secure-code-auditor: Instructions file for Codex

AGENTS.md

secure-code-auditor AGENTS.md is an instructions file for Codex, OpenCode from n-shadloo/secure-code-auditor. It costs 1,063 tokens per session, scanned A, original, MIT.

A security-review skill for backend code based on OWASP security guidance. OWASP is a nonprofit source of practical standards for finding and preventing common web-application vulnerabilities.

In plain words
What is it for?
Auditing backend applications, reviewing Django and Django REST Framework code, and checking security controls during implementation.
Why use it?
It helps identify security weaknesses and apply safer defaults while backend code is being written, including authentication, access control, injection, cryptography, and configuration.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: the file is AGENTS.md. Also seen: mentions Claude Code; mentions AGENTS.md; mentions Codex.

This is n-shadloo/secure-code-auditor's own configuration. It tells Codex and OpenCode how to work on secure-code-auditor itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything secure-code-auditor configures →

Reuse

Borrowing it

Nothing to install: this file belongs to n-shadloo/secure-code-auditor. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/n-shadloo/secure-code-auditor/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/n-shadloo/secure-code-auditor

Made for: Codex, OpenCode.

Wrote this? Show the measurements

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README.md
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Your own site
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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.

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<a href="https://agentmods.dev/instructions/n-shadloo/secure-code-auditor/agents-md"><img src="https://agentmods.dev/badge/instructions/n-shadloo/secure-code-auditor/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 1,063 This file is loaded in full into every session.
When invoked 1,063 The same file — it is already loaded in full.
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 $0.01063 $0.01063
Opus 5.5 $0.00425 $0.00425
Sonnet 5.5 $0.00213 $0.00213
Haiku 4.5 $0.00106 $0.00106

Measured 18d ago against content hash aed007ff787f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

secure-code-auditor AGENTS.md 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 18d 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.

AGENTS.md · 86 lines

How it starts

The opening of the file, as written. The whole thing — 86 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md

This repository is a backend security skill. The canonical instructions live in SKILL.md, which routes to the topic files under references/. An agent that works in this repository loads SKILL.md first. Then it reads only the references/*.md file(s) relevant to the task.

The primary integration is Claude (Anthropic Agent Skills). This file and its siblings let other agents use the same content. They are pointers, not copies. Where anything here disagrees with SKILL.md, SKILL.md wins.

Self-improvement

If this skill's text or script caused a mistake, or you had to find a step yourself, record it at once. Before you claim the task is done, end the report with Skill defects:. Section 0 of SELF-IMPROVEMENT.md gives the rules. If ~/.skill-improvements/secure-code-auditor/ exists, do section 3 first.

What this skill does

It reviews backend code for security issues, and it applies secure defaults while code is written. The corpus sits on the OWASP Top 10:2025 spine, with the API Security Top 10:2023 and ASVS 5.0 beside it. Each reference carries a stack-neutral principle layer and a deep Django and DRF layer. Every control is stated in a review form and a write-time form together.

The coverage spans the whole backend. It runs from the audit workflow and the entry-point inventory, through access control, authentication, injection, integrity, cryptography, and configuration. It reaches the API surfaces that are not DRF routes. It covers the database and data-lifecycle layers, service identity, deployment, file uploads, and agent and MCP tool surfaces. It also covers the auditing agent's own access. The SKILL.md router names each file's exact surface, so do not duplicate that list here.

Two modes

  • Review-time. Audit existing code, and produce prioritized findings. Each finding carries a severity, a location, a CWE and OWASP mapping, the confirmed source-to-sink path with the protection that failed, and a fix. The codebase stays read-only. Load references/01-audit-workflow.md before any topic file. It owns the sweep, and the topic files answer the questions the sweep generates. The report ends with what was not reviewed.
  • Write-time. Apply the standing secure-default contract while you generate code. Where a default conflicts with the request, apply the default and say so in one line. Close with a short security-decisions note rather than a findings report. The rule for each generation moment sits beside the control it completes, in the reference the router names.

Read the full file on GitHub · 86 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. 18d ago Changed · -3 tokens per session aed007ff787f
  2. 19d ago Changed · +7 tokens per session 3d15a6b9a1e4
  3. 1mo ago Changed · +5 lines · +63 tokens per session 15fd9f1c712f
  4. 1mo ago First seen · 81 lines · 996 tokens per session scan A 34528572ed41

Subscribe to this mod's changes

secure-code-auditor AGENTS.md is an instructions file published in the GitHub repository n-shadloo/secure-code-auditor (4 stars, last pushed 4d ago), licensed MIT. It adds 1,063 tokens to every session, about $0.0043 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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