diff --git a/codex-rs/app-server/README.md b/codex-rs/app-server/README.md
index e2978861d..7a811ab69 100644
--- a/codex-rs/app-server/README.md
+++ b/codex-rs/app-server/README.md
@@ -189,7 +189,7 @@ Example with notification opt-out:
 - `model/list` — list available models (set `includeHidden: true` to include entries with `hidden: true`), with reasoning effort options, `additionalSpeedTiers`, optional legacy `upgrade` model ids, optional `upgradeInfo` metadata (`model`, `upgradeCopy`, `modelLink`, `migrationMarkdown`), and optional `availabilityNux` metadata.
 - `modelProvider/capabilities/read` — read provider-level capabilities for the currently configured model provider.
 - `experimentalFeature/list` — list feature flags with stage metadata (`beta`, `underDevelopment`, `stable`, etc.), enabled/default-enabled state, and cursor pagination. Pass `threadId` when showing feature state for an existing loaded thread so `enabled` is computed from that thread's refreshed config, including project-local config for the thread's cwd; if omitted, the server uses its default config resolution context. For non-beta flags, `displayName`/`description`/`announcement` are `null`.
-- `experimentalFeature/enablement/set` — patch the in-memory process-wide runtime feature enablement for the currently supported feature keys (`apps`, `memories`, `plugins`, `tool_search`, `tool_suggest`, `tool_call_mcp_elicitation`). For each feature, precedence is: cloud requirements > --enable <feature_name> > config.toml > experimentalFeature/enablement/set (new) > code default.
+- `experimentalFeature/enablement/set` — patch the in-memory process-wide runtime feature enablement for the currently supported feature keys (`apps`, `memories`, `plugins`, `tool_suggest`, `tool_call_mcp_elicitation`). For each feature, precedence is: cloud requirements > --enable <feature_name> > config.toml > experimentalFeature/enablement/set (new) > code default.
 - `environment/add` — experimental; add or replace a named remote environment by `environmentId` and `execServerUrl` for later selection by `thread/start` or `turn/start`; returns `{}` and does not change the default environment.
 - `collaborationMode/list` — list available collaboration mode presets (experimental, no pagination). Built-in presets do not select a model; the Plan preset selects medium reasoning effort. This response omits built-in developer instructions; clients should either pass `settings.developer_instructions: null` when setting a mode to use Codex's built-in instructions, or provide their own instructions explicitly.
 - `skills/list` — list skills for one or more `cwd` values (optional `forceReload`).
diff --git a/codex-rs/app-server/src/request_processors/config_processor.rs b/codex-rs/app-server/src/request_processors/config_processor.rs
index b7f973b07..5054ea248 100644
--- a/codex-rs/app-server/src/request_processors/config_processor.rs
+++ b/codex-rs/app-server/src/request_processors/config_processor.rs
@@ -53,7 +53,6 @@ const SUPPORTED_EXPERIMENTAL_FEATURE_ENABLEMENT: &[&str] = &[
     "mentions_v2",
     "plugins",
     "remote_control",
-    "tool_search",
     "tool_suggest",
     "tool_call_mcp_elicitation",
 ];
diff --git a/codex-rs/app-server/tests/suite/v2/experimental_feature_list.rs b/codex-rs/app-server/tests/suite/v2/experimental_feature_list.rs
index 279fa60da..d6101995f 100644
--- a/codex-rs/app-server/tests/suite/v2/experimental_feature_list.rs
+++ b/codex-rs/app-server/tests/suite/v2/experimental_feature_list.rs
@@ -340,7 +340,6 @@ async fn experimental_feature_enablement_set_only_updates_named_features() -> Re
         BTreeMap::from([
             ("memories".to_string(), true),
             ("plugins".to_string(), true),
-            ("tool_search".to_string(), true),
             ("tool_suggest".to_string(), true),
             ("tool_call_mcp_elicitation".to_string(), false),
         ]),
@@ -353,7 +352,6 @@ async fn experimental_feature_enablement_set_only_updates_named_features() -> Re
             enablement: BTreeMap::from([
                 ("memories".to_string(), true),
                 ("plugins".to_string(), true),
-                ("tool_search".to_string(), true),
                 ("tool_suggest".to_string(), true),
                 ("tool_call_mcp_elicitation".to_string(), false),
             ]),
@@ -383,13 +381,6 @@ async fn experimental_feature_enablement_set_only_updates_named_features() -> Re
             .and_then(|features| features.get("plugins")),
         Some(&json!(true))
     );
-    assert_eq!(
-        config
-            .additional
-            .get("features")
-            .and_then(|features| features.get("tool_search")),
-        Some(&json!(true))
-    );
     assert_eq!(
         config
             .additional
@@ -483,7 +474,7 @@ async fn experimental_feature_enablement_set_rejects_non_allowlisted_feature() -
     );
     assert!(
         error.message.contains(
-            "apps, memories, mentions_v2, plugins, remote_control, tool_search, tool_suggest, tool_call_mcp_elicitation"
+            "apps, memories, mentions_v2, plugins, remote_control, tool_suggest, tool_call_mcp_elicitation"
         ),
         "{}",
         error.message
diff --git a/codex-rs/core/src/tools/spec_plan_model_tests.rs b/codex-rs/core/src/tools/spec_plan_model_tests.rs
index 3390d26e0..1896a7345 100644
--- a/codex-rs/core/src/tools/spec_plan_model_tests.rs
+++ b/codex-rs/core/src/tools/spec_plan_model_tests.rs
@@ -793,7 +793,6 @@ async fn request_plugin_install_requires_apps_and_plugins_features() {
 
