auv3

auv3 is a skill for Claude Code, Codex from Generous-Corp/pulp. It costs 57 tokens per session (19,120 once invoked), scanned C, original, MIT.

A guide for maintaining Pulp’s Audio Unit v3 adapter, which lets audio plug-ins run in Apple hosts such as Logic Pro and GarageBand. It covers audio, parameter, MIDI, sidechain, saved-state, and iOS extension connections.

In plain words
What is it for?
Use it when editing Pulp’s AUv3 adapter or iOS view code, investigating host behaviour, or checking an auval validation failure.
Why use it?
Audio Unit v3 has host-specific rules, and small wiring or packaging mistakes can cause missing controls, MIDI, sidechain input, or preset recovery.

Skill for Claude CodeCodex

Part of the pulp plugin — 63 skills, 30 commands, 3 hooks, 1 MCP server 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/generous-corp/pulp/auv3
Any agent
npx skills add Generous-Corp/pulp --skill auv3
Clone the repo
git clone --depth 1 https://github.com/Generous-Corp/pulp

Made for: Claude Code, Codex.

Or install pulp, the plugin that ships this one along with the rest of its 63 skills, 30 commands, 3 hooks, 1 MCP server.

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 auv3

README.md
[![agentmods](https://agentmods.dev/badge/skills/generous-corp/pulp/auv3.svg)](https://agentmods.dev/skills/generous-corp/pulp/auv3)
Your own site
<a href="https://agentmods.dev/skills/generous-corp/pulp/auv3"><img src="https://agentmods.dev/badge/skills/generous-corp/pulp/auv3.svg" alt="Measured on agentmods" height="20"></a>
Per session 57 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 19,120 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 1 finding. 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 $0.00057 $0.19120
Opus 5 $0.00028 $0.09560
Sonnet 5 $0.00011 $0.03824
Haiku 4.5 $0.00006 $0.01912

Measured today against content hash 4d8abdb6b021, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade C, and why

auv3 scanned grade C with 1 finding 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 today.

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.

Recursive force deletehighDestructive command

rm -rf with a variable or a broad path is one typo away from removing the wrong tree.

rm -rf ~/Library/Caches/AudioUnitCache/ \
.agents/skills/auv3/SKILL.md · 1,454 lines

How it starts

The opening of the file, as written. The whole thing — 1,454 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AU v3 Skill

Use this skill when touching Pulp's Audio Unit v3 adapter, when answering questions about how a Pulp plugin behaves inside Logic Pro, GarageBand, MainStage, AUM, Cubasis, or any AUv3-aware iOS host, or when an auval run fails. AU v3 is one of Pulp's three first-class first-party formats; unlike AU v2 (which is owned by the view-bridge skill via au_v2_adapter.cpp), AU v3 is the modern AUAudioUnit subclass surface.

When to use

  • Editing core/format/src/au_adapter.mm — the PulpAudioUnit AUAudioUnit subclass.
  • Editing core/format/src/au_entry.mm — the AUAudioUnitFactory-conforming entry object (PulpAUFactoryObj) and the PulpAUFactory component entry symbol.
  • Touching core/format/src/au_audio_unit.h — the Obj-C forward declaration used by au_entry.mm and the iOS view controller.
  • Editing the iOS extension view controller (core/format/src/au_view_controller_ios.mm) — but first read the ios and view-bridge skills; that file is also mapped to them.
  • An AUv3 host reports a behaviour issue — sidechain pull missing, sysex dropped, parameter tree blank, preset recall fails, MIDI-out not delivered.
  • An auval pass regresses.
  • Working on ARA-aware AU — but start with the ara skill; the AU story there is the audioUnitARAFactory KVO property.

AU v2 (core/format/src/au_v2_adapter.cpp) is a separate adapter covered by its own auv2 skill. AU v2 is AUEffectBase-based and used where hosts require the classic v2 Component Manager API. Do not edit au_v2_adapter.cpp as part of AU v3 work.

Files and entry points

Role Path
Core adapter (Obj-C++) core/format/src/au_adapter.mm
Forward declaration used by entry / view core/format/src/au_audio_unit.h
Component entry factory core/format/src/au_entry.mm
iOS AUv3 extension view controller core/format/src/au_view_controller_ios.mm (also mapped to ios + view-bridge skills)
iOS AU audio session helper core/format/src/ios_audio_session.cpp, core/format/include/pulp/format/ios_audio_session.{h,hpp}
Info.plist template (AU component bundle) tools/cmake/PulpInfoPlist.au.in
AudioUnitSDK fetch (used primarily by AU v2 but shared utilities reach AU v3) external/AudioUnitSDK (Apache 2.0)
Tests test/test_ios_audio_session.cpp, test/test_ios_background_audio_flag.cpp (iOS-specific); AU v3 shares state / processor tests with CLAP / VST3
CLI validator invocation tools/cli/cmd_validate.cpp — runs auval via the auval-<name> CTest target

Read the full file on GitHub · 1,454 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. today First seen · 1,454 lines · 57 tokens per session scan C 4d8abdb6b021

Subscribe to this mod's changes

auv3 is a skill published in the GitHub repository Generous-Corp/pulp (16 stars, last pushed today), licensed MIT. It adds 57 tokens to every session and 19,120 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it C with 1 finding (recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-04.

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