diff --git a/etc/spack/defaults/packages.yaml b/etc/spack/defaults/packages.yaml
index b9fdd4b3dbaf86..830bf07e5cfa3d 100644
--- a/etc/spack/defaults/packages.yaml
+++ b/etc/spack/defaults/packages.yaml
@@ -69,6 +69,11 @@ packages:
       yacc: [bison, byacc]
       ziglang: [zig]
       zlib-api: [zlib-ng+compat, zlib]
+      # Dummy providers for module hierarchy (JCSDA repo only):
+      esmf_virtual: [esmf]
+      hdf5_virtual: [hdf5]
+      netcdf_c_virtual: [netcdf-c]
+      python_virtual: [python]
     permissions:
       read: world
       write: user
diff --git a/var/spack/repos/builtin/packages/esmf/package.py b/var/spack/repos/builtin/packages/esmf/package.py
index 98ac62e7e57d2e..361e8a8d7ddd65 100644
--- a/var/spack/repos/builtin/packages/esmf/package.py
+++ b/var/spack/repos/builtin/packages/esmf/package.py
@@ -66,6 +66,9 @@ class Esmf(MakefilePackage, PythonExtension):
         deprecated=True,
     )
 
+    # For module hierarchy (JCSDA repo only):
+    provides("esmf_virtual")
+
     depends_on("c", type="build")  # generated
     depends_on("cxx", type="build")  # generated
     depends_on("fortran", type="build")  # generated
diff --git a/var/spack/repos/builtin/packages/hdf5/package.py b/var/spack/repos/builtin/packages/hdf5/package.py
index cf06058312058f..8dcf7abfd4d0bd 100644
--- a/var/spack/repos/builtin/packages/hdf5/package.py
+++ b/var/spack/repos/builtin/packages/hdf5/package.py
@@ -109,6 +109,9 @@ class Hdf5(CMakePackage):
     version("1.8.12", sha256="b5cccea850096962b5fd9e96f22c4f47d2379224bb41130d9bc038bb6c37dfcb")
     version("1.8.10", sha256="4813b79c5fb8701a625b9924b8203bc7154a77f9b826ad4e034144b4056a160a")
 
+    # For module hierarchy (JCSDA repo only):
+    provides("hdf5_virtual")
+
     depends_on("c", type="build")  # generated
     depends_on("cxx", type="build")  # generated
     depends_on("fortran", type="build")  # generated
diff --git a/var/spack/repos/builtin/packages/netcdf-c/package.py b/var/spack/repos/builtin/packages/netcdf-c/package.py
index 986fbfe7492ddf..9ea284a57bf159 100644
--- a/var/spack/repos/builtin/packages/netcdf-c/package.py
+++ b/var/spack/repos/builtin/packages/netcdf-c/package.py
@@ -53,6 +53,9 @@ class NetcdfC(CMakePackage, AutotoolsPackage):
     version("4.3.3.1", sha256="f2ee78eb310637c007f001e7c18e2d773d23f3455242bde89647137b7344c2e2")
     version("4.3.3", sha256="3f16e21bc3dfeb3973252b9addf5defb48994f84fc9c9356081f871526a680e7")
 
+    # For module hierarchy (JCSDA repo only):
+    provides("netcdf_c_virtual")
+
     depends_on("c", type="build")  # generated
     depends_on("cxx", type="build")  # generated
 
diff --git a/var/spack/repos/builtin/packages/python/package.py b/var/spack/repos/builtin/packages/python/package.py
index fb470b3af2a5ae..78e752071df586 100644
--- a/var/spack/repos/builtin/packages/python/package.py
+++ b/var/spack/repos/builtin/packages/python/package.py
@@ -222,6 +222,9 @@ class Python(Package):
         deprecated=True,
     )
 
+    # For module hierarchy (JCSDA repo only):
+    provides("python_virtual")
+
     depends_on("c", type="build")  # generated
     depends_on("cxx", type="build")  # generated