diff --git a/features/src/cccl-dev/devcontainer-feature.json b/features/src/cccl-dev/devcontainer-feature.json
index 95b16301..6fcfbb7c 100644
--- a/features/src/cccl-dev/devcontainer-feature.json
+++ b/features/src/cccl-dev/devcontainer-feature.json
@@ -1,7 +1,7 @@
 {
   "name": "NVIDIA CCCL development utilities",
   "id": "cccl-dev",
-  "version": "26.2.0",
+  "version": "26.2.1",
   "description": "A feature to install NVIDIA CCCL development utilities",
   "options": {
     "litVersion": {
diff --git a/features/src/cccl-dev/install.sh b/features/src/cccl-dev/install.sh
index e0442d32..7d7d1d4d 100644
--- a/features/src/cccl-dev/install.sh
+++ b/features/src/cccl-dev/install.sh
@@ -65,7 +65,7 @@ DOXYGEN_URL="https://github.com/doxygen/doxygen/releases/download/Release_${DOXY
 
 (
   TEMPDEST=$(mktemp -d)
-  wget --no-hsts -q "$DOXYGEN_URL" -O "$TEMPDEST/doxygen.tar.gz"
+  wget --no-hsts -q --tries=3 --timeout=30 "$DOXYGEN_URL" -O "$TEMPDEST/doxygen.tar.gz"
   cd "$TEMPDEST"
   tar --strip-components=1 -xf doxygen.tar.gz
   make install -j
diff --git a/features/src/cmake/devcontainer-feature.json b/features/src/cmake/devcontainer-feature.json
index ea1ae546..3313fa99 100644
--- a/features/src/cmake/devcontainer-feature.json
+++ b/features/src/cmake/devcontainer-feature.json
@@ -1,7 +1,7 @@
 {
   "name": "CMake",
   "id": "cmake",
-  "version": "26.2.0",
+  "version": "26.2.1",
   "description": "A feature to install CMake",
   "options": {
     "version": {
diff --git a/features/src/cmake/install.sh b/features/src/cmake/install.sh
index b9a603e9..0583b945 100644
--- a/features/src/cmake/install.sh
+++ b/features/src/cmake/install.sh
@@ -15,12 +15,12 @@ echo "Downloading CMake...";
 
 if [[ "${CMAKE_VERSION}" == "latest" ]]; then
     find_version_from_git_tags CMAKE_VERSION https://github.com/Kitware/CMake;
-    while ! wget --no-hsts -q -O /tmp/cmake_${CMAKE_VERSION}.sh https://github.com/Kitware/CMake/releases/download/v${CMAKE_VERSION}/cmake-${CMAKE_VERSION}-linux-$(uname -p).sh; do
+    while ! wget --no-hsts -q --tries=3 --timeout=30 -O /tmp/cmake_${CMAKE_VERSION}.sh https://github.com/Kitware/CMake/releases/download/v${CMAKE_VERSION}/cmake-${CMAKE_VERSION}-linux-$(uname -p).sh; do
         echo "(!) cmake version ${CMAKE_VERSION} failed to download. Attempting to fall back one version to retry...";
         find_prev_version_from_git_tags CMAKE_VERSION https://github.com/Kitware/CMake;
     done
 else
-    wget --no-hsts -q -O /tmp/cmake_${CMAKE_VERSION}.sh https://github.com/Kitware/CMake/releases/download/v${CMAKE_VERSION}/cmake-${CMAKE_VERSION}-linux-$(uname -p).sh;
+    wget --no-hsts -q --tries=3 --timeout=30 -O /tmp/cmake_${CMAKE_VERSION}.sh https://github.com/Kitware/CMake/releases/download/v${CMAKE_VERSION}/cmake-${CMAKE_VERSION}-linux-$(uname -p).sh;
 fi
 
 echo "Installing CMake...";
diff --git a/features/src/cuda/devcontainer-feature.json b/features/src/cuda/devcontainer-feature.json
index 7a1abbc7..08be993f 100644
--- a/features/src/cuda/devcontainer-feature.json
+++ b/features/src/cuda/devcontainer-feature.json
@@ -1,7 +1,7 @@
 {
   "name": "CUDA Toolkit",
   "id": "cuda",
-  "version": "26.2.0",
+  "version": "26.2.1",
   "description": "A feature to install the NVIDIA CUDA Toolkit",
   "options": {
     "version": {
diff --git a/features/src/cuda/install.sh b/features/src/cuda/install.sh
index 7e0b218d..c419daba 100644
--- a/features/src/cuda/install.sh
+++ b/features/src/cuda/install.sh
@@ -38,7 +38,7 @@ fi
 
 get_cuda_deb() {
     local deb="$(                                 \
-        wget --no-hsts -q -O- "${1}/Packages"     \
+        wget --no-hsts -q --tries=3 --timeout=30 -O- "${1}/Packages"     \
     | grep -P "^Filename: \./${2}(.*)\.deb$"      \
     | sort -Vr | head -n1 | cut -d' ' -f2         \
     )";
@@ -46,7 +46,7 @@ get_cuda_deb() {
         echo "Error: No matching .deb found for '${1}' and '${2}'" >&2
         return 1
     fi
-    wget --no-hsts -q -O "/tmp/${deb#./}" "${1}/${deb#./}";
+    wget --no-hsts -q --tries=3 --timeout=30 -O "/tmp/${deb#./}" "${1}/${deb#./}";
     echo -n "/tmp/${deb#./}";
 }
 
diff --git a/features/src/gcc/devcontainer-feature.json b/features/src/gcc/devcontainer-feature.json
index be692326..962e1e74 100644
--- a/features/src/gcc/devcontainer-feature.json
+++ b/features/src/gcc/devcontainer-feature.json
@@ -1,7 +1,7 @@
 {
   "name": "GCC",
   "id": "gcc",
-  "version": "26.2.0",
+  "version": "26.2.1",
   "description": "A feature to install gcc",
   "options": {
     "version": {
diff --git a/features/src/gitlab-cli/devcontainer-feature.json b/features/src/gitlab-cli/devcontainer-feature.json
index 2363261c..3f56c37d 100644
--- a/features/src/gitlab-cli/devcontainer-feature.json
+++ b/features/src/gitlab-cli/devcontainer-feature.json
@@ -1,6 +1,6 @@
 {
   "id": "gitlab-cli",
-  "version": "26.2.0",
+  "version": "26.2.1",
   "name": "GitLab CLI",
   "documentationURL": "https://github.com/rapidsai/devcontainers/features/tree/main/src/gitlab-cli",
   "description": "Installs the GitLab CLI. Auto-detects latest version and installs needed dependencies.",
diff --git a/features/src/gitlab-cli/install.sh b/features/src/gitlab-cli/install.sh
index eeec4101..a0ac2dd7 100755
--- a/features/src/gitlab-cli/install.sh
+++ b/features/src/gitlab-cli/install.sh
@@ -33,7 +33,7 @@ gitlab_cli_file_name() {
 download_gitlab_cli_deb() {
     local -;
     set -euo pipefail;
-    wget --no-hsts -q -O /tmp/gitlab-cli.deb \
+    wget --no-hsts -q --tries=3 --timeout=30 -O /tmp/gitlab-cli.deb \
         "https://gitlab.com/gitlab-org/cli/-/releases/v${CLI_VERSION}/downloads/$(gitlab_cli_file_name)";
 }
 
