diff --git a/src-tauri/src/live/patch/json.rs b/src-tauri/src/live/patch/json.rs
index 46e0571b..b8ca8531 100644
--- a/src-tauri/src/live/patch/json.rs
+++ b/src-tauri/src/live/patch/json.rs
@@ -35,11 +35,25 @@ pub struct JsonPatch {
     pub seed: Vec<(KeyPath, Value)>,
     /// 当前值等于其中之一才删除（独有字段切走、残留清理）。`set` 里有同一路径时跳过。
     pub remove_if: Vec<(KeyPath, Vec<Value>)>,
+    /// 写前是非空对象、写后变成空对象时删除（被删键留下的空父对象）。写前就为空的不动。
+    pub prune_emptied: Vec<KeyPath>,
 }
 
 impl JsonPatch {
     pub fn apply_to(&self, path: &Path, doc: &mut Value) -> Result<(), LiveWriteError> {
         let targets: HashSet<&KeyPath> = self.set.iter().map(|(key_path, _)| key_path).collect();
+        let mut prune: Vec<&KeyPath> = self
+            .prune_emptied
+            .iter()
+            .filter(|key_path| {
+                !key_path.0.is_empty()
+                    && value_at(doc, key_path)
+                        .and_then(Value::as_object)
+                        .is_some_and(|map| !map.is_empty())
+            })
+            .collect();
+        // 先删深层，父对象才能随之变空。
+        prune.sort_by_key(|key_path| std::cmp::Reverse(key_path.0.len()));
 
         for scope in &self.clear {
             let Some(map) = object_at_mut(path, doc, &scope.parent.0)? else {
@@ -97,6 +111,17 @@ impl JsonPatch {
             }
         }
 
+        for key_path in prune {
+            if value_at(doc, key_path)
+                .is_some_and(|value| value.as_object().is_some_and(Map::is_empty))
+            {
+                let (parent, key) = split(key_path);
+                if let Some(map) = object_at_mut(path, doc, parent)? {
+                    map.shift_remove(key);
+                }
+            }
+        }
+
         Ok(())
     }
 }
@@ -432,6 +457,31 @@ mod tests {
         assert_eq!(value, json!({"env": {"WINDOW": "983616", "BETAS": "0"}}));
     }
 
+    #[test]
+    fn prune_emptied_drops_only_objects_this_write_emptied() {
+        let patch = JsonPatch {
+            remove_if: vec![
+                (
+                    KeyPath::new(&["statusLine", "type"]),
+                    vec![json!("command")],
+                ),
+                (KeyPath::new(&["a", "b", "c"]), vec![json!(1)]),
+                (KeyPath::new(&["kept", "x"]), vec![json!(1)]),
+            ],
+            prune_emptied: vec![
+                KeyPath::new(&["statusLine"]),
+                KeyPath::new(&["a"]),
+                KeyPath::new(&["a", "b"]),
+                KeyPath::new(&["kept"]),
+                KeyPath::new(&["hooks"]),
+            ],
+            ..JsonPatch::default()
+        };
+        let pre = r#"{"hooks":{},"statusLine":{"type":"command"},"a":{"b":{"c":1}},"kept":{"x":1,"y":2}}"#;
+        let out: Value = serde_json::from_str(&apply(&patch, pre)).unwrap();
+        assert_eq!(out, json!({ "hooks": {}, "kept": { "y": 2 } }));
+    }
+
     #[test]
     fn second_write_is_byte_stable() {
         let patch = claude_patch(&[("ANTHROPIC_AUTH_TOKEN", json!("sk-b"))]);
diff --git a/src-tauri/src/services/provider/key_field_live.rs b/src-tauri/src/services/provider/key_field_live.rs
index 49b2c029..75f493e3 100644
--- a/src-tauri/src/services/provider/key_field_live.rs
+++ b/src-tauri/src/services/provider/key_field_live.rs
@@ -123,11 +123,22 @@ pub(super) fn edit_common(
             patch.set.extend(set);
             let mut old = Vec::new();
             entries(&previous, KeyPath::root(), &mut old);
-            patch.remove_if.extend(
-                old.into_iter()
-                    .filter(|(path, _)| global_claude(path))
-                    .map(|(path, value)| (path, vec![value])),
-            );
+            old.retain(|(path, _)| global_claude(path));
+            // Objects that only held removed common keys would otherwise stay
+            // behind as `{}`; objects the new snippet still declares are kept.
+            for (path, _) in &old {
+                for depth in 1..path.0.len() {
+                    let parent = KeyPath(path.0[..depth].to_vec());
+                    if crate::live::patch::json::value_at(&current, &parent).is_none()
+                        && !patch.prune_emptied.contains(&parent)
+                    {
+                        patch.prune_emptied.push(parent);
+                    }
+                }
+            }
+            patch
+                .remove_if
+                .extend(old.into_iter().map(|(path, value)| (path, vec![value])));
         }
         PreparedLiveWrite::Gemini { env, .. } => {
             for (key, value) in current.as_object().unwrap() {
diff --git a/src-tauri/src/services/provider/tests.rs b/src-tauri/src/services/provider/tests.rs
index ad10a6c1..268591cd 100644
--- a/src-tauri/src/services/provider/tests.rs
+++ b/src-tauri/src/services/provider/tests.rs
@@ -5290,6 +5290,158 @@ fn setting_claude_common_snippet_does_not_infer_existing_provider_opt_in() {
     );
 }
 
