Playing notes and simple melodies through an on-screen piano.

It gives you a piano interface without needing a physical instrument.

virtual-piano — Skill for Claude Code and Codex by jegly: A virtual piano displayed for playing music on screen.

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/jegly/box/virtual-piano

Any agent

npx skills add jegly/Box --skill virtual-piano

Clone the repo

git clone --depth 1 https://github.com/jegly/Box

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/jegly/box/virtual-piano.svg)](https://agentmods.dev/skills/jegly/box/virtual-piano)

Your own site

<a href="https://agentmods.dev/skills/jegly/box/virtual-piano"><img src="https://agentmods.dev/badge/skills/jegly/box/virtual-piano.svg" alt="Measured on agentmods" height="20"></a>

Per session 11 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 142 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

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.

Model	Per session	Once invoked
Fable 5	$0.00011	$0.00142
Opus 5	$0.00005	$0.00071
Sonnet 5	$0.00002	$0.00028
Haiku 4.5	$0.00001	$0.00014

Measured 5d ago against content hash 9cd77f28e7d0, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

virtual-piano 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 5d 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/featured/virtual-piano/SKILL.md · 24 lines

The source is not reproduced here

No licence file

Read it on GitHub

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.

5d ago First seen · 24 lines · 11 tokens per session scan A 9cd77f28e7d0

Subscribe to this mod's changes

virtual-piano is a skill published in the GitHub repository jegly/Box (794 stars, last pushed yesterday), with no licence file. It adds 11 tokens to every session and 142 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 2026-08-30.

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