diff --git a/features/src/llvm/devcontainer-feature.json b/features/src/llvm/devcontainer-feature.json
index aadf20fa..44f9a567 100644
--- a/features/src/llvm/devcontainer-feature.json
+++ b/features/src/llvm/devcontainer-feature.json
@@ -1,7 +1,7 @@
 {
   "name": "LLVM compilers and tools",
   "id": "llvm",
-  "version": "26.2.1",
+  "version": "26.2.2",
   "description": "A feature to install LLVM compilers and tools",
   "options": {
     "version": {
diff --git a/features/src/llvm/llvm.sh b/features/src/llvm/llvm.sh
index 4b0e1bd3..0a90028d 100755
--- a/features/src/llvm/llvm.sh
+++ b/features/src/llvm/llvm.sh
@@ -131,7 +131,7 @@ if [[ -n "${CODENAME}" ]]; then
 
     retry_count=0;
 
-    while ! wget --no-hsts -q --method=HEAD \
+    while ! wget --no-hsts -q --tries=3 --timeout=30 --method=HEAD \
             "${BASE_URL}/${CODENAME}/dists/llvm-toolchain${LINKNAME}${LLVM_VERSION_PATTERNS[$LLVM_VERSION]}/Release" >/dev/null 2>&1; do
         if test $(( retry_count++ )) -ge 5; then
             LLVM_VERSION_STRING=
@@ -145,7 +145,7 @@ if [[ -n "${CODENAME}" ]]; then
     REPO_NAME="deb ${BASE_URL}/${CODENAME}/  llvm-toolchain${LINKNAME}${LLVM_VERSION_STRING} main"
 
     # check if the repository exists for the distro and version
-    if ! wget --no-hsts -q --method=HEAD "${BASE_URL}/${CODENAME}" >/dev/null 2>&1; then
+    if ! wget --no-hsts -q --tries=3 --timeout=30 --method=HEAD "${BASE_URL}/${CODENAME}" >/dev/null 2>&1; then
         if [[ -n "${CODENAME_FROM_ARGUMENTS}" ]]; then
             echo "Specified codename '${CODENAME}' is not supported by this script."
         else
@@ -160,7 +160,7 @@ fi
 
 if [ ! -f /etc/apt/trusted.gpg.d/apt.llvm.org.asc ]; then
     # download GPG key once
-    wget --no-hsts -qO- https://apt.llvm.org/llvm-snapshot.gpg.key | tee /etc/apt/trusted.gpg.d/apt.llvm.org.asc
+    wget --no-hsts -q --tries=3 --timeout=30 -O- https://apt.llvm.org/llvm-snapshot.gpg.key | tee /etc/apt/trusted.gpg.d/apt.llvm.org.asc
 fi
 
 if [[ -z "`apt-key list 2> /dev/null | grep -i llvm`" ]]; then
diff --git a/features/src/mambaforge/devcontainer-feature.json b/features/src/mambaforge/devcontainer-feature.json
index 2973e5af..5c1b9829 100644
--- a/features/src/mambaforge/devcontainer-feature.json
+++ b/features/src/mambaforge/devcontainer-feature.json
@@ -1,7 +1,7 @@
 {
   "name": "Mambaforge",
   "id": "mambaforge",
-  "version": "26.2.1",
+  "version": "26.2.2",
   "description": "A feature to install mambaforge",
   "options": {
     "version": {
diff --git a/features/src/mambaforge/install.sh b/features/src/mambaforge/install.sh
index aa0048c1..4aec8505 100644
--- a/features/src/mambaforge/install.sh
+++ b/features/src/mambaforge/install.sh
@@ -18,7 +18,7 @@ if [[ "$MINIFORGE_VERSION" == latest ]]; then
     find_version_from_git_tags MINIFORGE_VERSION https://github.com/conda-forge/miniforge "tags/" "." "-[0-9]+" "true";
 fi
 
-wget --no-hsts -q -O /tmp/miniforge.sh \
+wget --no-hsts -q --tries=3 --timeout=30 -O /tmp/miniforge.sh \
     "https://github.com/conda-forge/miniforge/releases/download/${MINIFORGE_VERSION}/Miniforge3-${MINIFORGE_VERSION}-Linux-$(uname -p).sh";
 echo "Installing Miniforge...";
 
diff --git a/features/src/ninja/devcontainer-feature.json b/features/src/ninja/devcontainer-feature.json
index 1dae9f05..01fccd5c 100644
--- a/features/src/ninja/devcontainer-feature.json
+++ b/features/src/ninja/devcontainer-feature.json
@@ -1,7 +1,7 @@
 {
   "name": "Ninja build",
   "id": "ninja",
-  "version": "26.2.0",
+  "version": "26.2.1",
   "description": "A feature to install ninja-build",
   "options": {
     "version": {
diff --git a/features/src/ninja/install.sh b/features/src/ninja/install.sh
index 04f23c26..1859d225 100644
--- a/features/src/ninja/install.sh
+++ b/features/src/ninja/install.sh
@@ -23,15 +23,21 @@ if test "$(uname -p)" = "aarch64"; then
     _name+="-aarch64";
 fi
 
-# Install Ninja
-wget --no-hsts -q -O /tmp/ninja-linux.zip \
-    "https://github.com/ninja-build/ninja/releases/download/v${NINJA_VERSION}/${_name}.zip";
+# Install Ninja with retries for network reliability
+echo "Downloading ninja v${NINJA_VERSION}...";
+wget --no-hsts -q --tries=3 --timeout=30 -O /tmp/ninja-linux.zip \
+    "https://github.com/ninja-build/ninja/releases/download/v${NINJA_VERSION}/${_name}.zip" || {
+    echo "ERROR: Failed to download ninja after 3 attempts";
+    exit 1;
+};
 unzip -d /usr/bin /tmp/ninja-linux.zip;
 chmod +x /usr/bin/ninja;
 
-# Install Ninja bash completions
-wget --no-hsts -q -O /usr/share/bash-completion/completions/ninja \
-    "https://github.com/ninja-build/ninja/raw/v${NINJA_VERSION}/misc/bash-completion";
+# Install Ninja bash completions (non-fatal if it fails)
+echo "Downloading ninja bash-completion...";
+wget --no-hsts -q --tries=3 --timeout=30 -O /usr/share/bash-completion/completions/ninja \
+    "https://github.com/ninja-build/ninja/raw/v${NINJA_VERSION}/misc/bash-completion" || \
+    echo "Warning: Failed to download ninja bash-completion (non-fatal)";
 
