designlang

designlang is a cursor rule for Cursor from Manavarya09/design-extract. It costs 235 tokens per session, scanned A, original, MIT.

A set of design rules and reusable values extracted from cal.com, including colours, typography, corner radius, and page regions. It tells other work which existing values to reuse instead of inventing new ones.

In plain words
What is it for?
Use it when building interfaces based on cal.com's visual language, especially when choosing colours, fonts, control shapes, or content regions.
Why use it?
It keeps a page or component visually consistent with the referenced website and makes missing design values explicit.

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/manavarya09/design-extract/designlang
Clone the repo
git clone --depth 1 https://github.com/Manavarya09/design-extract

Made for: Cursor.

Wrote 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.

agentmods badge for designlang

README.md
[![agentmods](https://agentmods.dev/badge/rules/manavarya09/design-extract/designlang.svg)](https://agentmods.dev/rules/manavarya09/design-extract/designlang)
Your own site
<a href="https://agentmods.dev/rules/manavarya09/design-extract/designlang"><img src="https://agentmods.dev/badge/rules/manavarya09/design-extract/designlang.svg" alt="Measured on agentmods" height="20"></a>
Per session 235 This file is loaded in full into every session.
When invoked 235 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 $0.00235 $0.00235
Opus 5 $0.00118 $0.00118
Sonnet 5 $0.00047 $0.00047
Haiku 4.5 $0.00023 $0.00023

Measured 4d ago against content hash fbc5f30a2f3a, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

designlang 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 4d 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.

website/public/gallery/cal-com/.cursor/rules/designlang.mdc · 28 lines

What it actually says

Design system reference

Source: https://cal.com Extracted by designlang v7.0.0 on 2026-06-25T08:26:30.283Z

Semantic tokens (use these)

  • color.action.primary: #0000ee
  • color.surface.default: #f4f4f4
  • color.text.body: #000000
  • radius.control: 2px
  • typography.body.fontFamily: Inter

Regions

  • content
  • testimonials
  • content

How to use

  • Prefer semantic.* tokens over primitive.*.
  • Never invent new tokens or hex values; reuse the ones above.
  • When a value is missing, pick the closest existing semantic token and flag the gap.
  • Reference tokens by their dotted path (e.g. semantic.color.action.primary).
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. 4d ago First seen · 28 lines · 235 tokens per session scan A fbc5f30a2f3a

Subscribe to this mod's changes

designlang is a cursor rule published in the GitHub repository Manavarya09/design-extract (4,000 stars, last pushed 3d ago), licensed MIT. It adds 235 tokens to every session, about $0.0012 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.