diff --git a/config.example.yaml b/config.example.yaml
index 7cfe17c9..3a4cbc66 100644
--- a/config.example.yaml
+++ b/config.example.yaml
@@ -242,6 +242,12 @@ nonstream-keepalive-interval: 0
 # When false (default), only checks R/E prefix + base64 + first byte 0x12.
 # antigravity-signature-bypass-strict: false
 
+# Antigravity provider behavior.
+# antigravity:
+#   sensitive-words:             # optional: words to obfuscate with zero-width characters in system instructions
+#     - "API"
+#     - "proxy"
+
 # Gemini API keys
 # gemini-api-key:
 #   - api-key: "AIzaSy...01" # may be omitted when base-url is set, for example with header-based authentication
diff --git a/docs/management/api.md b/docs/management/api.md
index 01b9fce9..2c71612d 100644
--- a/docs/management/api.md
+++ b/docs/management/api.md
@@ -101,6 +101,10 @@ The table below is extracted from the final Home route registry built by `intern
 | Method | Path |
 | --- | --- |
 | `GET` | `/anthropic-auth-url` |
+| `DELETE` | `/antigravity` |
+| `GET` | `/antigravity` |
+| `PATCH` | `/antigravity` |
+| `PUT` | `/antigravity` |
 | `GET` | `/antigravity-auth-url` |
 | `POST` | `/api-call` |
 | `GET` | `/api-key-usage` |
@@ -367,6 +371,9 @@ Example response:
   },
   "antigravity-signature-cache-enabled": true,
   "antigravity-signature-bypass-strict": false,
+  "antigravity": {
+    "sensitive-words": ["word"]
+  },
   "gemini-api-key": [],
   "interactions-api-key": [],
   "codex-api-key": [],
@@ -558,6 +565,32 @@ Successful writes return:
 { "status": "ok" }
 ```
 
+### `/antigravity` Config Root
+
+`GET /antigravity` returns:
+
+```json
+{
+  "antigravity": {
+    "sensitive-words": ["API", "proxy"]
+  }
+}
+```
+
+`GET /antigravity` returns the persisted `antigravity` provider config root.
+
+`PUT /antigravity` accepts a raw antigravity object, `{ "value": <antigravity> }`, or `{ "antigravity": <antigravity> }`. It replaces the complete `antigravity` root and validates its schema.
+
+`PATCH /antigravity` accepts the same body shapes and applies object merge-patch semantics to the existing `antigravity` root: submitted object fields are merged recursively, `null` removes a field, and arrays are replaced as whole values.
+
+`DELETE /antigravity` removes the root from the config snapshot.
+
+Successful writes return:
+
+```json
+{ "status": "ok" }
+```
+
 ## Nodes, Version, and Certificates
 
 ### GET `/nodes`
@@ -4133,6 +4166,7 @@ These fields are accepted by Home YAML config. `PUT /config.yaml` accepts non-cr
 | `routing.session-affinity-ttl` | string | Session-to-auth binding duration. |
 | `antigravity-signature-cache-enabled` | boolean pointer | Enables Antigravity thinking signature cache validation. |
 | `antigravity-signature-bypass-strict` | boolean pointer | Controls strictness of Antigravity signature bypass. |
+| `antigravity.sensitive-words` | array of string | Words to obfuscate with zero-width characters in system instructions. |
 | `gemini-api-key` | array of `GeminiKey` | Gemini API-key credentials; use provider-key routes. |
 | `interactions-api-key` | array of `GeminiKey` | Native Google Interactions API-key credentials; use provider-key routes. |
 | `codex-api-key` | array of `CodexKey` | Codex API-key credentials; use provider-key routes. |
diff --git a/docs/management/api_CN.md b/docs/management/api_CN.md
index 93e5c1c3..14189da7 100644
--- a/docs/management/api_CN.md
+++ b/docs/management/api_CN.md
@@ -101,6 +101,10 @@ DB-backed handler 通常同时返回机器可读 `error` 和可读 `message`：
 | Method | Path |
 | --- | --- |
 | `GET` | `/anthropic-auth-url` |
+| `DELETE` | `/antigravity` |
+| `GET` | `/antigravity` |
+| `PATCH` | `/antigravity` |
+| `PUT` | `/antigravity` |
 | `GET` | `/antigravity-auth-url` |
 | `POST` | `/api-call` |
 | `GET` | `/api-key-usage` |
@@ -367,6 +371,9 @@ DB-backed handler 通常同时返回机器可读 `error` 和可读 `message`：
   },
   "antigravity-signature-cache-enabled": true,
   "antigravity-signature-bypass-strict": false,
+  "antigravity": {
+    "sensitive-words": ["word"]
+  },
   "gemini-api-key": [],
   "interactions-api-key": [],
   "codex-api-key": [],
@@ -558,6 +565,32 @@ openai-compatibility
 { "status": "ok" }
 ```
 