 # Clean up
 rm -rf /var/tmp/*;
diff --git a/features/src/nvhpc/devcontainer-feature.json b/features/src/nvhpc/devcontainer-feature.json
index 4180e4f3..88409d2d 100644
--- a/features/src/nvhpc/devcontainer-feature.json
+++ b/features/src/nvhpc/devcontainer-feature.json
@@ -1,7 +1,7 @@
 {
   "name": "NVHPC SDK",
   "id": "nvhpc",
-  "version": "26.2.1",
+  "version": "26.2.2",
   "description": "A feature to install the NVHPC SDK",
   "options": {
     "version": {
diff --git a/features/src/nvhpc/install.sh b/features/src/nvhpc/install.sh
index be96cb78..096a52ad 100644
--- a/features/src/nvhpc/install.sh
+++ b/features/src/nvhpc/install.sh
@@ -28,7 +28,7 @@ fi
 
 echo "Downloading NVHPC gpg key...";
 
-wget --no-hsts -q -O- https://developer.download.nvidia.com/hpc-sdk/ubuntu/DEB-GPG-KEY-NVIDIA-HPC-SDK \
+wget --no-hsts -q --tries=3 --timeout=30 -O- https://developer.download.nvidia.com/hpc-sdk/ubuntu/DEB-GPG-KEY-NVIDIA-HPC-SDK \
    | gpg --dearmor -o /etc/apt/trusted.gpg.d/nvidia-hpcsdk-archive-keyring.gpg;
 
 chmod 0644 /etc/apt/trusted.gpg.d/*.gpg || true;
diff --git a/features/src/oneapi/devcontainer-feature.json b/features/src/oneapi/devcontainer-feature.json
index 10b20df7..72649b80 100644
--- a/features/src/oneapi/devcontainer-feature.json
+++ b/features/src/oneapi/devcontainer-feature.json
@@ -1,7 +1,7 @@
 {
   "name": "Intel oneapi toolchain",
   "id": "oneapi",
-  "version": "26.2.0",
+  "version": "26.2.1",
   "description": "A feature to install the Intel oneapi toolchain",
   "options": {
     "version": {
diff --git a/features/src/oneapi/install.sh b/features/src/oneapi/install.sh
index 5a692135..4a8c369c 100644
--- a/features/src/oneapi/install.sh
+++ b/features/src/oneapi/install.sh
@@ -30,7 +30,7 @@ if [ -f /etc/profile.d/lmod.sh ]; then
 fi
 
 # Add Intel repo signing key
-wget --no-hsts -q -O- https://apt.repos.intel.com/intel-gpg-keys/GPG-PUB-KEY-INTEL-SW-PRODUCTS-2023.PUB \
+wget --no-hsts -q --tries=3 --timeout=30 -O- https://apt.repos.intel.com/intel-gpg-keys/GPG-PUB-KEY-INTEL-SW-PRODUCTS-2023.PUB \
    | gpg --dearmor -o /etc/apt/trusted.gpg.d/oneapi-archive-keyring.gpg;
 
 chmod 0644 /etc/apt/trusted.gpg.d/*.gpg || true;
diff --git a/features/src/openmpi/devcontainer-feature.json b/features/src/openmpi/devcontainer-feature.json
index e124eef4..85c1669d 100644
--- a/features/src/openmpi/devcontainer-feature.json
+++ b/features/src/openmpi/devcontainer-feature.json
@@ -1,7 +1,7 @@
 {
   "name": "OpenMPI",
   "id": "openmpi",
-  "version": "26.2.0",
+  "version": "26.2.1",
   "description": "A feature to install OpenMPI with optional CUDA and UCX support",
   "options": {
     "version": {
diff --git a/features/src/openmpi/install.sh b/features/src/openmpi/install.sh
index b79cd25e..3ce3089d 100755
--- a/features/src/openmpi/install.sh
+++ b/features/src/openmpi/install.sh
@@ -96,7 +96,7 @@ build_and_install_openmpi() {
 
     local -r major_minor="$(grep -o '^[0-9]*.[0-9]*' <<< "${OPENMPI_VERSION}")";
 
-    wget --no-hsts -q -O- "https://download.open-mpi.org/release/open-mpi/v${major_minor}/openmpi-${OPENMPI_VERSION}.tar.gz" \
+    wget --no-hsts -q --tries=3 --timeout=30 -O- "https://download.open-mpi.org/release/open-mpi/v${major_minor}/openmpi-${OPENMPI_VERSION}.tar.gz" \
   | tar -C /tmp/ompi -zf - --strip-components=1 -x;
 
     (
diff --git a/features/src/rapids-build-utils/devcontainer-feature.json b/features/src/rapids-build-utils/devcontainer-feature.json
index 1a43ccbb..76160822 100644
--- a/features/src/rapids-build-utils/devcontainer-feature.json
+++ b/features/src/rapids-build-utils/devcontainer-feature.json
@@ -1,7 +1,7 @@
 {
   "name": "NVIDIA RAPIDS devcontainer build utilities",
   "id": "rapids-build-utils",
-  "version": "26.2.2",
+  "version": "26.2.4",
   "description": "A feature to install the RAPIDS devcontainer build utilities",
   "containerEnv": {
     "BASH_ENV": "/etc/bash.bash_env"
diff --git a/features/src/rapids-build-utils/install.sh b/features/src/rapids-build-utils/install.sh
index 78f34900..fcc684ce 100644
--- a/features/src/rapids-build-utils/install.sh
+++ b/features/src/rapids-build-utils/install.sh
@@ -25,7 +25,7 @@ if ! command -V yq >/dev/null 2>&1; then
 
