fix: add missing Anthropic and OpenRouter provider support in config and LSP

- Add Anthropic field merging in config.mergeProviderFields() to properly load AnthropicModel/BaseURL/Temperature from config.toml
- Add anthropic and openrouter cases in lsp.resolveDefaultModel() to prevent fallback to OpenAI defaults
- Update default Anthropic model to valid claude-3-5-sonnet-20240620 (previous 20241022 doesn't exist)
- Update test expectation to match new default model

This fixes the issue where Anthropic provider configuration was ignored, causing LSP to return dummy completions instead of real LLM responses.

Co-authored-by: Cursor <cursoragent@cursor.com>

4 files changed, 15 insertions, 3 deletions

diff --git a/internal/appconfig/config.go b/internal/appconfig/config.go
index b17c5d4..c9af85e 100644
--- a/internal/appconfig/config.go
+++ b/internal/appconfig/config.go
@@ -1112,6 +1112,15 @@ func (a *App) mergeProviderFields(other *App) {
 	if other.CopilotTemperature != nil { // allow explicit 0.0
 		a.CopilotTemperature = other.CopilotTemperature
 	}
+	if s := strings.TrimSpace(other.AnthropicBaseURL); s != "" {
+		a.AnthropicBaseURL = s
+	}
+	if s := strings.TrimSpace(other.AnthropicModel); s != "" {
+		a.AnthropicModel = s
+	}
+	if other.AnthropicTemperature != nil { // allow explicit 0.0
+		a.AnthropicTemperature = other.AnthropicTemperature
+	}
 }
 
 func getConfigPath() (string, error) {
diff --git a/internal/llm/anthropic.go b/internal/llm/anthropic.go
index a6c1454..0d87424 100644
--- a/internal/llm/anthropic.go
+++ b/internal/llm/anthropic.go
@@ -98,7 +98,7 @@ func newAnthropicWithTimeout(baseURL, model, apiKey string, defaultTemp *float64
 		baseURL = "https://api.anthropic.com/v1"
 	}
 	if strings.TrimSpace(model) == "" {
-		model = "claude-3-5-sonnet-20241022"
+		model = "claude-3-5-sonnet-20240620"
 	}
 	if timeoutSec <= 0 {
 		timeoutSec = 30
diff --git a/internal/llm/anthropic_test.go b/internal/llm/anthropic_test.go
index 578b536..ffc5021 100644
--- a/internal/llm/anthropic_test.go
+++ b/internal/llm/anthropic_test.go
@@ -253,7 +253,7 @@ func TestAnthropicClient_DefaultBaseURL(t *testing.T) {
 
 func TestAnthropicClient_DefaultModel_Empty(t *testing.T) {
 	c := newAnthropic("https://api.anthropic.com/v1", "", "test-key", nil).(anthropicClient)
-	if c.defaultModel != "claude-3-5-sonnet-20241022" {
+	if c.defaultModel != "claude-3-5-sonnet-20240620" {
 		t.Fatalf("expected default model, got '%s'", c.defaultModel)
 	}
 }
diff --git a/internal/lsp/handlers_utils.go b/internal/lsp/handlers_utils.go
index 10cc739..6260acd 100644
--- a/internal/lsp/handlers_utils.go
+++ b/internal/lsp/handlers_utils.go
@@ -31,7 +31,6 @@ type requestSpec struct {
 	index         int
 }
 
-
 func (r requestSpec) effectiveModel(defaultModel string) string {
 	if m := strings.TrimSpace(r.entry.Model); m != "" {
 		return m
@@ -113,6 +112,10 @@ func resolveDefaultModel(cfg appconfig.App, provider string) string {
 		return strings.TrimSpace(cfg.OllamaModel)
 	case "copilot":
 		return strings.TrimSpace(cfg.CopilotModel)
+	case "anthropic":
+		return strings.TrimSpace(cfg.AnthropicModel)
+	case "openrouter":
+		return strings.TrimSpace(cfg.OpenRouterModel)
 	default:
 		return strings.TrimSpace(cfg.OpenAIModel)
 	}