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

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

Good fit Checking suspected SQL injection, cross-site scripting, blind vulnerabilities, and subdomain takeovers, then recording human-reproduced proof.

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Install with agentmods
npx agentmods add skills/iamsecure1920/cordon-ai/cordon-validate
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 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/github.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/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 cordon-validate

Your own site · 80×15
<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="Reviewed on agentmods" width="80" 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. 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 $0.00054 $0.00827
Opus 5.5 $0.00022 $0.00331
Sonnet 5.5 $0.00011 $0.00165
Haiku 4.5 $0.00005 $0.00083

Measured 1mo ago against content hash d0cdedde7025, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, 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 1mo 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. 1mo 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 1mo ago), licensed MIT. It adds 54 tokens to every session and 827 once invoked, about $0.0002 per session on Opus 5.5. 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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