mini-apps

mini-apps is a skill for Claude Code, Codex from stagewise-io/stagewise. It costs 37 tokens per session (849 once invoked), scanned A, original, AGPL-3.0.

Guidance for building mini apps, small interactive web applications shown in browser tabs. It covers project setup, iframe limits, and messages exchanged between the app and its surrounding sandbox.

In plain words
What is it for?
Scaffolding browser-based mini apps, handling iframe constraints, and implementing two-way messaging between the app and its host environment.
Why use it?
It explains the browser and sandbox boundaries that can otherwise make an embedded app fail to load or communicate correctly.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing.

Good fit Scaffolding browser-based mini apps, handling iframe constraints, and implementing two-way messaging between the app and its host environment.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/stagewise-io/stagewise/mini-apps
About the project

stagewise is an open-source agentic IDE that combines a coding agent, browser-based app previews, debugging tools, and git workflows in one development environment. Developers use it to build and inspect applications with models from different providers. Catalogue add-ons extend the IDE's agent workflows.

stagewise-io/stagewise · 6,809 stars · on GitHub · stagewise.io

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 stagewise-io/stagewise --skill mini-apps
Clone the repo
git clone --depth 1 https://github.com/stagewise-io/stagewise

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 mini-apps

README.md
[![agentmods](https://agentmods.dev/badge/skills/stagewise-io/stagewise/mini-apps/github.svg)](https://agentmods.dev/skills/stagewise-io/stagewise/mini-apps)
Your own site
<a href="https://agentmods.dev/skills/stagewise-io/stagewise/mini-apps"><img src="https://agentmods.dev/badge/skills/stagewise-io/stagewise/mini-apps/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.

agentmods 80×15 button for mini-apps

Your own site · 80×15
<a href="https://agentmods.dev/skills/stagewise-io/stagewise/mini-apps"><img src="https://agentmods.dev/badge/skills/stagewise-io/stagewise/mini-apps.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 37 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 849 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. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
Origin unknown 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 5.1 $0.00037 $0.00849
Opus 5 $0.00018 $0.00425
Sonnet 5 $0.00007 $0.00170
Haiku 4.5 $0.00004 $0.00085

Measured 9d ago against content hash a128c2bf3e02, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

mini-apps 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 9d 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.

apps/browser/bundled/plugins/mini-apps/SKILL.md · 85 lines

The source is not reproduced here

Licensed AGPL-3.0

The repository is licensed AGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

Files

What ships with it

2 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.

  1. 9d ago First seen · 85 lines · 37 tokens per session scan A a128c2bf3e02

Subscribe to this mod's changes

mini-apps is a skill published in the GitHub repository stagewise-io/stagewise (6,809 stars, last pushed today), licensed AGPL-3.0. It adds 37 tokens to every session and 849 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 2026-08-30.

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