diff --git a/src/node-host/runtime.computer.test.ts b/src/node-host/runtime.computer.test.ts
index 58ef558bb716..0ff1e1c1e376 100644
--- a/src/node-host/runtime.computer.test.ts
+++ b/src/node-host/runtime.computer.test.ts
@@ -120,6 +120,45 @@ async function startComputer(ephemeral = true, prepare?: () => Promise<void>) {
 }
 
 describe("private worker computer runtime", () => {
+  it("joins watcher and disconnect cleanup until physical computer close settles", async () => {
+    const host = await startComputer();
+    const physicalClose = createDeferredCore();
+    let physicalCloseFinished = false;
+    host.close.mockImplementationOnce(async () => {
+      await physicalClose.promise;
+      physicalCloseFinished = true;
+    });
+    let closing: Promise<void> | undefined;
+    try {
+      expect(
+        await host.invoke({
+          operation: "snapshot",
+          providerGeneration: descriptor.provider.generation,
+          params: { executionId },
+        }),
+      ).toMatchObject({ ok: true });
+      let closed = false;
+      closing = host.runtime.close().then(() => {
+        closed = true;
+      });
+      await vi.waitFor(() => expect(host.close).toHaveBeenCalledOnce());
+      await new Promise<void>((resolve) => {
+        setImmediate(resolve);
+      });
+      expect(physicalCloseFinished).toBe(false);
+      expect(closed).toBe(false);
+
+      physicalClose.resolve();
+      await closing;
+      expect(physicalCloseFinished).toBe(true);
+      expect(host.close).toHaveBeenCalledOnce();
+    } finally {
+      physicalClose.resolve();
+      await closing;
+      await host.runtime.close();
+    }
+  });
+
   it("awaits the registered provider preparation before publishing the first manifest", async () => {
     const gate = createDeferredCore();
     const prepare = vi.fn(() => gate.promise);
diff --git a/src/plugins/computer-use-contract.test.ts b/src/plugins/computer-use-contract.test.ts
index 5fd7f7a2da6a..e5e85f2d6cd8 100644
--- a/src/plugins/computer-use-contract.test.ts
+++ b/src/plugins/computer-use-contract.test.ts
@@ -1,5 +1,6 @@
 import { readFileSync } from "node:fs";
 import { describe, expect, it, vi } from "vitest";
+import { createDeferredCore } from "../shared/deferred.js";
 import {
   COMPUTER_STALE_OBSERVATION,
   COMPUTER_USE_V2_ACTION_NAMES,
@@ -289,6 +290,166 @@ describe("Computer Use wire contract", () => {
 });
 
 describe("Computer Use provider registration", () => {
+  it.each(["same", "different", "same-close", "different-close"] as const)(
+    "preserves queued acquisition and close order for %s",
+    async (laterOwner) => {
+      const firstId = "123e4567-e89b-42d3-a456-426614174000";
+      const nextId = "223e4567-e89b-42d3-a456-426614174000";
+      const laterId = laterOwner.startsWith("same")
+        ? nextId
+        : "323e4567-e89b-42d3-a456-426614174000";
+      const closeLater = laterOwner.endsWith("-close");
+      const commands: OpenClawPluginNodeHostCommand[] = [];
+      const firstClose = createDeferredCore();
+      const nextClose = createDeferredCore();
+      const close = vi
+        .fn(async () => {})
+        .mockImplementationOnce(() => firstClose.promise)
+        .mockImplementationOnce(() => nextClose.promise);
+      const openExecution = vi.fn(async () => ({
+        snapshot: async () => "snapshot",
+        act: async () => "act",
+        close,
+      }));
+      registerComputerUseProvider(
+        { registerNodeHostCommand: (command) => commands.push(command) },
+        {
+          id: "fixture",
+          label: "Fixture",
+          capabilities: () => ({
+            contractVersion: 2,
+            provider: { id: "fixture", label: "Fixture", generation: "generation-1" },
+            actions: ["screenshot"],
+            targets: ["screen"],
+            deliveryModes: ["foreground"],
+            observations: ["image"],
+            features: { recording: false, agentCursor: false, multiDisplay: false },
+          }),
+          isAvailable: () => true,
+          openExecution,
+        },
+      );
+      const snapshot = commands[0]!;
+      const computer = commands[1]!;
+      await snapshot.handle(JSON.stringify({ executionId: firstId }));
+      const retiringFirst = computer.handle(
+        JSON.stringify({ executionId: firstId, action: "__close_execution" }),
+      );
