agentmods.dev

authentication

authentication is a skill for Claude Code, Codex from transilienceai/communitytools. It costs 32 tokens per session (553 once invoked), scanned A, original, MIT.

A security testing guide for login systems, access tokens, OAuth, passwords, two-factor authentication, CAPTCHA, and bot detection. JWT is a common token format, while OAuth lets one service grant another limited access.

In plain words
What is it for?
Use it to test authentication flows, token handling, password defenses, 2FA, CAPTCHA validation, and bot-detection controls.
Why use it?
It helps find weaknesses that could let attackers bypass login checks, forge tokens, reuse codes, or gain access without proper verification.

Skill for Claude CodeCodex

Part of the communitytools plugin — 42 skills, 5 commands, 9 agents, 1 hook shipped together

not rated 507 +4 1mo ago A scan 32 tokens original MIT
View the source file transilienceai/communitytools
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/transilienceai/communitytools/authentication
Any agent
npx skills add transilienceai/communitytools --skill authentication
Clone the repo
git clone --depth 1 https://github.com/transilienceai/communitytools

Made for: Claude Code, Codex.

Or install communitytools, the plugin that ships this one along with the rest of its 42 skills, 5 commands, 9 agents, 1 hook.

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 authentication

README.md
[![agentmods](https://agentmods.dev/badge/skills/transilienceai/communitytools/authentication.svg)](https://agentmods.dev/skills/transilienceai/communitytools/authentication)
Your own site
<a href="https://agentmods.dev/skills/transilienceai/communitytools/authentication"><img src="https://agentmods.dev/badge/skills/transilienceai/communitytools/authentication.svg" alt="Measured on agentmods" height="20"></a>
Per session 32 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 553 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 $0.00032 $0.00553
Opus 5 $0.00016 $0.00277
Sonnet 5 $0.00006 $0.00111
Haiku 4.5 $0.00003 $0.00055

Measured 4d ago against content hash cdfe6c0a78c6, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

authentication 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 4d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (reference/ntlm-http-listener.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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/authentication/SKILL.md · 57 lines

How it starts

The opening of the file, as written. The whole thing — 57 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Authentication

Test authentication mechanisms including login security, token handling, 2FA, CAPTCHA, and bot detection.

Techniques

Type Key Vectors
Auth Bypass Default credentials, logic flaws, response manipulation
ADFS/SAML Golden SAML, token signing cert theft, assertion manipulation, SAML wrapping
JWT Algorithm confusion, key injection, claim tampering, token forging
OAuth Redirect manipulation, CSRF, token leakage, scope abuse
Password Brute force, credential stuffing, password policy bypass
2FA Bypass Response manipulation, direct endpoint access, code reuse, race conditions
CAPTCHA Bypass Missing server validation, token reuse, OCR, parameter manipulation
Bot Detection Behavioral biometrics simulation, fingerprint randomization, stealth mode

Tools

PasswordGenerator (tools/password_generator.py):

from tools.password_generator import generate_password
password = generate_password(hint_text="8-16 chars, uppercase, numbers")

CredentialManager (tools/credential_manager.py):

from tools.credential_manager import CredentialManager
mgr = CredentialManager()
mgr.store_credential(target="example.com", username="test", password="pass")

Workflow

  1. Analyze auth implementation (forms, tokens, 2FA, CAPTCHA)
  2. Test bypass vectors per technique type
  3. Use Playwright MCP with human-like behavior (typing 80-200ms, random pauses)
  4. Capture evidence (screenshots, network logs, tokens)
  5. Document findings with PoC scripts

Reference

  • reference/authentication*.md - Auth bypass techniques, payloads, and resources
  • reference/jwt*.md - JWT attack techniques and cheat sheets
  • reference/oauth*.md - OAuth vulnerability testing
  • reference/scenarios/password-attacks/*.md - Password attack vectors (spray, stuffing, cracking, PtH)
  • reference/adfs-exploitation.md - ADFS, Golden SAML, federation attacks
  • reference/scenarios/2fa/*.md - 2FA bypass methods
  • reference/CAPTCHA_BYPASS.md - 11 CAPTCHA bypass techniques
  • reference/BOT_DETECTION.md - Bot detection evasion strategies
  • reference/PASSWORD_CREDENTIAL_MANAGEMENT.md - Tool usage guide

Read the full file on GitHub · 57 lines

Files

What ships with it

60 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. 4d ago First seen · 57 lines · 32 tokens per session scan A cdfe6c0a78c6

Subscribe to this mod's changes

authentication is a skill published in the GitHub repository transilienceai/communitytools (507 stars, last pushed 1mo ago), licensed MIT. It adds 32 tokens to every session and 553 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 2026-08-30.

SecurityTestingbounty-huntershackeronepentestpentest-toolsecurity-research
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