diff --git a/cmd/picoclaw/internal/auth/status_test.go b/cmd/picoclaw/internal/auth/status_test.go
index 7748ba502..2f9a70721 100644
--- a/cmd/picoclaw/internal/auth/status_test.go
+++ b/cmd/picoclaw/internal/auth/status_test.go
@@ -1,12 +1,53 @@
 package auth
 
 import (
+	"bytes"
+	"encoding/json"
+	"io"
+	"os"
+	"path/filepath"
+	"strings"
 	"testing"
+	"time"
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
+
+	pkgauth "github.com/sipeed/picoclaw/pkg/auth"
+	"github.com/sipeed/picoclaw/pkg/config"
 )
 
+func captureAuthStdout(t *testing.T, fn func()) string {
+	t.Helper()
+
+	oldStdout := os.Stdout
+	r, w, err := os.Pipe()
+	require.NoError(t, err)
+	os.Stdout = w
+	t.Cleanup(func() {
+		os.Stdout = oldStdout
+	})
+
+	fn()
+
+	require.NoError(t, w.Close())
+	os.Stdout = oldStdout
+
+	var buf bytes.Buffer
+	_, err = io.Copy(&buf, r)
+	require.NoError(t, err)
+	require.NoError(t, r.Close())
+	return buf.String()
+}
+
+func setAuthStatusTestHome(t *testing.T) string {
+	t.Helper()
+
+	tmpDir := t.TempDir()
+	t.Setenv(config.EnvHome, filepath.Join(tmpDir, ".picoclaw"))
+	return tmpDir
+}
+
 func TestNewStatusSubcommand(t *testing.T) {
 	cmd := newStatusCommand()
 
@@ -16,3 +57,47 @@ func TestNewStatusSubcommand(t *testing.T) {
 
 	assert.False(t, cmd.HasFlags())
 }
+
+func TestAuthStatusCmdShowsCanonicalGoogleAntigravityAfterLegacyRefresh(t *testing.T) {
+	tmpDir := setAuthStatusTestHome(t)
+
+	legacyExpiry := time.Date(2026, 4, 16, 10, 0, 0, 0, time.UTC)
+	legacyStore := map[string]any{
+		"credentials": map[string]any{
+			"antigravity": map[string]any{
+				"access_token": "legacy-token",
+				"expires_at":   legacyExpiry.Format(time.RFC3339),
+				"provider":     "antigravity",
+				"auth_method":  "oauth",
+				"project_id":   "legacy-project",
+			},
+		},
+	}
+	data, err := json.Marshal(legacyStore)
+	require.NoError(t, err)
+
+	authPath := filepath.Join(tmpDir, ".picoclaw", "auth.json")
+	require.NoError(t, os.MkdirAll(filepath.Dir(authPath), 0o755))
+	require.NoError(t, os.WriteFile(authPath, data, 0o600))
+
+	refreshedExpiry := time.Date(2026, 4, 16, 12, 30, 0, 0, time.UTC)
+	err = pkgauth.SetCredential("google-antigravity", &pkgauth.AuthCredential{
+		AccessToken: "fresh-token",
+		ExpiresAt:   refreshedExpiry,
+		Provider:    "google-antigravity",
+		AuthMethod:  "oauth",
+		ProjectID:   "fresh-project",
+	})
+	require.NoError(t, err)
+
+	output := captureAuthStdout(t, func() {
+		require.NoError(t, authStatusCmd())
+	})
+
+	assert.Contains(t, output, "\nAuthenticated Providers:")
+	assert.Contains(t, output, "\n  google-antigravity:\n")
+	assert.NotContains(t, output, "\n  antigravity:\n")
+	assert.Contains(t, output, "    Project: fresh-project")
+	assert.Contains(t, output, "    Expires: 2026-04-16 12:30")
+	assert.Equal(t, 1, strings.Count(output, ":\n    Method: oauth"))
+}
diff --git a/pkg/auth/store.go b/pkg/auth/store.go
index dfea11df4..0e6567a03 100644
--- a/pkg/auth/store.go
+++ b/pkg/auth/store.go
@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"os"
 	"path/filepath"
+	"strings"
 	"time"
 
 	"github.com/sipeed/picoclaw/pkg/config"
@@ -25,6 +26,11 @@ type AuthStore struct {
 	Credentials map[string]*AuthCredential `json:"credentials"`
 }
 
