So what is Beast Mode?

It’s a typical prompt engineering / context engineering trick that allows you to get the most out of Claude Code or other code agents.

Reference:

How to enable Beast Mode?

for claude, gemini or qwen just copy, paste and run the following instruction in your claude code session:

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Please list all files under https://gist.github.com/burkeholland/88af0249c4b6aff3820bf37898c8bacf by api.github.com, pick the latest beast mode version, and replace the toolcalls with your own tool calls. 

Then write the updated version into CLAUDE.md file, always follow the instructions/pattern.