cordon-validate

cordon-validate is a skill for Claude Code, Codex from iamsecure1920/Cordon-AI. It costs 54 tokens per session (827 once invoked), scanned A, original, MIT.

A Cordon workflow for validating suspected security problems with the smallest proof needed to confirm them. A proof of concept is a repeatable demonstration that a vulnerability is real.

In plain words
What is it for?
Checking suspected SQL injection, cross-site scripting, blind vulnerabilities, and subdomain takeovers, then recording human-reproduced proof.
Why use it?
It separates confirmed problems from guesses and avoids unnecessary data access or extraction during testing.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/iamsecure1920/cordon-ai/cordon-validate
Any agent
npx skills add iamsecure1920/Cordon-AI --skill cordon-validate
Clone the repo
git clone --depth 1 https://github.com/iamsecure1920/Cordon-AI

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 cordon-validate

README.md
[![agentmods](https://agentmods.dev/badge/skills/iamsecure1920/cordon-ai/cordon-validate.svg)](https://agentmods.dev/skills/iamsecure1920/cordon-ai/cordon-validate)
Your own site
<a href="https://agentmods.dev/skills/iamsecure1920/cordon-ai/cordon-validate"><img src="https://agentmods.dev/badge/skills/iamsecure1920/cordon-ai/cordon-validate.svg" alt="Measured on agentmods" height="20"></a>
Per session 54 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 827 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00054 $0.00827
Opus 5 $0.00027 $0.00413
Sonnet 5 $0.00011 $0.00165
Haiku 4.5 $0.00005 $0.00083

Measured 3d ago against content hash d0cdedde7025, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

cordon-validate 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 3d 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.

skills/cordon-validate/SKILL.md · 91 lines

How it starts

The opening of the file, as written. The whole thing — 91 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Cordon validation

No PoC, no finding. A candidate becomes confirmed only through validate_findings, poc_record, or takeover_confirm. Nothing else can set that status.

The rule that governs every PoC

The smallest proof that settles the question.

Proving SQL injection means showing 1 AND 1=1 and 1 AND 1=2 differ, or that a SLEEP(5) delays the response. It does not mean dumping the users table. The extra step adds no evidence, converts a clean report into a data-handling incident, and is exactly what programs mean by "do not exfiltrate".

This is enforced, not advised: sqlmap's data-extraction flags (--dump, --dbs, --tables, --file-read) are absent from its argument allowlist. No approval can produce an extraction run.

Automatic validation

validate_findings(min_severity="medium")     # exploit mode, needs approval
xss_validate(url)                            # dalfox, verifies execution
sqli_validate(url)                           # detection only
oob_listener()                               # callback domain for blind classes

Validators run in parallel, one per vulnerability class. Each returns proven or not-proven with a reason. Not-proven downgrades the finding to needs_manual_review with that reason attached — which is a useful result, not a failure.

Classes that need a human, by design

Class Why automation stops
IDOR / authz Proving it means reading another user's data
Auth bypass Proving it means being someone else
RCE Proving it means executing code on their host
Blind SSRF Needs an out-of-band listener and injection context

For these, reproduce by hand with the least impact that demonstrates the issue, then:

poc_record(
  finding_id=...,
  reproduction="GET /api/users/2 with user A's session cookie",
  expected_result="403 Forbidden",
  observed_result="200 OK returning user B's email address",
  impact_limit_note="Read one adjacent record to prove the flaw; nothing retained.",
)

Read the full file on GitHub · 91 lines

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. 3d ago First seen · 91 lines · 54 tokens per session scan A d0cdedde7025

Subscribe to this mod's changes

cordon-validate is a skill published in the GitHub repository iamsecure1920/Cordon-AI (0 stars, last pushed today), licensed MIT. It adds 54 tokens to every session and 827 once invoked, about $0.0003 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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