fix: keep tool hidden when disabled/not configured

- Only show codebase_search when feature is enabled AND configured
- Tool is now visible during indexing (Standby/Indexing states)
- Added test to verify tool availability during initialization

src/core/prompts/tools/index.ts

@@ -101,8 +101,11 @@ export function getToolDescriptionsForMode(
 	// Add always available tools
 	ALWAYS_AVAILABLE_TOOLS.forEach((tool) => tools.add(tool))
 
-	// Note: codebase_search is now always included in the tool list
-	// The tool itself will check the indexing state at runtime and provide appropriate feedback
+	// Conditionally exclude codebase_search if feature is disabled or not configured
+	// Note: We still show the tool when it's initialized but indexing is in progress
+	if (!codeIndexManager || !codeIndexManager.isFeatureEnabled || !codeIndexManager.isFeatureConfigured) {
+		tools.delete("codebase_search")
+	}
 
 	// Conditionally exclude update_todo_list if disabled in settings
 	if (settings?.todoListEnabled === false) {

src/core/tools/__tests__/codebaseSearchTool.spec.ts

@@ -243,6 +243,37 @@ describe("codebaseSearchTool", () => {
 				}),
 			)
 		})
+
+		it("should be available when enabled and configured but not initialized", async () => {
+			// This test verifies that the tool is available even when indexing is not complete
+			// The tool itself will handle the state checking
+			mockCodeIndexManager.isFeatureEnabled = true
+			mockCodeIndexManager.isFeatureConfigured = true
+			mockCodeIndexManager.isInitialized = false
+			mockCodeIndexManager.state = "Standby"
+
+			const block: ToolUse = {
+				type: "tool_use",
+				name: "codebase_search",
+				params: { query: "test query" },
+				partial: false,
+			}
+
+			await codebaseSearchTool(
+				mockTask,
+				block,
+				mockAskApproval,
+				mockHandleError,
+				mockPushToolResult,
+				mockRemoveClosingTag,
+			)
+
+			// Should not throw an error, but should provide feedback about the state
+			expect(mockHandleError).not.toHaveBeenCalled()
+			expect(mockPushToolResult).toHaveBeenCalledWith(
+				expect.stringContaining("Semantic search is not available yet (currently Standby)"),
+			)
+		})
 	})
 
 	describe("parameter validation", () => {