diff --git a/aider/coders/single_wholefile_func_coder.py b/aider/coders/single_wholefile_func_coder.py
index 87cf9bf41..3c595bac4 100644
--- a/aider/coders/single_wholefile_func_coder.py
+++ b/aider/coders/single_wholefile_func_coder.py
@@ -25,7 +25,7 @@ class SingleWholeFileFunctionCoder(Coder):
                     ),
                     content=dict(
                         type="string",
-                        # description="Content to write to the file",
+                        description="Content to write to the file",
                     ),
                 ),
                 required=["explanation", "content"],
diff --git a/aider/sendchat.py b/aider/sendchat.py
index e45444ef9..1914a618b 100644
--- a/aider/sendchat.py
+++ b/aider/sendchat.py
@@ -59,7 +59,9 @@ def send_completion(
     )
 
     if functions is not None:
-        kwargs["tools"] = [dict(type="function", function=functions[0])]
+        function = functions[0]
+        kwargs["tools"] = [dict(type="function", function=function)]
+        kwargs["tool_choice"] = {"type": "function", "function": {"name": function["name"]}}
     if extra_headers is not None:
         kwargs["extra_headers"] = extra_headers
     if max_tokens is not None: