Deepsec Documentation Guide
vercel-labs/deepsec
Points the agent at deepsec's own docs to answer questions about initializing, configuring, resuming, scanning with and extending the vulnerability scanner.
Validate cors policy validator operations. An agent skill from jeremylongshore/tons-of-skills-marketplace.
Install Cors Policy Validator
$ npx skills add jeremylongshore/tons-of-skills-marketplace --skill cors-policy-validator -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install jeremylongshore/tons-of-skills-marketplace cors-policy-validator --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/jeremylongshore/tons-of-skills-marketplace.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/03-security-fundamentals/cors-policy-validator .claude/skills/cors-policy-validator && 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 "cors-policy-validator" agent skill from https://github.com/jeremylongshore/tons-of-skills-marketplace/tree/main/skills/03-security-fundamentals/cors-policy-validator into .claude/skills/cors-policy-validator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cors-policy-validator", 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/jeremylongshore/tons-of-skills-marketplace/tree/main/skills/03-security-fundamentals/cors-policy-validatorType 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 jeremylongshore/tons-of-skills-marketplace --skill cors-policy-validator -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install jeremylongshore/tons-of-skills-marketplace cors-policy-validator --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/jeremylongshore/tons-of-skills-marketplace.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/03-security-fundamentals/cors-policy-validator .agents/skills/cors-policy-validator && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "cors-policy-validator" agent skill from https://github.com/jeremylongshore/tons-of-skills-marketplace/tree/main/skills/03-security-fundamentals/cors-policy-validator into .agents/skills/cors-policy-validator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cors-policy-validator", 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 jeremylongshore/tons-of-skills-marketplace --skill cors-policy-validator -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install jeremylongshore/tons-of-skills-marketplace cors-policy-validator --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/jeremylongshore/tons-of-skills-marketplace.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/03-security-fundamentals/cors-policy-validator .cursor/skills/cors-policy-validator && 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 "cors-policy-validator" agent skill from https://github.com/jeremylongshore/tons-of-skills-marketplace/tree/main/skills/03-security-fundamentals/cors-policy-validator into .cursor/skills/cors-policy-validator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cors-policy-validator", 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/jeremylongshore/tons-of-skills-marketplace.git --path skills/03-security-fundamentals/cors-policy-validator--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 jeremylongshore/tons-of-skills-marketplace --skill cors-policy-validator -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install jeremylongshore/tons-of-skills-marketplace cors-policy-validator --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/jeremylongshore/tons-of-skills-marketplace.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/03-security-fundamentals/cors-policy-validator .gemini/skills/cors-policy-validator && 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 "cors-policy-validator" agent skill from https://github.com/jeremylongshore/tons-of-skills-marketplace/tree/main/skills/03-security-fundamentals/cors-policy-validator into .gemini/skills/cors-policy-validator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cors-policy-validator", 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 jeremylongshore/tons-of-skills-marketplace cors-policy-validatorInstalls 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 jeremylongshore/tons-of-skills-marketplace --skill cors-policy-validator -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/jeremylongshore/tons-of-skills-marketplace.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/03-security-fundamentals/cors-policy-validator .github/skills/cors-policy-validator && 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 "cors-policy-validator" agent skill from https://github.com/jeremylongshore/tons-of-skills-marketplace/tree/main/skills/03-security-fundamentals/cors-policy-validator into .github/skills/cors-policy-validator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cors-policy-validator", 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 jeremylongshore/tons-of-skills-marketplace --skill cors-policy-validator -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install jeremylongshore/tons-of-skills-marketplace cors-policy-validator --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/jeremylongshore/tons-of-skills-marketplace.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/03-security-fundamentals/cors-policy-validator .opencode/skills/cors-policy-validator && 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 "cors-policy-validator" agent skill from https://github.com/jeremylongshore/tons-of-skills-marketplace/tree/main/skills/03-security-fundamentals/cors-policy-validator into .opencode/skills/cors-policy-validator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cors-policy-validator", 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
cors-policy-validator- GitHub stars
- 2.8k
- Token cost
- ~583 tokens
- SKILL.md length
- 197 words
- Files
- 1
- Skills in repo
- 3,342
- Repo updated
- First seen
- Licence
- MIT
At a glance
Validate cors policy validator operations. An agent skill from jeremylongshore/tons-of-skills-marketplace.
