fix shape

plugins/image_gen/krea/__init__.py

@@ -86,6 +86,11 @@ _ASPECT_MAP = {
 # Only resolution Krea currently supports.
 DEFAULT_RESOLUTION = "1K"
 
+# Krea's image_style_references entries are objects ({"url", "strength"}), not
+# bare URL strings. When the caller supplies a URL without an explicit strength
+# we apply Krea's recommended starting value. Range per Krea docs is -2..2.
+_DEFAULT_STYLE_REFERENCE_STRENGTH = 0.6
+
 # Valid creativity levels per Krea docs. Default is "medium".
 _VALID_CREATIVITY = {"raw", "low", "medium", "high"}
 
@@ -402,8 +407,19 @@ class KreaImageGenProvider(ImageGenProvider):
 
         if style_refs:
             # Reference-guided generation (image-to-image style transfer).
-            # Krea caps at 10 refs per request (already clamped above).
-            payload["image_style_references"] = style_refs
+            # Krea requires each entry to be an object ({"url", "strength"}),
+            # NOT a bare URL string — a string yields a 422 "Expected object,
+            # received string". Convert URL strings to the object form and pass
+            # already-object refs through verbatim (clamped to 10 above).
+            normalized_refs: List[Any] = []
+            for ref in style_refs:
+                if isinstance(ref, str):
+                    normalized_refs.append(
+                        {"url": ref, "strength": _DEFAULT_STYLE_REFERENCE_STRENGTH}
+                    )
+                else:
+                    normalized_refs.append(ref)
+            payload["image_style_references"] = normalized_refs
 
         moodboards = kwargs.get("moodboards")
         if isinstance(moodboards, list) and moodboards:

tests/plugins/image_gen/test_krea_provider.py

@@ -309,6 +309,35 @@ class TestGenerate:
         assert len(payload["image_style_references"]) == 10  # capped at 10
         assert payload["creativity"] == "high"
 
+    def test_string_style_references_converted_to_objects(self):
+        """Krea requires {url, strength} objects; bare URL strings must be
+        converted (a string yields a 422 'Expected object, received string')."""
+        from plugins.image_gen.krea import KreaImageGenProvider
+
+        submit = _submit_response()
+        poll = _poll_response(_completed_job())
+
+        with patch("plugins.image_gen.krea.requests.post", return_value=submit) as mock_post, \
+             patch("plugins.image_gen.krea.requests.get", return_value=poll), \
+             patch(
+                 "plugins.image_gen.krea.save_url_image",
+                 return_value=Path("/tmp/x.png"),
+             ), \
+             patch("plugins.image_gen.krea.time.sleep"):
+            KreaImageGenProvider().generate(
+                prompt="test",
+                image_style_references=[
+                    "https://x.com/a.png",
+                    {"url": "https://x.com/b.png", "strength": 1.2},
+                ],
+            )
+
+        payload = mock_post.call_args.kwargs["json"]
+        assert payload["image_style_references"] == [
+            {"url": "https://x.com/a.png", "strength": 0.6},
+            {"url": "https://x.com/b.png", "strength": 1.2},
+        ]
+
     def test_unknown_kwargs_ignored(self):
         """Forward-compat: unknown kwargs must not break generate()."""
         from plugins.image_gen.krea import KreaImageGenProvider