review-security

review-security is a skill for Codex from Phelan164/codex-howto. It costs 73 tokens per session (436 once invoked), scanned A, original, MIT.

A security review of application and infrastructure changes that follows data from user-controlled inputs to sensitive operations. It examines trust boundaries, permissions, secrets, and other security controls.

In plain words
What is it for?
Use it for security-focused pull-request reviews and for changes involving authentication, authorization, tenant separation, parsers, URLs, files, commands, serialization, or secrets.
Why use it?
It focuses reviews on realistic ways an attacker could cause harm instead of reporting checklist items without a reachable attack path.

Skill for Codex

Written for Codex: agents/openai.yaml present.

Good fit Use it for security-focused pull-request reviews and for changes involving authentication, authorization, tenant separation, parsers, URLs, files, commands, serialization, or secrets.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/phelan164/codex-howto/review-security
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 Phelan164/codex-howto --skill review-security
Clone the repo
git clone --depth 1 https://github.com/Phelan164/codex-howto

Made for: 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 review-security

README.md
[![agentmods](https://agentmods.dev/badge/skills/phelan164/codex-howto/review-security.svg)](https://agentmods.dev/skills/phelan164/codex-howto/review-security)
Your own site
<a href="https://agentmods.dev/skills/phelan164/codex-howto/review-security"><img src="https://agentmods.dev/badge/skills/phelan164/codex-howto/review-security.svg" alt="Measured on agentmods" height="20"></a>
Per session 73 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 436 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 $0.00073 $0.00436
Opus 5 $0.00036 $0.00218
Sonnet 5 $0.00015 $0.00087
Haiku 4.5 $0.00007 $0.00044

Measured 8d ago against content hash 4eb555141d87, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

review-security 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.

skills/review-security/SKILL.md · 53 lines

What it actually says

Review Security

Workflow

  1. Establish the review target, intended behavior, and relevant threat model.
  2. Identify assets, trust boundaries, actors, entry points, and sensitive operations.
  3. Trace attacker-controlled data to security-relevant sinks.
  4. Inspect authentication, authorization, tenant isolation, and privilege changes.
  5. Evaluate realistic exploitability and existing controls.
  6. Validate suspected findings safely with read-only analysis or sandboxed tests when authorized.
  7. Return prioritized findings with evidence, impact, prerequisites, and remediation direction.

Guardrails

  • Work read-only by default.
  • Do not access production systems, real customer data, or private credentials.
  • Do not publish weaponized exploit details or active secrets.
  • Avoid checklist-only findings without a reachable attack path.
  • Distinguish a missing defense-in-depth measure from an exploitable vulnerability.
  • Treat dependency scanner output as leads requiring context.
  • Keep proof-of-concept activity scoped, reversible, and authorized.

Threat checklist

Read references/threat-checklist.md for changes involving identity, parsers, URLs, files, commands, serialization, secrets, data boundaries, CI, or cloud permissions.

Finding standard

Include:

  • severity and confidence;
  • affected asset and trust boundary;
  • attacker prerequisites;
  • source-to-sink or authorization path;
  • impact;
  • exact code location;
  • safe reproduction guidance when appropriate;
  • remediation and verification direction.

Acceptance criteria

  • Findings describe realistic attack paths.
  • Authorization and tenant boundaries are explicitly reviewed.
  • Sensitive data handling is traced through logs and storage.
  • False positives and assumptions are called out.
  • No live exploitation or unauthorized write occurred.
  • Residual risk and unreviewed surfaces are explicit.
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. 8d ago First seen · 53 lines · 73 tokens per session scan A 4eb555141d87

Subscribe to this mod's changes

review-security is a skill published in the GitHub repository Phelan164/codex-howto (3 stars, last pushed 3d ago), licensed MIT. It adds 73 tokens to every session and 436 once invoked, about $0.0004 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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