From ead3ac8f767b77bc84db8d2456e412eab04e2fe9 Mon Sep 17 00:00:00 2001
From: Sylvester Kaczmarek
 <16242628+sylvesterkaczmarek@users.noreply.github.com>
Date: Mon, 17 Aug 2026 21:06:33 +0100
Subject: [PATCH 1/2] fix(retry): reject negative retry counts

---
 src/agents/retry.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/agents/retry.py b/src/agents/retry.py
index 5ad40f68ac..91d33a489f 100644
--- a/src/agents/retry.py
+++ b/src/agents/retry.py
@@ -210,7 +210,7 @@ def retry_policy_retries_all_transient_errors(policy: RetryPolicy | None) -> boo
 class ModelRetrySettings:
     """Opt-in runner-managed retry settings for model calls."""
 
-    max_retries: int | None = None
+    max_retries: int | None = Field(default=None, ge=0)
     """Retries allowed after the initial model request."""
 
     backoff: ModelRetryBackoffInput | None = None

From b9f6a04747e703e83fd72b4230c65f115cb48757 Mon Sep 17 00:00:00 2001
From: Sylvester Kaczmarek
 <16242628+sylvesterkaczmarek@users.noreply.github.com>
Date: Mon, 17 Aug 2026 21:06:40 +0100
Subject: [PATCH 2/2] test(retry): cover retry count validation

---
 tests/test_retry_count_validation.py | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
 create mode 100644 tests/test_retry_count_validation.py

diff --git a/tests/test_retry_count_validation.py b/tests/test_retry_count_validation.py
new file mode 100644
index 0000000000..928bf42a04
--- /dev/null
+++ b/tests/test_retry_count_validation.py
@@ -0,0 +1,16 @@
+from __future__ import annotations
+
+import pytest
+from pydantic import ValidationError
+
+from agents.retry import ModelRetrySettings
+
+
+def test_model_retry_settings_rejects_negative_max_retries() -> None:
+    with pytest.raises(ValidationError):
+        ModelRetrySettings(max_retries=-1)
+
+
+def test_model_retry_settings_allows_zero_max_retries() -> None:
+    settings = ModelRetrySettings(max_retries=0)
+    assert settings.max_retries == 0