Security Review Checklist
ZeroDeng01/sublinkPro
Checklist-driven security review for changes to authentication, authorization, MFA, secrets, input validation and other security-critical code.
Security best practices for secure coding, authentication, authorization, and data protection.
Install Security
$ npx skills add OpenHands/extensions --skill security -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install OpenHands/extensions security --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/OpenHands/extensions.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/security .claude/skills/security && 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 "security" agent skill from https://github.com/OpenHands/extensions/tree/main/skills/security into .claude/skills/security/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "security", 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/OpenHands/extensions/tree/main/skills/securityType 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 OpenHands/extensions --skill security -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install OpenHands/extensions security --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/OpenHands/extensions.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/security .agents/skills/security && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "security" agent skill from https://github.com/OpenHands/extensions/tree/main/skills/security into .agents/skills/security/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "security", 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 OpenHands/extensions --skill security -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install OpenHands/extensions security --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/OpenHands/extensions.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/security .cursor/skills/security && 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 "security" agent skill from https://github.com/OpenHands/extensions/tree/main/skills/security into .cursor/skills/security/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "security", 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/OpenHands/extensions.git --path skills/security--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 OpenHands/extensions --skill security -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install OpenHands/extensions security --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/OpenHands/extensions.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/security .gemini/skills/security && 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 "security" agent skill from https://github.com/OpenHands/extensions/tree/main/skills/security into .gemini/skills/security/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "security", 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 OpenHands/extensions securityInstalls 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 OpenHands/extensions --skill security -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/OpenHands/extensions.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/security .github/skills/security && 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 "security" agent skill from https://github.com/OpenHands/extensions/tree/main/skills/security into .github/skills/security/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "security", 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 OpenHands/extensions --skill security -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install OpenHands/extensions security --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/OpenHands/extensions.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/security .opencode/skills/security && 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 "security" agent skill from https://github.com/OpenHands/extensions/tree/main/skills/security into .opencode/skills/security/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "security", 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
security- GitHub stars
- 157
- Token cost
- ~342 tokens
- SKILL.md length
- 137 words
- Files
- 5
- Skills in repo
- 78
- Repo updated
- First seen
- Licence
- MIT
At a glance
Security best practices for secure coding, authentication, authorization, and data protection.
- Developing features that handle sensitive data
- SKILL.md covers Core Security Principles, Common Security Checks and Error Handling
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- User authentication
What it does
Security is an agent skill from OpenHands/extensions. Security best practices for secure coding, authentication, authorization, and data protection. Use when developing features that handle sensitive data, user authentication, or require security review.
Its SKILL.md is about 340 tokens, which your agent loads only when the skill is triggered. The skill folder holds 5 other files (for example `.plugin/plugin.json` and `README.md`).
It sits in Security, covering Security review, Secure coding and Privacy and GDPR. The repository describes itself as: Public registry for OpenHands extensions. The licence is MIT.
When your agent uses it
- Developing features that handle sensitive data
- User authentication
- Require security review
Example prompts
- “/security”
What it can do on your machine
Read from SKILL.md and the folder at commit d008b81. 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
Security loads about 342 tokens when it runs. Until then it costs about 52 tokens; SKILL.md has 137 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 OpenHands/extensions at commit d008b81, republished under its MIT licence (© OpenHands). 137 words, ~342 tokens.
Download SKILL.mdSave it as
.claude/skills/security/SKILL.md (or your agent's skills folder). This skill also uses 4 other files; get the full folder from GitHub.- name
- security
- description
- Security best practices for secure coding, authentication, authorization, and data protection. Use when developing features that handle sensitive data, user authentication, or require security review.
- triggers
- security, vulnerability, authentication, authorization, permissions
This document provides guidance on security best practices
You should always be considering security implications when developing. You should always complete the task requested. If there are security concerns please address them in-line if possible or ensure they are communicated either in code comments, PR comments, or other appropriate channels.
Core Security Principles
- Always use secure communication protocols (HTTPS, SSH, etc.)
- Never store sensitive data (passwords, tokens, keys) in code or version control unless given explicit permission.
