From bf421929eae0d3e2fd0fd8648329970f12918f5c Mon Sep 17 00:00:00 2001
From: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Date: Mon, 12 Oct 2026 16:05:50 +0000
Subject: [PATCH] fix(execution): strip images when xAI rejects one it cannot
 decode

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
---
 strix/core/execution.py                 |  4 +++-
 tests/test_execution_transient_retry.py | 15 +++++++++++++++
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/strix/core/execution.py b/strix/core/execution.py
index 87a2bf02..412cf998 100644
--- a/strix/core/execution.py
+++ b/strix/core/execution.py
@@ -67,7 +67,9 @@ _IMAGE_REJECTION = re.compile(
     r"|does not support image input"  # LiteLLM's Fireworks check
     r"|doesn't support the image field"  # Bedrock Converse
     r"|unknown variant `image_url`"  # DeepSeek, e.g. via Vercel AI Gateway
-    r"|'[^']*image[^']*' functionality not supported",  # Vercel AI Gateway (AI SDK), unverified
+    r"|'[^']*image[^']*' functionality not supported"  # Vercel AI Gateway (AI SDK), unverified
+    r"|does not contain a valid JPG, PNG, WebP, or ICO image"  # xAI: URL fetched, not an image
+    r"|unsupported content-type encountered when downloading image",  # xAI
     re.IGNORECASE,
 )
 _MAX_COMPACTIONS_PER_CYCLE = 2
diff --git a/tests/test_execution_transient_retry.py b/tests/test_execution_transient_retry.py
index f0276932..93cd4d16 100644
--- a/tests/test_execution_transient_retry.py
+++ b/tests/test_execution_transient_retry.py
@@ -188,6 +188,21 @@ async def test_run_cycle_does_not_retry_permanent_error(
         (400, "This model doesn't support the image field for user messages.", True),
         (422, "messages[3]: unknown variant `image_url`, expected `text`", True),
         (400, "'Image URLs in user messages' functionality not supported.", True),
+        (
+            400,
+            "litellm.BadRequestError: OpenrouterException - "
+            '{"error":{"message":"Provider returned error","code":400,"metadata":{"raw":'
+            '"{\\"code\\":\\"invalid_image\\",\\"error\\":\\"code: \'Client specified an '
+            "invalid argument', message: Downloaded response does not contain a valid JPG, "
+            'PNG, WebP, or ICO image.\\"}","provider_name":"xAI"}}}',
+            True,
+        ),
+        (
+            400,
+            "Unsupported content-type encountered when downloading image. The only "
+            "supported content types are [image/jpeg, image/png, image/webp].",
+            True,
+        ),
         (
             400,
             "OpenRouterException: Message: This model's maximum context length is 1048576 "