diff --git a/.changeset/onepassword-service-account-token-lifetime.md b/.changeset/onepassword-service-account-token-lifetime.md
new file mode 100644
index 0000000000..f389a856ed
--- /dev/null
+++ b/.changeset/onepassword-service-account-token-lifetime.md
@@ -0,0 +1,11 @@
+---
+"executor": patch
+---
+
+**The 1Password service-account token is cleared from the op-js global after each call**
+
+`@1password/op-js` keeps the service-account token on a module-level CLI instance (`cli.serviceAccountToken`) and reads it when it spawns `op`. The CLI backend set that global before each call and never cleared it, so one reachable reference to the token stayed live for the rest of the process.
+
+It is now cleared as soon as the call that needed it is done, on success, failure and interruption alike. Authentication is unaffected: every read and write of that global already happens inside the backend's semaphore, so the next operation re-sets the token before it spawns anything.
+
+This is hygiene rather than a boundary change. No unrelated `op` child ever received a stale token — every call routes through the same critical section that sets the correct one immediately before invoking — and the token is separately persisted in plaintext in the plugin's config blob, so an attacker's reach is unchanged. What it removes is a long-lived reachable reference that nothing needed to keep.
diff --git a/packages/plugins/onepassword/src/sdk/service.test.ts b/packages/plugins/onepassword/src/sdk/service.test.ts
index 3ee24dc8c6..6ae90199e0 100644
--- a/packages/plugins/onepassword/src/sdk/service.test.ts
+++ b/packages/plugins/onepassword/src/sdk/service.test.ts
@@ -132,4 +132,67 @@ describe("makeOnePasswordService", () => {
       // oxlint-enable executor/no-unknown-error-message
     }),
   );
+
+  // -------------------------------------------------------------------------
+  // Service-account token lifetime.
+  //
+  // `op-js` parks the token on a process-global (`cli.serviceAccountToken`) and
+  // reads it when spawning `op`. Nothing in the library clears it, so without
+  // the `ensuring` in `makeCliService` a token set to serve one resolve stays
+  // readable for the rest of the process's life.
+  //
+  // Both halves are pinned on purpose: clearing it is only correct if it is
+  // still SET while the call runs. A change that cleared it too early would
+  // pass a "no longer parked" assertion and silently break authentication.
+  // -------------------------------------------------------------------------
+
+  it.effect("clears the service-account token from the op-js global after a CLI call", () =>
+    Effect.gen(function* () {
+      opMocks.readParse.mockReturnValue("resolved-secret");
+
+      const service = yield* makeOnePasswordService(
+        { kind: "service-account", token: "ops_test_token" },
+        { timeoutMs: 1_000 },
+      );
+      const secret = yield* service.resolveSecret("op://vault/item/field");
+
+      expect(secret).toBe("resolved-secret");
+      // Still handed to the CLI for the call that needed it...
+      expect(opMocks.setServiceAccount).toHaveBeenCalledWith("ops_test_token");
+      // ...and gone by the time the call is over.
+      expect(opMocks.setServiceAccount).toHaveBeenLastCalledWith("");
+    }),
+  );
+
+  it.effect("clears the token even when the CLI call fails", () =>
+    Effect.gen(function* () {
+      // The failure path is the one that matters most: an error unwinding past a
+      // manual "clear it afterwards" line is exactly how a token gets stranded.
+      opMocks.readParse.mockImplementation(() => {
+        // oxlint-disable-next-line executor/no-try-catch-or-throw, executor/no-error-constructor -- boundary: simulates the untyped op-js CLI wrapper throwing
+        throw new Error("spawn op ENOENT");
+      });
+      sdkMocks.createClient.mockResolvedValue({
+        secrets: {
+          resolve: vi.fn(async () => {
+            // oxlint-disable-next-line executor/no-try-catch-or-throw, executor/no-error-constructor -- boundary: simulates the untyped 1Password SDK rejecting
+            throw new Error("sdk unavailable");
+          }),
+        },
+        vaults: { list: vi.fn(async () => []) },
+        items: { list: vi.fn(async () => []) },
+      });
+
+      yield* makeOnePasswordService(
+        { kind: "service-account", token: "ops_test_token" },
+        { timeoutMs: 1_000 },
+      ).pipe(
+        Effect.flatMap((service) => service.resolveSecret("op://vault/item/field")),
+        Effect.flip,
+      );
+
+      expect(opMocks.setServiceAccount).toHaveBeenCalledWith("ops_test_token");
+      expect(opMocks.setServiceAccount).toHaveBeenLastCalledWith("");
+    }),
+  );
 });
diff --git a/packages/plugins/onepassword/src/sdk/service.ts b/packages/plugins/onepassword/src/sdk/service.ts
index 19ff6b4f8e..bf725c1b6c 100644
--- a/packages/plugins/onepassword/src/sdk/service.ts
+++ b/packages/plugins/onepassword/src/sdk/service.ts
@@ -203,7 +203,22 @@ export const makeCliService = (
                 operation,
                 message: messageWithCause(`1Password CLI ${operation} failed`, cause),
               }),
-          }),
+          }).pipe(
+            // `op-js` keeps the service-account token in a PROCESS-GLOBAL
+            // (`cli.serviceAccountToken`, a field on the module's single CLI
+            // instance) and reads it when spawning `op`. Nothing in the library
+            // clears it, so a token set to serve one resolve stayed readable for
+            // the rest of the executor's life — long after the call that needed
+            // it, and with no reader. The account-name branch above happens to
+            // blank it, but only if a differently-authenticated call comes next,
+            // which in a service-account-only deployment never happens.
+            //
+            // So clear it as soon as the call is done: on success, on failure and
+            // on interruption alike. Safe because every write and every read of
+            // that global happens inside this same semaphore, so the next
+            // operation re-sets the token before it spawns anything.
+            Effect.ensuring(Effect.sync(() => op.setServiceAccount(""))),
+          ),
         )
         .pipe(Effect.withSpan(`onepassword.cli.${operation}`));