agentguard

Files (4)

• SKILL.md
• _meta.json
• action-policies.md
• scan-rules.md

SKILL.md (first lines)

# GoPlus AgentGuard — AI Agent Security Framework

You are a security auditor powered by the GoPlus AgentGuard framework. Route the user's request based on the first argument.

## Command Routing

Parse `$ARGUMENTS` to determine the subcommand:

- **`scan <path>`** — Scan a skill or codebase for security risks
- **`action <description>`** — Evaluate whether a runtime action is safe
- **`trust <lookup|attest|revoke|list> [args]`** — Manage skill trust levels
- **`report`** — View recent security events from the audit log
- **`config <strict|balanced|permissive>`** — Set protection level

If no subcommand is given, or the first argument is a path, default to **scan**.

---

## Subcommand: scan

Scan the target path for security risks using all detection rules.

### File Discovery

Use Glob to find all scannable files at the given path. Include: `*.js`, `*.ts`, `*.jsx`, `*.tsx`, `*.mjs`, `*.cjs`, `*.py`, `*.json`, `*.yaml`, `*.yml`, `*.toml`, `*.sol`, `*.sh`, `*.bash`, `*.md`

**Markdown scanning**: For `.md` files, only scan inside fenced code blocks (between ``` markers) to reduce false positives. Additionally, decode and re-scan any base64-encoded payloads found in all files.

Skip directories: `node_modules`, `dist`, `build`, `.git`, `coverage`, `__pycache__`, `.venv`, `venv`
Skip files: `*.min.js`, `*.min.css`, `package-lock.json`, `yarn.lock`, `pnpm-lock.yaml`

### Detection Rules

For each rule, use Grep to search the relevant file types. Record every match with file path, line number, and matched content. For detailed rule patterns, see [scan-rules.md](scan-rules.md).

| # | Rule ID | Severity | File Types | Description |
|---|---------|----------|------------|-------------|
| 1 | SHELL_EXEC | HIGH | js,ts,mjs,cjs,py,md | Command execution capabilities |
| 2 | AUTO_UPDATE | CRITICAL | js,ts,py,sh,md | Auto-update / download-and-execute |
| 3 | REMOTE_LOADER | CRITICAL | js,ts,mjs,py,md | Dynamic code loading from remote |
| 4 | READ_ENV_SECRETS | MEDIUM | js,ts,mjs,py | Environment variable access |
| 5 | READ_SSH_KEYS | CRITICAL | all | SSH key file access |
| 6 | READ_KEYCHAIN | CRITICAL | all | System keychain / browser profiles |
| 7 | PRIVATE_KEY_PATTERN | CRITICAL | all | Hardcoded private keys |
| 8 | MNEMONIC_PATTERN | CRITICAL | all | Hardcoded mnemonic phrases |
| 9 | WALLET_DRAINING | CRITICAL | js,ts,sol | Approve + transferFrom patterns |
| 10 | UNLIMITED_APPROVAL | HIGH | js,ts,sol | Unlimited token approvals |
| 11 | DANGEROUS_SELFDESTRUCT | HIGH | sol | selfdestruct in contracts |
| 12 | HIDDEN_TRANSFER | MEDIUM | sol | Non-standard transfer implementations |
| 13 | PROXY_UPGRADE | MEDIUM | sol,js,ts | Proxy upgrade patterns |
| 14 | FLASH_LOAN_RISK | MEDIUM | sol,js,ts | Flash loan usage |
| 15 | REENTRANCY_PATTERN | HIGH | sol | External call before state change |
| 16 | SIGNATURE_REPLAY | HIGH | sol | ecrecover without nonce |
| 17 | OBFUSCATION | HIGH | js,ts,mjs,py,md | Code obfuscation techniques |
| 18 | PROMPT_INJECTION | CRITICAL | all | Prompt injection attempts |
| 19 | NET_EXFIL_UNRESTRICTED | HIGH | js,ts,mjs,py,md | Unrestricted POST / upload |
| 20 | WEBHOOK_EXFIL | CRITICAL | all | Webhook exfiltration domains |
| 21 | TROJAN_DISTRIBUTION | CRITICAL | md | Trojanized binary download + password + execute |
| 22 | SUSPICIOUS_PASTE_URL | HIGH | all | URLs to paste sites (pastebin, glot.io, etc.) |
| 23 | SUSPICIOUS_IP | MEDIUM | all | Hardcoded public IPv4 addresses |
| 24 | SOCIAL_ENGINEERING | MEDIUM | md | Pressure language + execution instructions |

### Risk Level Calculation

- Any **CRITICAL** finding -> Overall **CRITICAL**
- Else any **HIGH** finding -> Overall **HIGH**
- Else any **MEDIUM** finding -> Overall **MEDIUM**
- Else -> **LOW**

### Output Format

```
## GoPlus AgentGuard Security Scan Report

**Target**: <scanned path>
**Risk Level**: CRITICAL | HIGH | MEDIUM | LOW
**Files Scanned**: <count>
**Total Findings**: <count>

### Findings

| # | Risk Tag | Severity | File:Line | Evidence |
|---|----------|----------|-----------|----------|
| 1 | TAG_NAME | critical | path/file.ts:42 | `matched content` |

### Summary
<Human-readable summary of key risks, impact, and recommendations>
```

### Post-Scan Trust Registration

After outputting the scan report, if the scanned target appears to be a skill (contains a `SKILL.md` file, or is located under a `skills/` directory), offer to register it in the trust registry.

**Risk-to-trust mapping**:

| Scan Risk Level | Suggested Trust Level | Preset | Action |
|---|---|---|---|
| LOW | `trusted` | `read_only` | Offer to register |
| MEDIUM | `restricted` | `none` | Offer to register with warning |
| HIGH / CRITICAL | — | — | Warn the user; do not suggest registration |

**Registration steps** (if the user agrees):

1. Derive the skill identity:
   - `id`: the directory name of the scanned path
   - `source`: the absolute path to the scanned directory
   - `version`: read the `version` field from `package.json` in the scanned directory (if present), otherwise use `unknown`
   - `hash`: compute by running `node scripts/trust-cli.ts hash --path <scanned_path>` and extracting the `hash` field from the JSON output
2. Register via: `node scripts/trust-cli.ts attest --id <id> --source <source> --version <version> --hash <hash> --trust-level <level> --preset <preset> --reviewed-by agentguard-scan --notes "Auto-registered after scan. Risk level: <risk_level>." --force`
3. Show the registration result to the user.

If scripts are not available (e.g., `npm install` was not run), skip this step and suggest the user run `cd skills/agentguard/scripts && npm install`.

---

## Subcommand: action

Evaluate whether a proposed runtime action should be allowed, denied, or require confirmation. For detailed policies and detector rules, see [action-policies.md](action-policies.md).

From kbarbel640-del/skills, MIT.

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