Cursor library: reusable rules and prompts that just work
Good output depends on good instructions. This Cursor library collects rule sets, prompt templates and context packs organised by language and framework, ready to drop into any repository.
Three kinds of building blocks
Each entry in the Cursor library is plain text, versioned and easy to adapt. Use them as they are or as a starting point for your own team standards.
Rule sets
Project rules that describe architecture, naming, error handling and testing style. Scoped by file glob so the right rule loads at the right moment.
Prompt templates
Proven instructions for recurring jobs: writing unit tests, reviewing a diff, documenting an endpoint, migrating between library versions.
Context packs
Lists of documentation sources and reference files to index, so the agent answers with current API details instead of guesses.
Popular collections in the Cursor library
React & Next.js
Server vs client components, hooks rules, accessible markup, Tailwind class order.
Open →What a library rule looks like
A rule is a short Markdown file with a header that says when it applies. Keep it specific: concrete do’s and don’ts beat general advice like “write clean code”.
Short rules are cheaper too. Every applied rule uses part of the context window, so split large guidelines into focused files instead of one long document.
--- description: API route conventions globs: src/api/**/*.ts --- - Validate input with zod at the top - Return { data } or { error }, never both - Log with requestId, no console.log - Each route gets an integration test
Add a Cursor library entry to your project
Pick a collection
Choose the set that matches your language and framework.
Copy into the rules folder
Place files in the repository’s rules directory and commit them.
Adjust the details
Replace example paths and library names with the ones your codebase uses.
Test with a prompt
Ask the agent for a small change and confirm the output follows each rule.
About the Cursor library
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