Harden exact text image prompts

Author: Andrew I. Christianson

api/agent/system_skills/image_generation.py

@@ -16,7 +16,7 @@
     "lighting, palette/materials, exact text, constraints, and avoid items. Preserve an already detailed request "
     "instead of adding creative requirements. For a generic request, add only practical composition, framing, or "
     "polish details that materially help. Do not invent brands, slogans, characters, objects, palettes, or story "
-    "elements. Put required image text in quotes, require verbatim rendering, and prohibit extra text.\n"
+    "elements.\n"
     "For edits, write explicit invariants such as `change only X; preserve Y unchanged`, including identity, "
     "geometry, layout, typography, lighting, or surrounding objects as applicable. Repeat those invariants on every "
     "iteration. Make one targeted change per iteration and pass the prior generated file in `source_images` when "

api/agent/tools/create_image.py

@@ -444,7 +444,8 @@ def get_create_image_tool() -> Dict[str, Any]:
                         "type": "string",
                         "description": (
                             "Natural-language image prompt describing the desired output. Include enough concrete "
-                            "visual detail for a new asset, edit, style transfer, or art direction."
+                            "visual detail for a new asset, edit, style transfer, or art direction. Quote required "
+                            "in-image text, require verbatim rendering, and prohibit extra text."
                         ),
                     },
                     "file_path": {

api/evals/tests/test_image_generation.py

@@ -65,6 +65,10 @@ def test_eval_create_image_definition_matches_production_contract(self):
         self.assertEqual(synthetic["description"], production["description"])
         self.assertEqual(synthetic["parameters"], production["parameters"])
         self.assertEqual(synthetic["system_skill_key"], IMAGE_GENERATION_SYSTEM_SKILL_KEY)
+        self.assertIn(
+            "require verbatim rendering",
+            production["parameters"]["properties"]["prompt"]["description"],
+        )
 
     def test_cases_encode_source_text_multi_asset_and_negative_constraints(self):
         by_slug = {case.slug: case for case in IMAGE_GENERATION_CASES}