idor-testing

A guide for testing broken access control through direct references to records or files. This checks whether changing an identifier lets one user access another user’s data.

In plain words
What is it for?
Use it to test access to accounts, records, files, or other objects by changing their identifiers.
Why use it?
It helps uncover cases where the application checks that a request is valid but fails to check whether the requester is allowed to access that specific object.

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/neothecapt/redteamagent/idor-testing
Any agent
npx skills add NeoTheCapt/RedteamAgent --skill idor-testing
Clone the repo
git clone --depth 1 https://github.com/NeoTheCapt/RedteamAgent

Made for: Claude Code, Codex.

Per session 13 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 801 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. Scan, not verified.
Origin unknown 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 $0.00013 $0.00801
Opus 5 $0.00006 $0.00400
Sonnet 5 $0.00003 $0.00160
Haiku 4.5 $0.00001 $0.00080

Measured 3d ago against content hash 03ce06145cfa, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

idor-testing scanned grade A with 1 finding 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

- run_tool curl with multiple auth tokens
agent/skills/idor-testing/SKILL.md · 88 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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 · 88 lines · 13 tokens per session scan A 03ce06145cfa

Subscribe to this mod's changes

idor-testing is a skill published in the GitHub repository NeoTheCapt/RedteamAgent (122 stars, last pushed 1mo ago), with no licence file. It adds 13 tokens to every session and 801 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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