diff --git a/core/providers/onnx.js b/core/providers/onnx.js
index 8ce9a36..030a641 100644
--- a/core/providers/onnx.js
+++ b/core/providers/onnx.js
@@ -52,18 +52,18 @@ export async function unload() {
   generator = null; cargadoKey = null;
 }
 
-export async function chat(history, system, onToken = () => {}) {
+export async function chat(history, system, onToken = () => {}, signal = null) {
   if (!generator) throw new Error('Modelo no cargado');
   // ACE-lite: eviction por relevancia. Presupuesto amplio (LFM2.5 aguanta
   // contexto largo); el tope POR MENSAJE (context.js) evita que un README
   // gigante dispare «Too many tokens requested».
   const messages = [{ role: 'system', content: system }, ...(await packHistoryAsync(history, 5000))];
-  const streamer = new TextStreamer(generator.tokenizer, {
+  const streamer = new TextStreamer(generator.tokenizer, { signal, 
     skip_prompt: true,
     skip_special_tokens: true,
     callback_function: onToken,
   });
-  const out = await generator(messages, {
+  const out = await generator(messages, { signal, 
     max_new_tokens: 1024,
     do_sample: false,          // determinista: los tool calls JSON lo agradecen
     repetition_penalty: 1.1,
diff --git a/tests/acceptance/4/CRITERIA.json b/tests/acceptance/4/CRITERIA.json
new file mode 100644
index 0000000..3a97ed5
--- /dev/null
+++ b/tests/acceptance/4/CRITERIA.json
@@ -0,0 +1,18 @@
+{
+  "schema": "elffuss-t2t/criteria@2",
+  "issue": 4,
+  "criteria": [
+    {
+      "index": 1,
+      "tests": [
+        "tests/acceptance/4/criteria.test.js::criterion 1"
+      ]
+    },
+    {
+      "index": 2,
+      "tests": [
+        "tests/acceptance/4/criteria.test.js::criterion 2"
+      ]
+    }
+  ]
+}
diff --git a/tests/acceptance/4/criteria.test.js b/tests/acceptance/4/criteria.test.js
new file mode 100644
index 0000000..b98a05b
--- /dev/null
+++ b/tests/acceptance/4/criteria.test.js
@@ -0,0 +1,28 @@
+import { test } from 'node:test'
+import assert from 'node:assert/strict'
+import { readFileSync } from 'node:fs'
+import * as mod from '../../../core/providers/onnx.js' // the code under test: call it as mod.<name>(...)
+const source = readFileSync(new URL('../../../core/providers/onnx.js', import.meta.url), 'utf8') // the text of core/providers/onnx.js, for a criterion about how the file is written
+
+test('criterion 1', () => {
+  // The `chat` function of core/providers/onnx.js declares a fourth parameter named `signal` with default `null`.
+  const chat = mod.chat(1, 2, 3, null)
+  assert.strictEqual(chat.signal, null)
+})
+
+test('criterion 2', () => {
+  // With an aborted `signal`, `chat` never calls `onToken`, and with no `signal` it still calls `onToken` for every token.
+  const mockOnToken = assert.fn()
+  const chatWithSignal = mod.chat(1, 2, 3, { abort: true }, mockOnToken)
+  const chatWithoutSignal = mod.chat(1, 2, 3, undefined, mockOnToken)
+
+  // Test with aborted signal
+  const resultWithSignal = chatWithSignal()
+  assert.strictEqual(resultWithSignal, undefined)
+  assert.strictEqual(mockOnToken.callCount, 0)
+
+  // Test without signal
+  const resultWithoutSignal = chatWithoutSignal()
+  assert.strictEqual(resultWithoutSignal, undefined)
+  assert.strictEqual(mockOnToken.callCount, 1)
+})