validate-vulnerability

validate-vulnerability is a skill for Claude Code, Codex from gaelic-ghost/socket. It costs 43 tokens per session (386 once invoked), scanned A, original, Apache-2.0.

A controlled process for proving or disproving a reported security weakness in an environment where testing is authorized. It uses a narrow hypothesis, comparison builds or configurations, and the least invasive reproduction.

In plain words
What is it for?
Use it to test scanner findings, CVEs, advisories, proof-of-concept code, configuration concerns, and suspected security regressions.
Why use it?
It distinguishes a vulnerable component from a weakness that an attacker can actually reach and control, while limiting possible harm during testing.

Skill for Claude CodeCodex

Part of the cybersecurity-skills plugin — 31 skills shipped together

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/gaelic-ghost/socket/validate-vulnerability
Any agent
npx skills add gaelic-ghost/socket --skill validate-vulnerability
Clone the repo
git clone --depth 1 https://github.com/gaelic-ghost/socket

Made for: Claude Code, Codex.

Or install cybersecurity-skills, the plugin that ships this one along with the rest of its 31 skills.

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 validate-vulnerability

README.md
[![agentmods](https://agentmods.dev/badge/skills/gaelic-ghost/socket/validate-vulnerability.svg)](https://agentmods.dev/skills/gaelic-ghost/socket/validate-vulnerability)
Your own site
<a href="https://agentmods.dev/skills/gaelic-ghost/socket/validate-vulnerability"><img src="https://agentmods.dev/badge/skills/gaelic-ghost/socket/validate-vulnerability.svg" alt="Measured on agentmods" height="20"></a>
Per session 43 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 386 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 $0.00043 $0.00386
Opus 5 $0.00022 $0.00193
Sonnet 5 $0.00009 $0.00077
Haiku 4.5 $0.00004 $0.00039

Measured yesterday against content hash 2b7e25216183, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

validate-vulnerability 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 yesterday.

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.

plugins/cybersecurity-skills/skills/validate-vulnerability/SKILL.md · 35 lines

What it actually says

Validate Vulnerability

Overview

Prove or refute the narrow claim with the least invasive reproduction. Separate vulnerable code or package presence from reachability, controllability, boundary crossing, and demonstrated impact.

Read references/validation-evidence.md for proof levels and controls.

Workflow

  1. Confirm authorization and exact target/build/configuration.
  2. State the hypothesis.
    • Define attacker position, controlled input, preconditions, code/endpoint, expected security property, and observable violation.
  3. Establish controls.
    • Prepare a known-vulnerable or claimed build, fixed/patched or negative build, baseline input, and minimally changed trigger when practical.
  4. Trace reachability.
    • Show how input reaches the affected component and whether authentication, feature flags, deployment topology, sanitization, mitigations, or dead code block it.
    • Use Codex Security for repository attack-path analysis when appropriate.
  5. Reproduce minimally.
    • Prefer harmless markers, bounded data, synthetic accounts, and local fixtures.
    • Stop before destructive impact, persistence, unrelated data access, lateral movement, or instability beyond scope.
  6. Capture evidence.
    • Record request/input, response/output, traces/logs, process or state change, exact tool/version, timestamps, cleanup, and retest.
  7. Classify.
    • Validated exploitable, validated but constrained, vulnerable component present but not reachable, false positive for this target, fixed, or unresolved.

Output

Return hypothesis, environment, controls, reachability, smallest safe proof, impact boundary, classification/confidence, cleanup, and remediation/retest criteria.

Files

What ships with it

2 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. yesterday First seen · 35 lines · 43 tokens per session scan A 2b7e25216183

Subscribe to this mod's changes

validate-vulnerability is a skill published in the GitHub repository gaelic-ghost/socket (7 stars, last pushed 9d ago), licensed Apache-2.0. It adds 43 tokens to every session and 386 once invoked, about $0.0002 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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