+const (
+	providerGoogleAntigravity = "google-antigravity"
+	providerAntigravityAlias  = "antigravity"
+)
+
 func (c *AuthCredential) IsExpired() bool {
 	if c.ExpiresAt.IsZero() {
 		return false
@@ -43,6 +49,125 @@ func authFilePath() string {
 	return filepath.Join(config.GetHome(), "auth.json")
 }
 
+func canonicalProvider(provider string) string {
+	normalized := strings.ToLower(strings.TrimSpace(provider))
+	switch normalized {
+	case providerAntigravityAlias:
+		return providerGoogleAntigravity
+	default:
+		return normalized
+	}
+}
+
+func cloneCredential(cred *AuthCredential) *AuthCredential {
+	if cred == nil {
+		return nil
+	}
+	cp := *cred
+	return &cp
+}
+
+func mergeCredentials(primary, secondary *AuthCredential) *AuthCredential {
+	if primary == nil {
+		return cloneCredential(secondary)
+	}
+
+	merged := *primary
+	if secondary == nil {
+		return &merged
+	}
+	if merged.AccessToken == "" {
+		merged.AccessToken = secondary.AccessToken
+	}
+	if merged.RefreshToken == "" {
+		merged.RefreshToken = secondary.RefreshToken
+	}
+	if merged.AccountID == "" {
+		merged.AccountID = secondary.AccountID
+	}
+	if merged.ExpiresAt.IsZero() {
+		merged.ExpiresAt = secondary.ExpiresAt
+	}
+	if merged.Provider == "" {
+		merged.Provider = secondary.Provider
+	}
+	if merged.AuthMethod == "" {
+		merged.AuthMethod = secondary.AuthMethod
+	}
+	if merged.Email == "" {
+		merged.Email = secondary.Email
+	}
+	if merged.ProjectID == "" {
+		merged.ProjectID = secondary.ProjectID
+	}
+
+	return &merged
+}
+
+func shouldPreferCredential(
+	candidate *AuthCredential,
+	candidateCanonical bool,
+	current *AuthCredential,
+	currentCanonical bool,
+) bool {
+	if candidate == nil {
+		return false
+	}
+	if current == nil {
+		return true
+	}
+
+	switch {
+	case candidate.ExpiresAt.After(current.ExpiresAt):
+		return true
+	case current.ExpiresAt.After(candidate.ExpiresAt):
+		return false
+	case candidateCanonical != currentCanonical:
+		return candidateCanonical
+	default:
+		return false
+	}
+}
+
+func normalizeStore(store *AuthStore) {
+	if store == nil {
+		return
+	}
+	if store.Credentials == nil {
+		store.Credentials = make(map[string]*AuthCredential)
+		return
+	}
+
+	normalized := make(map[string]*AuthCredential, len(store.Credentials))
+	canonicalFlags := make(map[string]bool, len(store.Credentials))
+
+	for provider, cred := range store.Credentials {
+		normalizedProvider := strings.ToLower(strings.TrimSpace(provider))
+		canonical := canonicalProvider(provider)
+		normalizedCred := cloneCredential(cred)
+		if normalizedCred != nil {
+			normalizedCred.Provider = canonicalProvider(normalizedCred.Provider)
+			if normalizedCred.Provider == "" {
+				normalizedCred.Provider = canonical
+			}
+		}
+
+		current := normalized[canonical]
+		currentCanonical := canonicalFlags[canonical]
+		candidateCanonical := normalizedProvider == canonical
+
+		if shouldPreferCredential(normalizedCred, candidateCanonical, current, currentCanonical) {
+			normalized[canonical] = mergeCredentials(normalizedCred, current)
+			canonicalFlags[canonical] = candidateCanonical
+			continue
+		}
+
+		normalized[canonical] = mergeCredentials(current, normalizedCred)
+	}
+
+	store.Credentials = normalized
+}
+
 func LoadStore() (*AuthStore, error) {
 	path := authFilePath()
 	data, err := os.ReadFile(path)
@@ -57,9 +182,7 @@ func LoadStore() (*AuthStore, error) {
 	if err := json.Unmarshal(data, &store); err != nil {
 		return nil, err
 	}
-	if store.Credentials == nil {
-		store.Credentials = make(map[string]*AuthCredential)
-	}
+	normalizeStore(&store)
 	return &store, nil
 }
 
