diff --git a/apps/server/src/orchestration-v2/ThreadLaunchService.test.ts b/apps/server/src/orchestration-v2/ThreadLaunchService.test.ts
index ce9e872b9774a..fb8bfb14230da 100644
--- a/apps/server/src/orchestration-v2/ThreadLaunchService.test.ts
+++ b/apps/server/src/orchestration-v2/ThreadLaunchService.test.ts
@@ -261,7 +261,12 @@ function makeHarness(options: HarnessOptions = {}) {
   });
   const layerTitleRegeneration = ThreadTitleRegeneration.layer.pipe(
     Layer.provide(
-      Layer.mergeAll(layerThreadManagement, layerProjectedProjects, layerExternalServices),
+      Layer.mergeAll(
+        layerThreadManagement,
+        layerProjectedProjects,
+        layerExternalServices,
+        NodeServices.layer,
+      ),
     ),
   );
   return {
diff --git a/apps/server/src/orchestration-v2/ThreadTitleRegenerationService.test.ts b/apps/server/src/orchestration-v2/ThreadTitleRegenerationService.test.ts
index 8f7de819f5718..c54e6e1f4815d 100644
--- a/apps/server/src/orchestration-v2/ThreadTitleRegenerationService.test.ts
+++ b/apps/server/src/orchestration-v2/ThreadTitleRegenerationService.test.ts
@@ -1,4 +1,5 @@
 import { assert, describe, it, vi } from "@effect/vitest";
+import * as NodeServices from "@effect/platform-node/NodeServices";
 import {
   CommandId,
   ChatAttachmentId,
@@ -14,6 +15,7 @@ import {
 } from "@t3tools/contracts";
 import * as DateTime from "effect/DateTime";
 import * as Effect from "effect/Effect";
+import * as FileSystem from "effect/FileSystem";
 import * as Layer from "effect/Layer";
 import * as Option from "effect/Option";
 import { ATTACHMENT_ONLY_BOOTSTRAP_PROMPT } from "@t3tools/shared/composerContextReferences";
@@ -98,6 +100,7 @@ function makeHarness(
         layerProjectedProjects,
         Layer.mock(TextGeneration.TextGeneration)({ generateThreadTitle }),
         layerServerSettings,
+        NodeServices.layer,
       ),
     ),
   );
@@ -113,7 +116,11 @@ function makeHarness(
   };
 }
 
-function createThread(input: { readonly command: string; readonly thread: string }) {
+function createThread(input: {
+  readonly command: string;
+  readonly thread: string;
+  readonly worktreePath?: string;
+}) {
   return Effect.gen(function* () {
     const threads = yield* ThreadManagement.ThreadManagementService;
     const threadId = ThreadId.make(input.thread);
@@ -127,7 +134,7 @@ function createThread(input: { readonly command: string; readonly thread: string
       runtimeMode: "full-access",
       interactionMode: "default",
       branch: null,
-      worktreePath: null,
+      worktreePath: input.worktreePath ?? null,
       createdBy: "user",
       creationSource: "web",
     });
@@ -391,31 +398,43 @@ describe("ThreadTitleRegenerationService", () => {
       const harness = makeHarness({
         generateTitle: () => Effect.succeed({ title: "Fresh title" }),
       });
+      const fs = yield* FileSystem.FileSystem;
+      const existingWorktree = yield* fs.makeTempDirectoryScoped({ prefix: "title-worktree-" });
       yield* Effect.gen(function* () {
         const threads = yield* ThreadManagement.ThreadManagementService;
         const titleRegeneration = yield* ThreadTitleRegeneration.ThreadTitleRegenerationService;
-        const threadId = yield* createThread({
-          command: "command:title:landing:create",
-          thread: "thread:title:landing",
-        });
-        yield* dispatchUserMessage({
-          command: "command:title:landing:message",
-          threadId,
-          text: "Investigate the flaky login test",
-        });
-        const requestId = yield* armRegeneration({ command: "command:title:landing:1", threadId });
+        const cases = [
+          { name: "removed", worktreePath: "/repo-worktrees/removed-by-cleanup", cwd: "/repo" },
+          { name: "existing", worktreePath: existingWorktree, cwd: existingWorktree },
+        ];
+        for (const [index, testCase] of cases.entries()) {
+          const threadId = yield* createThread({
+            command: `command:title:landing:${testCase.name}:create`,
+            thread: `thread:title:landing:${testCase.name}`,
+            worktreePath: testCase.worktreePath,
+          });
+          yield* dispatchUserMessage({
+            command: `command:title:landing:${testCase.name}:message`,
+            threadId,
+            text: "Investigate the flaky login test",
+          });
+          const requestId = yield* armRegeneration({
+            command: `command:title:landing:${testCase.name}:1`,
+            threadId,
+          });
 
