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 skarn-security/agent-guardnpx agentmods add plugins/skarn-security/agent-guard/marketplacegit clone --depth 1 https://github.com/skarn-security/agent-guardGrade A, and why
skarn 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
{
"$schema": "https://anthropic.com/claude-code/marketplace.schema.json",
"name": "skarn",
"description": "Skarn security guard for AI coding assistants",
"owner": {
"name": "Skarn",
"url": "https://getskarn.com"
},
"plugins": [
{
"name": "skarn-guard",
"description": "Real-time pre-execution secret and exfiltration guard for Claude Code (audit mode), with the skarn-audit skill.",
"author": {
"name": "Skarn",
"url": "https://getskarn.com"
},
"category": "security",
"source": "./claude",
"homepage": "https://getskarn.com"
},
{
"name": "skarn-guard-codex",
"description": "Real-time pre-execution secret and exfiltration guard for Codex CLI (audit mode), with the skarn-audit skill.",
"author": {
"name": "Skarn",
"url": "https://getskarn.com"
},
"category": "security",
"source": "./codex",
"homepage": "https://getskarn.com"
},
{
"name": "skarn-recall",
"description": "Reconstruct what you worked on from your AI coding sessions: recent, stats, and redacted export. Reads session content, so it ships separately from the guard.",
"author": {
"name": "Skarn",
"url": "https://getskarn.com"
},
"category": "productivity",
"source": "./recall",
"homepage": "https://getskarn.com"
}
]
}
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 · 45 lines scan A 31b4bcf66588
skarn is a plugin published in the GitHub repository skarn-security/agent-guard (31 stars, last pushed 5d 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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