Thinking Beast Mode

Overview

Thinking Beast Mode is one of the most copied custom agent prompts in the Copilot community. It is not a tool integration, it is an elaborate set of instructions that tells the model to treat its own training data as outdated, to research every library it touches before using it, and to never end its turn until every item on its own todo list is checked off.

How it works

1. Before writing any code, it builds a todo list and works through the problem with the sequential_thinking tool, looking at it from several angles (technical, security, maintainability, user impact).
2. It fetches any URL the user provides, then recursively follows links it finds in that content, and does the same with Google/Bing searches when it needs to verify how a library or API actually works.
3. It reads large chunks of code at once (up to 2000 lines) before editing, and reapplies a patch if it does not land correctly the first time.
4. When something breaks, it looks for the root cause with logs and print statements rather than guessing at a fix.
5. Before declaring the task done, it red-teams its own solution and tests it repeatedly, since the prompt explicitly calls out under-testing as the most common failure mode for this kind of long, autonomous run.

Examples

"Beast mode, fix the flaky integration test in payments/checkout.spec.ts
and don't stop until it passes 10 times in a row."

Notes

The instructions are written in a deliberately flamboyant style ("quantum thinking," "constitutional analysis"). Treat that as a persistent framing device for a genuinely useful behavior: long, unattended runs with real verification steps, not a claim about actual quantum computing or consciousness.

Installation

You need VS Code with the GitHub Copilot extension.

1. Create the agents folder and download the file into your repo:

   mkdir -p .github/agents
   curl -o .github/agents/Thinking-Beast-Mode.agent.md \
     https://raw.githubusercontent.com/github/awesome-copilot/main/agents/Thinking-Beast-Mode.agent.md
   

2. Reload VS Code, or open a new Copilot Chat; custom agents under .github/agents/ are picked up automatically.
3. Pick this agent from the mode picker in Copilot Chat and give it an open-ended task to confirm it keeps working through its own todo list instead of stopping early.