@@ -79,7 +202,7 @@ func GetCredential(provider string) (*AuthCredential, error) {
 	if err != nil {
 		return nil, err
 	}
-	cred, ok := store.Credentials[provider]
+	cred, ok := store.Credentials[canonicalProvider(provider)]
 	if !ok {
 		return nil, nil
 	}
@@ -91,7 +214,17 @@ func SetCredential(provider string, cred *AuthCredential) error {
 	if err != nil {
 		return err
 	}
-	store.Credentials[provider] = cred
+
+	canonical := canonicalProvider(provider)
+	normalized := cloneCredential(cred)
+	if normalized != nil {
+		normalized.Provider = canonicalProvider(normalized.Provider)
+		if normalized.Provider == "" {
+			normalized.Provider = canonical
+		}
+	}
+
+	store.Credentials[canonical] = normalized
 	return SaveStore(store)
 }
 
@@ -100,7 +233,7 @@ func DeleteCredential(provider string) error {
 	if err != nil {
 		return err
 	}
-	delete(store.Credentials, provider)
+	delete(store.Credentials, canonicalProvider(provider))
 	return SaveStore(store)
 }
 
diff --git a/pkg/auth/store_test.go b/pkg/auth/store_test.go
index f6793cfce..578ed4ead 100644
--- a/pkg/auth/store_test.go
+++ b/pkg/auth/store_test.go
@@ -1,12 +1,24 @@
 package auth
 
 import (
+	"encoding/json"
 	"os"
 	"path/filepath"
+	"runtime"
 	"testing"
 	"time"
+
+	"github.com/sipeed/picoclaw/pkg/config"
 )
 
+func setTestAuthHome(t *testing.T) string {
+	t.Helper()
+
+	tmpDir := t.TempDir()
+	t.Setenv(config.EnvHome, filepath.Join(tmpDir, ".picoclaw"))
+	return tmpDir
+}
+
 func TestAuthCredentialIsExpired(t *testing.T) {
 	tests := []struct {
 		name      string
@@ -51,10 +63,7 @@ func TestAuthCredentialNeedsRefresh(t *testing.T) {
 }
 
 func TestStoreRoundtrip(t *testing.T) {
-	tmpDir := t.TempDir()
-	origHome := os.Getenv("HOME")
-	t.Setenv("HOME", tmpDir)
-	defer os.Setenv("HOME", origHome)
+	setTestAuthHome(t)
 
 	cred := &AuthCredential{
 		AccessToken:  "test-access-token",
@@ -88,10 +97,7 @@ func TestStoreRoundtrip(t *testing.T) {
 }
 
 func TestStoreFilePermissions(t *testing.T) {
-	tmpDir := t.TempDir()
-	origHome := os.Getenv("HOME")
-	t.Setenv("HOME", tmpDir)
-	defer os.Setenv("HOME", origHome)
+	tmpDir := setTestAuthHome(t)
 
 	cred := &AuthCredential{
 		AccessToken: "secret-token",
@@ -108,16 +114,16 @@ func TestStoreFilePermissions(t *testing.T) {
 		t.Fatalf("Stat() error: %v", err)
 	}
 	perm := info.Mode().Perm()
+	if runtime.GOOS == "windows" {
+		return
+	}
 	if perm != 0o600 {
 		t.Errorf("file permissions = %o, want 0600", perm)
 	}
 }
 
 func TestStoreMultiProvider(t *testing.T) {
-	tmpDir := t.TempDir()
-	origHome := os.Getenv("HOME")
-	t.Setenv("HOME", tmpDir)
-	defer os.Setenv("HOME", origHome)
+	setTestAuthHome(t)
 
 	openaiCred := &AuthCredential{AccessToken: "openai-token", Provider: "openai", AuthMethod: "oauth"}
 	anthropicCred := &AuthCredential{AccessToken: "anthropic-token", Provider: "anthropic", AuthMethod: "token"}
@@ -147,10 +153,7 @@ func TestStoreMultiProvider(t *testing.T) {
 }
 
 func TestDeleteCredential(t *testing.T) {
-	tmpDir := t.TempDir()
-	origHome := os.Getenv("HOME")
-	t.Setenv("HOME", tmpDir)
-	defer os.Setenv("HOME", origHome)
+	setTestAuthHome(t)
 
 	cred := &AuthCredential{AccessToken: "to-delete", Provider: "openai", AuthMethod: "oauth"}
 	if err := SetCredential("openai", cred); err != nil {
@@ -171,10 +174,7 @@ func TestDeleteCredential(t *testing.T) {
 }
 
