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.
npx agentmods add skills/iplug3/audio-plugin-dev-skills/check-codesignnpx skills add iPlug3/audio-plugin-dev-skills --skill check-codesigngit clone --depth 1 https://github.com/iPlug3/audio-plugin-dev-skillsWhat 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 | $0.00098 | $0.02046 |
| Opus 5 | $0.00049 | $0.01023 |
| Sonnet 5 | $0.00020 | $0.00409 |
| Haiku 4.5 | $0.00010 | $0.00205 |
Grade A, and why
check-codesign 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 3d 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.
How it starts
The opening of the file, as written. The whole thing — 216 lines — stays where its author put it; the contents beside it link to each section on GitHub.
macOS Code Signature Check
Why This Matters
macOS DAWs built with hardened runtime (Logic Pro, GarageBand, recent versions of Ableton Live, etc.) will refuse to load unsigned or incorrectly signed plugins. Gatekeeper and library validation enforcement mean that even a plugin passing all functional tests can silently fail to load if its code signature is missing, invalid, or lacks required entitlements.
Plugin Bundle Locations
| Format | Extension | Typical Paths |
|---|---|---|
| AudioUnit v2 | .component |
~/Library/Audio/Plug-Ins/Components/, /Library/Audio/Plug-Ins/Components/ |
| AudioUnit v3 | .appex (inside .app) |
Built into host app bundle |
| VST3 | .vst3 |
~/Library/Audio/Plug-Ins/VST3/, /Library/Audio/Plug-Ins/VST3/ |
| CLAP | .clap |
~/Library/Audio/Plug-Ins/CLAP/, /Library/Audio/Plug-Ins/CLAP/ |
Instructions
- Locate the plugin bundle on disk
- Run
codesign -vvv --deep --strict /path/to/plugin.bundleto verify the signature - Run
codesign -d --verbose=4 /path/to/plugin.bundleto display signing details - Check for hardened runtime flag in the output (flags should include
runtime) - Run
codesign -d --entitlements - /path/to/plugin.bundleto inspect entitlements - If the plugin is distributed outside the App Store, check notarization with
spctl --assess - See Common Issues below if verification fails
Basic Usage
# Verify the code signature is valid (deep checks nested code)
codesign -vvv --deep --strict /path/to/plugin.vst3
# Display full signing information
codesign -d --verbose=4 /path/to/plugin.vst3
# Display entitlements
codesign -d --entitlements - /path/to/plugin.vst3
# Display just the signing identity (Team ID and certificate name)
codesign -d --verbose=1 /path/to/plugin.vst3
Checking Hardened Runtime
Hardened runtime is required for notarization and for loading into DAWs that enforce library validation.
# Check flags — look for "runtime" in the flags line
codesign -d --verbose=4 /path/to/plugin.vst3
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.
- 3d ago First seen · 216 lines · 98 tokens per session scan A 32f5dcde389c
check-codesign is a skill published in the GitHub repository iPlug3/audio-plugin-dev-skills (88 stars, last pushed 6mo ago), licensed MIT. It adds 98 tokens to every session and 2,046 once invoked, about $0.0005 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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