diff --git a/test/vitest-scoped-config.test.ts b/test/vitest-scoped-config.test.ts
index 6c669424f4c6..6ee42242dd94 100644
--- a/test/vitest-scoped-config.test.ts
+++ b/test/vitest-scoped-config.test.ts
@@ -610,9 +610,13 @@ describe("scoped vitest configs", () => {
     expect(requireTestConfig(defaultCliConfig).exclude).toEqual(
       expect.arrayContaining(cliProcessTestFiles.map((file) => file.replace("src/cli/", ""))),
     );
-    expect(requireTestConfig(defaultCliProcessConfig).include).toEqual(cliProcessTestFiles);
-    expect(requireTestConfig(defaultCliProcessConfig).fileParallelism).toBe(false);
-    expect(requireTestConfig(defaultCliProcessConfig).env).toMatchObject({
+    const processTestConfig = requireTestConfig(defaultCliProcessConfig);
+    expect(processTestConfig.include).toEqual(cliProcessTestFiles);
+    for (const file of cliProcessTestFiles) {
+      expect(matchingExcludePatterns(processTestConfig.exclude ?? [], file), file).toEqual([]);
+    }
+    expect(processTestConfig.fileParallelism).toBe(false);
+    expect(processTestConfig.env).toMatchObject({
       ESBUILD_WORKER_THREADS: "0",
     });
   });
diff --git a/test/vitest-unit-fast-config.test.ts b/test/vitest-unit-fast-config.test.ts
index 5b34551a1159..d7bbb24092a7 100644
--- a/test/vitest-unit-fast-config.test.ts
+++ b/test/vitest-unit-fast-config.test.ts
@@ -2,6 +2,7 @@
 import path from "node:path";
 import { beforeAll, describe, expect, it } from "vitest";
 import { spawnNodeEvalSync } from "../src/test-utils/node-process.js";
+import { cliProcessTestFiles } from "./vitest/vitest.cli-process-paths.mjs";
 import { createCommandsLightVitestConfig } from "./vitest/vitest.commands-light.config.ts";
 import { createPluginSdkLightVitestConfig } from "./vitest/vitest.plugin-sdk-light.config.ts";
 import { createUnitFastFakeTimersVitestConfig } from "./vitest/vitest.unit-fast-fake-timers.config.ts";
@@ -217,6 +218,13 @@ describe("unit-fast vitest lane", () => {
     ]);
   });
 
+  it("keeps process-launching CLI files in their owner lane", () => {
+    for (const file of cliProcessTestFiles) {
+      expect(isUnitFastTestFile(file), file).toBe(false);
+      expect(unitFastTestFiles, file).not.toContain(file);
+    }
+  });
+
   it("routes unit-fast source files to their unit-fast sibling tests", () => {
     expect(resolveUnitFastTestIncludePattern("src/plugin-sdk/provider-entry.ts")).toBe(
       "src/plugin-sdk/provider-entry.test.ts",
diff --git a/test/vitest/vitest.unit-fast-paths.mjs b/test/vitest/vitest.unit-fast-paths.mjs
index 2cef60965b51..ed2a1dc4681e 100644
--- a/test/vitest/vitest.unit-fast-paths.mjs
+++ b/test/vitest/vitest.unit-fast-paths.mjs
@@ -2,6 +2,7 @@
 import { spawnSync } from "node:child_process";
 import fs from "node:fs";
 import path from "node:path";
+import { cliProcessTestFiles } from "./vitest.cli-process-paths.mjs";
 import {
   commandsLightSourceFiles,
   commandsLightTestFiles,
@@ -165,6 +166,7 @@ const broadUnitFastCandidateGlobs = [
   "test/**/*.test.ts",
 ];
 const ownerRoutedUnitTestPatterns = [
+  ...cliProcessTestFiles,
   "src/agents/embedded-agent-runner/run/attempt.abort-race.test.ts",
   "src/agents/openai-transport-stream.*.test.ts",
   "src/agents/embedded-agent-runner/run.shared-integration.test.ts",