Add specific guidance to prevent common coding errors

- Add instruction to convert numpy types to int when using as indices
- Add guidance for simple plt.legend() usage without complex arguments
- Add reminder for proper pandas .iloc/.loc indexing
- These should prevent the recent numpy.float64 and matplotlib legend errors

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

src.py

@@ -295,6 +295,9 @@ Requirements:
 - For text answers: store text directly in 'answer'
 - Use proper syntax: f"filename_{{uuid.uuid4().hex[:8]}}.png"
 - Add plt.tight_layout() before saving plots
+- Convert numpy types to int when using as indices: int(value)
+- Use simple plt.legend() without complex arguments
+- Always use .iloc or .loc properly for pandas indexing
 """
 
         query = f"""{system_prompt}