sast-missingauth

A code security checker for finding endpoints that lack login checks or do not properly restrict actions by user role. It maps the application's endpoints and permissions, checks groups of endpoints, and combines the findings.

In plain words
What is it for?
Reviewing authentication and function-level access control across a codebase.
Why use it?
It helps identify places where unauthorised users might access functions or data.

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/capture0x/yeepforge/sast-missingauth
Any agent
npx skills add capture0x/YeepForge --skill sast-missingauth
Clone the repo
git clone --depth 1 https://github.com/capture0x/YeepForge

Made for: Claude Code, Codex.

Per session 121 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 5,805 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 $0.00121 $0.05805
Opus 5 $0.00060 $0.02903
Sonnet 5 $0.00024 $0.01161
Haiku 4.5 $0.00012 $0.00581

Measured 2d ago against content hash eea27e1d521f, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

sast-missingauth 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 2d 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.

> [curl command or step-by-step to confirm on the live app.
modules/sast_skills/sast-missingauth/SKILL.md · 580 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. 2d ago First seen · 580 lines · 121 tokens per session scan A eea27e1d521f

Subscribe to this mod's changes

sast-missingauth is a skill published in the GitHub repository capture0x/YeepForge (1 stars, last pushed 8d ago), with no licence file. It adds 121 tokens to every session and 5,805 once invoked, about $0.0006 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 2026-08-31.

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