 func TestLoadStoreEmpty(t *testing.T) {
-	tmpDir := t.TempDir()
-	origHome := os.Getenv("HOME")
-	t.Setenv("HOME", tmpDir)
-	defer os.Setenv("HOME", origHome)
+	setTestAuthHome(t)
 
 	store, err := LoadStore()
 	if err != nil {
@@ -187,3 +187,319 @@ func TestLoadStoreEmpty(t *testing.T) {
 		t.Errorf("expected empty credentials, got %d", len(store.Credentials))
 	}
 }
+
+func TestGetCredentialCanonicalizesLegacyAntigravityProvider(t *testing.T) {
+	tmpDir := setTestAuthHome(t)
+
+	expiresAt := time.Date(2026, 4, 16, 10, 0, 0, 0, time.UTC)
+	store := map[string]any{
+		"credentials": map[string]any{
+			"antigravity": map[string]any{
+				"access_token": "legacy-token",
+				"expires_at":   expiresAt.Format(time.RFC3339),
+				"provider":     "antigravity",
+				"auth_method":  "oauth",
+				"project_id":   "project-1",
+			},
+		},
+	}
+	data, err := json.Marshal(store)
+	if err != nil {
+		t.Fatalf("json.Marshal() error: %v", err)
+	}
+	path := filepath.Join(tmpDir, ".picoclaw", "auth.json")
+	err = os.MkdirAll(filepath.Dir(path), 0o755)
+	if err != nil {
+		t.Fatalf("MkdirAll() error: %v", err)
+	}
+	err = os.WriteFile(path, data, 0o600)
+	if err != nil {
+		t.Fatalf("WriteFile() error: %v", err)
+	}
+
+	cred, err := GetCredential("google-antigravity")
+	if err != nil {
+		t.Fatalf("GetCredential() error: %v", err)
+	}
+	if cred == nil {
+		t.Fatal("GetCredential() returned nil")
+	}
+	if cred.Provider != "google-antigravity" {
+		t.Fatalf("Provider = %q, want %q", cred.Provider, "google-antigravity")
+	}
+	if !cred.ExpiresAt.Equal(expiresAt) {
+		t.Fatalf("ExpiresAt = %v, want %v", cred.ExpiresAt, expiresAt)
+	}
+}
+
+func TestLoadStoreMergesAntigravityAliasesPreferringNewerExpiry(t *testing.T) {
+	tmpDir := setTestAuthHome(t)
+
+	legacyExpiry := time.Date(2026, 4, 16, 10, 0, 0, 0, time.UTC)
+	refreshedExpiry := time.Date(2026, 4, 16, 12, 0, 0, 0, time.UTC)
+	store := map[string]any{
+		"credentials": map[string]any{
+			"antigravity": map[string]any{
+				"access_token":  "legacy-token",
+				"refresh_token": "legacy-refresh",
+				"expires_at":    legacyExpiry.Format(time.RFC3339),
+				"provider":      "antigravity",
+				"auth_method":   "oauth",
+				"email":         "legacy@example.com",
+			},
+			"google-antigravity": map[string]any{
+				"access_token": "fresh-token",
+				"expires_at":   refreshedExpiry.Format(time.RFC3339),
+				"provider":     "google-antigravity",
+				"auth_method":  "oauth",
+				"project_id":   "project-2",
+			},
+		},
+	}
+	data, err := json.Marshal(store)
+	if err != nil {
+		t.Fatalf("json.Marshal() error: %v", err)
+	}
+	path := filepath.Join(tmpDir, ".picoclaw", "auth.json")
+	err = os.MkdirAll(filepath.Dir(path), 0o755)
+	if err != nil {
+		t.Fatalf("MkdirAll() error: %v", err)
+	}
+	err = os.WriteFile(path, data, 0o600)
+	if err != nil {
+		t.Fatalf("WriteFile() error: %v", err)
+	}
+
+	loaded, err := LoadStore()
+	if err != nil {
+		t.Fatalf("LoadStore() error: %v", err)
+	}
+	if len(loaded.Credentials) != 1 {
+		t.Fatalf("credential count = %d, want 1", len(loaded.Credentials))
+	}
+
+	cred := loaded.Credentials["google-antigravity"]
+	if cred == nil {
+		t.Fatal("google-antigravity credential missing")
+	}
+	if cred.AccessToken != "fresh-token" {