     for disabled_feature in [Feature::Apps, Feature::Plugins] {
         let mut features = Features::with_defaults();
-        features.enable(Feature::ToolSearch);
         features.enable(Feature::ToolSuggest);
         features.enable(Feature::Apps);
         features.enable(Feature::Plugins);
@@ -832,7 +831,6 @@ async fn search_tool_is_hidden_without_deferred_tools() {
     let model_info = search_capable_model_info().await;
     let mut features = Features::with_defaults();
     features.enable(Feature::Apps);
-    features.enable(Feature::ToolSearch);
     let available_models = Vec::new();
     let tools_config = ToolsConfig::new(&ToolsConfigParams {
         model_info: &model_info,
@@ -863,7 +861,6 @@ async fn search_tool_description_falls_back_to_connector_name_without_descriptio
     let model_info = search_capable_model_info().await;
     let mut features = Features::with_defaults();
     features.enable(Feature::Apps);
-    features.enable(Feature::ToolSearch);
     let available_models = Vec::new();
     let tools_config = ToolsConfig::new(&ToolsConfigParams {
         model_info: &model_info,
diff --git a/codex-rs/core/src/tools/spec_plan_tests.rs b/codex-rs/core/src/tools/spec_plan_tests.rs
index 3442fbb5f..1b64093ad 100644
--- a/codex-rs/core/src/tools/spec_plan_tests.rs
+++ b/codex-rs/core/src/tools/spec_plan_tests.rs
@@ -1653,7 +1653,6 @@ fn search_tool_description_lists_each_mcp_source_once() {
     let model_info = search_capable_model_info();
     let mut features = Features::with_defaults();
     features.enable(Feature::Apps);
-    features.enable(Feature::ToolSearch);
     let available_models = Vec::new();
     let tools_config = ToolsConfig::new(&ToolsConfigParams {
         model_info: &model_info,
@@ -1726,7 +1725,7 @@ fn search_tool_description_lists_each_mcp_source_once() {
 }
 
 #[test]
-fn search_tool_requires_model_capability_and_enabled_feature() {
+fn search_tool_requires_model_capability() {
     let model_info = search_capable_model_info();
     let deferred_mcp_tools = Some(vec![deferred_mcp_tool(
         "_create_event",
@@ -1759,26 +1758,6 @@ fn search_tool_requires_model_capability_and_enabled_feature() {
     );
     assert_lacks_tool_name(&tools, TOOL_SEARCH_TOOL_NAME);
 