     YQ_VERSION=4.46.1;
     find_version_from_git_tags YQ_VERSION https://github.com/mikefarah/yq;
-    while ! wget --no-hsts -q -O- "https://github.com/mikefarah/yq/releases/download/v${YQ_VERSION}/${YQ_BINARY}.tar.gz" | tar -C /usr/bin -zf - -x ./${YQ_BINARY} --transform="s/${YQ_BINARY}/yq/"; do
+    while ! wget --no-hsts -q --tries=3 --timeout=30 -O- "https://github.com/mikefarah/yq/releases/download/v${YQ_VERSION}/${YQ_BINARY}.tar.gz" | tar -C /usr/bin -zf - -x ./${YQ_BINARY} --transform="s/${YQ_BINARY}/yq/"; do
         echo "(!) YQ version ${YQ_VERSION} failed to download. Attempting to fall back one version to retry...";
         find_prev_version_from_git_tags YQ_VERSION https://github.com/mikefarah/yq;
     done
diff --git a/features/src/rapids-build-utils/opt/rapids-build-utils/bin/generate-scripts.sh b/features/src/rapids-build-utils/opt/rapids-build-utils/bin/generate-scripts.sh
index 41d200e7..5c39117f 100755
--- a/features/src/rapids-build-utils/opt/rapids-build-utils/bin/generate-scripts.sh
+++ b/features/src/rapids-build-utils/opt/rapids-build-utils/bin/generate-scripts.sh
@@ -49,7 +49,7 @@ generate_script() {
     if test -n "${bin:+x}"; then
         (
             cat - \
-          | envsubst '$HOME $NAME $SRC_PATH $PY_ENV $PY_SRC $PY_LIB $BIN_DIR $CPP_ENV $CPP_LIB $CPP_SRC $CPP_CMAKE_ARGS $CPP_CPACK_ARGS $CPP_DEPS $CPP_MAX_TOTAL_SYSTEM_MEMORY $CPP_MAX_DEVICE_OBJ_MEMORY_USAGE $CPP_MAX_DEVICE_OBJ_TO_COMPILE_IN_PARALLEL $GIT_TAG $GIT_SSH_URL $GIT_HTTPS_URL $GIT_REPO $GIT_HOST $GIT_UPSTREAM $PIP_WHEEL_ARGS $PIP_INSTALL_ARGS' \
+          | envsubst '$HOME $NAME $SRC_PATH $PY_ENV $PY_SRC $PY_LIB $PY_TEST $BIN_DIR $CPP_ENV $CPP_LIB $CPP_SRC $CPP_TEST $CPP_CMAKE_ARGS $CPP_CPACK_ARGS $CPP_DEPS $CPP_MAX_TOTAL_SYSTEM_MEMORY $CPP_MAX_DEVICE_OBJ_MEMORY_USAGE $CPP_MAX_DEVICE_OBJ_TO_COMPILE_IN_PARALLEL $GIT_TAG $GIT_SSH_URL $GIT_HTTPS_URL $GIT_REPO $GIT_HOST $GIT_UPSTREAM $PIP_WHEEL_ARGS $PIP_INSTALL_ARGS' \
           | tee "${TMP_SCRIPT_DIR}/${bin}" >/dev/null;
 
             chmod +x "${TMP_SCRIPT_DIR}/${bin}";
@@ -150,6 +150,33 @@ generate_python_scripts() {
     done
 }
 
+generate_cpp_test_script() {
+    if test -n "${CPP_TEST:-}" && test -f "${TEMPLATES}/cpp.test.tmpl.sh"; then (
+        # shellcheck disable=SC2002
+        cat "${TEMPLATES}/cpp.test.tmpl.sh" \
+      | generate_script "test-${CPP_LIB}-cpp";
+    ) || true;
+    fi
+}
+
+generate_python_test_script() {
+    if test -n "${PY_TEST:-}" && test -f "${TEMPLATES}/python.test.tmpl.sh"; then (
+        # shellcheck disable=SC2002
+        cat "${TEMPLATES}/python.test.tmpl.sh" \
+      | generate_script "test-${PY_LIB}-python";
+    ) || true;
+    fi
+}
+
+generate_repo_test_script() {
+    if test -f "${TEMPLATES}/repo.test.tmpl.sh"; then (
+        # shellcheck disable=SC2002
+        cat "${TEMPLATES}/repo.test.tmpl.sh" \
+      | generate_script "test-${NAME}";
+    ) || true;
+    fi
+}
+
 generate_scripts() {
     local -;
     set -euo pipefail;
@@ -185,6 +212,7 @@ generate_scripts() {
     local cpp_name;
     local cpp_path;
     local cpp_sub_dir;
+    local cpp_test;
     local cpp_cmake_args;
     local cpp_cpack_args;
     local cpp_depends_length;
@@ -195,6 +223,7 @@ generate_scripts() {
     local py_env;
     local py_path;
     local py_name;
+    local py_test;
     local py_cmake_args;
     local pip_wheel_args;
     local pip_install_args;
@@ -254,6 +283,7 @@ generate_scripts() {
             cpp_env="${repo}_cpp_${j}_env";
             cpp_name="${repo}_cpp_${j}_name";
             cpp_sub_dir="${repo}_cpp_${j}_sub_dir";
+            cpp_test="${repo}_cpp_${j}_test";
             cpp_cmake_args="${repo}_cpp_${j}_args_cmake";
             cpp_cpack_args="${repo}_cpp_${j}_args_cpack";
             cpp_depends_length="${repo}_cpp_${j}_depends_length";
@@ -295,6 +325,7 @@ generate_scripts() {
                 CPP_ENV="${!cpp_env:-}"                                                                     \
                 CPP_LIB="${cpp_name:-}"                                                                     \
                 CPP_SRC="${!cpp_sub_dir:-}"                                                                 \
+                CPP_TEST="${!cpp_test:-}"                                                                   \
                 CPP_DEPS="${cpp_deps[*]}"                                                                   \
                 CPP_CMAKE_ARGS="${!cpp_cmake_args:-}"                                                       \
                 CPP_CPACK_ARGS="${!cpp_cpack_args:-}"                                                       \
@@ -302,6 +333,11 @@ generate_scripts() {
                 CPP_MAX_DEVICE_OBJ_MEMORY_USAGE="${!cpp_max_device_obj_memory_usage:-}"                     \
                 CPP_MAX_DEVICE_OBJ_TO_COMPILE_IN_PARALLEL="${!cpp_max_device_obj_to_compile_in_parallel:-}" \
                 generate_cpp_scripts                                                                        ;
+                NAME="${repo_name:-}"                                                                       \
+                SRC_PATH=~/"${!repo_path:-}"                                                                \
+                CPP_LIB="${cpp_name:-}"                                                                     \
+                CPP_TEST="${!cpp_test:-}"                                                                   \
+                generate_cpp_test_script                                                                    ;
             fi
         done
 
@@ -310,6 +346,7 @@ generate_scripts() {
         for ((j=0; j < ${!py_length:-0}; j+=1)); do
             py_env="${repo}_python_${j}_env";
             py_name="${repo}_python_${j}_name";
+            py_test="${repo}_python_${j}_test";
             py_cmake_args="${repo}_python_${j}_args_cmake";
             pip_wheel_args="${repo}_python_${j}_args_wheel";
             pip_install_args="${repo}_python_${j}_args_install";
@@ -352,6 +389,11 @@ generate_scripts() {
                 PIP_WHEEL_ARGS="${!pip_wheel_args:-}"     \
                 PIP_INSTALL_ARGS="${!pip_install_args:-}" \
                 generate_python_scripts                   ;
+                NAME="${repo_name:-}"                     \
+                SRC_PATH=~/"${!repo_path:-}"              \
+                PY_LIB="${py_name}"                       \
+                PY_TEST="${!py_test:-}"                   \
+                generate_python_test_script               ;
             fi
         done
 
@@ -362,6 +404,10 @@ generate_scripts() {
             PY_LIB="${py_libs[*]@Q}"   \
             CPP_LIB="${cpp_libs[*]@Q}" \
             generate_repo_scripts      ;
+            NAME="${repo_name:-}"      \
+            PY_LIB="${py_libs[*]@Q}"   \
+            CPP_LIB="${cpp_libs[*]@Q}" \
+            generate_repo_test_script  ;
         fi
 
