diff --git a/src/main/providers/agent-foreground-process.test.ts b/src/main/providers/agent-foreground-process.test.ts
index a54ee116ca5..c21d501b49a 100644
--- a/src/main/providers/agent-foreground-process.test.ts
+++ b/src/main/providers/agent-foreground-process.test.ts
@@ -10,6 +10,7 @@ vi.mock('child_process', () => ({
 
 import { resetProcessTableSnapshotForTests } from '../../shared/process-table-snapshot'
 import { resolveAgentForegroundProcess } from './agent-foreground-process'
+import { resetWindowsProcessRowsSnapshotForTests } from './windows-foreground-process-rows'
 
 // Why: the module wraps execFile with promisify, so the mock must honor the
 // Node callback contract — invoke the last arg with (err, { stdout, stderr }).
@@ -73,6 +74,9 @@ describe('resolveAgentForegroundProcess', () => {
   beforeEach(() => {
     execFileMock.mockReset()
     resetProcessTableSnapshotForTests()
+    // Why: the Windows rows reader caches across calls (500ms TTL), so each
+    // case's execFile mock must not be answered by the previous case's rows.
+    resetWindowsProcessRowsSnapshotForTests()
     platform = Object.getOwnPropertyDescriptor(process, 'platform')
     Object.defineProperty(process, 'platform', { value: 'darwin' })
   })