security-recon

security-recon is a skill for Claude Code, Codex from ewwhardik/nirikshak. It costs 97 tokens per session (557 once invoked), scanned A, original, MIT.

A security-recon skill for checking the publicly visible security and technical setup of a website or domain that the user owns or is allowed to test.

In plain words
What is it for?
It helps check security headers, TLS, subdomains, domain records, detected technologies, takeover risks, and—when explicitly requested—open ports or services.
Why use it?
It brings several checks into one report and highlights what changed since the previous scan, helping reveal newly exposed or misconfigured parts of a site.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit It helps check security headers, TLS, subdomains, domain records, detected technologies, takeover risks, and—when explicitly requested—open ports or services.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/ewwhardik/nirikshak/skill
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 ewwhardik/nirikshak --skill skill
Clone the repo
git clone --depth 1 https://github.com/ewwhardik/nirikshak

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 security-recon

README.md
[![agentmods](https://agentmods.dev/badge/skills/ewwhardik/nirikshak/skill/github.svg)](https://agentmods.dev/skills/ewwhardik/nirikshak/skill)
Your own site
<a href="https://agentmods.dev/skills/ewwhardik/nirikshak/skill"><img src="https://agentmods.dev/badge/skills/ewwhardik/nirikshak/skill/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 security-recon

Your own site · 80×15
<a href="https://agentmods.dev/skills/ewwhardik/nirikshak/skill"><img src="https://agentmods.dev/badge/skills/ewwhardik/nirikshak/skill.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 97 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 557 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 $0.00097 $0.00557
Opus 5 $0.00048 $0.00279
Sonnet 5 $0.00019 $0.00111
Haiku 4.5 $0.00010 $0.00056

Measured 8d ago against content hash 9c8ad73473ea, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

security-recon 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 8d 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.

skill/SKILL.md · 58 lines

What it actually says

nirikshak — security recon report

Before doing anything

Confirm the target is something the user owns or is authorized to test. If that's not obvious from context, ask before scanning.

Default flow

For most requests, just call full_surface_scan(target). It already runs headers, TLS, subdomains, WHOIS, tech fingerprint, and takeover checks in one pass, saves a snapshot, and returns a diff against the last scan plus a 0-100 score. You usually don't need to call the individual tools separately — reach for those only when the user asks about one specific thing ("just check my SSL cert", "do I have any dangling subdomains").

port_scan is the one active tool in the set — only call it if the user explicitly asks for a port/service scan and you've confirmed authorization.

Writing the report

Lead with the score and grade, then the diff since last scan (this is the part that matters most — a fresh set of findings is useful, but "here's what changed" is the actual value of running this repeatedly). Then the findings, ordered by real severity:

Score: 81/100 (B)

Since last scan (3 days ago):
- ⚠️ Content-Security-Policy header disappeared
- New subdomain: staging-old.example.com

Findings:
- Missing Permissions-Policy header — restricts camera/mic/geolocation access; add it
- TLS cert expires in 28 days — renew soon

Attack surface: 6 subdomains, stack looks like React + Cloudflare

Rules:

  • No unexplained jargon — one clause of plain English per finding.
  • Every finding gets a fix, not just a description.
  • If a check errored (nmap missing, crt.sh rate-limited, etc.), say so plainly instead of silently dropping that section.
  • Don't invent findings that aren't in the tool output.

Guardrails

This is a passive recon + drift-detection skill, not an attack tool. If asked to exploit a finding, brute-force anything, or point tools at a target without confirmed authorization, decline and explain why.

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. 8d ago First seen · 58 lines · 97 tokens per session scan A 9c8ad73473ea

Subscribe to this mod's changes

security-recon is a skill published in the GitHub repository ewwhardik/nirikshak (2 stars, last pushed 1mo ago), licensed MIT. It adds 97 tokens to every session and 557 once invoked, about $0.0005 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 2026-08-31.

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