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.
git clone --depth 1 https://github.com/kastelldev/kastellWrote 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/plugins/kastelldev/kastell/kastell-plugin)<a href="https://agentmods.dev/plugins/kastelldev/kastell/kastell-plugin"><img src="https://agentmods.dev/badge/plugins/kastelldev/kastell/kastell-plugin/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/plugins/kastelldev/kastell/kastell-plugin"><img src="https://agentmods.dev/badge/plugins/kastelldev/kastell/kastell-plugin.svg" alt="Reviewed on agentmods" width="80" height="20"></a>Grade A, and why
kastell 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 1mo 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": "kastell",
"version": "2.3.0",
"description": "Autonomous server security and infrastructure management. First-party MCP tools for cloud server provisioning, security auditing, hardening, backup, and fleet management across Hetzner, DigitalOcean, Vultr, and Linode.",
"author": {
"name": "kastelldev"
},
"homepage": "https://kastell.dev",
"repository": "https://github.com/kastelldev/kastell",
"keywords": [
"server",
"security",
"infrastructure",
"mcp",
"audit",
"hardening",
"vps",
"cloud"
]
}
What it installs
The manifest is a name and a version. 4 skills, 1 agent, 4 hooks, 1 MCP server travel with it, and installing the plugin installs all of them — 228 tokens a session between them. Each is measured on its own page, and each can be installed alone.
- Skill kastell-ops A 53 tokens
- Skill kastell-scaffold A 41 tokens
- Skill kastell-research A 42 tokens
- Skill kastell-careful A 26 tokens
- Agent kastell-auditor A 66 tokens
- Hook PreToolUse A not measured
- Hook PostToolUse A not measured
- Hook Stop A not measured
- Hook SessionStart A not measured
- MCP server kastell A not measured
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.
- 1mo ago First seen · 21 lines scan A 124f7b80a358
kastell is a plugin published in the GitHub repository kastelldev/kastell (60 stars, last pushed 10d ago), licensed Apache-2.0. 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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