recon-for-sec

recon-for-sec is a skill for Claude Code, Codex from JustineDevs/premortem. It costs 41 tokens per session (312 once invoked), scanned A, a copy of recon-for-sec, Apache-2.0.

A starting guide for security reconnaissance on a new target. It routes you through checking scope, finding assets and services, identifying technologies, collecting endpoints, and selecting the next security tests.

In plain words
What is it for?
Use it for authorized target scoping, asset discovery, service identification, technology fingerprinting, endpoint inventory, and choosing follow-up security checks.
Why use it?
It gives you an ordered way to understand an unfamiliar attack surface before testing individual vulnerability types. This makes early security work more complete and repeatable.

Skill for Claude CodeCodex

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

Good fit Use it for authorized target scoping, asset discovery, service identification, technology fingerprinting, endpoint inventory, and choosing follow-up security checks.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/justinedevs/premortem/recon-for-sec
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 recon-for-sec
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 recon-for-sec

README.md
[![agentmods](https://agentmods.dev/badge/skills/justinedevs/premortem/recon-for-sec/github.svg)](https://agentmods.dev/skills/justinedevs/premortem/recon-for-sec)
Your own site
<a href="https://agentmods.dev/skills/justinedevs/premortem/recon-for-sec"><img src="https://agentmods.dev/badge/skills/justinedevs/premortem/recon-for-sec/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 recon-for-sec

Your own site · 80×15
<a href="https://agentmods.dev/skills/justinedevs/premortem/recon-for-sec"><img src="https://agentmods.dev/badge/skills/justinedevs/premortem/recon-for-sec.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 41 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 312 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 100% copy Near-identical to another mod 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 $0.00041 $0.00312
Opus 5 $0.00020 $0.00156
Sonnet 5 $0.00008 $0.00062
Haiku 4.5 $0.00004 $0.00031

Measured 7d ago against content hash 6128ba665cb2, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

recon-for-sec 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 7d 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.

Origin

This is a copy

100% identical to recon-for-sec — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.agents/skills/recon-for-sec/SKILL.md · 29 lines

What it actually says

Recon and Methodology Router

This is the starting router for new targets and unknown attack surfaces.

When to Use

  • You just received a new target and do not yet know what to test first
  • You need to begin with asset discovery, tech fingerprinting, endpoint inventory, and test-route planning
  • You want to build follow-up testing on structured methodology instead of random payload enumeration

Skill Map

  1. First confirm in-scope assets and target type
  2. Then perform asset discovery, port/service identification, technology fingerprinting, and endpoint collection
  3. Route based on collected findings to api-sec, auth-sec, injection-checking, or business-logic-vuln
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. 7d ago First seen · 29 lines · 41 tokens per session scan A 6128ba665cb2

Subscribe to this mod's changes

recon-for-sec is a skill published in the GitHub repository JustineDevs/premortem (2 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 41 tokens to every session and 312 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to recon-for-sec, differing in 0 lines, and is treated as a copy.

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