feat: support litellm in legacy provider config

pkg/config/config.go

@@ -399,6 +399,7 @@ type DevicesConfig struct {
 type ProvidersConfig struct {
 	Anthropic     ProviderConfig       `json:"anthropic"`
 	OpenAI        OpenAIProviderConfig `json:"openai"`
+	LiteLLM       ProviderConfig       `json:"litellm"`
 	OpenRouter    ProviderConfig       `json:"openrouter"`
 	Groq          ProviderConfig       `json:"groq"`
 	Zhipu         ProviderConfig       `json:"zhipu"`
@@ -422,6 +423,7 @@ type ProvidersConfig struct {
 func (p ProvidersConfig) IsEmpty() bool {
 	return p.Anthropic.APIKey == "" && p.Anthropic.APIBase == "" &&
 		p.OpenAI.APIKey == "" && p.OpenAI.APIBase == "" &&
+		p.LiteLLM.APIKey == "" && p.LiteLLM.APIBase == "" &&
 		p.OpenRouter.APIKey == "" && p.OpenRouter.APIBase == "" &&
 		p.Groq.APIKey == "" && p.Groq.APIBase == "" &&
 		p.Zhipu.APIKey == "" && p.Zhipu.APIBase == "" &&

pkg/config/migration.go

@@ -88,6 +88,23 @@ func ConvertProvidersToModelList(cfg *Config) []ModelConfig {
 				}, true
 			},
 		},
+		{
+			providerNames: []string{"litellm"},
+			protocol:      "litellm",
+			buildConfig: func(p ProvidersConfig) (ModelConfig, bool) {
+				if p.LiteLLM.APIKey == "" && p.LiteLLM.APIBase == "" {
+					return ModelConfig{}, false
+				}
+				return ModelConfig{
+					ModelName:      "litellm",
+					Model:          "litellm/auto",
+					APIKey:         p.LiteLLM.APIKey,
+					APIBase:        p.LiteLLM.APIBase,
+					Proxy:          p.LiteLLM.Proxy,
+					RequestTimeout: p.LiteLLM.RequestTimeout,
+				}, true
+			},
+		},
 		{
 			providerNames: []string{"openrouter"},
 			protocol:      "openrouter",

pkg/config/migration_test.go

@@ -63,6 +63,33 @@ func TestConvertProvidersToModelList_Anthropic(t *testing.T) {
 	}
 }
 
+func TestConvertProvidersToModelList_LiteLLM(t *testing.T) {
+	cfg := &Config{
+		Providers: ProvidersConfig{
+			LiteLLM: ProviderConfig{
+				APIKey:  "litellm-key",
+				APIBase: "http://localhost:4000/v1",
+			},
+		},
+	}
+
+	result := ConvertProvidersToModelList(cfg)
+
+	if len(result) != 1 {
+		t.Fatalf("len(result) = %d, want 1", len(result))
+	}
+
+	if result[0].ModelName != "litellm" {
+		t.Errorf("ModelName = %q, want %q", result[0].ModelName, "litellm")
+	}
+	if result[0].Model != "litellm/auto" {
+		t.Errorf("Model = %q, want %q", result[0].Model, "litellm/auto")
+	}
+	if result[0].APIBase != "http://localhost:4000/v1" {
+		t.Errorf("APIBase = %q, want %q", result[0].APIBase, "http://localhost:4000/v1")
+	}
+}
+
 func TestConvertProvidersToModelList_Multiple(t *testing.T) {
 	cfg := &Config{
 		Providers: ProvidersConfig{
@@ -115,6 +142,7 @@ func TestConvertProvidersToModelList_AllProviders(t *testing.T) {
 	cfg := &Config{
 		Providers: ProvidersConfig{
 			OpenAI:        OpenAIProviderConfig{ProviderConfig: ProviderConfig{APIKey: "key1"}},
+			LiteLLM:       ProviderConfig{APIKey: "key-litellm", APIBase: "http://localhost:4000/v1"},
 			Anthropic:     ProviderConfig{APIKey: "key2"},
 			OpenRouter:    ProviderConfig{APIKey: "key3"},
 			Groq:          ProviderConfig{APIKey: "key4"},
@@ -137,9 +165,9 @@ func TestConvertProvidersToModelList_AllProviders(t *testing.T) {
 
 	result := ConvertProvidersToModelList(cfg)
 
-	// All 18 providers should be converted
+	// All 19 providers should be converted
-	if len(result) != 18 {
+	if len(result) != 19 {
-		t.Errorf("len(result) = %d, want 18", len(result))
+		t.Errorf("len(result) = %d, want 19", len(result))
 	}
 }
 

pkg/providers/factory.go

@@ -102,6 +102,12 @@ func resolveProviderSelection(cfg *config.Config) (providerSelection, error) {
 					sel.apiBase = "https://openrouter.ai/api/v1"
 				}
 			}
+		case "litellm":
+			if cfg.Providers.LiteLLM.APIKey != "" || cfg.Providers.LiteLLM.APIBase != "" {
+				sel.apiKey = cfg.Providers.LiteLLM.APIKey
+				sel.apiBase = cfg.Providers.LiteLLM.APIBase
+				sel.proxy = cfg.Providers.LiteLLM.Proxy
+			}
 		case "zhipu", "glm":
 			if cfg.Providers.Zhipu.APIKey != "" {
 				sel.apiKey = cfg.Providers.Zhipu.APIKey

pkg/providers/factory_test.go

@@ -17,6 +17,18 @@ func TestResolveProviderSelection(t *testing.T) {
 		wantProxy     string
 		wantErrSubstr string
 	}{
+		{
+			name: "explicit litellm provider uses configured base",
+			setup: func(cfg *config.Config) {
+				cfg.Agents.Defaults.Provider = "litellm"
+				cfg.Providers.LiteLLM.APIKey = "litellm-key"
+				cfg.Providers.LiteLLM.APIBase = "http://localhost:4000/v1"
+				cfg.Providers.LiteLLM.Proxy = "http://127.0.0.1:7890"
+			},
+			wantType:    providerTypeHTTPCompat,
+			wantAPIBase: "http://localhost:4000/v1",
+			wantProxy:   "http://127.0.0.1:7890",
+		},
 		{
 			name: "explicit claude-cli provider routes to cli provider type",
 			setup: func(cfg *config.Config) {