         # Generate a clone script for each repo
@@ -383,7 +429,7 @@ generate_scripts() {
     unset cpp_name_to_path;
 
     if ((${#repo_names[@]} > 0)); then
-        for script in "clone" "clean" "configure" "build" "cpack" "install" "uninstall"; do
+        for script in "clone" "clean" "configure" "build" "cpack" "install" "uninstall" "test"; do
             # Generate a script to run a script for all repos
             NAME="${cloned_repos[0]:-${repo_names[0]:-}}" \
             NAMES="${repo_names[*]@Q}"  \
@@ -392,7 +438,7 @@ generate_scripts() {
             generate_all_script         ;
         done
 
-        for script in "clean" "build"; do
+        for script in "clean" "build" "test"; do
             # Generate a script to run C++ builds for all repos
             NAME="${cpp_names[0]:-${repo_names[0]:-}}" \
             NAMES="${cpp_names[*]@Q}"   \
diff --git a/features/src/rapids-build-utils/opt/rapids-build-utils/bin/tmpl/all.cpp.test.tmpl.sh b/features/src/rapids-build-utils/opt/rapids-build-utils/bin/tmpl/all.cpp.test.tmpl.sh
new file mode 100755
index 00000000..cf24ae3e
--- /dev/null
+++ b/features/src/rapids-build-utils/opt/rapids-build-utils/bin/tmpl/all.cpp.test.tmpl.sh
@@ -0,0 +1,32 @@
+#!/usr/bin/env bash
+
+# Usage:
+#  test-all-cpp [OPTION]...
+#
+# Runs test-<repo>-cpp for each repo in ${NAMES}.
+#
+# Forwards relevant arguments to each underlying script.
+#
+# Boolean options:
+#  -h,--help  Print this text.
+
+# shellcheck disable=SC1091
+. rapids-generate-docstring;
+
+_test_all_cpp() {
+    local -;
+    set -euo pipefail;
+
+    eval "$(_parse_args --take '-h,--help' "$@" <&0)";
+
+    # shellcheck disable=SC1091
+    . devcontainer-utils-debug-output 'rapids_build_utils_debug' 'test-all test-all-cpp';
+
+    for name in ${NAMES}; do
+        if command -V test-${name}-cpp >/dev/null 2>&1; then
+            test-${name}-cpp "${OPTS[@]}";
+        fi
+    done
+}
+
+_test_all_cpp "$@" <&0;
diff --git a/features/src/rapids-build-utils/opt/rapids-build-utils/bin/tmpl/all.python.test.tmpl.sh b/features/src/rapids-build-utils/opt/rapids-build-utils/bin/tmpl/all.python.test.tmpl.sh
new file mode 100755
index 00000000..c2b66a41
--- /dev/null
+++ b/features/src/rapids-build-utils/opt/rapids-build-utils/bin/tmpl/all.python.test.tmpl.sh
@@ -0,0 +1,32 @@
+#!/usr/bin/env bash
+
+# Usage:
+#  test-all-python [OPTION]...
+#
+# Runs test-<repo>-python for each repo in ${NAMES}.
+#
+# Forwards relevant arguments to each underlying script.
+#
+# Boolean options:
+#  -h,--help  Print this text.
+
+# shellcheck disable=SC1091
+. rapids-generate-docstring;
+
+_test_all_python() {
+    local -;
+    set -euo pipefail;
+
+    eval "$(_parse_args --take '-h,--help' "$@" <&0)";
+
+    # shellcheck disable=SC1091
+    . devcontainer-utils-debug-output 'rapids_build_utils_debug' 'test-all test-all-python';
+
+    for name in ${NAMES}; do
+        if command -V test-${name}-python >/dev/null 2>&1; then
+            test-${name}-python "${OPTS[@]}";
+        fi
+    done
+}
+
+_test_all_python "$@" <&0;
diff --git a/features/src/rapids-build-utils/opt/rapids-build-utils/bin/tmpl/all.test.tmpl.sh b/features/src/rapids-build-utils/opt/rapids-build-utils/bin/tmpl/all.test.tmpl.sh
new file mode 100755
index 00000000..0ee21917
--- /dev/null
+++ b/features/src/rapids-build-utils/opt/rapids-build-utils/bin/tmpl/all.test.tmpl.sh
@@ -0,0 +1,32 @@
+#!/usr/bin/env bash
+
+# Usage:
+#  test-all [OPTION]...
+#
+# Runs test-<repo> for each repo in ${NAMES}.
+#
+# Forwards relevant arguments to each underlying script.
+#
+# Boolean options:
+#  -h,--help  Print this text.
+
+# shellcheck disable=SC1091
+. rapids-generate-docstring;
+
+test_all() {
+    local -;
+    set -euo pipefail;
+
+    eval "$(_parse_args --take '-h,--help' "$@" <&0)";
+
+    # shellcheck disable=SC1091
+    . devcontainer-utils-debug-output 'rapids_build_utils_debug' 'test-all';
+
+    for name in ${NAMES}; do
+        if command -V test-${name} >/dev/null 2>&1; then
+            test-${name} "${OPTS[@]}";
+        fi
+    done
+}
+
+test_all "$@" <&0;
diff --git a/features/src/rapids-build-utils/opt/rapids-build-utils/bin/tmpl/cpp.test.tmpl.sh b/features/src/rapids-build-utils/opt/rapids-build-utils/bin/tmpl/cpp.test.tmpl.sh
new file mode 100755
index 00000000..84e98345
--- /dev/null
+++ b/features/src/rapids-build-utils/opt/rapids-build-utils/bin/tmpl/cpp.test.tmpl.sh
@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+
+# Usage:
+#  test-${CPP_LIB}-cpp [OPTION]...
+#
+# Run ${CPP_LIB} C++ tests.
+#
+# Boolean options:
+#  -h,--help  Print this text.
+
+# shellcheck disable=SC1091
+. rapids-generate-docstring;
+
+test_${CPP_LIB}_cpp() {
+    local -;
+    set -euo pipefail;
+
+    eval "$(_parse_args --take '-h,--help' "$@" <&0)";
+
+    # shellcheck disable=SC1091
+    . devcontainer-utils-debug-output 'rapids_build_utils_debug' 'test-all test-${NAME} test-${CPP_LIB}-cpp';
+
+    if [[ ! -d "${SRC_PATH}" ]]; then
+        echo "test-${CPP_LIB}-cpp: cannot access '${SRC_PATH}': No such directory" >&2;
+        return 1;
+    fi
+
+    time (
+        cd "${SRC_PATH}";
+        ./${CPP_TEST} "${OPTS[@]}";
+    )
+}
+
+test_${CPP_LIB}_cpp "$@" <&0;
diff --git a/features/src/rapids-build-utils/opt/rapids-build-utils/bin/tmpl/python.test.tmpl.sh b/features/src/rapids-build-utils/opt/rapids-build-utils/bin/tmpl/python.test.tmpl.sh
new file mode 100755
index 00000000..c2d180d0
--- /dev/null
+++ b/features/src/rapids-build-utils/opt/rapids-build-utils/bin/tmpl/python.test.tmpl.sh
@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+
+# Usage:
+#  test-${PY_LIB}-python [OPTION]...
+#
+# Run ${PY_LIB} Python tests.
+#
+# Boolean options:
+#  -h,--help  Print this text.
+
+# shellcheck disable=SC1091
+. rapids-generate-docstring;
+
+test_${PY_LIB}_python() {
+    local -;
+    set -euo pipefail;
+
+    eval "$(_parse_args --take '-h,--help' "$@" <&0)";
+
+    # shellcheck disable=SC1091
+    . devcontainer-utils-debug-output 'rapids_build_utils_debug' 'test-all test-${NAME} test-${PY_LIB}-python';
+
+    if [[ ! -d "${SRC_PATH}" ]]; then
+        echo "test-${PY_LIB}-python: cannot access '${SRC_PATH}': No such directory" >&2;
+        return 1;
+    fi
+
+    time (
+        cd "${SRC_PATH}";
+        ./${PY_TEST} "${OPTS[@]}";
+    )
+}
+
+test_${PY_LIB}_python "$@" <&0;
diff --git a/features/src/rapids-build-utils/opt/rapids-build-utils/bin/tmpl/repo.test.tmpl.sh b/features/src/rapids-build-utils/opt/rapids-build-utils/bin/tmpl/repo.test.tmpl.sh
new file mode 100755
index 00000000..bf4f625f
--- /dev/null
+++ b/features/src/rapids-build-utils/opt/rapids-build-utils/bin/tmpl/repo.test.tmpl.sh
@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+
+# Usage:
+#  test-${NAME} [OPTION]...
+#
+# Run ${NAME} tests.
+#
+# Forwards relevant arguments to each underlying script.
+#
+# Boolean options:
+#  -h,--help  Print this text.
+
+# shellcheck disable=SC1091
+. rapids-generate-docstring;
+
+test_${NAME}() {
+    local -;
+    set -euo pipefail;
+
+    eval "$(_parse_args --take '-h,--help' "$@" <&0)";
+
+    # shellcheck disable=SC1091
+    . devcontainer-utils-debug-output 'rapids_build_utils_debug' 'test-all test-${NAME}';
+
+    for lib in ${CPP_LIB}; do
+        if command -V test-${lib}-cpp >/dev/null 2>&1; then
+            test-${lib}-cpp "${OPTS[@]}";
+        fi
+    done
+
+    for lib in ${PY_LIB}; do
+        if command -V test-${lib}-python >/dev/null 2>&1; then
+            test-${lib}-python "${OPTS[@]}";
+        fi
+    done
+}
+
+test_${NAME} "$@" <&0;
diff --git a/features/src/rapids-build-utils/opt/rapids-build-utils/manifest.yaml b/features/src/rapids-build-utils/opt/rapids-build-utils/manifest.yaml
index d244fb5c..a70fcdc3 100755
--- a/features/src/rapids-build-utils/opt/rapids-build-utils/manifest.yaml
+++ b/features/src/rapids-build-utils/opt/rapids-build-utils/manifest.yaml
@@ -16,6 +16,7 @@ repos:
   cpp:
     - name: rmm
       sub_dir: cpp
+      test: ci/run_ctests.sh
   python:
     - name: librmm
       sub_dir: python/librmm
@@ -25,6 +26,7 @@ repos:
       sub_dir: python/rmm
       depends: [rmm]
       args: {install: *rapids_build_backend_args}
+      test: ci/run_pytests.sh
 
