diff --git a/cmd/picoclaw/internal/auth/helpers.go b/cmd/picoclaw/internal/auth/helpers.go
index e3db7f333..271859128 100644
--- a/cmd/picoclaw/internal/auth/helpers.go
+++ b/cmd/picoclaw/internal/auth/helpers.go
@@ -16,8 +16,11 @@ import (
 	"github.com/sipeed/picoclaw/pkg/providers"
 )
 
-const supportedProvidersMsg = "supported providers: openai, anthropic, google-antigravity"
-const defaultAnthropicModel = "claude-sonnet-4.6"
+const (
+	supportedProvidersMsg = "supported providers: openai, anthropic, google-antigravity"
+	defaultAnthropicModel = "claude-sonnet-4.6"
+)
+
 
 func authLoginCmd(provider string, useDeviceCode bool, useOauth bool) error {
 	switch provider {
diff --git a/cmd/picoclaw/internal/auth/login.go b/cmd/picoclaw/internal/auth/login.go
index 223823489..afbe098aa 100644
--- a/cmd/picoclaw/internal/auth/login.go
+++ b/cmd/picoclaw/internal/auth/login.go
@@ -20,7 +20,10 @@ func newLoginCommand() *cobra.Command {
 
 	cmd.Flags().StringVarP(&provider, "provider", "p", "", "Provider to login with (openai, anthropic)")
 	cmd.Flags().BoolVar(&useDeviceCode, "device-code", false, "Use device code flow (for headless environments)")
-	cmd.Flags().BoolVar(&useOauth, "setup-token", false, "Use setup-token flow for Anthropic (from `claude setup-token`)")
+	cmd.Flags().BoolVar(
+		&useOauth, "setup-token", false,
+		"Use setup-token flow for Anthropic (from `claude setup-token`)",
+	)
 	_ = cmd.MarkFlagRequired("provider")
 
 	return cmd
diff --git a/pkg/auth/anthropic_usage.go b/pkg/auth/anthropic_usage.go
index 3fffc3aa8..716b2908e 100644
--- a/pkg/auth/anthropic_usage.go
+++ b/pkg/auth/anthropic_usage.go
@@ -30,8 +30,8 @@ func FetchAnthropicUsage(token string) (*AnthropicUsage, error) {
 		return nil, err
 	}
 	req.Header.Set("Authorization", "Bearer "+token)
-	req.Header.Set("anthropic-version", anthropicAPIVersion)
-	req.Header.Set("anthropic-beta", anthropicBetaHeader)
+	req.Header.Set("Anthropic-Version", anthropicAPIVersion)
+	req.Header.Set("Anthropic-Beta", anthropicBetaHeader)
 
 	client := &http.Client{Timeout: 10 * time.Second}
 	resp, err := client.Do(req)
diff --git a/pkg/auth/anthropic_usage_test.go b/pkg/auth/anthropic_usage_test.go
index 2c11ac05a..ef4a35364 100644
--- a/pkg/auth/anthropic_usage_test.go
+++ b/pkg/auth/anthropic_usage_test.go
@@ -12,8 +12,8 @@ func TestFetchAnthropicUsage_Success(t *testing.T) {
 		if got := r.Header.Get("Authorization"); got != "Bearer test-token" {
 			t.Errorf("Authorization = %q, want %q", got, "Bearer test-token")
 		}
-		if got := r.Header.Get("anthropic-beta"); got != anthropicBetaHeader {
-			t.Errorf("anthropic-beta = %q, want %q", got, anthropicBetaHeader)
+		if got := r.Header.Get("Anthropic-Beta"); got != anthropicBetaHeader {
+			t.Errorf("Anthropic-Beta = %q, want %q", got, anthropicBetaHeader)
 		}
 		w.WriteHeader(http.StatusOK)
 		w.Write([]byte(`{"five_hour":{"utilization":0.42},"seven_day":{"utilization":0.85}}`))