-    let mut features_without_tool_search = Features::with_defaults();
-    features_without_tool_search.disable(Feature::ToolSearch);
-    let tools_config = ToolsConfig::new(&ToolsConfigParams {
-        model_info: &model_info,
-        available_models: &available_models,
-        features: &features_without_tool_search,
-        image_generation_tool_auth_allowed: true,
-        web_search_mode: Some(WebSearchMode::Cached),
-        session_source: SessionSource::Cli,
-        permission_profile: &PermissionProfile::Disabled,
-        windows_sandbox_level: WindowsSandboxLevel::Disabled,
-    });
-    let (tools, _) = build_specs(
-        &tools_config,
-        /*mcp_tools*/ None,
-        deferred_mcp_tools.clone(),
-        &[],
-    );
-    assert_lacks_tool_name(&tools, TOOL_SEARCH_TOOL_NAME);
-
     let tools_config = ToolsConfig::new(&ToolsConfigParams {
         model_info: &model_info,
         available_models: &available_models,
@@ -1801,8 +1780,7 @@ fn search_tool_requires_model_capability_and_enabled_feature() {
 #[test]
 fn no_search_tool_when_namespaces_disabled() {
     let model_info = search_capable_model_info();
-    let mut features = Features::with_defaults();
-    features.enable(Feature::ToolSearch);
+    let features = Features::with_defaults();
     let available_models = Vec::new();
     let mut tools_config = ToolsConfig::new(&ToolsConfigParams {
         model_info: &model_info,
@@ -1836,8 +1814,7 @@ fn no_search_tool_when_namespaces_disabled() {
 #[test]
 fn search_tool_registers_for_deferred_dynamic_tools() {
     let model_info = search_capable_model_info();
-    let mut features = Features::with_defaults();
-    features.enable(Feature::ToolSearch);
+    let features = Features::with_defaults();
     let available_models = Vec::new();
     let tools_config = ToolsConfig::new(&ToolsConfigParams {
         model_info: &model_info,
@@ -1896,8 +1873,7 @@ fn search_tool_registers_for_deferred_dynamic_tools() {
 #[test]
 fn search_tool_is_hidden_for_deferred_dynamic_tools_when_namespace_tools_are_disabled() {
     let model_info = search_capable_model_info();
-    let mut features = Features::with_defaults();
-    features.enable(Feature::ToolSearch);
+    let features = Features::with_defaults();
     let available_models = Vec::new();
     let mut tools_config = ToolsConfig::new(&ToolsConfigParams {
         model_info: &model_info,
@@ -1946,7 +1922,6 @@ fn search_tool_is_hidden_for_deferred_dynamic_tools_when_namespace_tools_are_dis
 fn request_plugin_install_is_not_registered_without_feature_flag() {
     let model_info = search_capable_model_info();
     let mut features = Features::with_defaults();
-    features.enable(Feature::ToolSearch);
     features.enable(Feature::Apps);
     features.enable(Feature::Plugins);
     features.disable(Feature::ToolSuggest);
@@ -2036,7 +2011,6 @@ fn request_plugin_install_description_lists_discoverable_tools() {
     let mut features = Features::with_defaults();
     features.enable(Feature::Apps);
     features.enable(Feature::Plugins);
-    features.enable(Feature::ToolSearch);
     features.enable(Feature::ToolSuggest);
     let available_models = Vec::new();
     let tools_config = ToolsConfig::new(&ToolsConfigParams {
diff --git a/codex-rs/core/tests/suite/code_mode.rs b/codex-rs/core/tests/suite/code_mode.rs
index f117631c4..beae9e4af 100644
--- a/codex-rs/core/tests/suite/code_mode.rs
+++ b/codex-rs/core/tests/suite/code_mode.rs
@@ -400,10 +400,6 @@ if (!tool) {
                 .features
                 .enable(Feature::Apps)
                 .expect("test config should allow feature update");
-            config
-                .features
-                .enable(Feature::ToolSearch)
-                .expect("test config should allow feature update");
             config
                 .features
                 .enable(Feature::CodeMode)
diff --git a/codex-rs/core/tests/suite/search_tool.rs b/codex-rs/core/tests/suite/search_tool.rs
index 69dc74dce..ae897f277 100644
--- a/codex-rs/core/tests/suite/search_tool.rs
+++ b/codex-rs/core/tests/suite/search_tool.rs
@@ -4,7 +4,6 @@
 use anyhow::Result;
 use codex_config::types::McpServerConfig;
 use codex_config::types::McpServerTransportConfig;
-use codex_core::config::Config;
 use codex_features::Feature;
 use codex_login::CodexAuth;
 use codex_protocol::dynamic_tools::DynamicToolCallOutputContentItem;
@@ -113,14 +112,6 @@ fn tool_search_output_has_namespace_child(
     namespace_child_tool(&output, namespace, tool_name).is_some()
 }
 
-fn configure_apps_without_tool_search(config: &mut Config, apps_base_url: &str) {
-    configure_search_capable_apps(config, apps_base_url);
-    config
-        .features
-        .disable(Feature::ToolSearch)
-        .expect("test config should allow feature update");
-}
-
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
 async fn search_tool_enabled_by_default_adds_tool_search() -> Result<()> {
     skip_if_no_network!(Ok(()));
@@ -225,54 +216,6 @@ async fn always_defer_feature_hides_small_app_tool_sets() -> Result<()> {
     Ok(())
 }
 