+### `/antigravity` Config Root
+
+`GET /antigravity` 输出：
+
+```json
+{
+  "antigravity": {
+    "sensitive-words": ["API", "proxy"]
+  }
+}
+```
+
+`GET /antigravity` 返回持久化的 `antigravity` provider config root。
+
+`PUT /antigravity` 接受原始 antigravity object、`{ "value": <antigravity> }` 或 `{ "antigravity": <antigravity> }`。它会替换完整 `antigravity` root，并校验其 schema。
+
+`PATCH /antigravity` 接受相同 body 形态，并对现有 `antigravity` root 应用 object merge-patch 语义：提交的 object 字段会递归合并，`null` 删除字段，array 作为整体替换。
+
+`DELETE /antigravity` 从 config snapshot 删除该 root。
+
+写入成功返回：
+
+```json
+{ "status": "ok" }
+```
+
 ## 节点、版本和证书
 
 ### GET `/nodes`
@@ -4101,6 +4134,7 @@ DELETE query：
 | `routing.session-affinity-ttl` | string | Session-to-auth binding 持续时间。 |
 | `antigravity-signature-cache-enabled` | boolean pointer | 启用 Antigravity thinking signature cache validation。 |
 | `antigravity-signature-bypass-strict` | boolean pointer | 控制 Antigravity signature bypass 严格程度。 |
+| `antigravity.sensitive-words` | array of string | 在 system instructions 中使用零宽字符混淆的敏感词列表。 |
 | `gemini-api-key` | array of `GeminiKey` | Gemini API-key credentials；应使用 provider-key routes。 |
 | `interactions-api-key` | array of `GeminiKey` | 原生 Google Interactions API-key credentials；应使用 provider-key routes。 |
 | `codex-api-key` | array of `CodexKey` | Codex API-key credentials；应使用 provider-key routes。 |
diff --git a/internal/cluster/config_snapshot.go b/internal/cluster/config_snapshot.go
index 08a606f4..643ffc51 100644
--- a/internal/cluster/config_snapshot.go
+++ b/internal/cluster/config_snapshot.go
@@ -196,6 +196,7 @@ func RuntimeConfigFromRoot(root map[string]any) (*appconfig.Config, []byte, erro
 	cfg.SanitizeOpenAICompatibility()
 	cfg.SanitizeOAuthModelAlias()
 	cfg.SanitizePayloadRules()
+	cfg.SanitizeAntigravity()
 	if cfg.Pprof.Addr == "" {
 		cfg.Pprof.Addr = appconfig.DefaultPprofAddr
 	}
diff --git a/internal/cluster/management/config_test.go b/internal/cluster/management/config_test.go
index 5466be0d..ae45f844 100644
--- a/internal/cluster/management/config_test.go
+++ b/internal/cluster/management/config_test.go
@@ -777,3 +777,102 @@ func TestPutPortRejectsOutOfRangeValues(t *testing.T) {
 		t.Fatalf("snapshot port = %s, want 8317", snapshot["port"])
 	}
 }
+
+func TestAntigravityConfigRoutes(t *testing.T) {
+	db, cleanup := openManagementLogTestDB(t)
+	defer cleanup()
+
+	repo := cluster.NewRepository(db)
+	handler := NewHandler(repo, nil, "127.0.0.1", 8327)
+	engine := gin.New()
+	engine.GET("/antigravity", handler.GetConfigRoot("/antigravity"))
+	engine.PUT("/antigravity", handler.PutConfigRoot("/antigravity"))
+	engine.PATCH("/antigravity", handler.PatchConfigRoot("/antigravity"))
+	engine.DELETE("/antigravity", handler.DeleteConfigRoot("/antigravity"))
+	engine.GET("/config", handler.GetConfig)
+	engine.GET("/config.yaml", handler.GetConfigYAML)
+
+	// Initially empty
+	getResp := httptest.NewRecorder()
+	engine.ServeHTTP(getResp, httptest.NewRequest(http.MethodGet, "/antigravity", nil))
+	if getResp.Code != http.StatusOK {
+		t.Fatalf("initial GET /antigravity status = %d", getResp.Code)
+	}
+
+	// PUT /antigravity
+	putPayload := `{
+		"sensitive-words": ["API", "proxy"]
+	}`
+	putReq := httptest.NewRequest(http.MethodPut, "/antigravity", strings.NewReader(putPayload))
+	putReq.Header.Set("Content-Type", "application/json")
+	putResp := httptest.NewRecorder()
+	engine.ServeHTTP(putResp, putReq)
+	if putResp.Code != http.StatusOK {
+		t.Fatalf("PUT /antigravity status = %d, body = %s", putResp.Code, putResp.Body.String())
+	}
+
+	// GET /antigravity
+	getResp2 := httptest.NewRecorder()
+	engine.ServeHTTP(getResp2, httptest.NewRequest(http.MethodGet, "/antigravity", nil))
+	if getResp2.Code != http.StatusOK {
+		t.Fatalf("GET /antigravity status = %d", getResp2.Code)
+	}
+	if !strings.Contains(getResp2.Body.String(), `"API"`) || !strings.Contains(getResp2.Body.String(), `"proxy"`) {
+		t.Fatalf("GET /antigravity body = %s, want API and proxy", getResp2.Body.String())
+	}
+
+	// GET /config
+	configResp := httptest.NewRecorder()
+	engine.ServeHTTP(configResp, httptest.NewRequest(http.MethodGet, "/config", nil))
+	if configResp.Code != http.StatusOK {
+		t.Fatalf("GET /config status = %d", configResp.Code)