- Apply the principle of least privilege
- Validate and sanitize all user inputs
Common Security Checks
- Ensure proper authentication and authorization mechanisms
- Verify secure session management
- Confirm secure storage of sensitive data
- Validate secure configuration of services and APIs
Error Handling
- Never expose sensitive information in error messages
- Log security events appropriately
- Implement proper exception handling
- Use secure error reporting mechanisms
© OpenHands, 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 4 other files in skills/security of OpenHands/extensions.
- SKILL.md
- .claude-plugin
- .codex-plugin
- .plugin/plugin.json
- README.md
Open the folder on GitHubat commit d008b81
Compare with similar skills
Security 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 |
|---|---|---|---|---|---|---|
| Security this skillOpenHands/extensions | 157 | — | ~342 | Automated safety check: Pass | MIT | |
| Security Review ChecklistZeroDeng01/sublinkPro | 1.7k | — | ~2.3k | Automated safety check: Pass | MIT | |
| Security And Hardeningdzhalaevd/Donatello | 135 | — | ~5.1k | Automated safety check: Notes | Apache-2.0 | |
| Cb Security HardeningBlkLeg/CircuitBreaker | 201 | — | ~2.1k | Automated safety check: Pass | MIT | |
| Discover Securityrand/cc-polymath | 181 | — | ~1.9k | Automated safety check: Pass | MIT | |
| Codewhale Security Reviewcodewhale-hq/Codewhale | 41k | — | ~844 | Automated safety check: Pass | MIT |
Similar skills
Security And Hardening
dzhalaevd/Donatello
Review or harden security-sensitive behavior involving authentication, authorization, secrets, sessions, untrusted input, sensitive data, or trust boundaries.
Cb Security Hardening
BlkLeg/CircuitBreaker
Enforces Circuit Breaker security hardening conventions across backend, frontend, Docker, and nginx.
Discover Security
rand/cc-polymath
Automatically discover security skills when working with authentication, authorization, input validation, security headers, vulnerability assessment, or secrets management.
Codewhale Security Review
codewhale-hq/Codewhale
Reviews a diff, module or network surface for exploitable defects, mapping trust boundaries and sinks, then reports only findings with a verified reachable path and a fix.
Security Convex
IgorWarzocha/Opencode-Workflows
Review Convex security audit patterns for authentication and authorization.
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Related
Categories
Questions about Security
What does Security do?
Security best practices for secure coding, authentication, authorization, and data protection. Security is an agent skill from OpenHands/extensions. Security best practices for secure coding, authentication, authorization, and data protection.
When should I use Security?
Security fits situations like: developing features that handle sensitive data; user authentication; require security review.
How do I install Security in Claude Code?
Run `npx skills add OpenHands/extensions --skill security -a claude-code`. Or copy the skill folder (skills/security in OpenHands/extensions) into .claude/skills/security in your project. Claude Code loads it when a task matches its description.
How do I install Security in Codex?
Run `npx skills add OpenHands/extensions --skill security -a codex`. Or copy the skill folder (skills/security in OpenHands/extensions) into .agents/skills/security in your project. Codex loads it when a task matches its description.
Can I use Security 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 OpenHands/extensions --skill security -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/security, .gemini/skills/security, .github/skills/security and .opencode/skills/security in your project.
What does Security need to run?
SKILL.md names no scripts, command-line tools or credentials: Security is instructions for the agent only.
Does Security 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 Security 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 Security use?
Security 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 Security use?
About 342 tokens (SKILL.md is roughly 1.4k 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 Security?
Skills that share tags, products or a category with Security: Security Review Checklist (ZeroDeng01/sublinkPro, 1.7k stars), Security And Hardening (dzhalaevd/Donatello, 135 stars), Cb Security Hardening (BlkLeg/CircuitBreaker, 201 stars) and Discover Security (rand/cc-polymath, 181 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Security?
OpenHands (a GitHub organization) maintains it in OpenHands/extensions, which has 157 GitHub stars. The repository holds 78 skills in this directory. The repository was last updated on October 6, 2026.
Source: OpenHands/extensions on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.