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/guihai24/openskills/sentinelnpx skills add guihai24/openskills --skill sentinelgit clone --depth 1 https://github.com/guihai24/openskillsWrote 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/guihai24/openskills/sentinel)<a href="https://agentmods.dev/skills/guihai24/openskills/sentinel"><img src="https://agentmods.dev/badge/skills/guihai24/openskills/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 5.1 | $0.00070 | $0.02887 |
| Opus 5 | $0.00035 | $0.01443 |
| Sonnet 5 | $0.00014 | $0.00577 |
| Haiku 4.5 | $0.00007 | $0.00289 |
Grade B, and why
sentinel scanned grade B with 3 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 6d 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.
Asks for rootlowPrivilege escalation
A mod that escalates privileges can change anything on the machine, not only the project.
• Requesting sudo privileges Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.
Reads agent configuration directorieslowAgent snooping
.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.
Add to `~/.claude/settings.json`: Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
• curl/wget to unknown URLs How it starts
The opening of the file, as written. The whole thing — 349 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Sentinel — Unified Security Protection
All security capabilities in one place. 4 modules, automatic triggers, users only make traffic-light decisions.
Module Overview
| Module | Function | Trigger |
|---|---|---|
| M1 | Skill security review | Auto-triggered before skill installation |
| M2 | Dependency install interception (3-layer) | PreToolUse + PostToolUse Hook |
| M3 | Project dependency audit | /sentinel check or periodic |
| M4 | System security inspection | /sentinel audit or daily cron |
M1: Skill Security Review
Inherits all skill-vetter capabilities + enhancements
Trigger
User requests to install a skill (from ClawdHub, GitHub, or other sources), or agent detects skill installation intent.
Step 1: Source Verification
Answer the following:
- Source? (ClawdHub / GitHub / other)
- Is the author well-known / trusted?
- Star count / download count?
- Last updated?
- Any user reviews?
Step 2: Code Review (mandatory)
Read all files in the skill. Check against the following red-line checklist (any match → flag immediately):
Base Red Lines (inherited from skill-vetter)
🚨 Flag on match:
─────────────────────────────────────────
• curl/wget to unknown URLs
• Sending data to external servers
• Requesting credentials/tokens/API keys
• Reading ~/.ssh, ~/.aws, ~/.config (without clear justification)
• Accessing MEMORY.md, USER.md, SOUL.md, IDENTITY.md
• Using base64 decode
• Using eval()/exec() on external input
• Modifying system files outside workspace
• Installing undeclared packages
• Network calls using IP addresses instead of domains
• Obfuscated code (compressed, encoded, minified)
• Requesting sudo privileges
• Accessing browser cookies/sessions
• Touching credential files
Enhanced Red Lines (sentinel additions)
🚨 Additional checks:
─────────────────────────────────────────
• Contains .pth files
• Large base64/hex encoded content (>100 chars)
• Modifies CLAUDE.md or settings.json (privilege escalation)
• Registers Claude Code Hooks (can hijack other operations)
• scripts/ contains network calls (curl, wget, fetch, requests)
→ Check target URLs against known-malicious.md
• Introduces external dependencies → chain to M2 for each dependency
What ships with it
10 files beside SKILL.md 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.
- _meta.json 79 B
- hooks/sentinel-pre-install.sh 2.5 KB runs code
- references/known-malicious.md 1.8 KB
- references/red-flags.md 2.1 KB
- references/suspicious-patterns.md 2.5 KB
- scripts/audit-deps.sh 5.5 KB runs code
- scripts/check-package.sh 8.4 KB runs code
- scripts/download-and-inspect.sh 7.4 KB runs code
- scripts/quick-audit.sh 6.8 KB runs code
- scripts/scan-installed.sh 7.3 KB runs code
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.
- 6d ago First seen · 349 lines · 70 tokens per session scan B 690eb72da4da
sentinel is a skill published in the GitHub repository guihai24/openskills (2 stars, last pushed 4d ago), licensed MIT. It adds 70 tokens to every session and 2,887 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it B with 3 findings (asks for root, reads agent configuration directories, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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