diff --git a/scripts/run-node.d.mts b/scripts/run-node.d.mts
index eab53d43c61..34e48d847db 100644
--- a/scripts/run-node.d.mts
+++ b/scripts/run-node.d.mts
@@ -13,6 +13,15 @@ export function resolveBuildRequirement(deps: {
   configFiles: string[];
 }): { shouldBuild: boolean; reason: string };
 
+export function acquireRunNodeBuildLock(deps: {
+  cwd: string;
+  args: readonly string[];
+  env: NodeJS.ProcessEnv;
+  fs: unknown;
+  process: NodeJS.Process;
+  stderr: { write: (value: string) => void };
+}): Promise<() => void>;
+
 export function runNodeMain(params?: {
   spawn?: (
     cmd: string,
diff --git a/scripts/run-node.mjs b/scripts/run-node.mjs
index d6543311735..286c582e23a 100644
--- a/scripts/run-node.mjs
+++ b/scripts/run-node.mjs
@@ -459,7 +459,7 @@ const removeStaleBuildLock = (deps, lockDir, staleMs) => {
   }
 };
 
-const acquireRunNodeBuildLock = async (deps) => {
+export const acquireRunNodeBuildLock = async (deps) => {
   const lockRoot = path.join(deps.cwd, ".artifacts");
   const lockDir = path.join(lockRoot, "run-node-build.lock");
   const timeoutMs = parsePositiveIntegerEnv(
@@ -501,8 +501,29 @@ const acquireRunNodeBuildLock = async (deps) => {
       } catch {
         // Owner metadata is diagnostic only; the directory itself is the lock.
       }
+      let released = false;
+      const removeLockDir = () => {
+        if (released) {
+          return;
+        }
+        released = true;
+        try {
+          deps.fs.rmSync(lockDir, { recursive: true, force: true });
+        } catch {
+          // Best-effort cleanup; a follow-up waiter will fall back to staleness
+          // detection if the directory is still present.
+        }
+      };
+      const onSignal = () => removeLockDir();
+      const onExit = () => removeLockDir();
+      deps.process.on("SIGINT", onSignal);
+      deps.process.on("SIGTERM", onSignal);
+      deps.process.on("exit", onExit);
       return () => {
-        deps.fs.rmSync(lockDir, { recursive: true, force: true });
+        deps.process.off("SIGINT", onSignal);
+        deps.process.off("SIGTERM", onSignal);
+        deps.process.off("exit", onExit);
+        removeLockDir();
       };
     } catch (error) {
       if (error?.code !== "EEXIST") {
diff --git a/src/infra/run-node.test.ts b/src/infra/run-node.test.ts
index 0af519bda88..60e03daeeaf 100644
--- a/src/infra/run-node.test.ts
+++ b/src/infra/run-node.test.ts
@@ -3,7 +3,11 @@ import fsSync from "node:fs";
 import fs from "node:fs/promises";
 import path from "node:path";
 import { describe, expect, it, vi } from "vitest";
-import { resolveBuildRequirement, runNodeMain } from "../../scripts/run-node.mjs";
+import {
+  acquireRunNodeBuildLock,
+  resolveBuildRequirement,
+  runNodeMain,
+} from "../../scripts/run-node.mjs";
 import {
   bundledDistPluginFile,
   bundledPluginFile,
@@ -1071,4 +1075,80 @@ describe("run-node script", () => {
       expect(spawnCalls).toEqual([expectedBuildSpawn(), statusCommandSpawn()]);
     });
   });
+
+  describe("acquireRunNodeBuildLock", () => {
+    const lockDeps = (tmp: string, fakeProcess: NodeJS.Process) => ({
+      cwd: tmp,
+      args: ["status"],
+      env: { OPENCLAW_RUNNER_LOG: "0" },
+      fs: fsSync,
+      process: fakeProcess,
+      stderr: { write: () => true } as unknown as NodeJS.WriteStream,
+    });
+
+    it("releases the lock directory when the wrapper receives SIGINT", async () => {
+      await withTempDir({ prefix: "openclaw-run-node-" }, async (tmp) => {
+        const fakeProcess = createFakeProcess();
+        const lockDir = path.join(tmp, ".artifacts", "run-node-build.lock");
+
+        const release = await acquireRunNodeBuildLock(lockDeps(tmp, fakeProcess));
+        expect(fsSync.existsSync(lockDir)).toBe(true);
+
+        fakeProcess.emit("SIGINT");
+        expect(fsSync.existsSync(lockDir)).toBe(false);
+
+        // Normal release after signal must be a no-op, not throw.
+        expect(() => release()).not.toThrow();
+        expect(fakeProcess.listenerCount("SIGINT")).toBe(0);
+        expect(fakeProcess.listenerCount("SIGTERM")).toBe(0);
+        expect(fakeProcess.listenerCount("exit")).toBe(0);
+      });
+    });
+
+    it("releases the lock directory when the wrapper receives SIGTERM", async () => {
+      await withTempDir({ prefix: "openclaw-run-node-" }, async (tmp) => {
+        const fakeProcess = createFakeProcess();
+        const lockDir = path.join(tmp, ".artifacts", "run-node-build.lock");
+
+        const release = await acquireRunNodeBuildLock(lockDeps(tmp, fakeProcess));
+        expect(fsSync.existsSync(lockDir)).toBe(true);
+
+        fakeProcess.emit("SIGTERM");
+        expect(fsSync.existsSync(lockDir)).toBe(false);
+        expect(() => release()).not.toThrow();
+      });
+    });
+
+    it("releases the lock directory on process exit", async () => {
+      await withTempDir({ prefix: "openclaw-run-node-" }, async (tmp) => {
+        const fakeProcess = createFakeProcess();
+        const lockDir = path.join(tmp, ".artifacts", "run-node-build.lock");
+
+        const release = await acquireRunNodeBuildLock(lockDeps(tmp, fakeProcess));
+        expect(fsSync.existsSync(lockDir)).toBe(true);
+
+        fakeProcess.emit("exit");
+        expect(fsSync.existsSync(lockDir)).toBe(false);
+        expect(() => release()).not.toThrow();
+      });
+    });
+
+    it("detaches signal listeners after a normal release", async () => {
+      await withTempDir({ prefix: "openclaw-run-node-" }, async (tmp) => {
+        const fakeProcess = createFakeProcess();
+        const lockDir = path.join(tmp, ".artifacts", "run-node-build.lock");
+
+        const release = await acquireRunNodeBuildLock(lockDeps(tmp, fakeProcess));
+        expect(fakeProcess.listenerCount("SIGINT")).toBe(1);
+        expect(fakeProcess.listenerCount("SIGTERM")).toBe(1);
+        expect(fakeProcess.listenerCount("exit")).toBe(1);
+
+        release();
+        expect(fsSync.existsSync(lockDir)).toBe(false);
+        expect(fakeProcess.listenerCount("SIGINT")).toBe(0);
+        expect(fakeProcess.listenerCount("SIGTERM")).toBe(0);
+        expect(fakeProcess.listenerCount("exit")).toBe(0);
+      });
+    });
+  });
 });