+const CLAUDE_COMMON_WITH_STATUS_LINE: &str =
+    r#"{"env":{"MY_TEST_KEY":"1"},"statusLine":{"type":"command","command":"/bin/true"}}"#;
+
+fn claude_state_using_common_with_status_line() -> AppState {
+    let provider = with_common_enabled(Provider::with_id(
+        "p1".to_string(),
+        "First".to_string(),
+        json!({
+            "env": {
+                "ANTHROPIC_AUTH_TOKEN": "token1",
+                "ANTHROPIC_BASE_URL": "https://claude.invalid"
+            }
+        }),
+        None,
+    ));
+    let mut config = MultiAppConfig::default();
+    config.ensure_app(&AppType::Claude);
+    config.common_config_snippets.claude = Some(CLAUDE_COMMON_WITH_STATUS_LINE.to_string());
+    {
+        let manager = config
+            .get_manager_mut(&AppType::Claude)
+            .expect("claude manager");
+        manager.current = "p1".to_string();
+        manager.providers.insert("p1".to_string(), provider);
+    }
+    let state = state_from_config(config);
+    state.save().expect("persist config snapshot to db");
+    state
+}
+
+fn assert_status_line_removed_and_user_objects_kept(live: &Value) {
+    assert!(
+        live.get("statusLine").is_none(),
+        "an object emptied by removing common keys should not stay behind: {live}"
+    );
+    assert_eq!(
+        live.get("hooks"),
+        Some(&json!({})),
+        "an empty object the user wrote must be kept"
+    );
+    assert_eq!(
+        live.get("permissions"),
+        Some(&json!({ "allow": ["Bash"] })),
+        "unrelated user settings must be kept"
+    );
+}
+
+#[test]
+#[serial]
+fn shrinking_or_clearing_claude_common_snippet_drops_emptied_parent_objects() {
+    for next in [Some(r#"{"env":{"MY_TEST_KEY":"1"}}"#), None] {
+        let temp_home = TempDir::new().expect("create temp home");
+        let _env = TestEnvGuard::isolated(temp_home.path());
+        std::fs::create_dir_all(crate::config::get_claude_config_dir())
+            .expect("create ~/.claude (initialized)");
+        write_json_file(
+            &get_claude_settings_path(),
+            &json!({
+                "env": {
+                    "ANTHROPIC_AUTH_TOKEN": "token1",
+                    "ANTHROPIC_BASE_URL": "https://claude.invalid",
+                    "MY_TEST_KEY": "1"
+                },
+                "hooks": {},
+                "permissions": { "allow": ["Bash"] },
+                "statusLine": { "type": "command", "command": "/bin/true" }
+            }),
+        )
+        .expect("seed live settings with common config applied");
+        let state = claude_state_using_common_with_status_line();
+
+        ProviderService::set_common_config_snippet(
+            &state,
+            AppType::Claude,
+            next.map(str::to_string),
+        )
+        .expect("update common snippet");
+
+        let live: Value = read_json_file(&get_claude_settings_path()).expect("read live settings");
+        assert_status_line_removed_and_user_objects_kept(&live);
+        assert_eq!(
+            live["env"].get("MY_TEST_KEY").is_some(),
+            next.is_some(),
+            "MY_TEST_KEY follows the new snippet ({next:?})"
+        );
+        assert_eq!(
+            live["env"]["ANTHROPIC_BASE_URL"], "https://claude.invalid",
+            "provider env is kept"
+        );
+    }
+}
+
+#[tokio::test]
+#[serial]
+async fn clearing_claude_common_snippet_during_takeover_drops_emptied_parent_objects() {
+    let temp_home = TempDir::new().expect("create temp home");
+    let _env = TestEnvGuard::isolated(temp_home.path());
+    std::fs::create_dir_all(crate::config::get_claude_config_dir())
+        .expect("create ~/.claude (initialized)");
+    let state = claude_state_using_common_with_status_line();
+    let provider = state
+        .config
+        .read()
+        .expect("read config")
+        .get_manager(&AppType::Claude)
+        .and_then(|manager| manager.providers.get("p1").cloned())
+        .expect("provider p1");
+    let backup = ProviderService::build_live_backup_snapshot(
+        &AppType::Claude,
+        &provider,
+        Some(CLAUDE_COMMON_WITH_STATUS_LINE),
+        true,
+    )
+    .expect("build effective backup");
+    state
+        .db
+        .save_live_backup(
+            AppType::Claude.as_str(),
+            &serde_json::to_string(&backup).expect("serialize backup"),
+        )
+        .await
+        .expect("seed takeover backup");
+    write_json_file(
+        &get_claude_settings_path(),
+        &json!({
+            "env": {
+                "ANTHROPIC_AUTH_TOKEN": "PROXY_MANAGED",
+                "ANTHROPIC_BASE_URL": "http://127.0.0.1:15721",
+                "MY_TEST_KEY": "1"
+            },
+            "hooks": {},
+            "permissions": { "allow": ["Bash"] },
+            "statusLine": { "type": "command", "command": "/bin/true" }
+        }),
+    )
+    .expect("seed takeover-owned live settings");
+
+    ProviderService::clear_common_config_snippet(&state, AppType::Claude)
+        .expect("clear common snippet during takeover");
+
+    let live: Value = read_json_file(&get_claude_settings_path()).expect("read takeover live");
+    assert_status_line_removed_and_user_objects_kept(&live);
+    assert_eq!(
+        live["env"],
+        json!({
+            "ANTHROPIC_AUTH_TOKEN": "PROXY_MANAGED",
+            "ANTHROPIC_BASE_URL": "http://127.0.0.1:15721"
+        }),
+        "proxy fields stay attached and the common env key is removed"
+    );
+}
+
 #[test]
 #[serial]
 fn clearing_claude_common_snippet_tolerates_invalid_stored_snippet() {