skill-guard

skill-guard is an agent for coding agents from giggsoinc/raven. It costs 56 tokens per session (288 once invoked), scanned A, original, MIT.

A security checker for coding skills that monitors access to sensitive project files and settings.

In plain words
What is it for?
It protects environment files, secret manifests, private keys, settings, and the main Raven manifest, while checking the project's approved-skill list.
Why use it?
It prevents skills from reading secrets or changing protected configuration without approval. It also warns when a loaded skill is not listed as approved.

Agent

Part of the raven plugin — 28 skills, 13 commands, 10 agents, 5 hooks, 1 MCP server shipped together

Install

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.

agentmods
npx agentmods add agents/giggsoinc/raven/skill-guard
Clone the repo
git clone --depth 1 https://github.com/giggsoinc/raven

Or install raven, the plugin that ships this one along with the rest of its 28 skills, 13 commands, 10 agents, 5 hooks, 1 MCP server.

Wrote 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.

agentmods badge for skill-guard

README.md
[![agentmods](https://agentmods.dev/badge/agents/giggsoinc/raven/skill-guard.svg)](https://agentmods.dev/agents/giggsoinc/raven/skill-guard)
Your own site
<a href="https://agentmods.dev/agents/giggsoinc/raven/skill-guard"><img src="https://agentmods.dev/badge/agents/giggsoinc/raven/skill-guard.svg" alt="Measured on agentmods" height="20"></a>
Per session 56 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 288 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00056 $0.00288
Opus 5 $0.00028 $0.00144
Sonnet 5 $0.00011 $0.00058
Haiku 4.5 $0.00006 $0.00029

Measured 3d ago against content hash 8014e9654440, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

skill-guard 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.

agents/skill-guard.md · 32 lines

What it actually says

Skill Guard — Sensitive File Protection

Monitored files (no skill may read or modify)

  • .raven/manifest.secrets.json
  • .env .env.*
  • *.pem *.key id_rsa id_ed25519
  • .claude/settings.json — read-only, no skill may modify
  • .raven/manifest.json — read-only for skills, modify via /raven-approve only

On detection

If any skill attempts restricted file access:

  1. HARD BLOCK immediately
  2. Warn: "⚠️ Skill {name} attempted restricted access to {file} — blocked"
  3. Log: skill name, file, timestamp
  4. Instruct developer to audit and remove the skill

Approved skills check (on session start)

Read manifest.approved_skills. Any loaded skill not in list: → WARN: "Unapproved skill: {name} — add to manifest.approved_skills to permit"

Changes

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.

  1. 3d ago First seen · 32 lines · 56 tokens per session scan A 8014e9654440

Subscribe to this mod's changes

skill-guard is an agent published in the GitHub repository giggsoinc/raven (5 stars, last pushed 3d ago), licensed MIT. It adds 56 tokens to every session and 288 once invoked, about $0.0003 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.