diff --git a/src/features/tmux-subagent/action-executor-core.ts b/src/features/tmux-subagent/action-executor-core.ts
index 466cbe95..70a8f463 100644
--- a/src/features/tmux-subagent/action-executor-core.ts
+++ b/src/features/tmux-subagent/action-executor-core.ts
@@ -72,7 +72,6 @@ export async function executeActionWithDeps(
 	)
 
 	if (result.success) {
-		await deps.applyLayout(ctx.config.layout, ctx.config.main_pane_size)
 		await enforceMainPane(ctx.windowState, ctx.config, deps)
 	}
 
diff --git a/src/features/tmux-subagent/action-executor.test.ts b/src/features/tmux-subagent/action-executor.test.ts
index f5ab3d74..18e24b44 100644
--- a/src/features/tmux-subagent/action-executor.test.ts
+++ b/src/features/tmux-subagent/action-executor.test.ts
@@ -66,7 +66,7 @@ describe("executeAction", () => {
 		mockSpawnTmuxPane.mockImplementation(async () => ({ success: true, paneId: "%7" }))
 	})
 
-	test("applies configured tmux layout after successful spawn", async () => {
+	test("enforces main pane width with configured percentage after successful spawn", async () => {
 		// given
 		// when
 		const result = await executeActionWithDeps(
@@ -83,8 +83,7 @@ describe("executeAction", () => {
 
 		// then
 		expect(result).toEqual({ success: true, paneId: "%7" })
-		expect(mockApplyLayout).toHaveBeenCalledTimes(1)
-		expect(mockApplyLayout).toHaveBeenCalledWith("main-horizontal", 55)
+		expect(mockApplyLayout).not.toHaveBeenCalled()
 		expect(mockEnforceMainPaneWidth).toHaveBeenCalledTimes(1)
 		expect(mockEnforceMainPaneWidth).toHaveBeenCalledWith("%0", 220, 55)
 	})