mockup

mockup is a skill for Claude Code, Codex from GentBajko/capstone. It costs 31 tokens per session (89 once invoked), scanned A, original, Apache-2.0.

A guided process for defining a new product idea through an interview and recording the result as a traceable Markdown mockup.

In plain words
What is it for?
Use it to explore a product's purpose, business plan, and use cases, then produce a mockup that links the design back to those decisions.
Why use it?
It turns loosely formed product ideas into documented decisions, business assumptions, and example scenarios.

Skill for Claude CodeCodex

Part of the capstone plugin — 16 skills, 2 hooks shipped together

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.

agentmods
npx agentmods add skills/gentbajko/capstone/mockup
Any agent
npx skills add GentBajko/capstone --skill mockup
Clone the repo
git clone --depth 1 https://github.com/GentBajko/capstone

Made for: Claude Code, Codex.

Or install capstone, the plugin that ships this one along with the rest of its 16 skills, 2 hooks.

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 mockup

README.md
[![agentmods](https://agentmods.dev/badge/skills/gentbajko/capstone/mockup.svg)](https://agentmods.dev/skills/gentbajko/capstone/mockup)
Your own site
<a href="https://agentmods.dev/skills/gentbajko/capstone/mockup"><img src="https://agentmods.dev/badge/skills/gentbajko/capstone/mockup.svg" alt="Measured on agentmods" height="20"></a>
Per session 31 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 89 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00031 $0.00089
Opus 5 $0.00015 $0.00044
Sonnet 5 $0.00006 $0.00018
Haiku 4.5 $0.00003 $0.00009

Measured 4d ago against content hash 930a5e2843a3, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

mockup 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 4d 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/mockup/SKILL.md · 12 lines

What it actually says

Capstone: mockup

From this skill's base directory, read ../core/references/core.md and ../core/references/core-authoring.md, then execute ../core/references/protocols/mockup.md exactly.

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. 4d ago First seen · 12 lines · 31 tokens per session scan A 930a5e2843a3

Subscribe to this mod's changes

mockup is a skill published in the GitHub repository GentBajko/capstone (2 stars, last pushed 5d ago), licensed Apache-2.0. It adds 31 tokens to every session and 89 once invoked, about $0.0002 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 2026-08-31.

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