miniapp

miniapp is a skill for Claude Code, Codex from yc-software/qm. It costs 25 tokens per session (172 once invoked), scanned A, original, MIT.

Build a tiny interactive HTML playground only when someone asks to see, play with, or step through a mechanism.

Skill for Claude CodeCodex

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/yc-software/qm/miniapp
Any agent
npx skills add yc-software/qm --skill miniapp
Clone the repo
git clone --depth 1 https://github.com/yc-software/qm

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 miniapp

README.md
[![agentmods](https://agentmods.dev/badge/skills/yc-software/qm/miniapp.svg)](https://agentmods.dev/skills/yc-software/qm/miniapp)
Your own site
<a href="https://agentmods.dev/skills/yc-software/qm/miniapp"><img src="https://agentmods.dev/badge/skills/yc-software/qm/miniapp.svg" alt="Measured on agentmods" height="20"></a>
Per session 25 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 172 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 $0.00025 $0.00172
Opus 5 $0.00013 $0.00086
Sonnet 5 $0.00005 $0.00034
Haiku 4.5 $0.00003 $0.00017

Measured yesterday against content hash f77193511f5b, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

miniapp 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 yesterday.

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-seed/miniapp/SKILL.md · 16 lines

What it actually says

Miniapp

In a web conversation, use the miniapp tool for a focused, one-screen interactive explanation, simulation, or small game. The tool is intentionally unavailable on surfaces that cannot render playground artifacts.

  • Keep HTML, CSS, and JavaScript self-contained.
  • Do not use network requests, external assets, modules, or servers.
  • Make controls keyboard-accessible and label them clearly.
  • Let the document choose its own presentation; the host will not rewrite it.
  • Do not put a marker or artifact URL in the reply. The client attaches the playground from the typed tool result.
  • Use publish instead when the app needs persistence, a server, or multiple routes.
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. yesterday First seen · 16 lines · 25 tokens per session scan A f77193511f5b

Subscribe to this mod's changes

miniapp is a skill published in the GitHub repository yc-software/qm (14,428 stars, last pushed yesterday), licensed MIT. It adds 25 tokens to every session and 172 once invoked, about $0.0001 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 2026-09-02.

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