+		t.Fatalf("AccessToken = %q, want %q", cred.AccessToken, "fresh-token")
+	}
+	if cred.RefreshToken != "legacy-refresh" {
+		t.Fatalf("RefreshToken = %q, want %q", cred.RefreshToken, "legacy-refresh")
+	}
+	if cred.Email != "legacy@example.com" {
+		t.Fatalf("Email = %q, want %q", cred.Email, "legacy@example.com")
+	}
+	if cred.ProjectID != "project-2" {
+		t.Fatalf("ProjectID = %q, want %q", cred.ProjectID, "project-2")
+	}
+	if !cred.ExpiresAt.Equal(refreshedExpiry) {
+		t.Fatalf("ExpiresAt = %v, want %v", cred.ExpiresAt, refreshedExpiry)
+	}
+}
+
+func TestLoadStorePrefersCanonicalKeyWhenExpiryMatchesAlias(t *testing.T) {
+	tmpDir := setTestAuthHome(t)
+
+	expiresAt := time.Date(2026, 4, 16, 12, 0, 0, 0, time.UTC)
+	store := map[string]any{
+		"credentials": map[string]any{
+			"antigravity": map[string]any{
+				"access_token":  "legacy-token",
+				"refresh_token": "legacy-refresh",
+				"expires_at":    expiresAt.Format(time.RFC3339),
+				"provider":      "antigravity",
+				"auth_method":   "oauth",
+				"email":         "legacy@example.com",
+			},
+			" Google-Antigravity ": map[string]any{
+				"access_token": "fresh-token",
+				"expires_at":   expiresAt.Format(time.RFC3339),
+				"provider":     " Google-Antigravity ",
+				"auth_method":  "oauth",
+				"project_id":   "project-2",
+			},
+		},
+	}
+	data, err := json.Marshal(store)
+	if err != nil {
+		t.Fatalf("json.Marshal() error: %v", err)
+	}
+	path := filepath.Join(tmpDir, ".picoclaw", "auth.json")
+	err = os.MkdirAll(filepath.Dir(path), 0o755)
+	if err != nil {
+		t.Fatalf("MkdirAll() error: %v", err)
+	}
+	err = os.WriteFile(path, data, 0o600)
+	if err != nil {
+		t.Fatalf("WriteFile() error: %v", err)
+	}
+
+	loaded, err := LoadStore()
+	if err != nil {
+		t.Fatalf("LoadStore() error: %v", err)
+	}
+	if len(loaded.Credentials) != 1 {
+		t.Fatalf("credential count = %d, want 1", len(loaded.Credentials))
+	}
+
+	cred := loaded.Credentials["google-antigravity"]
+	if cred == nil {
+		t.Fatal("google-antigravity credential missing")
+	}
+	if cred.AccessToken != "fresh-token" {
+		t.Fatalf("AccessToken = %q, want %q", cred.AccessToken, "fresh-token")
+	}
+	if cred.RefreshToken != "legacy-refresh" {
+		t.Fatalf("RefreshToken = %q, want %q", cred.RefreshToken, "legacy-refresh")
+	}
+	if cred.Email != "legacy@example.com" {
+		t.Fatalf("Email = %q, want %q", cred.Email, "legacy@example.com")
+	}
+	if cred.ProjectID != "project-2" {
+		t.Fatalf("ProjectID = %q, want %q", cred.ProjectID, "project-2")
+	}
+}
+
+func TestSetCredentialReplacesLegacyAntigravityEntry(t *testing.T) {
+	tmpDir := setTestAuthHome(t)
+
+	legacyStore := map[string]any{
+		"credentials": map[string]any{
+			"antigravity": map[string]any{
+				"access_token": "legacy-token",
+				"expires_at":   time.Date(2026, 4, 16, 10, 0, 0, 0, time.UTC).Format(time.RFC3339),
+				"provider":     "antigravity",
+				"auth_method":  "oauth",
+			},
+		},
+	}
+	data, err := json.Marshal(legacyStore)
+	if err != nil {
+		t.Fatalf("json.Marshal() error: %v", err)
+	}
+	path := filepath.Join(tmpDir, ".picoclaw", "auth.json")
+	err = os.MkdirAll(filepath.Dir(path), 0o755)
+	if err != nil {
+		t.Fatalf("MkdirAll() error: %v", err)
+	}
+	err = os.WriteFile(path, data, 0o600)
+	if err != nil {
+		t.Fatalf("WriteFile() error: %v", err)