+	}
+	if !strings.Contains(configResp.Body.String(), `"antigravity"`) || !strings.Contains(configResp.Body.String(), `"sensitive-words"`) {
+		t.Fatalf("GET /config body = %s, want antigravity object", configResp.Body.String())
+	}
+
+	// GET /config.yaml
+	yamlResp := httptest.NewRecorder()
+	engine.ServeHTTP(yamlResp, httptest.NewRequest(http.MethodGet, "/config.yaml", nil))
+	if yamlResp.Code != http.StatusOK {
+		t.Fatalf("GET /config.yaml status = %d", yamlResp.Code)
+	}
+	if !strings.Contains(yamlResp.Body.String(), "antigravity:") || !strings.Contains(yamlResp.Body.String(), "sensitive-words:") {
+		t.Fatalf("GET /config.yaml body = %s, want antigravity yaml", yamlResp.Body.String())
+	}
+
+	// PATCH /antigravity
+	patchPayload := `{
+		"sensitive-words": ["internal-secret"]
+	}`
+	patchReq := httptest.NewRequest(http.MethodPatch, "/antigravity", strings.NewReader(patchPayload))
+	patchReq.Header.Set("Content-Type", "application/json")
+	patchResp := httptest.NewRecorder()
+	engine.ServeHTTP(patchResp, patchReq)
+	if patchResp.Code != http.StatusOK {
+		t.Fatalf("PATCH /antigravity status = %d, body = %s", patchResp.Code, patchResp.Body.String())
+	}
+
+	getResp3 := httptest.NewRecorder()
+	engine.ServeHTTP(getResp3, httptest.NewRequest(http.MethodGet, "/antigravity", nil))
+	if !strings.Contains(getResp3.Body.String(), "internal-secret") {
+		t.Fatalf("GET /antigravity after PATCH body = %s", getResp3.Body.String())
+	}
+
+	// DELETE /antigravity
+	deleteReq := httptest.NewRequest(http.MethodDelete, "/antigravity", nil)
+	deleteResp := httptest.NewRecorder()
+	engine.ServeHTTP(deleteResp, deleteReq)
+	if deleteResp.Code != http.StatusOK {
+		t.Fatalf("DELETE /antigravity status = %d, body = %s", deleteResp.Code, deleteResp.Body.String())
+	}
+
+	getResp4 := httptest.NewRecorder()
+	engine.ServeHTTP(getResp4, httptest.NewRequest(http.MethodGet, "/antigravity", nil))
+	if getResp4.Code != http.StatusOK {
+		t.Fatalf("GET /antigravity after DELETE status = %d", getResp4.Code)
+	}
+	if strings.Contains(getResp4.Body.String(), "internal-secret") {
+		t.Fatalf("GET /antigravity after DELETE body = %s, expected deleted", getResp4.Body.String())
+	}
+}
diff --git a/internal/config/antigravity_test.go b/internal/config/antigravity_test.go
new file mode 100644
index 00000000..f939691b
--- /dev/null
+++ b/internal/config/antigravity_test.go
@@ -0,0 +1,74 @@
+package config
+
+import (
+	"os"
+	"path/filepath"
+	"reflect"
+	"testing"
+)
+
+func TestParseConfig_AntigravitySensitiveWords(t *testing.T) {
+	configPath := filepath.Join(t.TempDir(), "config.yaml")
+	content := []byte(`
+antigravity:
+  sensitive-words:
+    - " API "
+    - ""
+    - "proxy"
+    - "   "
+`)
+	if errWrite := os.WriteFile(configPath, content, 0o600); errWrite != nil {
+		t.Fatalf("write config file: %v", errWrite)
+	}
+
+	cfg, errLoad := LoadConfigOptional(configPath, false)
+	if errLoad != nil {
+		t.Fatalf("LoadConfigOptional() error = %v", errLoad)
+	}
+
+	want := []string{"API", "proxy"}
+	if !reflect.DeepEqual(cfg.Antigravity.SensitiveWords, want) {
+		t.Fatalf("Antigravity.SensitiveWords = %#v, want %#v", cfg.Antigravity.SensitiveWords, want)
+	}
+}
+
+func TestSanitizeAntigravity(t *testing.T) {
+	tests := []struct {
+		name string
+		in   []string
+		want []string
+	}{
+		{
+			name: "nil slice",
+			in:   nil,
+			want: nil,
+		},
+		{
+			name: "empty slice",
+			in:   []string{},
+			want: []string{},
+		},
+		{
+			name: "trims whitespace and drops empty",
+			in:   []string{"  word1  ", "", "   ", "word2"},
+			want: []string{"word1", "word2"},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			cfg := &Config{
+				Antigravity: AntigravityConfig{
+					SensitiveWords: tt.in,
+				},
+			}
+			cfg.SanitizeAntigravity()
+			if len(tt.want) == 0 && len(cfg.Antigravity.SensitiveWords) == 0 {
+				return
+			}
+			if !reflect.DeepEqual(cfg.Antigravity.SensitiveWords, tt.want) {
+				t.Fatalf("SanitizeAntigravity() = %#v, want %#v", cfg.Antigravity.SensitiveWords, tt.want)
+			}
+		})
+	}
+}
diff --git a/internal/config/config.go b/internal/config/config.go
index 8b5e78b7..42742c63 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -131,6 +131,9 @@ type Config struct {
 
