diff --git a/backend/src/__tests__/offers.test.js b/backend/src/__tests__/offers.test.js
index 9bb78bb..96dece7 100644
--- a/backend/src/__tests__/offers.test.js
+++ b/backend/src/__tests__/offers.test.js
@@ -99,4 +99,32 @@ test('POST /offers/accept/:offerId should return 404 for non-existent offer', as
     payload: {}
   });
   assert.strictEqual(response.statusCode, 404);
+});
+
+// Additional test for validation of message length
+test('POST /offers/:requestId should return 400 for message exceeding max length', async () => {
+  const longMessage = 'a'.repeat(2001); // 2001 characters
+  const response = await app.inject({
+    method: 'POST',
+    url: '/offers/1',
+    payload: {
+      amountChf: 50,
+      message: longMessage
+    }
+  });
+  assert.strictEqual(response.statusCode, 400);
+});
+
+// Additional test for validation of negotiation message length
+test('POST /offers/negotiation/:offerId should return 400 for message exceeding max length', async () => {
+  const longMessage = 'a'.repeat(2001); // 2001 characters
+  const response = await app.inject({
+    method: 'POST',
+    url: '/offers/negotiation/1',
+    payload: {
+      amountChf: 60,
+      message: longMessage
+    }
+  });
+  assert.strictEqual(response.statusCode, 400);
 });
\ No newline at end of file
diff --git a/docs/runtime/pick_next_task_state.env b/docs/runtime/pick_next_task_state.env
index b5238c7..65bd48c 100644
--- a/docs/runtime/pick_next_task_state.env
+++ b/docs/runtime/pick_next_task_state.env
@@ -1,2 +1,2 @@
-LAST_ROUTE=auth.js
-UPDATED_AT=2026-03-06T20:10:38Z
+LAST_ROUTE=offers.js
+UPDATED_AT=2026-03-06T20:17:13Z