docs: mention save_prefab_stage in resource docs and skill reference

Author: Scriptwonder

Server/src/services/resources/prefab.py

@@ -57,7 +57,7 @@ async def get_prefab_api_docs(_ctx: Context) -> MCPResponse:
         "workflow": [
             "1. Use manage_asset action=search filterType=Prefab to find prefabs",
             "2. Use the asset path to access detailed data via resources below",
-            "3. Use manage_editor action=open_prefab_stage / close_prefab_stage for prefab editing UI transitions"
+            "3. Use manage_editor action=open_prefab_stage / save_prefab_stage / close_prefab_stage for prefab editing UI transitions"
         ],
         "path_encoding": {
             "note": "Prefab paths must be URL-encoded when used in resource URIs",
@@ -80,7 +80,7 @@ async def get_prefab_api_docs(_ctx: Context) -> MCPResponse:
             }
         },
         "related_tools": {
-            "manage_editor": "Open/close prefab stages in the Unity Editor UI",
+            "manage_editor": "Open/save/close prefab stages in the Unity Editor UI",
             "manage_prefabs": "Headless prefab inspection and modification without opening prefab stages",
             "manage_asset": "Search for prefab assets, get asset info",
             "manage_gameobject": "Modify GameObjects in open prefab stage",

unity-mcp-skill/references/tools-reference.md

@@ -708,6 +708,7 @@ manage_editor(action="add_layer", layer_name="Projectiles")
 manage_editor(action="remove_layer", layer_name="OldLayer")
 
 manage_editor(action="open_prefab_stage", prefab_path="Assets/Prefabs/Enemy.prefab")
+manage_editor(action="save_prefab_stage")   # Save changes in the open prefab stage
 manage_editor(action="close_prefab_stage")  # Exit prefab editing mode back to main scene
 
 # Package deployment (no confirmation dialog — designed for LLM-driven iteration)