# @yadarilab on Instagram

- **Type:** Video
- **Original URL:** https://www.instagram.com/p/DdW72ivqz_z
- **Gondola URL:** https://gondola.cc/posts/70575907-yadarilab-instagram
- **Thumbnail:** https://img.gondola.cc/tr:w-,h-,fo-auto/postThumbnails/f16da419e2.jpg
- **Posted:** 2026-09-16T18:32:30.000+00:00
- **Account Owner:** Yassir El Yadari (@yadarilab) — https://gondola.cc/yadarilab

## Caption

What if you could study the instructions behind claude?

A GitHub repository is circulating as the alleged Claude Fable 5.1 system prompt.

It’s said to be more than 275,000 characters long, around 8,000 lines.

The repository claims to include the model’s tools, instructions, and behavior rules: how it plans, what it can use, and how it approaches a task.

The real value isn’t copying the prompt.

It’s studying how it’s structured.

How are tools described?

How are limits defined?

How does the model know what to use, and when?

Most people improve their prompts through trial and error.

This gives you a chance to examine a much larger system prompt and learn from its structure.

Comment “FABLE” and I’ll send you the GitHub link.

#claudefable5 #systemprompt #aiprompting #githubrepo #claudeai

## Stats

- **Views:** 22,965
- **Likes:** 534
- **Shares:** 0
- **Comments:** 568

## Tags

aiprompting, claudeai, claudefable5, systemprompt, githubrepo

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