diff --git a/plugin-schema.json b/plugin-schema.json
new file mode 100644
index 0000000..d9a6804
--- /dev/null
+++ b/plugin-schema.json
@@ -0,0 +1,42 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "type": "object",
+  "required": [
+    "id",
+    "version",
+    "supported_versions",
+    "file",
+    "args"
+  ],
+  "properties": {
+    "id": {
+      "type": "string",
+      "description": "Unique plugin identifier (recommended to be lowercase and use author/plugin format)",
+      "minLength": 1
+    },
+    "version": {
+      "type": "string",
+      "description": "Plugin version",
+      "pattern": "^\\d+\\.\\d+\\.\\d+$"
+    },
+    "supported_versions": {
+      "type": "array",
+      "description": "List of supported host versions",
+      "items": {
+        "type": "string"
+      }
+    },
+    "file": {
+      "type": "string",
+      "description": "Executable or runtime used to launch the plugin"
+    },
+    "args": {
+      "type": "array",
+      "description": "Arguments passed to the executable",
+      "items": {
+        "type": "string"
+      }
+    }
+  },
+  "additionalProperties": false
+}
diff --git a/src/types.rs b/src/types.rs
index f6d7961..a28b3bd 100644
--- a/src/types.rs
+++ b/src/types.rs
@@ -129,6 +129,7 @@ pub mod message {
 
     /// WebSocket wrapper
     #[derive(Debug, Clone, Serialize)]
+    #[serde(tag = "type", content = "params", rename_all = "snake_case")]
     pub enum WsMessage<T: Serialize + for<'de> Deserialize<'de>> {
         Message(T),
         Binary(Vec<u8>),