Use isawaitable instead of iscoroutine

src/fastmcp/prompts/prompt.py

@@ -329,7 +329,7 @@ class FunctionPrompt(Prompt):
 
             # Call function and check if result is a coroutine
             result = self.fn(**kwargs)
-            if inspect.iscoroutine(result):
+            if inspect.isawaitable(result):
                 result = await result
 
             # Validate messages

src/fastmcp/resources/resource.py

@@ -182,7 +182,7 @@ class FunctionResource(Resource):
             kwargs[context_kwarg] = get_context()
 
         result = self.fn(**kwargs)
-        if inspect.iscoroutinefunction(self.fn):
+        if inspect.isawaitable(result):
             result = await result
 
         if isinstance(result, Resource):

src/fastmcp/resources/template.py

@@ -190,7 +190,7 @@ class FunctionResourceTemplate(ResourceTemplate):
             kwargs[context_kwarg] = get_context()
 
         result = self.fn(**kwargs)
-        if inspect.iscoroutine(result):
+        if inspect.isawaitable(result):
             result = await result
         return result