fix: Do not inject tools when models don't support them; detect this conflict before API calls happen

src/config/input.rs

@@ -239,12 +239,17 @@ impl Input {
         patch_messages(&mut messages, model);
         model.guard_max_input_tokens(&messages)?;
         let (temperature, top_p) = (self.role().temperature(), self.role().top_p());
-        let functions = self.config.read().select_functions(self.role());
-        if let Some(vec) = &functions {
-            for def in vec {
-                debug!("Function definition: {:?}", def.name);
+        let functions = if model.supports_function_calling() {
+            let fns = self.config.read().select_functions(self.role());
+            if let Some(vec) = &fns {
+                for def in vec {
+                    debug!("Function definition: {:?}", def.name);
+                }
             }
-        }
+            fns
+        } else {
+            None
+        };
         Ok(ChatCompletionsData {
             messages,
             temperature,