Security And Hardening
penpot/penpot
Hardens code against vulnerabilities. An agent skill from penpot/penpot.
Client-side vulnerability testing - XSS (reflected/stored/DOM), CSRF, CORS misconfiguration, Clickjacking, DOM-based attacks, and Prototype Pollution.
Install Client Side
$ npx skills add transilienceai/communitytools --skill client-side -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install transilienceai/communitytools client-side --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/transilienceai/communitytools.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/client-side .claude/skills/client-side && 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 "client-side" agent skill from https://github.com/transilienceai/communitytools/tree/main/skills/client-side into .claude/skills/client-side/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "client-side", 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/transilienceai/communitytools/tree/main/skills/client-sideType 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 transilienceai/communitytools --skill client-side -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install transilienceai/communitytools client-side --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/transilienceai/communitytools.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/client-side .agents/skills/client-side && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "client-side" agent skill from https://github.com/transilienceai/communitytools/tree/main/skills/client-side into .agents/skills/client-side/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "client-side", 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 transilienceai/communitytools --skill client-side -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install transilienceai/communitytools client-side --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/transilienceai/communitytools.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/client-side .cursor/skills/client-side && 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 "client-side" agent skill from https://github.com/transilienceai/communitytools/tree/main/skills/client-side into .cursor/skills/client-side/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "client-side", 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/transilienceai/communitytools.git --path skills/client-side--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 transilienceai/communitytools --skill client-side -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install transilienceai/communitytools client-side --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/transilienceai/communitytools.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/client-side .gemini/skills/client-side && 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 "client-side" agent skill from https://github.com/transilienceai/communitytools/tree/main/skills/client-side into .gemini/skills/client-side/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "client-side", 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 transilienceai/communitytools client-sideInstalls 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 transilienceai/communitytools --skill client-side -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/transilienceai/communitytools.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/client-side .github/skills/client-side && 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 "client-side" agent skill from https://github.com/transilienceai/communitytools/tree/main/skills/client-side into .github/skills/client-side/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "client-side", 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 transilienceai/communitytools --skill client-side -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install transilienceai/communitytools client-side --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/transilienceai/communitytools.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/client-side .opencode/skills/client-side && 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 "client-side" agent skill from https://github.com/transilienceai/communitytools/tree/main/skills/client-side into .opencode/skills/client-side/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "client-side", 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
client-side- GitHub stars
- 562
- Token cost
- ~374 tokens
- SKILL.md length
- 127 words
- Files
- 47
- Skills in repo
- 35
- Repo updated
- First seen
- Licence
- MIT
At a glance
Client-side vulnerability testing - XSS (reflected/stored/DOM), CSRF, CORS misconfiguration, Clickjacking, DOM-based attacks, and Prototype Pollution.
- Works in 6 steps: Identify input sources and data flows → Classify sink contexts (HTML, attribute,… → Enumerate defenses (encoding, CSP,… → …
- Tasks that involve Web application vulnerabilities
- SKILL.md covers Techniques, Workflow and Reference
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Client Side is an agent skill from transilienceai/communitytools. Client-side vulnerability testing - XSS (reflected/stored/DOM), CSRF, CORS misconfiguration, Clickjacking, DOM-based attacks, and Prototype Pollution.
Its SKILL.md is about 370 tokens, which your agent loads only when the skill is triggered. The skill folder holds 49 other files (for example `reference/INDEX.md`, `reference/clickjacking-cheat-sheet.md` and `reference/clickjacking-quickstart.md`).
It sits in Security, covering Web application vulnerabilities. The repository describes itself as: Open-source Claude Code skills, agents, and slash commands for AI-powered penetration testing, bug bounty hunting, and security research. The licence is MIT.
When your agent uses it
- Tasks that involve Web application vulnerabilities
Example prompts
- “/client-side”
Workflow steps
6 steps, taken from the first numbered list in SKILL.md.
- Identify input sources and data flows
- Classify sink contexts (HTML, attribute, URL, JS, CSS)
- Enumerate defenses (encoding, CSP, sanitizers, Trusted Types)
- Craft context-appropriate payloads
- Validate execution and demonstrate impact
- Document with reproduction steps and remediation
What it can do on your machine
Read from SKILL.md and the folder at commit 95fdc12. 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
Client Side loads about 374 tokens when it runs. Until then it costs about 41 tokens; SKILL.md has 127 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
The full file from transilienceai/communitytools at commit 95fdc12, republished under its MIT licence (© transilienceai). 127 words, ~374 tokens.
Download SKILL.mdSave it as
.claude/skills/client-side/SKILL.md (or your agent's skills folder). This skill also uses 46 other files; get the full folder from GitHub.- name
- client-side
- description
- Client-side vulnerability testing - XSS (reflected/stored/DOM), CSRF, CORS misconfiguration, Clickjacking, DOM-based attacks, and Prototype Pollution.
Client-Side
Test for client-side vulnerabilities across modern web applications and SPAs.
