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.
git clone --depth 1 https://github.com/ddebixx/frontend-templateWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/rules/ddebixx/frontend-template/10-project-constraints)<a href="https://agentmods.dev/rules/ddebixx/frontend-template/10-project-constraints"><img src="https://agentmods.dev/badge/rules/ddebixx/frontend-template/10-project-constraints/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/rules/ddebixx/frontend-template/10-project-constraints"><img src="https://agentmods.dev/badge/rules/ddebixx/frontend-template/10-project-constraints.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00218 | $0.00218 |
| Opus 5.5 | $0.00087 | $0.00087 |
| Sonnet 5.5 | $0.00044 | $0.00044 |
| Haiku 4.5 | $0.00022 | $0.00022 |
Grade A, and why
10-project-constraints 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 3d ago.
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.
What it actually says
Project constraints
This repository is a Next.js App Router or Vite + React frontend template. Do not replace that choice or add a second app framework inside one variant.
Do not swap the default stack unless the task explicitly changes it: TypeScript strict, Tailwind with cn (clsx + twMerge), Biome, Fallow, Vitest, Playwright, Tanstack Query, Zod, and React Context / useState before Zustand.
Do not add Storybook or a second component library. UI primitives are shadcn/ui.
Internationalization and accessibility are in scope for UI. Follow their file-scoped rules.
Add files under the existing src/ and e2e/ layout. Do not invent parallel top-level folders. Folder roles are in the project-structure rule and docs/frontend/INDEX.md.
Do not finish a code change while lint, types, or tests are failing.
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.
- 3d ago First seen · 19 lines · 218 tokens per session scan A 3f37fe716e6d
10-project-constraints is a cursor rule published in the GitHub repository ddebixx/frontend-template (5 stars, last pushed 3d ago), licensed MIT. It adds 218 tokens to every session, about $0.0009 per session on Opus 5.5. 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 2026-10-13.
Other cursor rules, from other repositories
creative-phase-uiux
UI/UX Design Guidelines and Process for the Creative Phase.
web-pages-full-e2e-completion-gate
Web-facing changes must pass full web E2E workflow before completion.
development-workflow-react
Essential linting and quality checks for React + Vite development.
20-testing-generated-and-structure
Testing expectations, generated-file boundaries, and CLI structure contract.
shadcn-tailwind-guide
A guide to building new components with shadcn/ui and Tailwind CSS, a utility-based system for styling interfaces.
testing-and-quality
The testcomprehensive.py provides systematic testing of all 31 MCP tools.