 	AntigravitySignatureBypassStrict *bool `yaml:"antigravity-signature-bypass-strict,omitempty" json:"antigravity-signature-bypass-strict,omitempty"`
 
+	// Antigravity configures provider-wide Antigravity request behavior.
+	Antigravity AntigravityConfig `yaml:"antigravity" json:"antigravity"`
+
 	// GeminiKey defines Gemini API key configurations with optional routing overrides.
 	GeminiKey []GeminiKey `yaml:"gemini-api-key" json:"gemini-api-key"`
 
@@ -199,6 +202,12 @@ type CodexHeaderDefaults struct {
 	BetaFeatures string `yaml:"beta-features" json:"beta-features"`
 }
 
+// AntigravityConfig configures provider-wide Antigravity request behavior.
+type AntigravityConfig struct {
+	// SensitiveWords is a list of words to obfuscate with zero-width characters in system instructions.
+	SensitiveWords []string `yaml:"sensitive-words,omitempty" json:"sensitive-words,omitempty"`
+}
+
 // TLSConfig holds HTTPS server settings.
 type TLSConfig struct {
 	// Enable toggles HTTPS server mode.
@@ -846,6 +855,9 @@ func LoadConfigOptional(configFile string, optional bool) (*Config, error) {
 	// Validate raw payload rules and drop invalid entries.
 	cfg.SanitizePayloadRules()
 
+	// Sanitize Antigravity configuration.
+	cfg.SanitizeAntigravity()
+
 	ForceHomeRuntimeConfig(&cfg)
 
 	// Return the populated configuration struct.
@@ -941,6 +953,21 @@ func (cfg *Config) SanitizeClaudeHeaderDefaults() {
 	cfg.ClaudeHeaderDefaults.Timeout = strings.TrimSpace(cfg.ClaudeHeaderDefaults.Timeout)
 }
 