Techniques
| Type | Key Vectors |
|---|---|
| XSS | Reflected, Stored, DOM-based, framework-specific (React, Vue, Angular) |
| CSRF | Token bypass, SameSite cookie bypass, cross-origin requests |
| CORS | Misconfigured origins, null origin, wildcard credentials |
| Clickjacking | Frame-based, drag-and-drop, multi-step |
| DOM-based | DOM sinks, source/sink analysis, JavaScript URL schemes |
| Prototype Pollution | Client-side gadgets, server-side pollution, property injection |
Workflow
- Identify input sources and data flows
- Classify sink contexts (HTML, attribute, URL, JS, CSS)
- Enumerate defenses (encoding, CSP, sanitizers, Trusted Types)
- Craft context-appropriate payloads
- Validate execution and demonstrate impact
- Document with reproduction steps and remediation
Reference
reference/xss*.md- XSS bypass techniques and exploitationreference/csrf*.md- CSRF techniques and bypassesreference/cors*.md- CORS misconfiguration testingreference/clickjacking*.md- Clickjacking techniquesreference/dom*.md- DOM-based vulnerability testingreference/prototype-pollution*.md- Prototype pollution techniques
© transilienceai, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 46 other files in skills/client-side of transilienceai/communitytools.
- SKILL.md
- reference/INDEX.md
- reference/clickjacking-cheat-sheet.md
- reference/clickjacking-quickstart.md
- reference/client-side-principles.md
- reference/cors-cheat-sheet.md
- reference/cors-quickstart.md
- reference/csrf-quickstart.md
- reference/dom-xss-advanced.md
- reference/dom-xss-quickstart.md
- reference/prototype-pollution-quickstart.md
- reference/prototype-pollution-resources.md
- reference/scenarios/dom-vulnerabilities/angularjs-injection.md
- reference/scenarios/dom-vulnerabilities/detection-methodology.md
- reference/scenarios/dom-vulnerabilities/document-write-sink.md
- reference/scenarios/dom-vulnerabilities/dom-clobbering-globals.md
- reference/scenarios/dom-vulnerabilities/dom-clobbering-sanitizer-bypass.md
- reference/scenarios/dom-vulnerabilities/dom-xss-fundamentals.md
- … and 29 more
Open the folder on GitHubat commit 95fdc12
Compare with similar skills
Client Side 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 |
|---|---|---|---|---|---|---|
| Client Side this skilltransilienceai/communitytools | 562 | — | ~374 | Automated safety check: Pass | MIT | |
| Security And Hardeningpenpot/penpot | 61k | 6 repos | ~4.7k | Automated safety check: Notes | MPL-2.0 | |
| Security Auditoreigent-ai/eigent | 15k | — | ~1.8k | Automated safety check: Notes | Apache-2.0 | |
| Security Reviewjewbetcha/opentrace | 116 | 18 repos | ~3.1k | Automated safety check: Notes | MIT | |
| Strix Code Vulnerability Scanusestrix/strix | 67k | — | ~1.1k | Automated safety check: Pass | Apache-2.0 | |
| Code Audit3stoneBrother/code-audit | 893 | 1 repos | ~2.7k | Automated safety check: Pass | None |
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Related
Categories
Questions about Client Side
What does Client Side do?
Client-side vulnerability testing - XSS (reflected/stored/DOM), CSRF, CORS misconfiguration, Clickjacking, DOM-based attacks, and Prototype Pollution. Client Side is an agent skill from transilienceai/communitytools. Client-side vulnerability testing - XSS (reflected/stored/DOM), CSRF, CORS misconfiguration, Clickjacking, DOM-based attacks, and Prototype Pollution.
When should I use Client Side?
Client Side fits situations like: tasks that involve Web application vulnerabilities.
How do I install Client Side in Claude Code?
Run `npx skills add transilienceai/communitytools --skill client-side -a claude-code`. Or copy the skill folder (skills/client-side in transilienceai/communitytools) into .claude/skills/client-side in your project. Claude Code loads it when a task matches its description.
How do I install Client Side in Codex?
Run `npx skills add transilienceai/communitytools --skill client-side -a codex`. Or copy the skill folder (skills/client-side in transilienceai/communitytools) into .agents/skills/client-side in your project. Codex loads it when a task matches its description.
Can I use Client Side 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 transilienceai/communitytools --skill client-side -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/client-side, .gemini/skills/client-side, .github/skills/client-side and .opencode/skills/client-side in your project.
What does Client Side need to run?
SKILL.md names no scripts, command-line tools or credentials: Client Side is instructions for the agent only.
Does Client Side 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 Client Side 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 Client Side use?
Client Side is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Client Side use?
About 374 tokens (SKILL.md is roughly 1.5k 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 Client Side?
Skills that share tags, products or a category with Client Side: Security And Hardening (penpot/penpot, 61k stars), Security Auditor (eigent-ai/eigent, 15k stars), Security Review (jewbetcha/opentrace, 116 stars) and Strix Code Vulnerability Scan (usestrix/strix, 67k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Client Side?
transilienceai (a GitHub organization) maintains it in transilienceai/communitytools, which has 562 GitHub stars. The repository holds 35 skills in this directory. The repository was last updated on July 29, 2026.
Source: transilienceai/communitytools on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.