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/core0-io/nioWrote 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/core0-io/nio/claude-code)<a href="https://agentmods.dev/plugins/core0-io/nio/claude-code"><img src="https://agentmods.dev/badge/plugins/core0-io/nio/claude-code/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/core0-io/nio/claude-code"><img src="https://agentmods.dev/badge/plugins/core0-io/nio/claude-code.svg" alt="Reviewed on agentmods" width="80" height="20"></a>Grade A, and why
nio 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": "nio",
"version": "2.5.1",
"description": "Nio — Execution assurance and observability for autonomous AI agents. Dynamic guard, static scan, OTEL collector.",
"author": {
"name": "core0-io",
"url": "https://github.com/core0-io"
},
"homepage": "https://github.com/core0-io/nio",
"repository": "https://github.com/core0-io/nio",
"license": "Apache-2.0",
"keywords": ["nio", "nio-agent-guard", "agent-guard", "nio-agent-harness", "agent-harness", "ai-agent-harness", "ai-agent-security", "llm-agent-safety", "prompt-injection-defense", "mcp-security", "runtime-protection", "execution-assurance", "agent-observability", "agent-protection", "claude-code", "scanner", "otel"]
}
What it installs
The manifest is a name and a version. 7 skills, 8 hooks travel with it, and installing the plugin installs all of them — 555 tokens a session between them. Each is measured on its own page, and each can be installed alone.
- Skill nio-scan A 81 tokens
- Skill nio-action A 83 tokens
- Skill nio-external-score A 97 tokens
- Skill nio-doctor A 75 tokens
- Skill nio-report A 72 tokens
- Skill nio-config A 71 tokens
- Skill nio B 76 tokens
- Hook SessionStart A not measured
- Hook PreToolUse A not measured
- Hook SubagentStop A not measured
- Hook TaskCreated A not measured
- Hook UserPromptSubmit A not measured
- Hook Stop A not measured
- Hook PostToolUse A not measured
- Hook TaskCompleted A not measured
What ships with it
1 file beside plugin.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.
- 1mo ago First seen · 14 lines scan A f3c6937782ad
nio is a plugin published in the GitHub repository core0-io/nio (20 stars, last pushed 1mo 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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