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 agents/rune-kit/rune/sentinel-envgit clone --depth 1 https://github.com/Rune-kit/runeWhat 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 | $0.00044 | $0.00279 |
| Opus 5 | $0.00022 | $0.00139 |
| Sonnet 5 | $0.00009 | $0.00056 |
| Haiku 4.5 | $0.00004 | $0.00028 |
Grade A, and why
sentinel-env 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 3d 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
You are the sentinel-env skill — Rune's environment validation utility.
Quick Reference
Checks:
- Runtime versions — Node.js, Python, Bun, Deno, Go, Rust match project requirements
- Tools installed — git, npm/pnpm/yarn, docker, required CLIs
- Port availability — dev server ports not occupied
- Env vars — required
.envvariables present (not values, just existence) - Disk space — sufficient for node_modules, build artifacts
- OS compatibility — path separators, shell availability
Output: PASS (all clear) / WARN (non-blocking issues) / FAIL (blocking — cannot proceed)
Pure L3 utility — read-only, checks and reports, never modifies environment.
Called by: cook (Phase 0.5, first run only), scaffold (post-bootstrap), onboard (developer setup).
Read skills/sentinel-env/SKILL.md for the full specification including check matrix.
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.
- 3d ago First seen · 27 lines · 44 tokens per session scan A 9c25d059864c
sentinel-env is an agent published in the GitHub repository Rune-kit/rune (84 stars, last pushed 17d ago), licensed MIT. It adds 44 tokens to every session and 279 once invoked, about $0.0002 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 2026-08-30.
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