-        yield* titleRegeneration.execute({ threadId, requestId, kind: { type: "regenerate" } });
+          yield* titleRegeneration.execute({ threadId, requestId, kind: { type: "regenerate" } });
 
-        const call = harness.generateThreadTitle.mock.calls[0]?.[0];
-        assert.equal(call?.previousTitle, "Seed title");
-        assert.equal(call?.cwd, "/repo");
-        assert.include(call?.message, "USER:\nInvestigate the flaky login test");
-        const projection = yield* threads.getThreadProjection(threadId);
-        assert.equal(projection.thread.title, "Fresh title");
-        assert.isNotOk(projection.thread.titleRegeneration);
+          const call = harness.generateThreadTitle.mock.calls[index]?.[0];
+          assert.equal(call?.previousTitle, "Seed title");
+          assert.equal(call?.cwd, testCase.cwd);
+          assert.include(call?.message, "USER:\nInvestigate the flaky login test");
+          const projection = yield* threads.getThreadProjection(threadId);
+          assert.equal(projection.thread.title, "Fresh title");
+          assert.isNotOk(projection.thread.titleRegeneration);
+        }
       }).pipe(Effect.provide(harness.layer));
-    }),
+    }).pipe(Effect.provide(NodeServices.layer)),
   );
 
   it.effect("titles a fork's first message with the source history up to the fork point", () =>
diff --git a/apps/server/src/orchestration-v2/ThreadTitleRegenerationService.ts b/apps/server/src/orchestration-v2/ThreadTitleRegenerationService.ts
index 601b783675d0e..6c80def39059f 100644
--- a/apps/server/src/orchestration-v2/ThreadTitleRegenerationService.ts
+++ b/apps/server/src/orchestration-v2/ThreadTitleRegenerationService.ts
@@ -13,6 +13,7 @@ import {
 import * as Cause from "effect/Cause";
 import * as Context from "effect/Context";
 import * as Effect from "effect/Effect";
+import * as FileSystem from "effect/FileSystem";
 import * as Layer from "effect/Layer";
 import * as Option from "effect/Option";
 import * as Schedule from "effect/Schedule";
@@ -50,6 +51,7 @@ const make = Effect.gen(function* () {
   const projects = yield* ProjectStore.ProjectStoreV2;
   const serverSettings = yield* ServerSettings.ServerSettingsService;
   const textGeneration = yield* TextGeneration.TextGeneration;
+  const fileSystem = yield* FileSystem.FileSystem;
 
   const complete = (input: {
     readonly threadId: ThreadId;
@@ -160,8 +162,13 @@ const make = Effect.gen(function* () {
         yield* serverSettings.getSettings,
         projection.thread.projectId,
       ).settings;
+      // Storage cleanup removes worktrees but keeps the path; CLIs cannot spawn in a missing cwd.
+      const worktreePath = projection.thread.worktreePath;
+      const worktreeExists =
+        worktreePath !== null &&
+        (yield* fileSystem.exists(worktreePath).pipe(Effect.orElseSucceed(() => false)));
       const result = yield* textGeneration.generateThreadTitle({
-        cwd: projection.thread.worktreePath ?? project.value.workspaceRoot,
+        cwd: worktreeExists ? worktreePath : project.value.workspaceRoot,
         message: context.message,
         attachments: context.attachments,
         ...(input.kind.type === "regenerate" ? { previousTitle: projection.thread.title } : {}),