diff --git a/apps/server/src/orchestration/Layers/ProviderCommandReactor.test.ts b/apps/server/src/orchestration/Layers/ProviderCommandReactor.test.ts
index 8072e88b58f6..44bbd41352bc 100644
--- a/apps/server/src/orchestration/Layers/ProviderCommandReactor.test.ts
+++ b/apps/server/src/orchestration/Layers/ProviderCommandReactor.test.ts
@@ -73,6 +73,7 @@ import { OrchestrationEngineService } from "../Services/OrchestrationEngine.ts";
 import { ProviderCommandReactor } from "../Services/ProviderCommandReactor.ts";
 import { ProjectionSnapshotQuery } from "../Services/ProjectionSnapshotQuery.ts";
 import * as NodeServices from "@effect/platform-node/NodeServices";
+import { withWorkspaceLease } from "../../workspace/workspaceLease.ts";
 import * as Clock from "effect/Clock";
 import { ServerSettingsService } from "../../serverSettings.ts";
 import { ServerActivation } from "../../serverActivation.ts";
@@ -432,7 +433,13 @@ describe("ProviderCommandReactor", () => {
           },
         }),
     );
-    const runSetupScript = vi.fn(() => Effect.succeed({ status: "no-script" as const }));
+    // The real runner opens a terminal, which takes the worktree's workspace lease.
+    const runSetupScript = vi.fn((input: { readonly worktreePath: string }) =>
+      withWorkspaceLease(
+        NodePath.resolve(input.worktreePath),
+        Effect.succeed({ status: "no-script" as const }),
+      ),
+    );
     const pruneWorktrees = vi.fn((_: { readonly cwd: string }) => Effect.void);
     const refreshStatus = vi.fn((_: string) =>
       Effect.succeed({
diff --git a/apps/server/src/orchestration/Layers/ProviderCommandReactor.ts b/apps/server/src/orchestration/Layers/ProviderCommandReactor.ts
index fa95d2f765ac..5da70c802710 100644
--- a/apps/server/src/orchestration/Layers/ProviderCommandReactor.ts
+++ b/apps/server/src/orchestration/Layers/ProviderCommandReactor.ts
@@ -668,12 +668,28 @@ const make = Effect.gen(function* () {
       cwd: managedWorktree.projectCwd,
       ...recoveryPlan,
     });
-    yield* projectSetupScriptRunner.runForThread({
-      threadId: input.thread.id,
-      projectId: input.thread.projectId,
-      projectCwd: managedWorktree.projectCwd,
-      worktreePath: managedWorktree.path,
-    });
+    // Opening the setup terminal takes this worktree's workspace lease, which
+    // the turn start already holds. Fork so it queues behind the turn start
+    // instead of deadlocking on it.
+    yield* projectSetupScriptRunner
+      .runForThread({
+        threadId: input.thread.id,
+        projectId: input.thread.projectId,
+        projectCwd: managedWorktree.projectCwd,
+        worktreePath: managedWorktree.path,
+      })
+      .pipe(
+        Effect.catchCause((cause) =>
+          Cause.hasInterruptsOnly(cause)
+            ? Effect.void
+            : Effect.logWarning("failed to run setup script for recreated worktree", {
+                threadId: input.thread.id,
+                worktreePath: managedWorktree.path,
+                cause: Cause.pretty(cause),
+              }),
+        ),
+        Effect.forkScoped,
+      );
     yield* Effect.logInfo("recreated missing managed thread worktree", {
       threadId: input.thread.id,
       branch: input.thread.branch,