diff --git a/packages/codemode/CHANGELOG.md b/packages/codemode/CHANGELOG.md
index 938d6400e..8e7e6798d 100644
--- a/packages/codemode/CHANGELOG.md
+++ b/packages/codemode/CHANGELOG.md
@@ -12,6 +12,10 @@
 
 - The VM now polls for interrupts while it drains promise jobs, so a script such as `while (true) await null` is stopped at the same points as a synchronous loop
 
+### Fixed
+
+- Fixed `CodemodeSandbox` failing with a broken bridge error when the host runs under `node --watch` on Node 24 or 26, which posts `watch:import`/`watch:require` messages on the worker channel ([#10725](https://github.com/earendil-works/pi/issues/10725))
+
 ## [1.1.0] - 2026-10-07
 
 ### Added
diff --git a/packages/codemode/src/runtime/host.ts b/packages/codemode/src/runtime/host.ts
index c618b07a2..70e44963d 100644
--- a/packages/codemode/src/runtime/host.ts
+++ b/packages/codemode/src/runtime/host.ts
@@ -35,7 +35,16 @@ function workerLauncher(
 		} catch (error) {
 			throw new Error(`Failed to start worker: ${errorMessage(error)}`);
 		}
-		worker.on("message", (message: unknown) => events.message(message));
+		worker.on("message", (message: unknown) => {
+			// Node 24/26 --watch leaks dependency reports onto the worker channel (nodejs/node#65044).
+			if (
+				typeof message === "object" &&
+				message !== null &&
+				("watch:import" in message || "watch:require" in message)
+			)
+				return;
+			events.message(message);
+		});
 		worker.on("error", (error: unknown) => {
 			events.failure({
 				kind: "sandbox",
diff --git a/packages/codemode/test/fixtures/raw-worker.ts b/packages/codemode/test/fixtures/raw-worker.ts
index dacf83836..6e617f247 100644
--- a/packages/codemode/test/fixtures/raw-worker.ts
+++ b/packages/codemode/test/fixtures/raw-worker.ts
@@ -1,7 +1,8 @@
 /**
- * Stands in for the real worker in host tests: posts the JSON message passed as the script source,
- * so tests can send the host payloads the real prelude never produces.
+ * Stands in for the real worker in host tests: posts the JSON message (or array of messages) passed
+ * as the script source, so tests can send the host payloads the real prelude never produces.
  */
 import { parentPort, workerData } from "node:worker_threads";
 
-parentPort?.postMessage(JSON.parse((workerData as { code: string }).code));
+const messages: unknown = JSON.parse((workerData as { code: string }).code);
+for (const message of Array.isArray(messages) ? messages : [messages]) parentPort?.postMessage(message);
diff --git a/packages/codemode/test/sandbox.test.ts b/packages/codemode/test/sandbox.test.ts
index ed45c8d4e..0181457ab 100644
--- a/packages/codemode/test/sandbox.test.ts
+++ b/packages/codemode/test/sandbox.test.ts
@@ -835,6 +835,20 @@ describe("worker host", () => {
 		});
 	});
 
+	// #10725: Node 24/26 `--watch` posts dependency reports on the worker channel.
+	it("ignores Node --watch notifications from the worker", async () => {
+		const sandbox = new CodemodeSandbox({ workerUrl: new URL("./fixtures/raw-worker.ts", import.meta.url) });
+		sandboxes.push(sandbox);
+		const result = await sandbox.execute(
+			JSON.stringify([
+				{ "watch:require": ["/worker.js"] },
+				{ "watch:import": ["file:///worker.js"] },
+				{ type: "done", ok: true, value: "42", writes: "[]" },
+			]),
+		);
+		expect(result).toMatchObject({ ok: true, value: 42 });
+	});
+
 	// #10444: a malformed payload from the worker must fail the run as a sandbox error instead of
 	// throwing in the host's message listener and never settling.
 	it.each([