request-smuggling

request-smuggling is a skill for Claude Code, Codex from ok-helloworld/vibe-pentest. It costs 62 tokens per session (3,178 once invoked), scanned B, original, AGPL-3.0.

A guide for testing HTTP request smuggling, where front-end servers and application servers interpret one web request differently.

In plain words
What is it for?
It helps test Content-Length and Transfer-Encoding differences, HTTP/2-to-HTTP/1 conversion, and browser-based request desynchronisation.
Why use it?
It helps find security problems caused by disagreements between proxies, content delivery networks, load balancers, and the main application about request boundaries.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing.

Good fit It helps test Content-Length and Transfer-Encoding differences, HTTP/2-to-HTTP/1 conversion, and browser-based request desynchronisation.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/ok-helloworld/vibe-pentest/request-smuggling
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 ok-helloworld/vibe-pentest --skill request-smuggling
Clone the repo
git clone --depth 1 https://github.com/ok-helloworld/vibe-pentest

Made for: Claude Code, 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 request-smuggling

README.md
[![agentmods](https://agentmods.dev/badge/skills/ok-helloworld/vibe-pentest/request-smuggling/github.svg)](https://agentmods.dev/skills/ok-helloworld/vibe-pentest/request-smuggling)
Your own site
<a href="https://agentmods.dev/skills/ok-helloworld/vibe-pentest/request-smuggling"><img src="https://agentmods.dev/badge/skills/ok-helloworld/vibe-pentest/request-smuggling/github.svg" alt="Measured on agentmods" height="20"></a>

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.

agentmods 80×15 button for request-smuggling

Your own site · 80×15
<a href="https://agentmods.dev/skills/ok-helloworld/vibe-pentest/request-smuggling"><img src="https://agentmods.dev/badge/skills/ok-helloworld/vibe-pentest/request-smuggling.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 62 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,178 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00062 $0.03178
Opus 5 $0.00031 $0.01589
Sonnet 5 $0.00012 $0.00636
Haiku 4.5 $0.00006 $0.00318

Measured 9d ago against content hash 6469b8e00d95, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade B, and why

request-smuggling scanned grade B 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 9d 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.

Sends data to an external URLmediumData exfiltration

A POST to an outside endpoint may be telemetry or may be exfiltration; either way the mod talks to somewhere, and you should know where.

fetch("https://target.example/vulnerable", { method: "POST",
references/pentest_skills/request-smuggling/SKILL.md · 315 lines

The source is not reproduced here

Licensed AGPL-3.0

The repository is licensed AGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

Files

What ships with it

1 file 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. 9d ago First seen · 315 lines · 62 tokens per session scan B 6469b8e00d95

Subscribe to this mod's changes

request-smuggling is a skill published in the GitHub repository ok-helloworld/vibe-pentest (307 stars, last pushed today), licensed AGPL-3.0. It adds 62 tokens to every session and 3,178 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it B with 1 finding (sends data to an external url). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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