diff --git a/packages/types/src/experiment.ts b/packages/types/src/experiment.ts
index d7eb0b03d..5d511859b 100644
--- a/packages/types/src/experiment.ts
+++ b/packages/types/src/experiment.ts
@@ -6,7 +6,13 @@ import type { Keys, Equals, AssertEqual } from "./type-fu.js"
  * ExperimentId
  */
 
-export const experimentIds = ["preventFocusDisruption", "imageGeneration", "runSlashCommand", "customTools"] as const
+export const experimentIds = [
+	"preventFocusDisruption",
+	"imageGeneration",
+	"runSlashCommand",
+	"customTools",
+	"parallelToolExecution",
+] as const
 
 export const experimentIdsSchema = z.enum(experimentIds)
 
@@ -21,6 +27,7 @@ export const experimentsSchema = z.object({
 	imageGeneration: z.boolean().optional(),
 	runSlashCommand: z.boolean().optional(),
 	customTools: z.boolean().optional(),
+	parallelToolExecution: z.boolean().optional(),
 })
 
 export type Experiments = z.infer<typeof experimentsSchema>
diff --git a/src/shared/__tests__/experiments.spec.ts b/src/shared/__tests__/experiments.spec.ts
index 92a7d7604..f2261a5c0 100644
--- a/src/shared/__tests__/experiments.spec.ts
+++ b/src/shared/__tests__/experiments.spec.ts
@@ -21,6 +21,7 @@ describe("experiments", () => {
 				imageGeneration: false,
 				runSlashCommand: false,
 				customTools: false,
+				parallelToolExecution: false,
 			}
 			expect(Experiments.isEnabled(experiments, EXPERIMENT_IDS.PREVENT_FOCUS_DISRUPTION)).toBe(false)
 		})
@@ -31,6 +32,7 @@ describe("experiments", () => {
 				imageGeneration: false,
 				runSlashCommand: false,
 				customTools: false,
+				parallelToolExecution: false,
 			}
 			expect(Experiments.isEnabled(experiments, EXPERIMENT_IDS.PREVENT_FOCUS_DISRUPTION)).toBe(true)
 		})
@@ -41,8 +43,27 @@ describe("experiments", () => {
 				imageGeneration: false,
 				runSlashCommand: false,
 				customTools: false,
+				parallelToolExecution: false,
 			}
 			expect(Experiments.isEnabled(experiments, EXPERIMENT_IDS.PREVENT_FOCUS_DISRUPTION)).toBe(false)
 		})
 	})
+
+	describe("PARALLEL_TOOL_EXECUTION", () => {
+		it("is configured correctly", () => {
+			expect(EXPERIMENT_IDS.PARALLEL_TOOL_EXECUTION).toBe("parallelToolExecution")
+			expect(experimentConfigsMap.PARALLEL_TOOL_EXECUTION).toMatchObject({
+				enabled: false,
+				showInSettings: false,
+			})
+		})
+
+		it("returns false by default", () => {
+			expect(Experiments.isEnabled({}, "parallelToolExecution")).toBe(false)
+		})
+
+		it("returns true when enabled", () => {
+			expect(Experiments.isEnabled({ parallelToolExecution: true }, "parallelToolExecution")).toBe(true)
+		})
+	})
 })
diff --git a/src/shared/experiments.ts b/src/shared/experiments.ts
index e189f99e2..ae538b913 100644
--- a/src/shared/experiments.ts
+++ b/src/shared/experiments.ts
@@ -5,6 +5,7 @@ export const EXPERIMENT_IDS = {
 	IMAGE_GENERATION: "imageGeneration",
 	RUN_SLASH_COMMAND: "runSlashCommand",
 	CUSTOM_TOOLS: "customTools",
+	PARALLEL_TOOL_EXECUTION: "parallelToolExecution",
 } as const satisfies Record<string, ExperimentId>
 
 type _AssertExperimentIds = AssertEqual<Equals<ExperimentId, Values<typeof EXPERIMENT_IDS>>>
@@ -13,6 +14,8 @@ type ExperimentKey = Keys<typeof EXPERIMENT_IDS>
 
 interface ExperimentConfig {
 	enabled: boolean
+	/** Defaults to true; set to false to hide from the Settings panel. */
+	showInSettings?: boolean
 }
 
 export const experimentConfigsMap: Record<ExperimentKey, ExperimentConfig> = {
@@ -20,6 +23,8 @@ export const experimentConfigsMap: Record<ExperimentKey, ExperimentConfig> = {
 	IMAGE_GENERATION: { enabled: false },
 	RUN_SLASH_COMMAND: { enabled: false },
 	CUSTOM_TOOLS: { enabled: false },
+	// TODO: add i18n keys (settings:experimental.PARALLEL_TOOL_EXECUTION.name/.description) in the same PR that sets showInSettings: true
+	PARALLEL_TOOL_EXECUTION: { enabled: false, showInSettings: false },
 }
 
 export const experimentDefault = Object.fromEntries(
diff --git a/webview-ui/src/components/settings/ExperimentalSettings.tsx b/webview-ui/src/components/settings/ExperimentalSettings.tsx
index 23786ce0b..d5c55297e 100644
--- a/webview-ui/src/components/settings/ExperimentalSettings.tsx
+++ b/webview-ui/src/components/settings/ExperimentalSettings.tsx
@@ -51,6 +51,7 @@ export const ExperimentalSettings = ({
 			<Section>
 				{Object.entries(experimentConfigsMap)
 					.filter(([key]) => key in EXPERIMENT_IDS)
+					.filter(([, config]) => config.showInSettings !== false)
 					.map((config) => {
 						// Use the same translation key pattern as ExperimentalFeature
 						const experimentKey = config[0]
diff --git a/webview-ui/src/components/settings/__tests__/ExperimentalSettings.spec.tsx b/webview-ui/src/components/settings/__tests__/ExperimentalSettings.spec.tsx
new file mode 100644
index 000000000..b31f87dc7
--- /dev/null
+++ b/webview-ui/src/components/settings/__tests__/ExperimentalSettings.spec.tsx
@@ -0,0 +1,35 @@
+import { render, screen } from "@testing-library/react"
+
+import { experimentDefault } from "@roo/experiments"
+
+import { ExperimentalSettings } from "../ExperimentalSettings"
+
+vi.mock("@src/i18n/TranslationContext", () => ({
+	useAppTranslation: () => ({
+		t: (key: string) => key,
+	}),
+}))
+
+describe("ExperimentalSettings", () => {
+	const defaultProps = {
+		experiments: experimentDefault,
+		setExperimentEnabled: vi.fn(),
+		setImageGenerationProvider: vi.fn(),
+		setOpenRouterImageApiKey: vi.fn(),
+		setImageGenerationSelectedModel: vi.fn(),
+	}
+
+	beforeEach(() => {
+		vi.clearAllMocks()
+	})
+
+	it("does not render internal-only experiment flags", () => {
+		render(<ExperimentalSettings {...defaultProps} />)
+
+		expect(screen.getByText("settings:experimental.PREVENT_FOCUS_DISRUPTION.name")).toBeInTheDocument()
+		expect(screen.getByText("settings:experimental.RUN_SLASH_COMMAND.name")).toBeInTheDocument()
+		expect(screen.getByText("settings:experimental.IMAGE_GENERATION.name")).toBeInTheDocument()
+		expect(screen.getByText("settings:experimental.CUSTOM_TOOLS.name")).toBeInTheDocument()
+		expect(screen.queryByText("settings:experimental.PARALLEL_TOOL_EXECUTION.name")).not.toBeInTheDocument()
+	})
+})