diff --git a/backend/tests/test_error_handling.py b/backend/tests/test_error_handling.py
index 3f922101..3a72a155 100644
--- a/backend/tests/test_error_handling.py
+++ b/backend/tests/test_error_handling.py
@@ -4,6 +4,7 @@ from __future__ import annotations
 
 import pytest
 from fastapi import FastAPI, HTTPException
+from fastapi.exceptions import RequestValidationError, ResponseValidationError
 from fastapi.testclient import TestClient
 from pydantic import BaseModel, Field
 from starlette.requests import Request
@@ -16,6 +17,8 @@ from app.core.error_handling import (
     _http_exception_exception_handler,
     _request_validation_exception_handler,
     _response_validation_exception_handler,
+    _request_validation_handler,
+    _response_validation_handler,
     install_error_handling,
 )
 
@@ -203,3 +206,47 @@ async def test_http_exception_wrapper_rejects_wrong_exception() -> None:
     req = Request({"type": "http", "headers": [], "state": {}})
     with pytest.raises(TypeError, match="Expected StarletteHTTPException"):
         await _http_exception_exception_handler(req, Exception("x"))
+
+
+@pytest.mark.asyncio
+async def test_request_validation_handler_includes_request_id() -> None:
+    req = Request({"type": "http", "headers": [], "state": {"request_id": "req-1"}})
+    exc = RequestValidationError(
+        [
+            {
+                "loc": ("query", "limit"),
+                "msg": "value is not a valid integer",
+                "type": "type_error.integer",
+            }
+        ]
+    )
+
+    resp = await _request_validation_handler(req, exc)
+    assert resp.status_code == 422
+    assert resp.body
+
+
+@pytest.mark.asyncio
+async def test_response_validation_handler_includes_request_id() -> None:
+    req = Request(
+        {
+            "type": "http",
+            "method": "GET",
+            "path": "/x",
+            "headers": [],
+            "state": {"request_id": "req-2"},
+        }
+    )
+    exc = ResponseValidationError(
+        [
+            {
+                "loc": ("response", "name"),
+                "msg": "field required",
+                "type": "value_error.missing",
+            }
+        ]
+    )
+
+    resp = await _response_validation_handler(req, exc)
+    assert resp.status_code == 500
+    assert resp.body