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.
/plugin marketplace add tyunta/prefab-sentinelnpx agentmods add plugins/tyunta/prefab-sentinel/marketplacegit clone --depth 1 https://github.com/tyunta/prefab-sentinelGrade A, and why
tyunta-prefab-sentinel 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 2d 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.
What it actually says
{
"name": "tyunta-prefab-sentinel",
"owner": {
"name": "tyunta"
},
"interface": {
"displayName": "Prefab Sentinel"
},
"plugins": [
{
"name": "prefab-sentinel",
"description": "An MCP server specialized for VRChat avatar and world projects: it parses the asset YAML directly — including UdonSharp's split program/behaviour structure — to detect and repair broken references, prefab Variant override drift, and null wiring across prefabs, scenes, and materials. Built for AI agents, every fix runs through a dry-run → confirm gate with an audit log, so asset YAML is never hand-edited.",
"source": "./",
"policy": {
"installation": "AVAILABLE",
"authentication": "ON_INSTALL"
},
"category": "Coding"
}
]
}
What ships with it
1 file beside marketplace.json 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.
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.
- 2d ago First seen · 22 lines scan A 2cfd1d3928ac
tyunta-prefab-sentinel is a plugin published in the GitHub repository tyunta/prefab-sentinel (11 stars, last pushed 17d ago), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. 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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