 - name: ucxx
   path: ucxx
@@ -57,6 +59,7 @@ repos:
   git: {<<: *git_defaults, repo: dask-cuda}
   python:
     - name: dask-cuda
+      test: ci/run_pytest.sh
 
 - name: kvikio
   path: kvikio
@@ -64,6 +67,7 @@ repos:
   cpp:
     - name: kvikio
       sub_dir: cpp
+      test: ci/run_ctests.sh
   python:
     - name: libkvikio
       sub_dir: python/libkvikio
@@ -73,6 +77,7 @@ repos:
       sub_dir: python/kvikio
       depends: [kvikio]
       args: {install: *rapids_build_backend_args}
+      test: ci/run_pytests.sh
 
 - name: cudf
   path: cudf
@@ -81,9 +86,11 @@ repos:
     - name: cudf
       sub_dir: cpp
       depends: [rmm, kvikio]
+      test: ci/run_cudf_ctests.sh
     - name: cudf_kafka
       sub_dir: cpp/libcudf_kafka
       depends: [cudf]
+      test: ci/run_cudf_kafka_ctests.sh
   python:
     - name: libcudf
       sub_dir: python/libcudf
@@ -93,23 +100,29 @@ repos:
       sub_dir: python/pylibcudf
       depends: [cudf]
       args: {install: *rapids_build_backend_args}
+      test: ci/run_pylibcudf_pytests.sh
     - name: cudf
       sub_dir: python/cudf
       depends: [cudf]
       args: {install: *rapids_build_backend_args}
+      test: ci/run_cudf_pytests.sh
     - name: dask-cudf
       sub_dir: python/dask_cudf
       args: {install: *rapids_build_backend_args}
+      test: ci/run_dask_cudf_pytests.sh
     - name: cudf-polars
       sub_dir: python/cudf_polars
       args: {install: *rapids_build_backend_args}
+      test: ci/run_cudf_polars_pytests.sh
     - name: cudf_kafka
       sub_dir: python/cudf_kafka
       depends: [cudf_kafka]
       args: {install: *rapids_build_backend_args}
+      test: ci/run_cudf_kafka_pytests.sh
     - name: custreamz
       sub_dir: python/custreamz
       args: {install: *rapids_build_backend_args}
+      test: ci/run_custreamz_pytests.sh
 
 - name: rapidsmpf
   path: rapidsmpf
@@ -118,6 +131,7 @@ repos:
     - name: rapidsmpf
       sub_dir: cpp
       depends: [rmm, ucxx, cudf]
+      test: ci/run_ctests.sh
   python:
     - name: librapidsmpf
       sub_dir: python/librapidsmpf
@@ -127,6 +141,7 @@ repos:
       sub_dir: python/rapidsmpf
       depends: [rapidsmpf, ucxx-python]
       args: {install: *rapids_build_backend_args}
+      test: ci/run_pytests.sh
 
 - name: raft
   path: raft
@@ -138,6 +153,7 @@ repos:
       parallelism:
         max_device_obj_memory_usage: 3Gi
       args: {cmake: -DRAFT_COMPILE_LIBRARY=ON}
+      test: ci/run_ctests.sh
   python:
     - name: libraft
       sub_dir: python/libraft
@@ -147,10 +163,12 @@ repos:
       sub_dir: python/pylibraft
       depends: [raft]
       args: {install: *rapids_build_backend_args}
+      test: ci/run_pylibraft_pytests.sh
     - name: raft-dask
       sub_dir: python/raft-dask
       depends: [ucxx, raft]
       args: {install: *rapids_build_backend_args}
+      test: ci/run_raft_dask_pytests.sh
 
