diff --git a/.gitignore b/.gitignore
index e072a02..cf58aeb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -19,6 +19,7 @@ lib64/
 parts/
 sdist/
 var/
+!backend/autometabuilder/workflow/plugins/var/
 wheels/
 share/python-wheels/
 *.egg-info/
diff --git a/backend/autometabuilder/workflow/plugins/var/__init__.py b/backend/autometabuilder/workflow/plugins/var/__init__.py
new file mode 100644
index 0000000..1c1d736
--- /dev/null
+++ b/backend/autometabuilder/workflow/plugins/var/__init__.py
@@ -0,0 +1 @@
+"""Variable management workflow plugins."""
diff --git a/backend/autometabuilder/workflow/plugins/var/var_delete.py b/backend/autometabuilder/workflow/plugins/var/var_delete.py
new file mode 100644
index 0000000..361d20a
--- /dev/null
+++ b/backend/autometabuilder/workflow/plugins/var/var_delete.py
@@ -0,0 +1,15 @@
+"""Workflow plugin: delete variable from workflow store."""
+
+
+def run(runtime, inputs):
+    """Delete variable from workflow store."""
+    key = inputs.get("key")
+    
+    if key is None:
+        return {"result": False, "deleted": False, "error": "key is required"}
+    
+    if key in runtime.store:
+        del runtime.store[key]
+        return {"result": True, "deleted": True}
+    
+    return {"result": False, "deleted": False}
diff --git a/backend/autometabuilder/workflow/plugins/var/var_exists.py b/backend/autometabuilder/workflow/plugins/var/var_exists.py
new file mode 100644
index 0000000..4e0d6ae
--- /dev/null
+++ b/backend/autometabuilder/workflow/plugins/var/var_exists.py
@@ -0,0 +1,13 @@
+"""Workflow plugin: check if variable exists in workflow store."""
+
+
+def run(runtime, inputs):
+    """Check if variable exists in workflow store."""
+    key = inputs.get("key")
+    
+    if key is None:
+        return {"result": False, "error": "key is required"}
+    
+    exists = key in runtime.store
+    
+    return {"result": exists}
diff --git a/backend/autometabuilder/workflow/plugins/var/var_get.py b/backend/autometabuilder/workflow/plugins/var/var_get.py
new file mode 100644
index 0000000..3d40342
--- /dev/null
+++ b/backend/autometabuilder/workflow/plugins/var/var_get.py
@@ -0,0 +1,15 @@
+"""Workflow plugin: get variable from workflow store."""
+
+
+def run(runtime, inputs):
+    """Get variable value from workflow store."""
+    key = inputs.get("key")
+    default = inputs.get("default")
+    
+    if key is None:
+        return {"result": default, "exists": False, "error": "key is required"}
+    
+    exists = key in runtime.store
+    value = runtime.store.get(key, default)
+    
+    return {"result": value, "exists": exists}
diff --git a/backend/autometabuilder/workflow/plugins/var/var_set.py b/backend/autometabuilder/workflow/plugins/var/var_set.py
new file mode 100644
index 0000000..ec06963
--- /dev/null
+++ b/backend/autometabuilder/workflow/plugins/var/var_set.py
@@ -0,0 +1,14 @@
+"""Workflow plugin: set variable in workflow store."""
+
+
+def run(runtime, inputs):
+    """Set variable value in workflow store."""
+    key = inputs.get("key")
+    value = inputs.get("value")
+    
+    if key is None:
+        return {"result": None, "key": None, "error": "key is required"}
+    
+    runtime.store[key] = value
+    
+    return {"result": value, "key": key}