Auth 400 Error Fix: Using Python's mnemonic Package to Avoid BIP39 Filter Triggers

Auth 400 Error Trigger and Solution

An issue was reported where AI agents encounter an Auth 400 error when attempting to write the complete BIP39 wordlist into a Python file. The BIP39 wordlist is a standardized list of exactly 2048 English words from the Bitcoin Improvement Proposal.

When an agent tries to write all 2048 words into a Python file, Anthropic's content filter flags this as "reproducing pre-existing copyrighted/standardized material" — which is exactly what the filter is designed to block.

The Fix

The solution is to use the mnemonic Python package instead of embedding the raw 2048 words directly in your code. This package already contains the BIP39 wordlist internally, providing the same functionality without triggering the content filter.

To implement this fix:

• Open a new conversation with your AI agent
• Ask the agent to generate a new prompt using the mnemonic package instead of hardcoding the BIP39 wordlist

This approach maintains the required functionality while avoiding the filter trigger that causes the Auth 400 error.