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models.py

@@ -40,7 +40,10 @@ class SkillInvocationAction(Action):
         default=None, description='Skill ID (required for load/unload)'
     )
     answer: Optional[str] = Field(
-        default=None, description='Solution text (required for submit)', max_length=100000
+        default=None, 
+        description='Solution text (required for submit)', 
+        max_length=100000,
+        json_schema_extra={"type": "string"}
     )
 
 

test_schema.py

@@ -0,0 +1,8 @@
+from pydantic import BaseModel, Field
+from typing import Optional
+import json
+
+class A(BaseModel):
+    answer: Optional[str] = Field(None, json_schema_extra={"type": "string", "maxLength": 100000})
+
+print(json.dumps(A.model_json_schema(), indent=2))