diff --git a/backend/internal/pkg/antigravity/oauth.go b/backend/internal/pkg/antigravity/oauth.go
index 18310655..afffe9b1 100644
--- a/backend/internal/pkg/antigravity/oauth.go
+++ b/backend/internal/pkg/antigravity/oauth.go
@@ -53,8 +53,7 @@ const (
 var defaultUserAgentVersion = "1.19.6"
 
 // defaultClientSecret 可通过环境变量 ANTIGRAVITY_OAUTH_CLIENT_SECRET 配置
-// 默认值使用占位符，生产环境请通过环境变量注入真实值。
-var defaultClientSecret = "GOCSPX-your-client-secret"
+var defaultClientSecret = "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"
 
 func init() {
 	// 从环境变量读取版本号，未设置则使用默认值
diff --git a/backend/internal/pkg/antigravity/oauth_test.go b/backend/internal/pkg/antigravity/oauth_test.go
index 2a2a52e9..743e2a33 100644
--- a/backend/internal/pkg/antigravity/oauth_test.go
+++ b/backend/internal/pkg/antigravity/oauth_test.go
@@ -684,7 +684,7 @@ func TestConstants_值正确(t *testing.T) {
 	if err != nil {
 		t.Fatalf("getClientSecret 应返回默认值，但报错: %v", err)
 	}
-	if secret != "GOCSPX-your-client-secret" {
+	if secret != "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" {
 		t.Errorf("默认 client_secret 不匹配: got %s", secret)
 	}
 	if RedirectURI != "http://localhost:8085/callback" {
diff --git a/backend/internal/pkg/geminicli/constants.go b/backend/internal/pkg/geminicli/constants.go
index f5ee5735..97234ffd 100644
--- a/backend/internal/pkg/geminicli/constants.go
+++ b/backend/internal/pkg/geminicli/constants.go
@@ -39,7 +39,7 @@ const (
 	// They enable the "login without creating your own OAuth client" experience, but Google may
 	// restrict which scopes are allowed for this client.
 	GeminiCLIOAuthClientID     = "681255809395-oo8ft2oprdrnp9e3aqf6av3hmdib135j.apps.googleusercontent.com"
-	GeminiCLIOAuthClientSecret = "GOCSPX-your-client-secret"
+	GeminiCLIOAuthClientSecret = "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"
 
 	// GeminiCLIOAuthClientSecretEnv is the environment variable name for the built-in client secret.
 	GeminiCLIOAuthClientSecretEnv = "GEMINI_CLI_OAUTH_CLIENT_SECRET"