agent: Separate flag for rename tool (#56228)

Pulls the rename tool into a separate flag and staff ships it

Release Notes:

- N/A or Added/Fixed/Improved ...

crates/agent/src/tests/mod.rs

@@ -5664,12 +5664,11 @@ async fn test_lsp_tools_gated_by_feature_flag(cx: &mut TestAppContext) {
         GetCodeActionsTool::NAME,
         ApplyCodeActionTool::NAME,
         GoToDefinitionTool::NAME,
-        RenameTool::NAME,
     ];
 
-    // All LSP tools should be registered on the thread regardless of the flag,
-    // since the feature flag now only controls exposure to the model rather
-    // than registration.
+    // All LSP tools and the rename tool should be registered on the thread
+    // regardless of the flag, since the feature flags only control exposure
+    // to the model rather than registration.
     thread.read_with(cx, |thread, _| {
         for name in &lsp_tool_names {
             assert!(
@@ -5677,10 +5676,16 @@ async fn test_lsp_tools_gated_by_feature_flag(cx: &mut TestAppContext) {
                 "expected LSP tool {name} to be registered"
             );
         }
+        assert!(
+            thread.has_registered_tool(RenameTool::NAME),
+            "expected rename tool to be registered"
+        );
     });
 
     // Without the `lsp-tool` flag, sending a message should produce a
     // completion request whose tool list excludes the LSP tools.
+    // The rename tool is on its own `rename-tool` flag with
+    // `enabled_for_staff`, so it is already visible in debug builds.
     thread
         .update(cx, |thread, cx| {
             thread.send(UserMessageId::new(), ["hello"], cx)
@@ -5697,6 +5702,11 @@ async fn test_lsp_tools_gated_by_feature_flag(cx: &mut TestAppContext) {
              but completion tools were: {tool_names:?}"
         );
     }
+    assert!(
+        tool_names.iter().any(|t| t == RenameTool::NAME),
+        "expected rename tool to be visible (enabled_for_staff in debug builds), \
+         but completion tools were: {tool_names:?}"
+    );
     // Sanity check: a non-LSP default tool should still be exposed.
     assert!(
         tool_names.iter().any(|t| t == ReadFileTool::NAME),
@@ -5727,6 +5737,11 @@ async fn test_lsp_tools_gated_by_feature_flag(cx: &mut TestAppContext) {
              but completion tools were: {tool_names:?}"
         );
     }
+    assert!(
+        tool_names.iter().any(|t| t == RenameTool::NAME),
+        "expected rename tool to still be exposed, \
+         but completion tools were: {tool_names:?}"
+    );
 }
 
 #[gpui::test]

crates/agent/src/thread.rs

@@ -10,7 +10,7 @@ use acp_thread::{MentionUri, UserMessageId};
 use action_log::ActionLog;
 use feature_flags::{
     ExperimentalSystemPromptFeatureFlag, FeatureFlagAppExt as _, LspToolFeatureFlag,
-    UpdatePlanToolFeatureFlag,
+    RenameToolFeatureFlag, UpdatePlanToolFeatureFlag,
 };
 
 use agent_client_protocol::schema as acp;
@@ -2936,16 +2936,13 @@ impl Thread {
                     None
                 }
             })
-            .filter(|(tool_name, _)| {
-                cx.has_flag::<LspToolFeatureFlag>()
-                    || !matches!(
-                        tool_name.as_ref(),
-                        FindReferencesTool::NAME
-                            | GetCodeActionsTool::NAME
-                            | ApplyCodeActionTool::NAME
-                            | GoToDefinitionTool::NAME
-                            | RenameTool::NAME
-                    )
+            .filter(|(tool_name, _)| match tool_name.as_ref() {
+                RenameTool::NAME => cx.has_flag::<RenameToolFeatureFlag>(),
+                FindReferencesTool::NAME
+                | GetCodeActionsTool::NAME
+                | ApplyCodeActionTool::NAME
+                | GoToDefinitionTool::NAME => cx.has_flag::<LspToolFeatureFlag>(),
+                _ => true,
             })
             .collect::<BTreeMap<_, _>>();
 

crates/feature_flags/src/flags.rs

@@ -95,6 +95,18 @@ impl FeatureFlag for LspToolFeatureFlag {
 }
 register_feature_flag!(LspToolFeatureFlag);
 
+pub struct RenameToolFeatureFlag;
+
+impl FeatureFlag for RenameToolFeatureFlag {
+    const NAME: &'static str = "rename-tool";
+    type Value = PresenceFlag;
+
+    fn enabled_for_staff() -> bool {
+        true
+    }
+}
+register_feature_flag!(RenameToolFeatureFlag);
+
 pub struct ProjectPanelUndoRedoFeatureFlag;
 
 impl FeatureFlag for ProjectPanelUndoRedoFeatureFlag {