Merge pull request #2 from vvr3ddy/fix/provider-creation-fallback

fix(providers): add fallback support at provider creation time

pkg/providers/legacy_provider.go

@@ -28,10 +28,20 @@ func CreateProvider(cfg *config.Config) (LLMProvider, string, error) {
 		return nil, "", fmt.Errorf("no providers configured. Please add entries to model_list in your config")
 	}
 
+	// Collect models to try: primary first, then fallbacks
+	modelsToTry := []string{model}
+	modelsToTry = append(modelsToTry, cfg.Agents.Defaults.ModelFallbacks...)
+
+	var lastErr error
+	for i, modelName := range modelsToTry {
 		// Get model config from model_list
-	modelCfg, err := cfg.GetModelConfig(model)
+		modelCfg, err := cfg.GetModelConfig(modelName)
 		if err != nil {
-		return nil, "", fmt.Errorf("model %q not found in model_list: %w", model, err)
+			lastErr = fmt.Errorf("model %q not found in model_list: %w", modelName, err)
+			if i == len(modelsToTry)-1 {
+				return nil, "", lastErr
+			}
+			continue
 		}
 
 		// Inject global workspace if not set in model config
@@ -42,8 +52,22 @@ func CreateProvider(cfg *config.Config) (LLMProvider, string, error) {
 		// Use factory to create provider
 		provider, modelID, err := CreateProviderFromConfig(modelCfg)
 		if err != nil {
-		return nil, "", fmt.Errorf("failed to create provider for model %q: %w", model, err)
+			lastErr = fmt.Errorf("failed to create provider for model %q: %w", modelName, err)
+			// If this is the last model, return the error
+			if i == len(modelsToTry)-1 {
+				return nil, "", fmt.Errorf("all provider creation attempts failed. Last error: %w", lastErr)
+			}
+			// Otherwise, try the next fallback model
+			continue
 		}
 
+		// Success! Return the provider
+		if modelName != model {
+			// Log that we're using a fallback model
 			return provider, modelID, nil
 		}
+		return provider, modelID, nil
+	}
+
+	return nil, "", lastErr
+}