fix(mistral): error message handling (#283)

Author: laundy

Diff for: src/Providers/Mistral/Concerns/ValidatesResponse.php

@@ -24,11 +24,13 @@ protected function validateResponse(Response $response): void
         $data = $response->json();
 
         if (! $data || data_get($data, 'object') === 'error') {
+            $message = data_get($data, 'message', 'unknown');
+
             throw PrismException::providerResponseError(vsprintf(
                 'Mistral Error: [%s] %s',
                 [
                     data_get($data, 'type', 'unknown'),
-                    data_get($data, 'message', 'unknown'),
+                    is_array($message) ? json_encode($message) : $message,
                 ]
             ));
         }

Diff for: src/Providers/Mistral/Handlers/Text.php

@@ -132,15 +132,19 @@ protected function addStep(array $data, Request $request, ClientResponse $client
     protected function sendRequest(Request $request): ClientResponse
     {
         try {
-            return $this->client->post('chat/completions', [
-                'model' => $request->model(),
-                'messages' => (new MessageMap($request->messages(), $request->systemPrompts()))(),
-                'tools' => ToolMap::map($request->tools()),
-                'temperature' => $request->temperature(),
-                'max_tokens' => $request->maxTokens(),
-                'top_p' => $request->topP(),
-                'tool_choice' => ToolChoiceMap::map($request->toolChoice()),
-            ]);
+            return $this->client->post(
+                'chat/completions',
+                array_merge([
+                    'model' => $request->model(),
+                    'messages' => (new MessageMap($request->messages(), $request->systemPrompts()))(),
+                    'max_tokens' => $request->maxTokens(),
+                ], array_filter([
+                    'temperature' => $request->temperature(),
+                    'top_p' => $request->topP(),
+                    'tools' => ToolMap::map($request->tools()),
+                    'tool_choice' => ToolChoiceMap::map($request->toolChoice()),
+                ]))
+            );
         } catch (Throwable $e) {
             throw PrismException::providerRequestError($request->model(), $e);
         }