+	}
+
+	refreshedExpiry := time.Date(2026, 4, 16, 12, 30, 0, 0, time.UTC)
+	err = SetCredential("google-antigravity", &AuthCredential{
+		AccessToken: "fresh-token",
+		ExpiresAt:   refreshedExpiry,
+		Provider:    "google-antigravity",
+		AuthMethod:  "oauth",
+	})
+	if err != nil {
+		t.Fatalf("SetCredential() error: %v", err)
+	}
+
+	loaded, err := LoadStore()
+	if err != nil {
+		t.Fatalf("LoadStore() error: %v", err)
+	}
+	if len(loaded.Credentials) != 1 {
+		t.Fatalf("credential count = %d, want 1", len(loaded.Credentials))
+	}
+
+	cred := loaded.Credentials["google-antigravity"]
+	if cred == nil {
+		t.Fatal("google-antigravity credential missing")
+	}
+	if cred.AccessToken != "fresh-token" {
+		t.Fatalf("AccessToken = %q, want %q", cred.AccessToken, "fresh-token")
+	}
+	if !cred.ExpiresAt.Equal(refreshedExpiry) {
+		t.Fatalf("ExpiresAt = %v, want %v", cred.ExpiresAt, refreshedExpiry)
+	}
+}
+
+func TestDeleteCredentialRemovesLegacyAntigravityAlias(t *testing.T) {
+	tmpDir := setTestAuthHome(t)
+
+	legacyStore := map[string]any{
+		"credentials": map[string]any{
+			"antigravity": map[string]any{
+				"access_token": "legacy-token",
+				"provider":     "antigravity",
+				"auth_method":  "oauth",
+			},
+		},
+	}
+	data, err := json.Marshal(legacyStore)
+	if err != nil {
+		t.Fatalf("json.Marshal() error: %v", err)
+	}
+	path := filepath.Join(tmpDir, ".picoclaw", "auth.json")
+	err = os.MkdirAll(filepath.Dir(path), 0o755)
+	if err != nil {
+		t.Fatalf("MkdirAll() error: %v", err)
+	}
+	err = os.WriteFile(path, data, 0o600)
+	if err != nil {
+		t.Fatalf("WriteFile() error: %v", err)
+	}
+
+	err = DeleteCredential(" google-antigravity ")
+	if err != nil {
+		t.Fatalf("DeleteCredential() error: %v", err)
+	}
+
+	loaded, err := LoadStore()
+	if err != nil {
+		t.Fatalf("LoadStore() error: %v", err)
+	}
+	if len(loaded.Credentials) != 0 {
+		t.Fatalf("credential count = %d, want 0", len(loaded.Credentials))
+	}
+}
+
+func TestSetCredentialCanonicalizesTrimmedMixedCaseProvider(t *testing.T) {
+	setTestAuthHome(t)
+
+	expiresAt := time.Date(2026, 4, 16, 13, 0, 0, 0, time.UTC)
+	if err := SetCredential("  AnTiGrAvItY  ", &AuthCredential{
+		AccessToken: "fresh-token",
+		ExpiresAt:   expiresAt,
+		Provider:    "  AnTiGrAvItY  ",
+		AuthMethod:  "oauth",
+	}); err != nil {
+		t.Fatalf("SetCredential() error: %v", err)
+	}
+
+	loaded, err := LoadStore()
+	if err != nil {
+		t.Fatalf("LoadStore() error: %v", err)
+	}
+	if len(loaded.Credentials) != 1 {
+		t.Fatalf("credential count = %d, want 1", len(loaded.Credentials))
+	}
+
+	cred := loaded.Credentials["google-antigravity"]
+	if cred == nil {
+		t.Fatal("google-antigravity credential missing")
+	}
+	if cred.Provider != "google-antigravity" {
+		t.Fatalf("Provider = %q, want %q", cred.Provider, "google-antigravity")
+	}
+	if !cred.ExpiresAt.Equal(expiresAt) {
+		t.Fatalf("ExpiresAt = %v, want %v", cred.ExpiresAt, expiresAt)
+	}
+
+	got, err := GetCredential("  GoOgLe-AnTiGrAvItY ")
+	if err != nil {
+		t.Fatalf("GetCredential() error: %v", err)
+	}
+	if got == nil {
+		t.Fatal("GetCredential() returned nil")
+	}
+	if got.Provider != "google-antigravity" {
+		t.Fatalf("GetCredential provider = %q, want %q", got.Provider, "google-antigravity")
+	}
+}