diff --git a/action.yaml b/action.yaml
new file mode 100644
index 0000000..84919f6
--- /dev/null
+++ b/action.yaml
@@ -0,0 +1,31 @@
+name: 'Format Stack Name'
+description: 'Formats repository name for use as stack name.'
+outputs:
+  name:
+    description: 'Formatted stack name'
+  org:
+    description: 'Formatted organization name'
+  repo:
+    description: 'Formatted repository name'
+runs:
+  using: 'composite'
+  steps:
+    - shell: bash
+      run: |
+        FULL_REPO="${{ github.repository }}"
+        echo "Debug: FULL_REPO=$FULL_REPO"
+
+        ORG=$(echo "$FULL_REPO" | cut -d'/' -f1)
+        REPO=$(echo "$FULL_REPO" | cut -d'/' -f2)
+        echo "Debug: ORG=$ORG, REPO=$REPO"
+
+        FORMATTED_ORG=$(echo "$ORG" | sed 's/\./-/g' | sed 's/[^a-zA-Z0-9_-]/_/g')
+        FORMATTED_REPO=$(echo "$REPO" | sed 's/[^a-zA-Z0-9_-]/_/g')
+        echo "Debug: FORMATTED_ORG=$FORMATTED_ORG, FORMATTED_REPO=$FORMATTED_REPO"
+
+        STACK_NAME="${FORMATTED_ORG}__${FORMATTED_REPO}"
+        echo "Debug: STACK_NAME=$STACK_NAME"
+
+        echo "name=$STACK_NAME" >> $GITHUB_OUTPUT
+        echo "org=$FORMATTED_ORG" >> $GITHUB_OUTPUT
+        echo "repo=$FORMATTED_REPO" >> $GITHUB_OUTPUT