diff --git a/codex-rs/tui/src/terminal_browser/tests.rs b/codex-rs/tui/src/terminal_browser/tests.rs
index aedc83ef65..8a5b8d5286 100644
--- a/codex-rs/tui/src/terminal_browser/tests.rs
+++ b/codex-rs/tui/src/terminal_browser/tests.rs
@@ -158,7 +158,7 @@ fn cropped_wide_glyph_is_replaced_with_a_blank_cell() {
 }
 
 #[test]
-fn dynamic_tools_are_namespaced_and_deferred() {
+fn terminal_browser_open_is_eager_and_other_dynamic_tools_are_deferred() {
     let specs = dynamic_tool_specs();
     let [DynamicToolSpec::Namespace(namespace)] = specs.as_slice() else {
         panic!("expected one terminal-browser namespace");
@@ -189,7 +189,14 @@ fn dynamic_tools_are_namespaced_and_deferred() {
             "close",
         ]
     );
-    assert!(tools.iter().all(|spec| spec.defer_loading));
+    assert!(
+        !tools[0].defer_loading,
+        "browser open must be visible immediately"
+    );
+    assert!(
+        tools[1..].iter().all(|spec| spec.defer_loading),
+        "follow-up browser tools should remain deferred"
+    );
     for tool_name in ["click", "fill"] {
         let node_id_pattern = tools
             .iter()
diff --git a/codex-rs/tui/src/terminal_browser/tools.rs b/codex-rs/tui/src/terminal_browser/tools.rs
index 9abf543243..c73fca0abf 100644
--- a/codex-rs/tui/src/terminal_browser/tools.rs
+++ b/codex-rs/tui/src/terminal_browser/tools.rs
@@ -16,9 +16,9 @@ pub(crate) fn dynamic_tool_specs() -> Vec<DynamicToolSpec> {
         description: "Control the browser rendered inside the terminal. Use these tools when the user asks for the terminal browser; do not substitute shell text browsers."
             .to_string(),
         tools: vec![
-            tool(
+            eager_tool(
                 "open",
-                "Open a URL in the terminal browser. The browser panel is watch-only; Codex controls the page.",
+                "Open a URL in the browser panel rendered inside the terminal. Use this tool whenever the user asks for the terminal browser or browser tab; do not substitute web search. An ephemeral profile is active by default, and the user can click the panel to take control.",
                 json!({
                     "type": "object",
                     "properties": {
@@ -114,7 +114,7 @@ pub(crate) fn dynamic_tool_specs() -> Vec<DynamicToolSpec> {
             ),
             tool(
                 "profile",
-                "List profiles or request a user-approved create, select, ephemeral, or forget operation.",
+                "List profiles or request a user-approved create, select, ephemeral, or forget operation. Profile changes are not required before opening a URL; an ephemeral profile is active by default.",
                 json!({
                     "type": "object",
                     "properties": {
@@ -242,12 +242,34 @@ fn tool(
     name: &str,
     description: &str,
     input_schema: serde_json::Value,
+) -> DynamicToolNamespaceTool {
+    dynamic_tool(name, description, input_schema, /*defer_loading*/ true)
+}
+
+fn eager_tool(
+    name: &str,
+    description: &str,
+    input_schema: serde_json::Value,
+) -> DynamicToolNamespaceTool {
+    dynamic_tool(
+        name,
+        description,
+        input_schema,
+        /*defer_loading*/ false,
+    )
+}
+
+fn dynamic_tool(
+    name: &str,
+    description: &str,
+    input_schema: serde_json::Value,
+    defer_loading: bool,
 ) -> DynamicToolNamespaceTool {
     DynamicToolNamespaceTool::Function(DynamicToolFunctionSpec {
         name: name.to_string(),
         description: description.to_string(),
         input_schema,
-        defer_loading: true,
+        defer_loading,
     })
 }
 
diff --git a/justfile b/justfile
index 1a82f30f49..088a2dc6d3 100644
--- a/justfile
+++ b/justfile
@@ -104,6 +104,14 @@ test-terminal-browser-panel *args:
         -E 'package(codex-utils-pty) | package(codex-terminal-browser) | package(codex-sandboxing) | package(codex-linux-sandbox) | package(codex-features) | package(codex-protocol) | package(codex-app-server-protocol) | (package(codex-exec-server) & test(/sandbox_request_allows_prepared_managed_proxy_port|sandbox_exec_request_carries_helper_env/)) | (package(codex-core) & test(/config_schema_matches_fixture|active_profile_update_rebuilds_network_proxy_config|current_network_proxy_runtime|managed_network_proxy_decider_survives_full_access_start|managed_network_proxy_refresh_failure|new_turn_refreshes_managed_network_proxy_for_sandbox_change|danger_full_access_turns_do_not_expose_managed_network_proxy|workspace_write_turns_continue_to_expose_managed_network_proxy/)) | (package(codex-app-server) & test(/thread_start_returns_live_managed_proxy_in_experimental_extra|thread_settings_update_reports_current_managed_proxy_runtime/)) | (package(codex-tui) & test(/terminal_browser|owned_screen_browser|bare_browser|browser_show_alias|network_reconciliation|inactive_thread_settings_notification|proxy_runtime|thread_read_fallback_uses_active_permission_settings/))' \
         "$@"
 
+# Run the short permission and tool-routing regressions for the terminal browser.
+[unix]
+test-terminal-browser-routing *args:
+    just test \
+        -p codex-tui \
+        -E 'package(codex-tui) & test(/terminal_browser_(auto_review|managed_network|detects_user_network|open_is_eager)|permissions_auto_review_selection_defers/)' \
+        "$@"
+
 # Run from the repository root so scripts that resolve paths from `cwd` see
 # the same layout they use in GitHub Actions.
 [no-cd]