- Works in 4 steps: Provides step-by-step guidance for cors… → Follows industry best practices and… → Generates production-ready code and… → …
- : cors policy validator
- SKILL.md covers Overview, When to Use, Instructions and Examples, plus 5 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Cors Policy Validator is an agent skill from jeremylongshore/tons-of-skills-marketplace. Validate cors policy validator operations. Auto-activating skill for Security Fundamentals. Triggers on: cors policy validator, cors policy validator Part of the Security Fundamentals skill category. Use when working with cors policy validator functionality. Trigger with phrases like "cors policy validator", "cors validator", "cors".
Its SKILL.md is about 580 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts. Compatibility notes: Designed for Claude Code
It sits in Security. The repository describes itself as: Model-agnostic agent-skills platform with a harness-free canonical layer, verified adapters, and the ccpi package manager. Explore at tonsofskills.com. The licence is MIT.
When your agent uses it
- : cors policy validator
- Cors policy validator Part of the Security Fundamentals skill category
- Working with cors policy validator functionality
- With phrases like cors policy validator
Example prompts
- “cors policy validator”
- “cors validator”
- “/cors-policy-validator”
Requirements
- Compatibility (from SKILL.md): Designed for Claude Code
- Pre-approved tools (allowed-tools): Read, Write, Grep, Bash(npm:*)
Workflow steps
4 steps, taken from the first numbered list in SKILL.md.
- Provides step-by-step guidance for cors policy validator
- Follows industry best practices and patterns
- Generates production-ready code and configurations
- Validates outputs against common standards
What it can do on your machine
Read from SKILL.md and the folder at commit cfae287. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves these tools, so the agent can use them without asking each time:
ReadWriteGrepBash(npm:*)
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.
Compatibility
Designed for Claude Code
From compatibility in the SKILL.md frontmatter.
Context cost
Cors Policy Validator loads about 583 tokens when it runs. Until then it costs about 89 tokens; SKILL.md has 197 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 jeremylongshore/tons-of-skills-marketplace at commit cfae287, republished under its MIT licence (© jeremylongshore). 197 words, ~583 tokens.
Download SKILL.mdSave it as
.claude/skills/cors-policy-validator/SKILL.md (or your agent's skills folder).- name
- cors-policy-validator
- description
- Validate cors policy validator operations. Auto-activating skill for Security Fundamentals. Triggers on: cors policy validator, cors policy validator Part of the Security Fundamentals skill category. Use when working with cors policy validator functionality. Trigger with phrases like "cors policy validator", "cors validator", "cors".
- allowed-tools
- Read, Write, Grep, Bash(npm:*)
- compatibility
- Designed for Claude Code
- version
- 1.0.0
- license
- MIT
- author
- Jeremy Longshore <jeremy@intentsolutions.io>
- tags
- security, compliance
Cors Policy Validator
Overview
This skill provides automated assistance for cors policy validator tasks within the Security Fundamentals domain.
When to Use
This skill activates automatically when you:
- Mention "cors policy validator" in your request
- Ask about cors policy validator patterns or best practices
- Need help with essential security skills covering authentication, input validation, secure coding practices, and basic vulnerability detection.
Instructions
- Provides step-by-step guidance for cors policy validator
- Follows industry best practices and patterns
- Generates production-ready code and configurations
- Validates outputs against common standards
Examples
Example: Basic Usage Request: "Help me with cors policy validator" Result: Provides step-by-step guidance and generates appropriate configurations
Prerequisites
- Relevant development environment configured
- Access to necessary tools and services
- Basic understanding of security fundamentals concepts
Output
- Generated configurations and code
- Best practice recommendations
- Validation results
Error Handling
| Error | Cause | Solution |
|---|---|---|
| Configuration invalid | Missing required fields | Check documentation for required parameters |
| Tool not found | Dependency not installed | Install required tools per prerequisites |
| Permission denied | Insufficient access | Verify credentials and permissions |
Resources
- Official documentation for related tools
- Best practices guides
- Community examples and tutorials
Related Skills
Part of the Security Fundamentals skill category. Tags: security, authentication, validation, owasp, secure-coding
© jeremylongshore, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in skills/03-security-fundamentals/cors-policy-validator of jeremylongshore/tons-of-skills-marketplace.