+      const openingNext = snapshot.handle(JSON.stringify({ executionId: nextId }));
+      const retiringNext = computer.handle(
+        JSON.stringify({ executionId: nextId, action: "__close_execution" }),
+      );
+      const laterSnapshot = snapshot.handle(JSON.stringify({ executionId: laterId }));
+      const retiringLater = closeLater
+        ? computer.handle(JSON.stringify({ executionId: laterId, action: "__close_execution" }))
+        : undefined;
+      const laterSettled = vi.fn();
+      const observedLater = laterSnapshot.then(laterSettled, laterSettled);
+      const laterCloseSettled = vi.fn();
+      const observedLaterClose = retiringLater?.then(laterCloseSettled, laterCloseSettled);
+      const operations = Promise.allSettled([
+        retiringFirst,
+        openingNext,
+        retiringNext,
+        laterSnapshot,
+        ...(retiringLater ? [retiringLater] : []),
+      ]);
+      try {
+        firstClose.resolve();
+        await new Promise<void>((resolve) => {
+          setImmediate(resolve);
+        });
+        expect(openExecution).toHaveBeenCalledTimes(2);
+        expect(close).toHaveBeenCalledTimes(2);
+        expect(laterSettled).not.toHaveBeenCalled();
+        expect(laterCloseSettled).not.toHaveBeenCalled();
+        nextClose.resolve();
+        expect(await operations).toEqual([
+          { status: "fulfilled", value: '{"ok":true}' },
+          { status: "fulfilled", value: "snapshot" },
+          { status: "fulfilled", value: '{"ok":true}' },
+          { status: "fulfilled", value: "snapshot" },
+          ...(closeLater ? [{ status: "fulfilled", value: '{"ok":true}' }] : []),
+        ]);
+        expect(openExecution).toHaveBeenCalledTimes(3);
+        expect(close).toHaveBeenCalledTimes(closeLater ? 3 : 2);
+      } finally {
+        firstClose.resolve();
+        nextClose.resolve();
+        await operations;
+        await observedLater;
+        await observedLaterClose;
+        await snapshot.onDisconnect?.();
+      }
+    },
+  );
+
+  it("retains terminal close failure without confusing it with failed-open recovery", async () => {
+    const executionId = "123e4567-e89b-42d3-a456-426614174000";
+    const otherId = "223e4567-e89b-42d3-a456-426614174000";
+    const commands: OpenClawPluginNodeHostCommand[] = [];
+    const openFailure = new Error("native driver startup failed");
+    const closeFailure = new Error("native driver shutdown failed");
+    const failedOpening =
+      createDeferredCore<Awaited<ReturnType<ComputerUseProvider["openExecution"]>>>();
+    const physicalClose = vi.fn(async () => {
+      throw closeFailure;
+    });
+    let terminalClose: Promise<void> | undefined;
+    const close = vi.fn(() => (terminalClose ??= physicalClose()));
+    const openExecution = vi
+      .fn<ComputerUseProvider["openExecution"]>(async () => ({
+        snapshot: async () => "snapshot",
+        act: async () => "act",
+        close,
+      }))
+      .mockImplementationOnce(() => failedOpening.promise);
+    registerComputerUseProvider(
+      { registerNodeHostCommand: (command) => commands.push(command) },
+      {
+        id: "fixture",
+        label: "Fixture",
+        capabilities: () => ({
+          contractVersion: 2,
+          provider: { id: "fixture", label: "Fixture", generation: "generation-1" },
+          actions: ["screenshot"],
+          targets: ["screen"],
+          deliveryModes: ["foreground"],
+          observations: ["image"],
+          features: { recording: false, agentCursor: false, multiDisplay: false },
+        }),
+        isAvailable: () => true,
+        openExecution,
+      },
+    );
+    const snapshot = commands[0]!;
+    const computer = commands[1]!;
+    const params = JSON.stringify({ executionId });
+    const closeParams = JSON.stringify({ executionId, action: "__close_execution" });
+    const opening = snapshot.handle(params);
+    const closingFailedOpen = computer.handle(closeParams);
+    const failedOpenResults = Promise.allSettled([opening, closingFailedOpen]);
+    failedOpening.reject(openFailure);
+    expect(await failedOpenResults).toEqual([
+      { status: "rejected", reason: openFailure },
+      { status: "rejected", reason: openFailure },
+    ]);
+    await expect(snapshot.handle(params)).resolves.toBe("snapshot");
+    await expect(computer.handle(closeParams)).rejects.toBe(closeFailure);
+    await expect(
