ghost-scan-deps — Claude Code skill: what it does, how to install

---
name: "ghost-scan-deps"
description: |
  Ghost Security - Software Composition Analysis (SCA) scanner. Scans dependency lockfiles for known vulnerabilities, identifies CVEs, and generates findings with severity levels and remediation guidance. Use when the user asks about dependency vulnerabilities, vulnerable packages, CVE checks, security audits of dependencies, or wants to scan lockfiles like package-lock.json, yarn.lock, go.mod, or Gemfile.lock.
allowed-tools: Read, Glob, Grep, Bash, Task, TodoRead, TodoWrite
argument-hint: "[path-to-scan]"
license: apache-2.0
metadata:
  version: 1.1.0
---

# Ghost Security SCA Scanner — Orchestrator

You are the top-level orchestrator for Software Composition Analysis (SCA) scanning. Your ONLY job is to call the Task tool to spawn subagents to do the actual work. Each step below gives you the exact Task tool parameters to use. Do not do the work yourself.

## Defaults

- **repo_path**: the current working directory
- **scan_dir**: `~/.ghost/repos/<repo_id>/scans/<short_sha>/deps`
- **short_sha**: `git rev-parse --short HEAD` (falls back to `YYYYMMDD` for non-git dirs)

$ARGUMENTS

Any values provided above override the defaults.

---

## Execution

1. **Setup** — compute paths and create output directories
2. **Initialize Wraith** — install the wraith binary
3. **Discover Lockfiles** — find all dependency lockfiles in the repo
4. **Scan for Vulnerabilities** — run wraith against each lockfile
5. **Analyze Candidates** — assess exploitability of each candidate
6. **Summarize Results** — generate the final scan report

### Step 0: Setup

Run this Bash command to compute the repo-specific output directory, create it, and locate the skill files:
```
repo_name=$(basename "$(pwd)") && remote_url=$(git remote get-url origin 2>/dev/null || pwd) && short_hash=$(printf '%s' "$remote_url" | git hash-object --stdin | cut -c1-8) && repo_id="${repo_name}-${short_hash}" && short_sha=$(git rev-parse --short HEAD 2>/dev/null || date +%Y%m%d) && ghost_repo_dir="$HOME/.ghost/repos/${repo_id}" && scan_dir="${ghost_repo_dir}/scans/${short_sha}/deps" && cache_dir="${ghost_repo_dir}/cache" && mkdir -p "$scan_dir/findings" && skill_dir=$(find . -path '*skills/scan-deps/SKILL.md' 2>/dev/null | head -1 | xargs dirname) && echo "scan_dir=$scan_dir cache_dir=$cache_dir skill_dir=$skill_dir"
```

Store `scan_dir` (the absolute path under `~/.ghost/repos/`), `cache_dir` (the repo-level cache directory), and `skill_dir` (the absolute path to the skill directory containing `agents/`, `scripts/`, etc.).

After this step, your only remaining tool is Task. Do not use Bash, Read, Grep, Glob, or any other tool for Steps 1–5.

### Step 1: Initialize Wraith

Call the Task tool to initialize the wraith binary:
```json
{
  "description": "Initialize wraith binary",
  "subagent_type": "general-purpose",
  "prompt": "You are the init agent. Read and follow the instructions in <skill_dir>/agents/init/agent.md.\n\n## Inputs\n- skill_dir: <skill_dir>"
}
```

The init agent installs wraith to `~/.ghost/bin/wraith` (or `wraith.exe` on Windows).

### Step 2: Discover Lockfiles

Call the Task tool to discover lockfiles in the repository:
```json
{
  "description": "Discover lockfiles",
  "subagent_type": "general-purpose",
  "prompt": "You are the discover agent. Read and follow the instructions in <skill_dir>/agents/discover/agent.md.\n\n## Inputs\n- repo_path: <repo_path>\n- scan_dir: <scan_dir>"
}
```

The discover agent finds all lockfiles (go.mod, package-lock.json, etc.) and writes `<scan_dir>/lockfiles.json`.

**If lockfile count is 0**: Skip to Step 5 (Summarize) with no lockfiles found.

### Step 3: Scan for Vulnerabilities

Call the Task tool to run the wraith scanner:
```json
{
  "description": "Scan for vulnerabilities",
  "subagent_type": "general-purpose",
  "prompt": "You are the scan agent. Read and follow the instructions in <skill_dir>/agents/scan/agent.md.\n\n## Inputs\n- repo_path: <repo_path>\n- scan_dir: <scan_dir>"
}
```

The scan agent executes wraith for each lockfile and writes `<scan_dir>/candidates.json`.

**If candidate count is 0**: Skip to Step 5 (Summarize) with no vulnerabilities found.

### Step 4: Analyze Candidates

Call the Task tool to analyze the vulnerability candidates:
```json
{
  "description": "Analyze vulnerability candidates",
  "subagent_type": "general-purpose",
  "prompt": "You are the analysis agent. Read and follow the instructions in <skill_dir>/agents/analyze/agent.md.\n\n## Inputs\n- repo_path: <repo_path>\n- scan_dir: <scan_dir>\n- skill_dir: <skill_dir>\n- cache_dir: <cache_dir>"
}
```

The analysis agent spawns parallel analyzers for each candidate to assess exploitability and writes finding files to `<scan_dir>/findings/`.

### Step 5: Summarize Results

Call the Task tool to summarize the findings:
```json
{
  "description": "Summarize scan results",
  "subagent_type": "general-purpose",
  "prompt": "You are the summarize agent. Read and follow the instructions in <skill_dir>/agents/summarize/agent.md.\n\n## Inputs\n- repo_path: <repo_path>\n- scan_dir: <scan_dir>\n- skill_dir: <skill_dir>\n- cache_dir: <cache_dir>"
}
```

After executing all the tasks, report the scan results to the user.

---

## Error Handling

If any Task call fails, retry it **once**. If it fails again, stop and report the failure.