A specification-writing process for defining the visual details of assets such as icons, illustrations, animations, app icons, and splash screens.

Use it to create individual asset briefs and maintain a central list of assets needed for a product or screen.

It turns product requirements and approved design rules into instructions that a designer or image-generation tool can follow.

asset-spec — Skill for Claude Code by cenconq25

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 cenconq25/claude-code-app-studio --skill asset-spec

Clone the repo

git clone --depth 1 https://github.com/cenconq25/claude-code-app-studio

Made for: Claude Code.

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/cenconq25/claude-code-app-studio/asset-spec.svg)](https://agentmods.dev/skills/cenconq25/claude-code-app-studio/asset-spec)

Your own site

<a href="https://agentmods.dev/skills/cenconq25/claude-code-app-studio/asset-spec"><img src="https://agentmods.dev/badge/skills/cenconq25/claude-code-app-studio/asset-spec.svg" alt="Measured on agentmods" height="20"></a>

Per session 67 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,300 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.

Model	Per session	Once invoked
Fable 5.1	$0.00067	$0.02300
Opus 5	$0.00034	$0.01150
Sonnet 5	$0.00013	$0.00460
Haiku 4.5	$0.00007	$0.00230

Measured 8d ago against content hash 9b2a5f4ca125, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

asset-spec 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 8d 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.

.claude/skills/asset-spec/SKILL.md · 279 lines

How it starts

The opening of the file, as written. The whole thing — 279 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Asset Spec

Bridges design and asset production. For each asset (icon, illustration, animation, app icon, splash, hero image), this skill produces a spec the asset producer (designer or AI tool) can act on, plus an AI-gen prompt seeded from the design bible.

Outputs:

design/assets/<asset-name>.md — per-asset spec
design/assets/manifest.md — running list of assets

Purpose / When to Run

Run when:

The design bible has been approved
A UX spec or PRD calls for specific assets (illustrations, icons, hero images, animations)
The team needs production-ready specs for a designer or for AI generation

Inputs

Asset name OR system/screen scope
design/design-bible.md (required for tokens and style anchors)
Source PRD or UX spec
Existing manifest if any

Outputs

design/assets/<asset-name>.md per asset
design/assets/manifest.md updated with new entries

Phase 1: Resolve Scope

Argument forms:

<asset-name> — single asset (e.g., empty-state-projects)
system:<system> — all assets called out in a system PRD
screen:<screen> — all assets in a UX spec
app-icon — app icon spec (special case, full size matrix)
splash — splash / launch screen spec

If no argument: ask via AskUserQuestion.

Phase 2: Gather Sources

Read:

The design bible (full — the asset spec must reference its tokens and style anchor)
The relevant PRD or UX spec (full)
Existing design/assets/manifest.md if it exists

If design bible is missing, stop:

"No design/design-bible.md found. Asset specs without a bible drift from brand. Run /design-bible first."

Phase 3: Inventory Assets

For system: / screen: modes, scan the source doc and identify every visual asset called out:

Illustrations (empty states, onboarding visuals, hero images)
Icons not from the system family (custom glyphs)
Animations (Lottie / Rive / video)
Photographs (if used)
Decorative elements (patterns, textures)

For each, record: implied use, location in source doc.

Read the full file on GitHub · 279 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.

8d ago First seen · 279 lines · 67 tokens per session scan A 9b2a5f4ca125

Subscribe to this mod's changes

asset-spec is a skill published in the GitHub repository cenconq25/claude-code-app-studio (40 stars, last pushed 4mo ago), licensed MIT. It adds 67 tokens to every session and 2,300 once invoked, about $0.0003 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.

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