dast-automation

dast-automation is a skill for Claude Code, Codex from JustineDevs/premortem. It costs 81 tokens per session (2,165 once invoked), scanned A, original, Apache-2.0.

An automated guide for dynamic application security testing, which tests a running web application from the outside or with a logged-in session.

In plain words
What is it for?
It is for black-box or authenticated scans of one or more web domains, vulnerability discovery, scheduled testing, and CI/CD checks that block newly introduced serious issues.
Why use it?
It reduces the manual work of crawling sites and checking for vulnerabilities, while supporting repeatable scans and regression checks.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: mentions subagents; installed under .agents/ (shared by several agents).

Good fit It is for black-box or authenticated scans of one or more web domains, vulnerability discovery, scheduled testing, and CI/CD checks that block newly introduced serious issues.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/justinedevs/premortem/dast-automation
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.

Any agent
npx skills add JustineDevs/premortem --skill dast-automation
Clone the repo
git clone --depth 1 https://github.com/JustineDevs/premortem

Made for: Claude Code, Codex.

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 dast-automation

README.md
[![agentmods](https://agentmods.dev/badge/skills/justinedevs/premortem/dast-automation/github.svg)](https://agentmods.dev/skills/justinedevs/premortem/dast-automation)
Your own site
<a href="https://agentmods.dev/skills/justinedevs/premortem/dast-automation"><img src="https://agentmods.dev/badge/skills/justinedevs/premortem/dast-automation/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for dast-automation

Your own site · 80×15
<a href="https://agentmods.dev/skills/justinedevs/premortem/dast-automation"><img src="https://agentmods.dev/badge/skills/justinedevs/premortem/dast-automation.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 81 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,165 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00081 $0.02165
Opus 5 $0.00041 $0.01082
Sonnet 5 $0.00016 $0.00433
Haiku 4.5 $0.00008 $0.00216

Measured 9d ago against content hash 909359307918, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

dast-automation 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 9d ago.

The scan reads SKILL.md. This mod also ships 8 executable files (scripts/check_findings.py, scripts/continuous_dast.sh, scripts/dast_orchestrator.py, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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/skills/security/dast-automation/SKILL.md · 176 lines

How it starts

The opening of the file, as written. The whole thing — 176 lines — stays where its author put it; the contents beside it link to each section on GitHub.

DAST Automation with Playwright MCP

Thin router. Specific guidance lives in workflows/, methodology/, payloads/, and examples/. Read this file first, then lazy-load only the files you need for the task.

When to Use

  • Operator asks for a DAST / dynamic security scan of one or more web apps.
  • Blackbox external scan of a single domain.
  • Greybox (authenticated) scan with provided credentials.
  • Parallel scanning across a fleet of domains.
  • Setting up continuous / scheduled DAST with baseline diffing.
  • CI/CD integration to block regressions on new Critical/High issues.

Trigger Phrases

"scan ", "run DAST", "blackbox scan", "greybox scan", "authenticated pentest", "spider and test this app", "security-test these URLs", "weekly security scan", "continuous DAST".

When NOT to Use This Skill

  • Source-code SAST / dependency CVEs → use sast-automation / sca-automation.
  • Container image CVE scanning → use container-security.
  • IaC / Terraform / K8s manifest misconfig scanning → use iac-security.
  • Mobile app runtime testing (Frida, MASTG) → use mobile-security.
  • Network/host hardening audit without web surface → use network-audit.
  • Manual bug-bounty research on a single target → use this skill for surface mapping but switch to hackerone-research for narrative PoC work.

Decision Tree

Domains = 1 ──→ creds provided? ──→ no  → workflows/blackbox_single_domain.md
                                 └─→ yes → workflows/greybox_authenticated.md

Domains ≥ 2 ──→ one-shot scan ──→ workflows/multi_domain_parallel.md
            └→ recurring schedule ─→ workflows/continuous_scanning.md

Any mode ──→ emit schemas/finding.json → methodology/reporting.md

Parallelism Hints

Independent — run concurrently:

  • Phase 0 recon tools: nmap, whatweb, ffuf, subfinder, root-level nuclei.
  • Per-injection-class test batches (XSS, SQLi, SSRF, path traversal, CRLF) after crawl finishes.
  • One sub-agent per domain in multi-domain mode.
  • One sub-agent per low-priv account when running IDOR diff.

Read the full file on GitHub · 176 lines

Files

What ships with it

42 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 9d ago First seen · 176 lines · 81 tokens per session scan A 909359307918

Subscribe to this mod's changes

dast-automation is a skill published in the GitHub repository JustineDevs/premortem (2 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 81 tokens to every session and 2,165 once invoked, about $0.0004 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 2026-09-03.

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