Open the folder on GitHubat commit cfae287
Compare with similar skills
Cors Policy Validator 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 |
|---|---|---|---|---|---|---|
| Cors Policy Validator this skilljeremylongshore/tons-of-skills-marketplace | 2.8k | — | ~583 | Automated safety check: Pass | MIT | |
| Deepsec Documentation Guidevercel-labs/deepsec | 8.1k | — | ~956 | Automated safety check: Pass | Apache-2.0 | |
| Skill Scannergetsentry/skills | 1k | 4 repos | ~2.5k | Automated safety check: Warn | Apache-2.0 | |
| Serenity Aleabitoreddityan-labs/serenity-aleabitoreddit | 481 | 1 repos | ~3.3k | Automated safety check: Pass | None | |
| Security Alert Triageelastic/agent-skills | 592 | 1 repos | ~3.5k | Automated safety check: Notes | Apache-2.0 | |
| Shiro Attack CLISummerSec/ShiroAttack2 | 2.6k | — | ~945 | Automated safety check: Pass | MIT |
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Categories
Questions about Cors Policy Validator
What does Cors Policy Validator do?
Validate cors policy validator operations. An agent skill from jeremylongshore/tons-of-skills-marketplace. Cors Policy Validator is an agent skill from jeremylongshore/tons-of-skills-marketplace. Validate cors policy validator operations.
When should I use Cors Policy Validator?
Cors Policy Validator fits situations like: : cors policy validator; cors policy validator Part of the Security Fundamentals skill category; working with cors policy validator functionality; with phrases like cors policy validator.
How do I install Cors Policy Validator in Claude Code?
Run `npx skills add jeremylongshore/tons-of-skills-marketplace --skill cors-policy-validator -a claude-code`. Or copy the skill folder (skills/03-security-fundamentals/cors-policy-validator in jeremylongshore/tons-of-skills-marketplace) into .claude/skills/cors-policy-validator in your project. Claude Code loads it when a task matches its description.
How do I install Cors Policy Validator in Codex?
Run `npx skills add jeremylongshore/tons-of-skills-marketplace --skill cors-policy-validator -a codex`. Or copy the skill folder (skills/03-security-fundamentals/cors-policy-validator in jeremylongshore/tons-of-skills-marketplace) into .agents/skills/cors-policy-validator in your project. Codex loads it when a task matches its description.
Can I use Cors Policy Validator 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 jeremylongshore/tons-of-skills-marketplace --skill cors-policy-validator -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/cors-policy-validator, .gemini/skills/cors-policy-validator, .github/skills/cors-policy-validator and .opencode/skills/cors-policy-validator in your project.
What does Cors Policy Validator need to run?
SKILL.md names no scripts, command-line tools or credentials: Cors Policy Validator is instructions for the agent only. Its frontmatter pre-approves these tools: Read, Write, Grep, Bash(npm:*). Compatibility (from SKILL.md): Designed for Claude Code.
Does Cors Policy Validator 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 Cors Policy Validator 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 Cors Policy Validator use?
Cors Policy Validator is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Cors Policy Validator use?
About 583 tokens (SKILL.md is roughly 2.3k 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 Cors Policy Validator?
Skills that share tags, products or a category with Cors Policy Validator: Deepsec Documentation Guide (vercel-labs/deepsec, 8.1k stars), Skill Scanner (getsentry/skills, 1k stars), Serenity Aleabitoreddit (yan-labs/serenity-aleabitoreddit, 481 stars) and Security Alert Triage (elastic/agent-skills, 592 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Cors Policy Validator?
jeremylongshore (a GitHub user) maintains it in jeremylongshore/tons-of-skills-marketplace, which has 2,827 GitHub stars. The repository holds 3,342 skills in this directory. The repository was last updated on October 10, 2026.
Source: jeremylongshore/tons-of-skills-marketplace on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.