+// SanitizeAntigravity trims surrounding whitespace and drops empty words from Antigravity sensitive words.
+func (cfg *Config) SanitizeAntigravity() {
+	if cfg == nil || len(cfg.Antigravity.SensitiveWords) == 0 {
+		return
+	}
+	cleaned := make([]string, 0, len(cfg.Antigravity.SensitiveWords))
+	for _, word := range cfg.Antigravity.SensitiveWords {
+		word = strings.TrimSpace(word)
+		if word != "" {
+			cleaned = append(cleaned, word)
+		}
+	}
+	cfg.Antigravity.SensitiveWords = cleaned
+}
+
 // SanitizeOAuthModelAlias normalizes and deduplicates global OAuth model name aliases.
 // It trims whitespace, normalizes channel keys to lower-case, drops empty entries,
 // allows multiple aliases per upstream name, and ensures aliases are unique within each channel.
diff --git a/internal/managementhttp/server.go b/internal/managementhttp/server.go
index 2380edd0..556f5047 100644
--- a/internal/managementhttp/server.go
+++ b/internal/managementhttp/server.go
@@ -348,6 +348,10 @@ func registerClusterManagementRoutes(r *RouteRegistry, handler *clustermanagemen
 	r.Set(http.MethodPut, "/payload", handler.PutConfigRoot("/payload"))
 	r.Set(http.MethodPatch, "/payload", handler.PatchConfigRoot("/payload"))
 	r.Set(http.MethodDelete, "/payload", handler.DeleteConfigRoot("/payload"))
+	r.Set(http.MethodGet, "/antigravity", handler.GetConfigRoot("/antigravity"))
+	r.Set(http.MethodPut, "/antigravity", handler.PutConfigRoot("/antigravity"))
+	r.Set(http.MethodPatch, "/antigravity", handler.PatchConfigRoot("/antigravity"))
+	r.Set(http.MethodDelete, "/antigravity", handler.DeleteConfigRoot("/antigravity"))
 
 	r.Set(http.MethodGet, "/auth-files", handler.ListAuthFiles)
 	r.Set(http.MethodGet, "/auth-files/models", handler.GetAuthFileModels)
diff --git a/internal/watcher/diff/antigravity_diff_test.go b/internal/watcher/diff/antigravity_diff_test.go
new file mode 100644
index 00000000..63bac593
--- /dev/null
+++ b/internal/watcher/diff/antigravity_diff_test.go
@@ -0,0 +1,27 @@
+package diff
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/router-for-me/CLIProxyAPIHome/internal/config"
+)
+
+func TestConfigDiff_AntigravitySensitiveWords(t *testing.T) {
+	oldCfg := &config.Config{
+		Antigravity: config.AntigravityConfig{
+			SensitiveWords: []string{"API"},
+		},
+	}
+	newCfg := &config.Config{
+		Antigravity: config.AntigravityConfig{
+			SensitiveWords: []string{"API", "proxy"},
+		},
+	}
+
+	diff := BuildConfigChangeDetails(oldCfg, newCfg)
+	joined := strings.Join(diff, "; ")
+	if !strings.Contains(joined, "antigravity.sensitive-words: 1 -> 2") {
+		t.Fatalf("BuildConfigChangeDetails() = %q, want antigravity.sensitive-words change", joined)
+	}
+}
diff --git a/internal/watcher/diff/config_diff.go b/internal/watcher/diff/config_diff.go
index 4aff19a1..aad984ef 100644
--- a/internal/watcher/diff/config_diff.go
+++ b/internal/watcher/diff/config_diff.go
@@ -86,6 +86,9 @@ func BuildConfigChangeDetails(oldCfg, newCfg *config.Config) []string {
 	if oldCfg.QuotaExceeded.AntigravityCredits != newCfg.QuotaExceeded.AntigravityCredits {
 		changes = append(changes, fmt.Sprintf("quota-exceeded.antigravity-credits: %t -> %t", oldCfg.QuotaExceeded.AntigravityCredits, newCfg.QuotaExceeded.AntigravityCredits))
 	}
+	if !reflect.DeepEqual(oldCfg.Antigravity.SensitiveWords, newCfg.Antigravity.SensitiveWords) {
+		changes = append(changes, fmt.Sprintf("antigravity.sensitive-words: %d -> %d", len(oldCfg.Antigravity.SensitiveWords), len(newCfg.Antigravity.SensitiveWords)))
+	}
 
 	if oldCfg.Routing.Strategy != newCfg.Routing.Strategy {
 		changes = append(changes, fmt.Sprintf("routing.strategy: %s -> %s", oldCfg.Routing.Strategy, newCfg.Routing.Strategy))