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.
npx skills add Miosa-osa/OSA --skill offensive-request-smugglinggit clone --depth 1 https://github.com/Miosa-osa/OSAWrote 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.
[](https://agentmods.dev/skills/miosa-osa/osa/offensive-request-smuggling)<a href="https://agentmods.dev/skills/miosa-osa/osa/offensive-request-smuggling"><img src="https://agentmods.dev/badge/skills/miosa-osa/osa/offensive-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.
<a href="https://agentmods.dev/skills/miosa-osa/osa/offensive-request-smuggling"><img src="https://agentmods.dev/badge/skills/miosa-osa/osa/offensive-request-smuggling.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00061 | $0.05860 |
| Opus 5.5 | $0.00024 | $0.02344 |
| Sonnet 5.5 | $0.00012 | $0.01172 |
| Haiku 4.5 | $0.00006 | $0.00586 |
Grade A, and why
offensive-request-smuggling 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 1mo 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.
# Using curl with HTTP/3 This is a copy
94% identical to offensive-request-smuggling — 53 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 805 lines — stays where its author put it; the contents beside it link to each section on GitHub.
SKILL: HTTP Request Smuggling
Metadata
- Skill Name: request-smuggling
- Folder: offensive-request-smuggling
- Source: https://github.com/SnailSploit/offensive-checklist/blob/main/req-smuggle.md
Description
HTTP request smuggling checklist: CL.TE, TE.CL, TE.TE variants, detection with timing and differential responses, WAF bypass, cache poisoning, credential hijacking, and request smuggling via HTTP/2. Use when testing reverse proxy/load balancer configurations.
Trigger Phrases
Use this skill when the conversation involves any of:
request smuggling, HTTP smuggling, CL.TE, TE.CL, TE.TE, HTTP/2 smuggling, cache poisoning, WAF bypass, differential response, smuggling detection, proxy desync
Full Methodology
HTTP Request Smuggling
Mechanisms
HTTP Request Smuggling is a vulnerability that occurs when front-end and back-end servers interpret HTTP requests differently, leading to a desynchronization in the HTTP request processing chain. This desynchronization allows attackers to "smuggle" requests to the back-end server, potentially bypassing security controls or manipulating how other users' requests are processed.
graph TD
A[Client] -->|HTTP Request| B[Front-end Server]
B -->|Interpreted Request| C[Back-end Server]
B -->|Different Interpretation| D[Desynchronization]
D -->|Smuggled Request| C
D -->|Security Bypass| E[Unauthorized Access]
D -->|Queue Poisoning| F[Response Hijacking]
Request smuggling vulnerabilities arise from inconsistencies in how servers parse and interpret HTTP messages, particularly regarding:
- Transfer-Encoding (TE) header: Indicates chunked encoding
- Content-Length (CL) header: Specifies the length of the message body
- Header parsing: Different handling of whitespace, newlines, and malformed headers
Common desynchronization scenarios include:
- CL.TE: Front-end uses Content-Length, back-end uses Transfer-Encoding
- TE.CL: Front-end uses Transfer-Encoding, back-end uses Content-Length
- TE.TE: Both servers use Transfer-Encoding but handle edge cases differently
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.
- 1mo ago First seen · 805 lines · 61 tokens per session scan A b0d94d967ed0
offensive-request-smuggling is a skill published in the GitHub repository Miosa-osa/OSA (78 stars, last pushed 11d ago), licensed Apache-2.0. It adds 61 tokens to every session and 5,860 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). It is 94% identical to offensive-request-smuggling, differing in 53 lines, and is treated as a copy.
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