cursorrules

A set of coding rules for applications built with webjs, a web framework focused on web components and pages that do not require a build step. It tells the agent to read the project guide and follow its data-storage and scaffold conventions.

In plain words
What is it for?
Use it while developing a webjs app to choose the approved database setup, replace starter content, follow the available templates, and consult the project’s instructions.
Why use it?
It prevents common project mistakes, such as using JSON files as a database or shipping the example app instead of the requested product.

Cursor rule for Cursor

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add rules/webjsdev/webjs/cursorrules
Clone the repo
git clone --depth 1 https://github.com/webjsdev/webjs

Made for: Cursor.

Per session 2,016 This file is loaded in full into every session.
When invoked 2,016 The same file — it is already loaded in full.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.02016 $0.02016
Opus 5 $0.01008 $0.01008
Sonnet 5 $0.00403 $0.00403
Haiku 4.5 $0.00202 $0.00202

Measured yesterday against content hash 8ee86975065d, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

cursorrules scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

examples/blog/.cursorrules · 108 lines

How it starts

The opening of the file, as written. The whole thing — 108 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Cursor Rules: webjs app

You are working on a webjs app, an AI-first, no-build, web-components-first framework. Read AGENTS.md for the full API reference and CONVENTIONS.md for project-specific conventions before writing any code. When AGENTS.md doesn't cover what you need, the full hosted docs are at https://webjs.dev/docs.

Persistence + scaffold rules (non-negotiable)

  • Use Drizzle + SQLite for data, never JSON files. It's already wired up (db/schema.server.ts, db/connection.server.ts, npm run db:generate + npm run db:migrate). For ANY data the app stores (todos, posts, messages, products, comments…), define a Drizzle table. NEVER create data/*.json, db.json, or any JSON file as a fake database. NEVER use module-scope arrays / Maps as a substitute. NEVER use localStorage for app data. These are project conventions in CONVENTIONS.md (a JSON file used as a database resets on reload and cannot scale).
  • The scaffold is reference, not the final product. Replace app/page.ts, the example User model, the example users module, etc. with the app the user actually asked for. Don't ship "Hello from " as the deliverable.
  • Only three templates exist: webjs create <name> (default full-stack), --template api, --template saas. The CLI rejects any other --template value. Pick:
    • Any product UI (todo, blog, dashboard, marketplace, social…) → default
    • HTTP/JSON API only, no UI → --template api
    • Auth / login / signup / SaaS → --template saas

Before starting ANY work

FIRST, before writing any code:

  1. Run git branch --show-current to check the branch.
    • If on main/master: STOP. Ask the user which branch to use, or create one with git checkout -b feature/<name>.
    • If on a feature branch: verify it matches the current task. Ask if unsure.
  2. Sync with parent: git fetch origin && git log HEAD..origin/main --oneline
    • If upstream has new commits: git rebase origin/main before starting.
    • Resolve any conflicts before proceeding with the task.

Read the full file on GitHub · 108 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. yesterday First seen · 108 lines · 2,016 tokens per session scan A 8ee86975065d

Subscribe to this mod's changes

cursorrules is a cursor rule published in the GitHub repository webjsdev/webjs (109 stars, last pushed 10d ago), licensed MIT. It adds 2,016 tokens to every session, about $0.0101 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.