473,10 @@ buckets {
         path: "osx_sdk"
       }
       service_account: "tint-try-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -435,6 +503,10 @@ buckets {
         path: "osx_sdk"
       }
       service_account: "tint-try-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -455,6 +527,10 @@ buckets {
         properties_j: "runhooks:true"
       }
       service_account: "tint-try-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -481,6 +557,10 @@ buckets {
         path: "win_toolchain"
       }
       service_account: "tint-try-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -507,6 +587,10 @@ buckets {
         path: "win_toolchain"
       }
       service_account: "tint-try-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -533,6 +617,10 @@ buckets {
         path: "win_toolchain"
       }
       service_account: "tint-try-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -559,6 +647,10 @@ buckets {
         path: "win_toolchain"
       }
       service_account: "tint-try-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -580,6 +672,10 @@ buckets {
         properties_j: "target_cpu:\"x64\""
       }
       service_account: "tint-try-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -601,6 +697,10 @@ buckets {
         properties_j: "target_cpu:\"x64\""
       }
       service_account: "tint-try-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
diff --git a/infra/config/global/generated/project.cfg b/infra/config/global/generated/project.cfg
index 047d6197a8..f3defcdd73 100644
--- a/infra/config/global/generated/project.cfg
+++ b/infra/config/global/generated/project.cfg
@@ -6,3 +6,9 @@
 
 name: "tint"
 access: "group:all"
+lucicfg {
+  version: "1.29.1"
+  package_dir: ".."
+  config_dir: "generated"
+  entry_point: "main.star"
+}
diff --git a/infra/config/global/main.star b/infra/config/global/main.star
index faa43d41c0..263c2786fc 100755
--- a/infra/config/global/main.star
+++ b/infra/config/global/main.star
@@ -10,7 +10,10 @@ main.star: lucicfg configuration for Tint's standalone builers.
 
 # Enable realms experiment.
 lucicfg.enable_experiment("crbug.com/1085650")
-luci.builder.defaults.experiments.set({"luci.use_realms": 100})
+luci.builder.defaults.experiments.set({
+    "luci.use_realms": 100,
+    "luci.recipes.use_python3": 100,
+})
 
 lucicfg.config(fail_on_warnings = True)