Input Arithmetic Safety
quillai-network/quillshield_skills
Detects input validation failures and arithmetic vulnerabilities in smart contracts.
File upload vulnerability testing — webshells, bypass, path traversal
Install File Upload Testing
$ npx skills add NeoTheCapt/RedteamAgent --skill file-upload-testing -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install NeoTheCapt/RedteamAgent file-upload-testing --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/NeoTheCapt/RedteamAgent.git skills-src && mkdir -p .claude/skills && cp -r skills-src/agent/skills/file-upload-testing .claude/skills/file-upload-testing && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "file-upload-testing" agent skill from https://github.com/NeoTheCapt/RedteamAgent/tree/master/agent/skills/file-upload-testing into .claude/skills/file-upload-testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "file-upload-testing", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/NeoTheCapt/RedteamAgent/tree/master/agent/skills/file-upload-testingType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add NeoTheCapt/RedteamAgent --skill file-upload-testing -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install NeoTheCapt/RedteamAgent file-upload-testing --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/NeoTheCapt/RedteamAgent.git skills-src && mkdir -p .agents/skills && cp -r skills-src/agent/skills/file-upload-testing .agents/skills/file-upload-testing && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "file-upload-testing" agent skill from https://github.com/NeoTheCapt/RedteamAgent/tree/master/agent/skills/file-upload-testing into .agents/skills/file-upload-testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "file-upload-testing", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add NeoTheCapt/RedteamAgent --skill file-upload-testing -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install NeoTheCapt/RedteamAgent file-upload-testing --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/NeoTheCapt/RedteamAgent.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/agent/skills/file-upload-testing .cursor/skills/file-upload-testing && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "file-upload-testing" agent skill from https://github.com/NeoTheCapt/RedteamAgent/tree/master/agent/skills/file-upload-testing into .cursor/skills/file-upload-testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "file-upload-testing", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/NeoTheCapt/RedteamAgent.git --path agent/skills/file-upload-testing--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add NeoTheCapt/RedteamAgent --skill file-upload-testing -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install NeoTheCapt/RedteamAgent file-upload-testing --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/NeoTheCapt/RedteamAgent.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/agent/skills/file-upload-testing .gemini/skills/file-upload-testing && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "file-upload-testing" agent skill from https://github.com/NeoTheCapt/RedteamAgent/tree/master/agent/skills/file-upload-testing into .gemini/skills/file-upload-testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "file-upload-testing", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install NeoTheCapt/RedteamAgent file-upload-testingInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add NeoTheCapt/RedteamAgent --skill file-upload-testing -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/NeoTheCapt/RedteamAgent.git skills-src && mkdir -p .github/skills && cp -r skills-src/agent/skills/file-upload-testing .github/skills/file-upload-testing && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "file-upload-testing" agent skill from https://github.com/NeoTheCapt/RedteamAgent/tree/master/agent/skills/file-upload-testing into .github/skills/file-upload-testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "file-upload-testing", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add NeoTheCapt/RedteamAgent --skill file-upload-testing -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install NeoTheCapt/RedteamAgent file-upload-testing --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/NeoTheCapt/RedteamAgent.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/agent/skills/file-upload-testing .opencode/skills/file-upload-testing && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "file-upload-testing" agent skill from https://github.com/NeoTheCapt/RedteamAgent/tree/master/agent/skills/file-upload-testing into .opencode/skills/file-upload-testing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "file-upload-testing", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
file-upload-testing- GitHub stars
- 142
- Token cost
- ~1.6k tokens
- SKILL.md length
- 743 words
- Files
- 1
- Skills in repo
- 25
- Repo updated
- First seen
- Licence
- None found
At a glance
File upload vulnerability testing — webshells, bypass, path traversal
- Works in 8 steps: Understand Upload Mechanism → Extension Bypass → Content-Type Bypass → …
- Tasks that involve File uploads and storage
- SKILL.md covers When to Activate, Tools, Methodology and What to Record
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
File Upload Testing is an agent skill from NeoTheCapt/RedteamAgent. File upload vulnerability testing — webshells, bypass, path traversal
Its SKILL.md is about 1.6k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Backend & APIs, covering File uploads and storage and Penetration testing. The repository describes itself as: An AI red-team agent for authorized labs and web app pentesting workflows. Turns Claude Code / OpenCode / Codex into a structured recon → test → exploit → report workflow, with…
When your agent uses it
- Tasks that involve File uploads and storage
- Tasks that involve Penetration testing
Example prompts
- “/file-upload-testing”
Workflow steps
8 steps, taken from the step headings in SKILL.md.
