diff --git a/README.md b/README.md
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+# ComfyUI-EnvVariable
+
+Minimal ComfyUI custom node that reads an environment variable by key and outputs it as a string.
+
+## Node
+
+- Name: `Environment Variable`
+- Input: `key` (STRING)
+- Output: `value` (STRING)
+
+At runtime, the node returns the value of `os.environ[key]` if it exists, otherwise an empty string.
diff --git a/__init__.py b/__init__.py
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+from .env_variable_node import EnvVariableNode
+
+NODE_CLASS_MAPPINGS = {
+    "EnvVariable": EnvVariableNode,
+}
+
+NODE_DISPLAY_NAME_MAPPINGS = {
+    "EnvVariable": "Environment Variable",
+}
diff --git a/env_variable_node.py b/env_variable_node.py
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+++ b/env_variable_node.py
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+class EnvVariableNode:
+    @classmethod
+    def INPUT_TYPES(cls):
+        return {
+            "required": {
+                "key": (
+                    "STRING",
+                    {
+                        "default": "OPENAI_API_KEY",
+                        "multiline": False,
+                    },
+                ),
+            }
+        }
+
+    RETURN_TYPES = ("STRING",)
+    RETURN_NAMES = ("value",)
+    FUNCTION = "get_value"
+    CATEGORY = "utils"
+
+    def get_value(self, key):
+        import os
+
+        return (os.environ.get(key, ""),)