 - name: cuvs
   path: cuvs
@@ -162,6 +180,7 @@ repos:
       parallelism:
         max_device_obj_memory_usage: 3Gi
       args: {cmake: -DBUILD_C_LIBRARY=ON}
+      test: ci/run_ctests.sh
   python:
     - name: libcuvs
       sub_dir: python/libcuvs
@@ -171,6 +190,7 @@ repos:
       sub_dir: python/cuvs
       depends: [cuvs]
       args: {install: *rapids_build_backend_args}
+      test: ci/run_cuvs_pytests.sh
 
 - name: cumlprims_mg
   path: cumlprims_mg
@@ -191,6 +211,7 @@ repos:
       depends: [rmm, raft, cumlprims_mg, cuvs]
       parallelism:
         max_device_obj_memory_usage: 3Gi
+      test: ci/run_ctests.sh
   python:
     - name: libcuml
       sub_dir: python/libcuml
@@ -200,6 +221,7 @@ repos:
       sub_dir: python/cuml
       depends: [cuml]
       args: {install: *rapids_build_backend_args}
+      test: ci/run_cuml_singlegpu_pytests.sh
 
 - name: cugraph
   path: cugraph
@@ -210,6 +232,7 @@ repos:
       depends: [rmm, ucxx, raft]
       parallelism:
         max_device_obj_memory_usage: 6Gi
+      test: ci/run_ctests.sh
     - name: cugraph_etl
       sub_dir: cpp/libcugraph_etl
       depends: [cudf, cugraph]
@@ -223,10 +246,12 @@ repos:
       sub_dir: python/pylibcugraph
       depends: [cugraph]
       args: {install: *rapids_build_backend_args}
+      test: ci/run_pylibcugraph_pytests.sh
     - name: cugraph
       sub_dir: python/cugraph
       depends: [cugraph]
       args: {install: *rapids_build_backend_args}
+      test: ci/run_cugraph_pytests.sh
 
 - name: cugraph-gnn
   path: cugraph-gnn
@@ -237,6 +262,7 @@ repos:
       depends: [raft]
       args:
         cmake: -DCMAKE_CUDA_ARCHITECTURES="${CUDAARCHS}"
+      test: ci/run_ctests.sh
   python:
     - name: libwholegraph
       sub_dir: python/libwholegraph
@@ -246,9 +272,11 @@ repos:
       sub_dir: python/pylibwholegraph
       depends: [wholegraph]
       args: {install: *rapids_build_backend_args}
+      test: ci/run_pylibwholegraph_pytests.sh
     - name: cugraph_pyg
       sub_dir: python/cugraph-pyg
       args: {install: *rapids_build_backend_args}
+      test: ci/run_cugraph_pyg_pytests.sh
 
 - name: nx-cugraph
   path: nx-cugraph
diff --git a/features/src/sccache/devcontainer-feature.json b/features/src/sccache/devcontainer-feature.json
index e24ca35b..767a7ec2 100644
--- a/features/src/sccache/devcontainer-feature.json
+++ b/features/src/sccache/devcontainer-feature.json
@@ -1,7 +1,7 @@
 {
   "name": "sccache",
   "id": "sccache",
-  "version": "26.2.0",
+  "version": "26.2.1",
   "description": "A feature to install sccache",
   "options": {
     "repository": {
diff --git a/features/src/sccache/install.sh b/features/src/sccache/install.sh
index c73559f6..1ab2772a 100644
--- a/features/src/sccache/install.sh
+++ b/features/src/sccache/install.sh
@@ -25,7 +25,7 @@ elif test "$SCCACHE_VERSION" = dev; then
 fi
 
 # Install sccache
-wget --no-hsts -q -O- \
+wget --no-hsts -q --tries=3 --timeout=30 -O- \
     "https://github.com/$SCCACHE_REPOSITORY/releases/download/v$SCCACHE_VERSION/sccache-v$SCCACHE_VERSION-$(uname -m)-unknown-linux-musl.tar.gz" \
   | tar -C /usr/bin -zf - --wildcards --strip-components=1 -x '*/sccache' \
  && chmod +x /usr/bin/sccache;
diff --git a/features/src/ucx/devcontainer-feature.json b/features/src/ucx/devcontainer-feature.json
index 56c374ca..06d3a64e 100644
--- a/features/src/ucx/devcontainer-feature.json
+++ b/features/src/ucx/devcontainer-feature.json
@@ -1,7 +1,7 @@
 {
   "name": "UCX",
   "id": "ucx",
-  "version": "26.2.0",
+  "version": "26.2.1",
   "description": "A feature to install UCX",
   "options": {
     "version": {
diff --git a/features/src/ucx/install.sh b/features/src/ucx/install.sh
index b7478179..d805d948 100755
--- a/features/src/ucx/install.sh
+++ b/features/src/ucx/install.sh
@@ -38,12 +38,12 @@ download_ucx_release() {
 
     if [ "$(uname -p)" = "x86_64" ]; then
         # https://github.com/openucx/ucx/releases/download/v1.15.0-rc3/ucx-1.15.0-rc3-ubuntu22.04-mofed5-cuda12-x86_64.tar.bz2
-        if ! wget --no-hsts -q -O /tmp/ucx.tar.bz2 "https://github.com/openucx/ucx/releases/download/v${UCX_VERSION}/${slug}-$(uname -p).tar.bz2"; then
+        if ! wget --no-hsts -q --tries=3 --timeout=30 -O /tmp/ucx.tar.bz2 "https://github.com/openucx/ucx/releases/download/v${UCX_VERSION}/${slug}-$(uname -p).tar.bz2"; then
             # https://github.com/openucx/ucx/releases/download/v1.14.1/ucx-1.14.1-ubuntu22.04-mofed5-cuda12.tar.bz2
-            wget --no-hsts -q -O /tmp/ucx.tar.bz2 "https://github.com/openucx/ucx/releases/download/v${UCX_VERSION}/${slug}.tar.bz2";
+            wget --no-hsts -q --tries=3 --timeout=30 -O /tmp/ucx.tar.bz2 "https://github.com/openucx/ucx/releases/download/v${UCX_VERSION}/${slug}.tar.bz2";
         fi
     else
-        wget --no-hsts -q -O /tmp/ucx.tar.bz2 "https://github.com/openucx/ucx/releases/download/v${UCX_VERSION}/${slug}-$(uname -p).tar.bz2";
+        wget --no-hsts -q --tries=3 --timeout=30 -O /tmp/ucx.tar.bz2 "https://github.com/openucx/ucx/releases/download/v${UCX_VERSION}/${slug}-$(uname -p).tar.bz2";
     fi
 }
 
diff --git a/features/src/utils/devcontainer-feature.json b/features/src/utils/devcontainer-feature.json
index a1a98e2f..98a1bc49 100644
--- a/features/src/utils/devcontainer-feature.json
+++ b/features/src/utils/devcontainer-feature.json
@@ -1,7 +1,7 @@
 {
   "name": "devcontainer-utils",
   "id": "utils",
-  "version": "26.2.3",
+  "version": "26.2.5",
   "description": "A feature to install RAPIDS devcontainer utility scripts",
   "containerEnv": {
     "BASH_ENV": "/etc/bash.bash_env"
diff --git a/features/src/utils/install.sh b/features/src/utils/install.sh
index fb814dd1..0a4897e7 100644
--- a/features/src/utils/install.sh
+++ b/features/src/utils/install.sh
@@ -53,7 +53,7 @@ if ! command -V yq >/dev/null 2>&1; then
 
