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/cardsorting/lumi-joy/security-sentinelnpx skills add CardSorting/LUMI-JOY --skill security-sentinelgit clone --depth 1 https://github.com/CardSorting/LUMI-JOYWrote 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/cardsorting/lumi-joy/security-sentinel)<a href="https://agentmods.dev/skills/cardsorting/lumi-joy/security-sentinel"><img src="https://agentmods.dev/badge/skills/cardsorting/lumi-joy/security-sentinel.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 | $0.00026 | $0.00145 |
| Opus 5 | $0.00013 | $0.00072 |
| Sonnet 5 | $0.00005 | $0.00029 |
| Haiku 4.5 | $0.00003 | $0.00015 |
Grade A, and why
security-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 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.
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
Security Sentinel
Security sentinel that analyzes ASTs for injection risks, verifies file path sandboxing, and prevents command tampering.
📋 Execution Protocol
- Analyze Input: Validate preconditions and inspect operational context.
- Execute Actions: Carry out procedures using deterministic tools.
- Verify Outcome: Assert correctness and log diagnostic telemetry.
🛡️ Operational Guardrails & Rules
- Execute with deterministic consistency and verify outputs.
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 · 20 lines · 26 tokens per session scan A bf3feea5d781
security-sentinel is a skill published in the GitHub repository CardSorting/LUMI-JOY (2 stars, last pushed 7d ago), licensed Apache-2.0. It adds 26 tokens to every session and 145 once invoked, about $0.0001 per session on Opus 5. 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 2026-08-31.
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