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/validate-vst3-editorhostnpx skills add iPlug3/audio-plugin-dev-skills --skill validate-vst3-editorhostgit clone --depth 1 https://github.com/iPlug3/audio-plugin-dev-skillsWrote 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.
[](https://agentmods.dev/skills/iplug3/audio-plugin-dev-skills/validate-vst3-editorhost)<a href="https://agentmods.dev/skills/iplug3/audio-plugin-dev-skills/validate-vst3-editorhost"><img src="https://agentmods.dev/badge/skills/iplug3/audio-plugin-dev-skills/validate-vst3-editorhost.svg" alt="Measured on agentmods" height="20"></a>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 5.1 | $0.00078 | $0.00872 |
| Opus 5 | $0.00039 | $0.00436 |
| Sonnet 5 | $0.00016 | $0.00174 |
| Haiku 4.5 | $0.00008 | $0.00087 |
Grade B, and why
validate-vst3-editorhost scanned grade B 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 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.
Asks for rootmediumPrivilege escalation
A mod that escalates privileges can change anything on the machine, not only the project.
sudo apt install libx11-dev libgtkmm-3.0-dev libxcb-util-dev libxcb-cursor-dev libxcb-keysyms1-dev libxcb-xkb-dev How it starts
The opening of the file, as written. The whole thing — 91 lines — stays where its author put it; the contents beside it link to each section on GitHub.
VST3 EditorHost
Minimal VST3 host for testing plugin UIs without a full DAW.
Plugin Install Locations
editorhost accepts a direct path to a .vst3 bundle.
| Platform | User Location | System Location |
|---|---|---|
| macOS | ~/Library/Audio/Plug-Ins/VST3/ |
/Library/Audio/Plug-Ins/VST3/ |
| Windows | %LOCALAPPDATA%\Programs\Common\VST3\ |
C:\Program Files\Common Files\VST3\ |
| Linux | ~/.vst3/ |
/usr/lib/vst3/ or /usr/local/lib/vst3/ |
Instructions
- Build EditorHost from the VST3 SDK if not already built (see Building EditorHost below)
- Run:
editorhost /path/to/plugin.vst3 - The plugin UI window should appear — verify layout, controls, and resizing
- Test multiple editor instances with
--secondWindow - If the UI doesn't appear, verify the plugin passes
validatortests first
Usage
# Basic usage - load plugin and show UI
editorhost /path/to/plugin.vst3
# With component handler (tests host callbacks)
editorhost --componentHandler /path/to/plugin.vst3
# Open second window (tests multiple editor instances)
editorhost --secondWindow /path/to/plugin.vst3
# Specify a particular effect class by UID
editorhost --uid "ABCD1234..." /path/to/plugin.vst3
Binary Locations
| Platform | Typical Path |
|---|---|
| macOS | <vst3sdk>/build/bin/Release/editorhost.app/Contents/MacOS/editorhost |
| Windows | <vst3sdk>\build\bin\Release\editorhost.exe |
| Linux | <vst3sdk>/build/bin/Release/editorhost |
Building EditorHost
Clone the VST3 SDK if you don't have it, then build:
cd <vst3sdk>
cmake -B build -G Ninja -DCMAKE_BUILD_TYPE=Release
cmake --build build --target editorhost
Linux: Requires X11 and GTK3 development libraries:
# Debian/Ubuntu
sudo apt install libx11-dev libgtkmm-3.0-dev libxcb-util-dev libxcb-cursor-dev libxcb-keysyms1-dev libxcb-xkb-dev
# Fedora
sudo dnf install libX11-devel gtkmm3.0-devel xcb-util-devel xcb-util-cursor-devel xcb-util-keysyms-devel libxkbcommon-x11-devel
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 · 91 lines · 78 tokens per session scan B a486bda5022a
validate-vst3-editorhost is a skill published in the GitHub repository iPlug3/audio-plugin-dev-skills (90 stars, last pushed 6mo ago), licensed MIT. It adds 78 tokens to every session and 872 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it B with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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