pen-editor-dev-mode

pen-editor-dev-mode is a skill for Claude Code, Codex from dan-rozhkov/pen-editor-plugin. It costs 68 tokens per session (916 once invoked), scanned A, original, MIT.

A skill for turning an existing Pen Editor design into frontend code.

In plain words
What is it for?
Use it to implement a Pen Editor component or screen in a codebase without changing the original design.
Why use it?
It explains how to inspect the design's structure, calculated layout, tokens, and screenshot so the resulting markup and CSS match it.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to implement a Pen Editor component or screen in a codebase without changing the original design.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/dan-rozhkov/pen-editor-plugin/pen-editor-dev-mode
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.

Any agent
npx skills add dan-rozhkov/pen-editor-plugin --skill pen-editor-dev-mode
Clone the repo
git clone --depth 1 https://github.com/dan-rozhkov/pen-editor-plugin

Made for: Claude Code, Codex.

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 pen-editor-dev-mode

README.md
[![agentmods](https://agentmods.dev/badge/skills/dan-rozhkov/pen-editor-plugin/pen-editor-dev-mode/github.svg)](https://agentmods.dev/skills/dan-rozhkov/pen-editor-plugin/pen-editor-dev-mode)
Your own site
<a href="https://agentmods.dev/skills/dan-rozhkov/pen-editor-plugin/pen-editor-dev-mode"><img src="https://agentmods.dev/badge/skills/dan-rozhkov/pen-editor-plugin/pen-editor-dev-mode/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.

agentmods 80×15 button for pen-editor-dev-mode

Your own site · 80×15
<a href="https://agentmods.dev/skills/dan-rozhkov/pen-editor-plugin/pen-editor-dev-mode"><img src="https://agentmods.dev/badge/skills/dan-rozhkov/pen-editor-plugin/pen-editor-dev-mode.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 68 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 916 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00068 $0.00916
Opus 5.5 $0.00027 $0.00366
Sonnet 5.5 $0.00014 $0.00183
Haiku 4.5 $0.00007 $0.00092

Measured 1mo ago against content hash 80457f54e4a2, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

pen-editor-dev-mode 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 1mo 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.

skills/pen-editor-dev-mode/SKILL.md · 33 lines

How it starts

The opening of the file, as written. The whole thing — 33 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Pen Editor dev mode

You are translating a live Pen Editor design into code. This is a read-only task against the design: gather everything you need, then write code in the target codebase. Do not call batch_design or set_variables — reading a design in order to implement it is not a license to edit it. If the user actually wants the design itself changed, that's the pen-editor-design skill, not this one.

All Pen Editor tools below are bridged and require a connected browser tab (30s timeout). If a call errors with "No Pen Editor tab is connected", see pen-editor-setup.

Workflow

  1. get_editor_state — active file, selection, top-level nodes, available components. Establishes what you're implementing and its scope.
  2. batch_get — pull the actual subtree you're implementing (by nodeIds or a search patterns match), with enough readDepth/searchDepth to see every descendant that matters. This is the node model: types, layout/fills/strokes/effects/cornerRadius, text content, etc.
  3. snapshot_layout — the fidelity-critical step. This returns computed rectangles (positions/sizes) after Pen Editor's layout engine has run — not the raw authored properties. Use these numbers, not eyeballed guesses, for spacing, sizing, and any absolutely-positioned children. problemsOnly: true surfaces clipping/overflow you should account for in the implementation.
  4. get_variables — read the design's tokens and map them onto the codebase's own design tokens (CSS variables, Tailwind theme values, etc.) rather than hardcoding hex values pulled off a node. If a fill/stroke references $--some-token, your code should reference the codebase's equivalent token, not a literal color.
  5. get_screenshot — visual reference while translating, and again afterward to compare your built component against the design.

Translating the node model to code

  • An auto-layout frame (layout: "vertical" or "horizontal") → a flex container in that direction; its gap/padding → gap/padding in CSS.
  • width/height: "fill_container" → flex-grow / stretch sizing; "fit_content" → hug/auto sizing (e.g. width: fit-content or an unset flex-basis).
  • constraints: {horizontal, vertical} on a node without auto-layout → non-flex positioning (absolute/pinned edges) — min/max/center/stretch/scale map to how that node should reposition/resize as its container resizes.
  • cornerRadius — either a single number (uniform) or a 4-entry array [topLeft, topRight, bottomRight, bottomLeft] — maps directly to border-radius (shorthand or per-corner).
  • The fills/strokes/effects arrays are paint/effect stacks, bottom-to-top (last entry renders on top): solid → background-color/border-color, gradient → CSS gradient, image → background-image/<img>, shadow (outer/inner) → box-shadow, blur → filter: blur(), background-blur → backdrop-filter: blur(). Reproduce stack order and blend modes if the design uses more than one layer.

Read the full file on GitHub · 33 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. 1mo ago First seen · 33 lines · 68 tokens per session scan A 80457f54e4a2

Subscribe to this mod's changes

pen-editor-dev-mode is a skill published in the GitHub repository dan-rozhkov/pen-editor-plugin (0 stars, last pushed 2d ago), licensed MIT. It adds 68 tokens to every session and 916 once invoked, about $0.0003 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 2026-08-31.

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