A design guide for coding assistants that helps them create less repetitive-looking user interfaces. It chooses a page structure, applies one of 21 colour themes, checks the result against design rules, and reviews it before output.

Designing web pages and interface screens with a chosen structure, colour theme, and checks against unwanted default patterns.

It addresses common generated-interface patterns that can make websites look generic or unfinished.

hallmark — Skill for Claude Code by psd401/psd-claude-plugins

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 psd401/psd-claude-plugins --skill hallmark

Clone the repo

git clone --depth 1 https://github.com/psd401/psd-claude-plugins

Made for: Claude Code.

Or install psd-coding-system, the plugin that ships this one along with the rest of its 9 skills.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/psd401/psd-claude-plugins/hallmark/github.svg)](https://agentmods.dev/skills/psd401/psd-claude-plugins/hallmark)

Your own site

<a href="https://agentmods.dev/skills/psd401/psd-claude-plugins/hallmark"><img src="https://agentmods.dev/badge/skills/psd401/psd-claude-plugins/hallmark/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/psd401/psd-claude-plugins/hallmark"><img src="https://agentmods.dev/badge/skills/psd401/psd-claude-plugins/hallmark.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 258 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 16,641 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 94% copy Near-identical to another mod 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.

Model	Per session	Once invoked
Fable 5.1	$0.00258	$0.16641
Opus 5.5	$0.00103	$0.06656
Sonnet 5.5	$0.00052	$0.03328
Haiku 4.5	$0.00026	$0.01664

Measured 14d ago against content hash 83286e0420a5, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

hallmark 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 14d 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.

Origin

This is a copy

94% identical to hallmark — 624 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

plugins/psd-coding-system/skills/hallmark/SKILL.md · 589 lines

How it starts

The opening of the file, as written. The whole thing — 589 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Hallmark

Attribution. Vendored from nutlope/hallmark — authored by Hassan El Mghari (nutlope), made by Together AI, copyright "Hallmark contributors". Upstream v1.1.0, commit 13ac0ec (2026-08-06), vendored 2026-08-22. Upstream is MIT licensed; the license text travels with this copy as LICENSE.upstream, which satisfies the MIT attribution requirement.

PSD adaptations (rule-set text is unmodified):

Frontmatter rewritten for the PSD plugin standard (model / effort / extended-thinking, narrowed description so it doesn't collide with /lfg, added argument-hint).

site/css/tokens.css vendored to references/tokens.css — a functional dependency, not a doc link: 16 of the 21 themes exist only as token blocks in that file.

docs/recipes.md and docs/study-examples.md vendored to references/.

Links to upstream site/examples/ and site/_tests/ builds repointed at GitHub (not vendored).

A design skill for AI coding assistants. Makes the UIs they generate look made, not generated.

Hallmark is opinionated, short, and boring on purpose. It encodes a tight set of rules — drawn from the consensus of the anti-AI-slop design field (Anthropic's frontend-design skill, the Claude cookbook on frontend aesthetics, and the 2026 "tactile rebellion" movement) — and refuses to let the model fall back to the defaults every LLM was trained on.

The differentiator: Hallmark insists on structural variety, not just visual variety. Two pages by Hallmark for two different briefs should not share the same hero → 3-feature → CTA → footer rhythm. They should feel like different sites, not different colour-swaps of the same template. See references/structure.md.

Powered by Together AI.

How to use this skill

Hallmark has one default behaviour and three explicit verbs.

Invocation	What it does
(default)	The user asked you to design or build something new. Follow the Design flow below.
`hallmark audit <target>`	Read the target, score it against the anti-pattern list, return a ranked punch list. Do not edit.
`hallmark redesign <target> [--mood <name>]`	Take the target's content and intent, then redesign the visual structure inside the existing implementation boundaries unless the user explicitly confirms a full rebuild. New section rhythm, new heading placement, new component voice. Preserve existing routes, component ownership, copy intent, brand, and information architecture; replace only the visual/interaction layer needed for the requested scope.
`hallmark study <screenshot \| URL>`	The user pasted or attached an image of a design they admire, or pasted a URL to a live page. Extract the DNA — macrostructure, archetypes, type-pairing, colour anchor — and produce a diagnosis report, then optionally rebuild the user's content using the extracted DNA or emit a portable `design.md` of the DNA. Detection is automatic: a URL (`http://` / `https://` prefix) routes to URL mode; anything else routes to image mode. URL mode reads the page's HTML and CSS via WebFetch — it can name exact fonts and exact colour values, but can't judge rhythm. After the diagnosis, the user has three follow-ups: build with the DNA (handoff to default), lock the DNA into a portable `design.md` (opt-in via "lock the DNA" / "give me a design.md"), or stop at the diagnosis. Never copies pixels. Refuses template-marketplace URLs. Tighter refusal layer for `design.md` emission than for the diagnosis itself — URL-mode emission requires attestation that the source is the user's own or a public reference for their own brand. Falls back to asking for a screenshot if the URL is auth-walled, a JS-only SPA shell, or otherwise un-readable. Load `references/study.md` before this verb runs.

Read the full file on GitHub · 589 lines

Files

What ships with it

60 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.

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.

14d ago Changed · -1 lines 83286e0420a5
1mo ago Changed 1863e01dc475
2mo ago First seen · 590 lines · 258 tokens per session scan A d55d5e4678b8

Subscribe to this mod's changes

hallmark is a skill published in the GitHub repository psd401/psd-claude-plugins (2 stars, last pushed 9d ago), licensed MIT. It adds 258 tokens to every session and 16,641 once invoked, about $0.0010 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 94% identical to hallmark, differing in 624 lines, and is treated as a copy.

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