+      computer.handle(JSON.stringify({ executionId: otherId, action: "__close_execution" })),
+    ).resolves.toBe('{"ok":true}');
+    expect(close).toHaveBeenCalledOnce();
+
+    await expect(computer.handle(closeParams)).rejects.toBe(closeFailure);
+    await expect(snapshot.handle(JSON.stringify({ executionId: otherId }))).rejects.toBe(
+      closeFailure,
+    );
+    expect(openExecution).toHaveBeenCalledTimes(2);
+    expect(close).toHaveBeenCalledTimes(2);
+    expect(physicalClose).toHaveBeenCalledOnce();
+  });
+
   it("registers one command pair and dispatches both through one execution", async () => {
     const executionId = "123e4567-e89b-42d3-a456-426614174000";
     const commands: OpenClawPluginNodeHostCommand[] = [];
diff --git a/src/plugins/computer-use-contract.ts b/src/plugins/computer-use-contract.ts
index 2da9014d6ff0..58c7f72cc5df 100644
--- a/src/plugins/computer-use-contract.ts
+++ b/src/plugins/computer-use-contract.ts
@@ -569,7 +569,8 @@ export function registerComputerUseProvider(
   provider: ComputerUseProvider,
 ): void {
   let execution: { id: string; promise: Promise<ComputerUseExecution> } | undefined;
-  let closingPromise: Promise<void> = Promise.resolve();
+  let closingPromise: Promise<void> | undefined;
+  let pendingClose: Promise<void> | undefined;
 
   const executionEnvelopeFromParams = (paramsJSON: string | null | undefined) => {
     let value: unknown;
@@ -601,7 +602,10 @@ export function registerComputerUseProvider(
     if (!executionId) {
       throw new Error("COMPUTER_INVALID_REQUEST: executionId is required");
     }
-    await closingPromise;
+    // An earlier queued close can replace the barrier while this acquisition resumes.
+    for (let barrier = closingPromise; barrier !== undefined; barrier = closingPromise) {
+      await barrier;
+    }
     if (execution && execution.id !== executionId) {
       throw new Error("COMPUTER_HOST_BUSY: another provider execution owns this computer");
     }
@@ -620,18 +624,61 @@ export function registerComputerUseProvider(
     }
     return execution.promise;
   };
-  const closeExecution = async (executionId: string | undefined, reason: string) => {
-    await closingPromise;
+  const closeCurrentExecution = (
+    executionId: string | undefined,
+    reason: string,
+  ): Promise<void> => {
     const current = execution;
     if (!current || (executionId !== undefined && current.id !== executionId)) {
-      return;
+      return Promise.resolve();
     }
-    execution = undefined;
-    if (current) {
-      const close = current.promise.then(async (opened) => await opened.close(reason));
-      closingPromise = close.catch(() => {});
-      await close;
+    if (pendingClose) {
+      return pendingClose;
     }
+    // Watcher stop and disconnect must join the same physical close before either yields.
+    const close = current.promise.then(async (opened) => await opened.close(reason));
+    pendingClose = close;
+    closingPromise = close;
+    void close.then(
+      () => {
+        if (execution === current) {
+          execution = undefined;
+        }
+        pendingClose = undefined;
+        closingPromise = undefined;
+      },
+      () => {
+        pendingClose = undefined;
+        // Failed open owns nothing; failed physical close stays owned for an explicit close.
+        if (execution !== current) {
+          closingPromise = undefined;
+        }
+      },
+    );
+    return close;
+  };
+  const closeExecution = (executionId: string | undefined, reason: string): Promise<void> => {
+    if (!pendingClose) {
+      return closeCurrentExecution(executionId, reason);
+    }
+    const joined = (async () => {
+      // Earlier queued operations can publish another close after each barrier settles.
+      for (let barrier = pendingClose; barrier !== undefined; barrier = pendingClose) {
+        const matchesClosingOwner = executionId === undefined || execution?.id === executionId;
+        try {
+          await barrier;
+        } catch (error) {
+          if (matchesClosingOwner) {
+            throw error;
+          }
+          return;
+        }
+      }
+      await closeCurrentExecution(executionId, reason);
+    })();
+    // Watcher cleanup may initiate an unawaited close; joiners still receive the actual failure.
+    void joined.catch(() => {});
+    return joined;
   };
 
   api.registerNodeHostCommand({