     YQ_VERSION=4.46.1;
     find_version_from_git_tags YQ_VERSION https://github.com/mikefarah/yq;
-    while ! wget --no-hsts -q -O- "https://github.com/mikefarah/yq/releases/download/v${YQ_VERSION}/${YQ_BINARY}.tar.gz" | tar -C /usr/bin -zf - -x ./${YQ_BINARY} --transform="s/${YQ_BINARY}/yq/"; do
+    while ! wget --no-hsts -q --tries=3 --timeout=30 -O- "https://github.com/mikefarah/yq/releases/download/v${YQ_VERSION}/${YQ_BINARY}.tar.gz" | tar -C /usr/bin -zf - -x ./${YQ_BINARY} --transform="s/${YQ_BINARY}/yq/"; do
         echo "(!) YQ version ${YQ_VERSION} failed to download. Attempting to fall back one version to retry...";
         find_prev_version_from_git_tags YQ_VERSION https://github.com/mikefarah/yq;
     done
@@ -206,8 +206,17 @@ if test -n "${USERNAME:+x}"; then
             ;
         NV_GHA_AWS_VERSION=latest
         find_version_from_git_tags NV_GHA_AWS_VERSION https://github.com/nv-gha-runners/gh-nv-gha-aws;
-        wget --no-hsts -q -O "$USERHOME/.local/share/gh/extensions/gh-nv-gha-aws/gh-nv-gha-aws" \
-            "https://github.com/nv-gha-runners/gh-nv-gha-aws/releases/download/v${NV_GHA_AWS_VERSION}/gh-nv-gha-aws_v${NV_GHA_AWS_VERSION}_linux-$(dpkg --print-architecture | awk -F'-' '{print $NF}')";
+        echo "Downloading gh-nv-gha-aws v${NV_GHA_AWS_VERSION}...";
+        # Use verbose output for debugging, explicit CA cert for mitmproxy, and retry delays
+        wget --no-hsts --verbose --tries=3 --timeout=30 --waitretry=5 \
+            --ca-certificate=/etc/ssl/certs/ca-certificates.crt \
+            --dns-timeout=10 --connect-timeout=30 \
+            -O "$USERHOME/.local/share/gh/extensions/gh-nv-gha-aws/gh-nv-gha-aws" \
+            "https://github.com/nv-gha-runners/gh-nv-gha-aws/releases/download/v${NV_GHA_AWS_VERSION}/gh-nv-gha-aws_v${NV_GHA_AWS_VERSION}_linux-$(dpkg --print-architecture | awk -F'-' '{print $NF}')" || {
+            echo "ERROR: Failed to download gh-nv-gha-aws after 3 attempts with 5s delays";
+            echo "URL attempted: https://github.com/nv-gha-runners/gh-nv-gha-aws/releases/download/v${NV_GHA_AWS_VERSION}/gh-nv-gha-aws_v${NV_GHA_AWS_VERSION}_linux-$(dpkg --print-architecture | awk -F'-' '{print $NF}')";
+            exit 1;
+        };
         chmod 0755 "$USERHOME/.local/share/gh/extensions/gh-nv-gha-aws/gh-nv-gha-aws";
         cat <<EOF >"$USERHOME/.local/share/gh/extensions/gh-nv-gha-aws/manifest.yml"
 owner: nv-gha-runners
diff --git a/features/src/utils/opt/devcontainer/bin/sccache/install.sh b/features/src/utils/opt/devcontainer/bin/sccache/install.sh
index d91627aa..4c154f96 100755
--- a/features/src/utils/opt/devcontainer/bin/sccache/install.sh
+++ b/features/src/utils/opt/devcontainer/bin/sccache/install.sh
@@ -40,11 +40,11 @@ _install_sccache() {
     fi
 
     sccache_bin_dir="$(dirname "$(which sccache 2>/dev/null || echo "/usr/bin/sccache")")";
-    old_sccache_version="$(sccache --version | cut -d' ' -f2 || echo "sccache not installed")";
+    old_sccache_version="$(sccache --version 2>/dev/null | cut -d' ' -f2 || echo "sccache not installed")";
 
     attempts=0
     while test "${new_sccache_version:-latest}" = latest; do
-        new_sccache_version="$(wget --no-hsts -q -O- "https://api.github.com/repos/${github_repo}/releases/latest" | jq -r '.tag_name | sub("^v"; "")')";
+        new_sccache_version="$(gh api repos/${github_repo}/releases/latest --jq '.tag_name | sub("^v"; "")')";
         if test -n "${new_sccache_version:+x}"; then
             break;
         elif test "$((attempts++))" -lt 10; then
@@ -61,7 +61,7 @@ _install_sccache() {
     if test -n "${old_sccache_version##"${new_sccache_version}"}"; then
         # Install sccache to "$sccache_bin_dir"
         echo "Downloading sccache v${new_sccache_version}..." >&2
-        while ! wget --no-hsts -q -O- "https://github.com/${github_repo}/releases/download/v${new_sccache_version}/sccache-v${new_sccache_version}-$(uname -m)-unknown-linux-musl.tar.gz" \
+        while ! gh release download "v${new_sccache_version}" -R "${github_repo}" -p "sccache-v${new_sccache_version}-$(uname -m)-unknown-linux-musl.tar.gz" -O- \
               | sudo tar -C "$sccache_bin_dir" -zf - --overwrite --wildcards --strip-components=1 -x '*/sccache'; do
             if test "$((attempts++))" -lt 10; then
                 echo "(!) Failed to download sccache v${new_sccache_version}. Retrying (${attempts}/10)..." >&2;
diff --git a/matrix.yml b/matrix.yml
index c782f300..b08c2d00 100644
--- a/matrix.yml
+++ b/matrix.yml
@@ -170,6 +170,8 @@ include:
 
   # CTK 12.0 doesn't know that it supports 14.40+, use 14.39:
   - { features: [{ <<: *cuda_prev_min, <<: *cccl_cuda_opts }, { name: "cl", version: "14.39" }] } # MSVC 2022
+  # Build CUDA 12.9 + 14.43 for stdexec:
+  - { features: [{ <<: *cuda_prev_max, <<: *cccl_cuda_opts }, { name: "cl", version: "14.43" }] } # MSVC 2022
   # Still, we build a 12.0 + 14.4X image for python testing infra:
   - { features: [{ <<: *cuda_prev_min, <<: *cccl_cuda_opts }, { name: "cl", version: "14.44" }] } # MSVC 2022
   - { features: [{ <<: *cuda_prev_max, <<: *cccl_cuda_opts }, { name: "cl", version: "14.44" }] } # MSVC 2022