-#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
-async fn tool_search_disabled_exposes_apps_tools_directly() -> Result<()> {
-    skip_if_no_network!(Ok(()));
-
-    let server = start_mock_server().await;
-    let apps_server = AppsTestServer::mount_searchable(&server).await?;
-    let mock = mount_sse_once(
-        &server,
-        sse(vec![
-            ev_response_created("resp-1"),
-            ev_assistant_message("msg-1", "done"),
-            ev_completed("resp-1"),
-        ]),
-    )
-    .await;
-
-    let mut builder = test_codex()
-        .with_auth(CodexAuth::create_dummy_chatgpt_auth_for_testing())
-        .with_config(move |config| {
-            configure_apps_without_tool_search(config, apps_server.chatgpt_base_url.as_str())
-        });
-    let test = builder.build(&server).await?;
-
-    test.submit_turn_with_approval_and_permission_profile(
-        "list tools",
-        AskForApproval::Never,
-        PermissionProfile::Disabled,
-    )
-    .await?;
-
-    let body = mock.single_request().body_json();
-    let tools = tool_names(&body);
-    assert!(!tools.iter().any(|name| name == TOOL_SEARCH_TOOL_NAME));
-    assert!(
-        namespace_child_tool(
-            &body,
-            SEARCH_CALENDAR_NAMESPACE,
-            SEARCH_CALENDAR_CREATE_TOOL
-        )
-        .is_some()
-    );
-    assert!(
-        namespace_child_tool(&body, SEARCH_CALENDAR_NAMESPACE, SEARCH_CALENDAR_LIST_TOOL).is_some()
-    );
-
-    Ok(())
-}
-
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
 async fn search_tool_is_hidden_for_api_key_auth() -> Result<()> {
     skip_if_no_network!(Ok(()));
diff --git a/codex-rs/features/src/lib.rs b/codex-rs/features/src/lib.rs
index fca2473c6..c20fa8683 100644
--- a/codex-rs/features/src/lib.rs
+++ b/codex-rs/features/src/lib.rs
@@ -132,7 +132,7 @@ pub enum Feature {
     EnableMcpApps,
     /// Use the new path for the host-owned apps MCP server.
     AppsMcpPathOverride,
-    /// Enable the tool_search tool for apps.
+    /// Removed compatibility flag retained as a no-op now that tool_search is always enabled.
     ToolSearch,
     /// Always defer MCP tools behind tool_search instead of exposing small sets directly.
     ToolSearchAlwaysDeferMcpTools,
@@ -428,6 +428,9 @@ impl Features {
                 "apply_patch_freeform" => {
                     continue;
                 }
+                "tool_search" => {
+                    continue;
+                }
                 "image_detail_original" => {
                     continue;
                 }
@@ -946,8 +949,8 @@ pub const FEATURES: &[FeatureSpec] = &[
     FeatureSpec {
         id: Feature::ToolSearch,
         key: "tool_search",
-        stage: Stage::Stable,
-        default_enabled: true,
+        stage: Stage::Removed,
+        default_enabled: false,
     },
     FeatureSpec {
         id: Feature::ToolSearchAlwaysDeferMcpTools,
diff --git a/codex-rs/features/src/tests.rs b/codex-rs/features/src/tests.rs
index f4aa3982b..e2a456f1b 100644
--- a/codex-rs/features/src/tests.rs
+++ b/codex-rs/features/src/tests.rs
@@ -188,9 +188,10 @@ fn network_proxy_is_experimental_and_disabled_by_default() {
 }
 
 #[test]
-fn tool_search_is_stable_and_enabled_by_default() {
-    assert_eq!(Feature::ToolSearch.stage(), Stage::Stable);
-    assert_eq!(Feature::ToolSearch.default_enabled(), true);
+fn tool_search_is_removed_and_disabled_by_default() {
+    assert_eq!(Feature::ToolSearch.stage(), Stage::Removed);
+    assert_eq!(Feature::ToolSearch.default_enabled(), false);
+    assert_eq!(feature_for_key("tool_search"), Some(Feature::ToolSearch));
 }
 
 #[test]
@@ -603,7 +604,6 @@ fn materialize_resolved_enabled_writes_all_features_and_preserves_custom_config(
     features.enable(Feature::CodeMode);
     features.enable(Feature::MultiAgentV2);
     features.enable(Feature::NetworkProxy);
-    features.disable(Feature::ToolSearch);
 
     let mut features_toml = FeaturesToml {
         multi_agent_v2: Some(FeatureToml::Config(crate::MultiAgentV2ConfigToml {
diff --git a/codex-rs/tools/src/tool_config.rs b/codex-rs/tools/src/tool_config.rs
index 5c1681d16..b6f4ae8db 100644
--- a/codex-rs/tools/src/tool_config.rs
+++ b/codex-rs/tools/src/tool_config.rs
@@ -182,8 +182,7 @@ impl ToolsConfig {
         let include_multi_agent_v2 = features.enabled(Feature::MultiAgentV2);
         let include_collab_tools = include_multi_agent_v2 || features.enabled(Feature::Collab);
         let include_agent_jobs = features.enabled(Feature::SpawnCsv);
-        let include_search_tool =
-            model_info.supports_search_tool && features.enabled(Feature::ToolSearch);
+        let include_search_tool = model_info.supports_search_tool;
         let include_tool_suggest = features.enabled(Feature::ToolSuggest)
             && features.enabled(Feature::Apps)
             && features.enabled(Feature::Plugins);