A coding skill for Pretext, a TypeScript library that measures the size of text without asking a web page to redraw itself. Text measurement helps software calculate wrapping, spacing, and layout.

Using Pretext to calculate exact text metrics and support text layout or typography in TypeScript projects.

It helps code work out text dimensions without relying on browser layout updates, which can complicate or slow text rendering.

pretext — Plugin by yaniv-golan

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.

Claude Code

/plugin marketplace add yaniv-golan/pretext-skill

agentmods

npx agentmods add plugins/yaniv-golan/pretext-skill/pretext

Clone the repo

git clone --depth 1 https://github.com/yaniv-golan/pretext-skill

Made for: Claude Code.

Per session not measured What this adds to a session before it is invoked.

When invoked not measured Not applicable: nothing here is loaded into a session.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

pretext 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 2d 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.

pretext/.claude-plugin/plugin.json · 14 lines

What it actually says

{
  "name": "pretext",
  "version": "0.2.2",
  "description": "AI skill for @chenglou/pretext — a small, tree-shakable TypeScript text measurement library that computes exact text metrics without DOM reflows",
  "author": {
    "name": "Yaniv Golan",
    "email": "[email protected]"
  },
  "repository": "https://github.com/yaniv-golan/pretext-skill",
  "license": "MIT",
  "keywords": ["pretext", "text-measurement", "text-layout", "canvas", "typography", "reflow-free"],
  "skills": "./skills"
}

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.

2d ago First seen · 14 lines scan A 35f89fed064a

Subscribe to this mod's changes

pretext is a plugin published in the GitHub repository yaniv-golan/pretext-skill (15 stars, last pushed 1mo ago), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. 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.

Analytics and metrics Frontend Languages agent-skills ai-agent claude claude-code-plugin cursor developer-tools

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pretext

Getting it into your agent

Grade A, and why

Nothing flagged

What it actually says

What this file has done since we first saw it

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