- Understand Upload Mechanism
- Extension Bypass
- Content-Type Bypass
- Magic Bytes / Content Bypass
- Webshell Payloads
- Path Traversal in Filename
- Special File Attacks
- Size and Resource Limits
What it can do on your machine
Read from SKILL.md and the folder at commit 2e60476. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
File Upload Testing loads about 1.6k tokens when it runs. Until then it costs about 22 tokens; SKILL.md has 743 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
Without a licence we can't republish the file, so here is its outline and opening line. It has 743 words (~1,566 tokens).
“payload, run one bounded Upload Type confirmation before closing the upload case: submit a non-PDF/non-ZIP payload such as a tiny .txt, .xml, or .svg with the same authenticated context, preserve the status/body evidence, then visit the consumer or scoreboard route…”
- name
- file-upload-testing
- origin
- RedteamOpencode
Files
Just SKILL.md in agent/skills/file-upload-testing of NeoTheCapt/RedteamAgent.
Open the folder on GitHubat commit 2e60476
Compare with similar skills
File Upload Testing next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| File Upload Testing this skillNeoTheCapt/RedteamAgent | 142 | — | ~1.6k | Automated safety check: Pass | None | |
| Input Arithmetic Safetyquillai-network/quillshield_skills | 129 | — | ~3.1k | Automated safety check: Pass | MIT | |
| TakeoverPentesterFlow/agent | 1.4k | — | ~3.3k | Automated safety check: Pass | Apache-2.0 | |
| API Coverage Checkforefy/reburp | 117 | — | ~213 | Automated safety check: Pass | MIT | |
| Openfdd Mt Securitybbartling/open-fdd | 172 | — | ~2.2k | Automated safety check: Pass | Custom licence | |
| Remediating S3 Bucket Misconfigurationmukul975/Anthropic-Cybersecurity-Skills | 34k | — | ~3k | Automated safety check: Pass | Apache-2.0 |
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PentesterFlow/agent
Subdomain takeover playbook — sweep subdomains for dangling CNAMEs / NS records pointing at unclaimed third-party resources (GitHub Pages, S3, Heroku, Azure, Netlify, Shopify, ...), confirm with the…
API Coverage Check
forefy/reburp
Check reburp's Montoya API coverage and detect when a Burp/Montoya upgrade added or changed APIs.
Openfdd Mt Security
bbartling/open-fdd
Multi-tenant authz, pre-auth disclosure hardening, and Kali disposition.
Remediating S3 Bucket Misconfiguration
mukul975/Anthropic-Cybersecurity-Skills
Provides step-by-step procedures for remediating Amazon S3 bucket misconfigurations that expose sensitive data: enabling S3 Block Public Access, auditing bucket policies and ACLs, enforcing…
Hunt File Upload
sickn33/agentic-awesome-skills
Hunt file upload bugs
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Related
Categories
Questions about File Upload Testing
What does File Upload Testing do?
File upload vulnerability testing — webshells, bypass, path traversal. File Upload Testing is an agent skill from NeoTheCapt/RedteamAgent.
When should I use File Upload Testing?
File Upload Testing fits situations like: tasks that involve File uploads and storage; tasks that involve Penetration testing.
How do I install File Upload Testing in Claude Code?
Run `npx skills add NeoTheCapt/RedteamAgent --skill file-upload-testing -a claude-code`. Or copy the skill folder (agent/skills/file-upload-testing in NeoTheCapt/RedteamAgent) into .claude/skills/file-upload-testing in your project. Claude Code loads it when a task matches its description.
How do I install File Upload Testing in Codex?
Run `npx skills add NeoTheCapt/RedteamAgent --skill file-upload-testing -a codex`. Or copy the skill folder (agent/skills/file-upload-testing in NeoTheCapt/RedteamAgent) into .agents/skills/file-upload-testing in your project. Codex loads it when a task matches its description.
Can I use File Upload Testing in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add NeoTheCapt/RedteamAgent --skill file-upload-testing -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/file-upload-testing, .gemini/skills/file-upload-testing, .github/skills/file-upload-testing and .opencode/skills/file-upload-testing in your project.
What does File Upload Testing need to run?
SKILL.md names no scripts, command-line tools or credentials: File Upload Testing is instructions for the agent only.
Does File Upload Testing access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is File Upload Testing safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does File Upload Testing use?
No licence was found for File Upload Testing or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does File Upload Testing use?
About 1.6k tokens (SKILL.md is roughly 6.3k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to File Upload Testing?
Skills that share tags, products or a category with File Upload Testing: Input Arithmetic Safety (quillai-network/quillshield_skills, 129 stars), Takeover (PentesterFlow/agent, 1.4k stars), API Coverage Check (forefy/reburp, 117 stars) and Openfdd Mt Security (bbartling/open-fdd, 172 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains File Upload Testing?
NeoTheCapt (a GitHub user) maintains it in NeoTheCapt/RedteamAgent, which has 142 GitHub stars. The repository holds 25 skills in this directory. The repository was last updated on August 2, 2026.
Source: NeoTheCapt/RedteamAgent on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.