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openpeon: Instructions file for Claude Code

CLAUDE.md

openpeon CLAUDE.md is an instructions file for Claude Code from PeonPing/openpeon. It costs 648 tokens per session, scanned A, original, MIT.

A project guide for OpenPeon, an open standard for sounds that coding tools can play when work finishes, fails, or needs input. It covers the sound-pack format, website, registry, and tests.

In plain words
What is it for?
Building and linting the website, validating sound-pack schemas, updating registry-related scripts, and understanding how pack data is served.
Why use it?
It gives contributors the directory map, build commands, and validation rules needed to change the project safely.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md.

This is PeonPing/openpeon's own configuration. It tells Claude Code how to work on openpeon itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything openpeon configures →

not rated 110repo +1 1mo ago A scan 648 tokens original MIT
View source ↗ PeonPing/openpeon openpeon.com
Reuse

Borrowing it

Nothing to install: this file belongs to PeonPing/openpeon. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/PeonPing/openpeon/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/PeonPing/openpeon

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.

agentmods badge for openpeon CLAUDE.md

README.md
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Your own site
<a href="https://agentmods.dev/instructions/peonping/openpeon/claude-md"><img src="https://agentmods.dev/badge/instructions/peonping/openpeon/claude-md/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 openpeon CLAUDE.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/peonping/openpeon/claude-md"><img src="https://agentmods.dev/badge/instructions/peonping/openpeon/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 648 This file is loaded in full into every session.
When invoked 648 The same file — it is already loaded in full.
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00648 $0.00648
Opus 5.5 $0.00259 $0.00259
Sonnet 5.5 $0.00130 $0.00130
Haiku 4.5 $0.00065 $0.00065

Measured 2mo ago against content hash 4f01ff3891c7, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

openpeon CLAUDE.md 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 2mo 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.md · 40 lines

How it starts

The opening of the file, as written. The whole thing — 40 lines — stays where its author put it; the contents beside it link to each section on GitHub.

OpenPeon

OpenPeon is an open standard (CESP v1.0) for coding event sounds. Any agentic IDE or terminal editor can implement CESP to give developers audio feedback when tasks complete, errors occur, or input is needed.

Key Directories

  • spec/ -- CESP v1.0 specification, JSON schemas (openpeon.schema.json for pack manifests, registry-entry.schema.json for registry entries)
  • examples/ -- Example sound packs (peon, glados) that validate against the schemas
  • site/ -- Next.js site deployed to openpeon.com via Vercel
  • scripts/ -- Cross-repo utility scripts (update-pack-counts.sh for syncing pack counts)
  • docs/ -- Architecture documents (registry-design.md, download-tracking-plan.md, plans/)
  • tests/ -- Schema validation tests

Build Commands

Site (from site/ directory)

  • npm run dev -- Start dev server
  • npm run build -- Production build
  • npm run lint -- ESLint

Tests (from repo root)

  • npm test -- Run all tests (schema validation)
  • npm run test:schema -- Run schema validation tests only

Architecture Notes

  • Pack data is fetched at request time with ISR, not at build time. site/src/lib/registry.ts fetches the registry index from peonping.github.io/registry/index.json, then each pack's openpeon.json manifest from GitHub raw URLs, with bounded concurrency and retries. Fetches are cached with revalidate: 86400 (24h) under REGISTRY_TAG.
  • A malformed community manifest is dropped with a [registry] dropping pack ... console warning rather than failing the render. If the live site shows far fewer packs than the registry, check the deploy logs for these warnings.
  • site/src/app/api/revalidate/route.ts accepts a POST with an x-revalidate-secret header and busts the registry cache tag. It only works once REVALIDATE_SECRET is set in the Vercel project env; until then a fresh vercel --prod deploy is the way to reset the ISR cache.
  • Audio files are served directly from GitHub raw URLs (no local copies).
  • The site is deployed to Vercel; the Vercel project's root directory is site/, so run vercel from the REPO ROOT, not from site/.
  • Schemas use JSON Schema Draft 7.
  • CI (.github/workflows/ci.yml) runs root schema tests plus site lint and build on every push/PR to main.

Read the full file on GitHub · 40 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.

  1. 2mo ago First seen · 40 lines · 648 tokens per session scan A 4f01ff3891c7

Subscribe to this mod's changes

openpeon CLAUDE.md is an instructions file published in the GitHub repository PeonPing/openpeon (110 stars, last pushed 1mo ago), licensed MIT. It adds 648 tokens to every session, about $0.0026 per session on Opus 5.5. 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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