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.
npx skills add sergekostenchuk/ui-ux-agent-skill-system --skill pencil-design-bridgegit clone --depth 1 https://github.com/sergekostenchuk/ui-ux-agent-skill-systemWrote 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/skills/sergekostenchuk/ui-ux-agent-skill-system/pencil-design-bridge)<a href="https://agentmods.dev/skills/sergekostenchuk/ui-ux-agent-skill-system/pencil-design-bridge"><img src="https://agentmods.dev/badge/skills/sergekostenchuk/ui-ux-agent-skill-system/pencil-design-bridge/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/skills/sergekostenchuk/ui-ux-agent-skill-system/pencil-design-bridge"><img src="https://agentmods.dev/badge/skills/sergekostenchuk/ui-ux-agent-skill-system/pencil-design-bridge.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 | $0.00077 | $0.00669 |
| Opus 5.5 | $0.00031 | $0.00268 |
| Sonnet 5.5 | $0.00015 | $0.00134 |
| Haiku 4.5 | $0.00008 | $0.00067 |
Grade A, and why
pencil-design-bridge 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.
How it starts
The opening of the file, as written. The whole thing — 63 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Pencil Design Bridge
This skill is the Pencil layer in the UI/UX Agent Skill System. Pencil is a design-tool bridge and editable design workspace, not the central architect and not a plain-file parser.
Operating Modes
brief: turn an approved direction brief into a Pencil-ready design brief.canvas-handoff: prepare instructions for Pencil MCP/tools or a Pencil-capable agent.review-output: review Pencil output against UX, SEO/LLM, accessibility, brand, and implementation constraints.figma-code-handoff: prepare Pencil results for Figma or code implementation.config-check: check whether Pencil tools are available in the current runtime without reading.penfiles directly.
Required Workflow
- Read references/pencil-bridge-contract.md.
- Confirm the source brief was approved by
senior-ui-ux-orchestratoror came from an explicit user decision. - Confirm inputs:
- product/UX journey;
- SEO/LLM constraints for public pages;
ui-ux-pro-maxdesign intelligence;- optional Stitch output or Figma constraints;
- required assets and forbidden claims.
- Use assets/pencil-handoff.template.md for handoff packets.
- Access
.pendocuments only through Pencil MCP/tools. Do not use shell reads, grep, cat, or ad hoc JSON parsing on.penfiles. - Treat Pencil output as a candidate design artifact. It still needs review before Figma, code, or production use.
Safety Rules
- Do not store API keys, tokens, cookies, private URLs, private screenshots, or
.envvalues in Pencil handoffs. - Do not claim a Pencil tool ran unless a callable Pencil tool was used and an artifact path or tool response exists.
- If Pencil tooling is unavailable, produce a manual handoff and mark execution as
SkippedorPlanned. - If Pencil output conflicts with accessibility, visible facts, SEO/LLM structure, or implementation feasibility, route to council.
Handoff Shape
What ships with it
4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 1mo ago First seen · 63 lines · 77 tokens per session scan A 88ec3abc8606
pencil-design-bridge is a skill published in the GitHub repository sergekostenchuk/ui-ux-agent-skill-system (32 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 77 tokens to every session and 669 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 2026-08-30.
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