claude-red is a library of structured skills that give Claude specialized offensive-security methods for areas such as web vulnerabilities, shellcode, exploit development, and identity systems. It is intended for authorized red-team work, bug-bounty triage, security research, CTF preparation, and operator training. Its catalogue contains the project's skills for loading these security specializations into Claude.
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 agentmods add skills/snailsploit/claude-red/offensive-request-smugglingnpx skills add SnailSploit/Claude-Red --skill offensive-request-smugglinggit clone --depth 1 https://github.com/SnailSploit/Claude-RedWrote 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/snailsploit/claude-red/offensive-request-smuggling)<a href="https://agentmods.dev/skills/snailsploit/claude-red/offensive-request-smuggling"><img src="https://agentmods.dev/badge/skills/snailsploit/claude-red/offensive-request-smuggling.svg" alt="Measured on agentmods" 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 | $0.00000 | $0.05564 |
| Opus 5 | $0.00000 | $0.02782 |
| Sonnet 5 | $0.00000 | $0.01113 |
| Haiku 4.5 | $0.00000 | $0.00556 |
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 6d 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 How it starts
The opening of the file, as written. The whole thing — 772 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
Instructions for Claude
When this skill is active:
- Load and apply the full methodology below as your operational checklist
- Follow steps in order unless the user specifies otherwise
- For each technique, consider applicability to the current target/context
- Track which checklist items have been completed
- Suggest next steps based on findings
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
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.
- 6d ago First seen · 772 lines · 0 tokens per session scan A 67c54307ca87
offensive-request-smuggling is a skill published in the GitHub repository SnailSploit/Claude-Red (3,026 stars, last pushed 6d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 5,564 tokens. 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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