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@@ -54,6 +54,10 @@ RUN --mount=type=cache,target=/root/.cache/uv \
         uv sync --no-editable; \
     fi
 
+# Patch OpenEnv web UI so number inputs use step=0.01 (allows lr_scale=0.02, momentum_coef=0.9)
+RUN WEBIF="$$(find /app/env/.venv -path '*openenv*env_server*web_interface.py' | head -1)" && \
+    /app/env/.venv/bin/python /app/env/scripts/patch_openenv_web_interface.py "$$WEBIF"
+
 # Final runtime stage
 FROM ${BASE_IMAGE}
 

scripts/patch_openenv_web_interface.py

@@ -0,0 +1,68 @@
+#!/usr/bin/env python3
+"""
+Apply step-attribute patch to OpenEnv web_interface.py so number inputs
+use step=0.01 (not default 1), allowing float values like lr_scale=0.02 and momentum_coef=0.9.
+Idempotent: safe to run multiple times.
+"""
+import sys
+from pathlib import Path
+
+
+def main() -> None:
+    if len(sys.argv) < 2:
+        # Discover path from current Python's site-packages
+        import openenv.core.env_server.web_interface as m
+
+        path = Path(m.__file__).resolve()
+    else:
+        path = Path(sys.argv[1]).resolve()
+
+    if not path.exists():
+        print(f"File not found: {path}", file=sys.stderr)
+        sys.exit(1)
+
+    text = path.read_text()
+
+    # Already patched?
+    if "_get_step_for_number_field" in text and '"step": _get_step_for_number_field(field_info)' in text:
+        print("Already patched:", path)
+        return
+
+    # 1) Insert helper before _extract_action_fields
+    old1 = 'def _extract_action_fields(action_cls: Type[Action]) -> List[Dict[str, Any]]:'
+    new1 = '''def _get_step_for_number_field(field_info: Dict[str, Any]) -> float | None:
+    """Step for number inputs; avoids HTML5 default of 1 which restricts float ranges."""
+    if field_info.get("type") == "integer":
+        return 1
+    if field_info.get("type") == "number":
+        return field_info.get("multipleOf") if field_info.get("multipleOf") is not None else 0.01
+    return None
+
+
+def _extract_action_fields(action_cls: Type[Action]) -> List[Dict[str, Any]]:'''
+    if new1 not in text and old1 in text:
+        text = text.replace(old1, new1, 1)
+
+    # 2) Add "step" to action_fields dict
+    old2 = '                "help_text": _generate_help_text(field_name, field_info),\n            }\n        )'
+    new2 = '                "help_text": _generate_help_text(field_name, field_info),\n                "step": _get_step_for_number_field(field_info),\n            }\n        )'
+    if new2 not in text and old2 in text:
+        text = text.replace(old2, new2, 1)
+
+    # 3) Add step_value and step attribute in _generate_single_field
+    old3a = "    max_value = field.get(\"max_value\")\n    default_value = field.get(\"default_value\")"
+    new3a = "    max_value = field.get(\"max_value\")\n    step_value = field.get(\"step\")\n    default_value = field.get(\"default_value\")"
+    if new3a not in text and old3a in text:
+        text = text.replace(old3a, new3a, 1)
+
+    old3b = "    if default_value is not None:\n        input_attrs.append(f'value=\"{default_value}\"')\n\n    attrs_str = \" \".join(input_attrs)"
+    new3b = "    if default_value is not None:\n        input_attrs.append(f'value=\"{default_value}\"')\n    if step_value is not None:\n        input_attrs.append(f'step=\"{step_value}\"')\n\n    attrs_str = \" \".join(input_attrs)"
+    if new3b not in text and old3b in text:
+        text = text.replace(old3b, new3b, 1)
+
+    path.write_text(text)
+    print("Patched:", path)
+
+
+if __name__ == "__main__":
+    main()