Used Claude Fable to strengthen my prompt library 526 prompts, 77 categories, free (no signup)

I'd been collecting prompts for this library over the last few months (started marketing-focused, grew into engineering categories too: Architecture, Debugging, Security, Cloud, DevOps, API Design, Distributed Systems, etc.). Over the last few days I ran the whole thing through Claude Fable Anthropic's newest model to rewrite the weak ones and make them stronger and more specific. Didn't add any new categories, just went through what was already there and tightened it up. Cut/edited anything that didn't hold up after the rewrite.

couple examples from the prompt engineering section:

score & optimize

score this prompt from 1-10 on four dimensions: clarity, specificity, context completeness, output-readiness. show the four scores with a one-line justification each

vague → master prompt

turn this vague instruction into a complete, reusable prompt. add: the concrete task, the context a model would need to make good trade-offs, an output format, and three short examples of what good output looks like. if the instruction is too vague to infer intent, ask me one clarifying question first instead of guessing. vague instruction: [paste it]

condense without losing quality

condense this long, messy prompt into the shortest version that produces identical output quality. cut redundancy and filler, merge overlapping instructions, and keep every constraint that actually changes the output. show the condensed prompt, then list what you removed and why it was safe to remove. prompt: [paste it]

526 prompts across 77 categories. no signup, no subscription, nothing gated just a page you can browse: promptflow.digital/prompts. there's also a Chrome extension if you want one-click injection into ChatGPT/Claude/Gemini instead of copy-paste.

if anyone here has a prompt they're proud of, drop it below. happy to add good ones to the library so other people can use it for free too.