# Skanna

> Security-scan a Claude Code skill, plugin, or MCP server BEFORE installing or trusting it: reads the SKILL.md, scripts, hooks, and manifests and returns a SAFE / CAUTION / DANGEROUS verdict with file:line reasons. Read-only, zero cost, never executes the target. Use when the user says /skanna, pastes a marketplace or GitHub link to vet, asks whether a skill, plugin, zip, or MCP server is safe to…

- **Type:** Skill
- **Install:** `agentstack add skill-proluct-skanna-skanna`
- **Verified:** Pending review
- **Seller:** [proluct](https://agentstack.voostack.com/s/proluct)
- **Installs:** 0
- **Category:** [Developer Tools](https://agentstack.voostack.com/c/developer-tools)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [proluct](https://github.com/proluct)
- **Source:** https://github.com/proluct/skanna/tree/main/skills/skanna

## Install

```sh
agentstack add skill-proluct-skanna-skanna
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# skanna

**Security-scan a skill or plugin before you trust it.** Skills, plugins, and MCP servers are code plus instructions that you install into an agent holding your shell, your files, and your credentials. That is an attack surface: auto-firing hooks, install scripts piped from the network, credential theft, prompt injection. Point skanna at a local folder or a remote repo URL; read everything yourself and return a **SAFE / CAUTION / DANGEROUS** verdict with reasons.

```
/skanna https://github.com/someone/cool-skill
/skanna ~/.claude/skills/foo
/skanna ./downloaded-plugin/
```

## Argument

- **A remote URL** -> shallow-clone to a temp dir **outside any active project tree** and scan there.
- **A local path** -> scan in place.
- **Nothing** -> ask for the URL or path.

## Hard rules

1. **NEVER execute anything from the target.** No `npm install`, no `postinstall`, no running an install or update script, no invoking the skill, no `pip install`. Read-only inspection only. Running the thing to see what it does is exactly how you get owned.
2. **Clone shallow, to temp, outside any working repo.** `git clone --depth 1 ` into a temp dir (e.g. `mktemp -d`). Never clone inside a working repo: auto-commit hooks and sync tools make that a hazard.
3. **Default to suspicion.** A false positive costs two minutes; a missed compromise costs the machine. When unsure whether something is risky, flag it.
4. **You cannot trust what you cannot read.** Instructions in a language you cannot read, minified blobs, and encoded payloads are findings in themselves. Translate or decode what you can and report what it actually says.

## Steps

1. **Acquire** the files locally, read-only, per the rules above.
2. **Inventory** the target: every `SKILL.md` and instruction `.md`, hooks (`.mjs` `.js` `.sh` `.ps1`, `hooks.json`), `package.json` (read `scripts`, especially `postinstall` and `preinstall`), `.mcp.json` and MCP server manifests, plugin manifests (`.claude-plugin/`), install or update scripts, and any binaries. List what you found; a binary you cannot read is itself a CAUTION.
3. **Load the rules.** Read every file under `references/rules/`. Each file is one danger family: what to look for, why it is dangerous, and what benign look-alikes to not flag. Apply all of them to the inventory.
4. **Scan.** Work through the files against every rule family. Collect findings as: what, where (`file:line`), why it is risky, and the severity floor from the rule file.
5. **Verdict.**
   - **DANGEROUS**: any finding at danger severity, or any combination the rules call a hard no-install (for example secret access paired with an outbound request).
   - **CAUTION**: caution-level findings only, or content that could not be read (foreign language, obfuscation, binaries).
   - **SAFE**: no findings. SAFE means "nothing found", not a certification.
6. **Report** using the locked format in [references/report-format.md](references/report-format.md). For CAUTION or DANGEROUS, say what to strip or sandbox before use, and call out any single finding that is a hard no-install on its own. End with a clear go / no-go if the user is about to install it.
7. **Clean up**: if you cloned to temp, delete the temp dir after scanning.

## Failure modes

- **Empty or tiny target**: a repo with just a README is not scannable as a skill; say so instead of issuing SAFE.
- **Huge target**: inventory first, then prioritize hooks, scripts, manifests, and every instruction file. Say explicitly if anything was skipped and why; a skipped file caps the verdict at CAUTION.
- **The target is itself a scanner or security tool**: pattern mentions (like a rules list naming `curl | bash`) are not findings. Judge what the code DOES, not what it talks about. The rule files describe how to tell the difference.
- **Scanning something already installed**: same procedure via the local path; the verdict includes whether to uninstall.

## Conventions

- Zero-cost and self-contained: no API key, no external scanner, no dependencies. Read and reason; that is the whole point.
- Conversation language follows the user; the verdict keywords stay SAFE / CAUTION / DANGEROUS so reports are comparable.

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [proluct](https://github.com/proluct)
- **Source:** [proluct/skanna](https://github.com/proluct/skanna)
- **License:** MIT

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** yes
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: flagged — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-proluct-skanna-skanna
- Seller: https://agentstack.voostack.com/s/proluct
- Browse the marketplace: https://agentstack.voostack.com/browse

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Listed on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.