fix tool description indentation issue #844 https://github.com/jlowin/fastmcp/issues/844

src/fastmcp/prompts/prompt.py

@@ -155,7 +155,7 @@ class FunctionPrompt(Prompt):
             if param.kind == inspect.Parameter.VAR_KEYWORD:
                 raise ValueError("Functions with **kwargs are not supported as prompts")
 
-        description = description or fn.__doc__
+        description = description or inspect.getdoc(fn)
 
         # if the fn is a callable class, we need to get the __call__ method from here out
         if not inspect.isroutine(fn):

src/fastmcp/resources/resource.py

@@ -135,7 +135,7 @@ class FunctionResource(Resource):
             fn=fn,
             uri=uri,
             name=name or fn.__name__,
-            description=description or fn.__doc__,
+            description=description or inspect.getdoc(fn),
             mime_type=mime_type or "text/plain",
             tags=tags or set(),
             enabled=enabled if enabled is not None else True,

src/fastmcp/resources/template.py

@@ -214,7 +214,7 @@ class FunctionResourceTemplate(ResourceTemplate):
                     f"URI parameters {uri_params} must be a subset of the function arguments: {func_params}"
                 )
 
-        description = description or fn.__doc__
+        description = description or inspect.getdoc(fn)
 
         # if the fn is a callable class, we need to get the __call__ method from here out
         if not inspect.isroutine(fn):

src/fastmcp/tools/tool.py

@@ -231,7 +231,7 @@ class ParsedFunction:
 
         # collect name and doc before we potentially modify the function
         fn_name = getattr(fn, "__name__", None) or fn.__class__.__name__
-        fn_doc = fn.__doc__
+        fn_doc = inspect.getdoc(fn)
 
         # if the fn is a callable class, we need to get the __call__ method from here out
         if not inspect.isroutine(fn):