fix: handle JSON serialization error and update text length limit in directFetchTool

agent.py

@@ -15,7 +15,9 @@ from llama_index.llms.nebius import NebiusLLM
 import tools
 
 """
-TODO: 2. Update gradio app to include HF inference model instead of Ollama.
+TODO: 3. Fix submission error 'Agent finished. Submitting 13 answers for user 'agsagds'...
+Submitting 13 answers to: https://agents-course-unit4-scoring.hf.space/submit
+An unexpected error occurred during submission: Object of type AgentOutput is not JSON serializable'
 TODO: 4. Run HF Space and submit answers to the scoring server.
 TODO: 5. Get a certificate for the course.
 """
@@ -70,11 +72,16 @@ class BasicAgent:
         print(f"Agent received question (first 50 chars): {question[:50]}...")
         
         if self.verbose:
-            return await self.stream_answers(question)
+            answer = await self.stream_answers(question)
+            if answer is None:
+                return ''
+            return str(answer)
         
         answer = await self.workflow.run(user_msg=question)
         print(f"Agent returning answer: {answer}")
-        return answer
+        if answer is None:
+            return ''
+        return str(answer)
     
     def call_sync(self, question: str) -> str:
         """Synchronous wrapper for __call__ method (for compatibility with sync code)"""

tools.py

@@ -79,7 +79,7 @@ async def directFetchTool(url: str, offset: int = 0) -> str:
         offset: position from start of the web page content. Default  = 0
     Returns:
         The extracted meaningful text content of the webpage as a string.
-        If result length more then 2000 symbols than return only first 2000. Use `offset` option to show another part of the web page content.
+        If result length more then 10000 symbols than return only first 10000. Use `offset` option to show another part of the web page content.
         If an error occurs, returns an empty string.
     
     Example:
@@ -117,8 +117,8 @@ async def directFetchTool(url: str, offset: int = 0) -> str:
         lines = [line.strip() for line in text.split('\n') if line.strip()]
         text = '\n'.join(lines)
         
-        if len(text)>2000:
-            return f"Result is too big: {len(text)} chars. Return only slice ${offset}:${offset+2000}: \n\n" + text[offset:offset+2000]
+        if len(text)>10000:
+            return f"Result is too big: {len(text)} chars. Return only slice ${offset}:${offset+10000}: \n\n" + text[offset:offset+10000]
             
         return text
     except httpx.HTTPStatusError as e: