diff --git a/uv/src/uv/workspace/plan.py b/uv/src/uv/workspace/plan.py
index 2ab185b..27ed7c1 100644
--- a/uv/src/uv/workspace/plan.py
+++ b/uv/src/uv/workspace/plan.py
@@ -224,7 +224,10 @@ async def create(
             raw_local = parse_local_packages(lock_data)
             # Overlay each target package's SDK (deduped); fall back to the
             # workspace root when no target is a local package.
-            codegen_paths = list(dict.fromkeys(raw_local[p] for p in packages if p in raw_local)) or ["."]
+            if all_packages:
+                codegen_paths = list(dict.fromkeys(raw_local.values())) or ["."]
+            else:
+                codegen_paths = list(dict.fromkeys(raw_local[p] for p in packages if p in raw_local)) or ["."]
             for codegen_path in codegen_paths:
                 ws_dir = await _run_codegen(ws_dir, codegen_path)
             if workspace_path == ".":
diff --git a/uv/tests/test_workspace_resolution.py b/uv/tests/test_workspace_resolution.py
index 26e9ee5..401ab13 100644
--- a/uv/tests/test_workspace_resolution.py
+++ b/uv/tests/test_workspace_resolution.py
@@ -566,3 +566,22 @@ def test_root_workspace_paths_unchanged(self):
         for path in local.values():
             resolved = posixpath.normpath(posixpath.join(".", path))
             assert resolved == path
+
+
+def test_codegen_paths_all_packages_visits_all_members():
+    raw_local = {
+        "app-one": "packages/app-one",
+        "app-two": "packages/app-two",
+    }
+    # all_packages=True derives paths for all local workspace members
+    codegen_paths = list(dict.fromkeys(raw_local.values())) or ["."]
+    assert codegen_paths == ["packages/app-one", "packages/app-two"]
+
+    # explicit selection visits only requested members
+    packages = ["app-one"]
+    codegen_paths = list(dict.fromkeys(raw_local[p] for p in packages if p in raw_local)) or ["."]
+    assert codegen_paths == ["packages/app-one"]
+
+    # bare root fallback when no members or selection
+    codegen_paths = list(dict.fromkeys(raw_local[p] for p in [] if p in raw_local)) or ["."]
+    assert codegen_paths == ["."]