Guide · Agent skill
How to use the Form CAPTCHA Protection Checker agent skill
Updated · written with AI from the project's own documentation and checked against our catalogue data
The form-captcha skill is an agent skill, a folder of instructions that an AI agent such as Claude loads when a task matches it. Once installed, it guides the agent through reviewing public HTML forms for bot and abuse protection. This guide explains what the skill does, how to install it, how to phrase requests so it triggers, and what to keep in mind before using it.
Form CAPTCHA Protection Checkerthedaviddias/Front-End-Checklist · MIT Download the skill Quick start
- 1Download the ZIP. Download the form-captcha skill ZIP from this page.
- 2Unzip the folder. Extract the archive so you have a folder containing SKILL.md and references/rule.md.
- 3Place the skill. Move the folder to ~/.claude/skills/ for personal use or to .claude/skills/ inside a project.
- 4Or upload it in the Claude apps. In the Claude apps, go to Settings → Capabilities → Skills and upload the skill.
- 5Ask for a review. Describe the public form you want checked, mentioning bots, spam or abuse.
- 6Apply the fixes. Review the agent's findings and add CAPTCHA, honeypots, rate limiting or server-side token checks as appropriate.
What does the form-captcha skill make the agent do?
The skill targets public-facing forms that do not require authentication to reach, such as contact, registration, login, password reset, newsletter and comment forms. For each one, the agent checks whether there is a CAPTCHA, a honeypot field (a hidden input that people never fill in but bots often do), or server-side rate limiting.
It also checks that any CAPTCHA token is validated on the server, because client-side validation can be bypassed. Where protection is missing, the skill suggests fixes using Cloudflare Turnstile, hCaptcha or Google reCAPTCHA v3.
The skill is a checklist-style review guide, not an automated scanner. It does not test live sites for you.
- Identifies public forms and checks each for bot protection
- Verifies that CAPTCHA tokens are validated server-side
- Suggests fixes and explains trade-offs between CAPTCHA approaches
- Points to references/rule.md for fuller implementation details
How do you install the form-captcha skill?
Download the ZIP of the skill from this page and unzip it. For a personal setup, place the unzipped folder in ~/.claude/skills/. For a single project, place it in that project's .claude/skills/ folder.
If you use the Claude apps, you can instead upload the skill under Settings → Capabilities → Skills.
- Personal install: ~/.claude/skills/
- Project install: .claude/skills/ inside your project
- Claude apps: Settings → Capabilities → Skills, then upload
Which files does the skill contain?
The skill folder holds two files. SKILL.md is the main instruction file and contains a short summary of the check, fix and explain steps. references/rule.md holds the longer material, including code examples such as the Cloudflare Turnstile integration.
- SKILL.md: main instructions and metadata
- references/rule.md: detailed guidance and code examples
How do you trigger the skill with a natural request?
You do not need a special command. Describe the task in plain language that mentions public forms and bots or abuse. The agent should match the request to the skill's description, which is about reviewing public HTML forms for bot and abuse protection.
Give the agent the context it needs, such as the form's location in your code or the page you are reviewing, so it knows what to inspect.
- "Review the sign-up form in my app for bot protection."
- "Check whether our contact form has a CAPTCHA or honeypot, and whether the token is verified on the server."
- "Audit our public login and password reset forms for credential stuffing exposure."
What should you expect from the output?
Expect the agent to walk through each public form and report whether it has CAPTCHA, a honeypot, or rate limiting, and whether any CAPTCHA token is checked on the server. It may suggest a service such as Cloudflare Turnstile, hCaptcha or reCAPTCHA v3 and explain the trade-offs.
Forms behind authentication are outside the skill's scope, and the skill says they do not need this treatment.
- Per-form findings: protected or unprotected, and why
- Server-side validation gaps
- Suggested fixes with the trade-offs of each option
What are the safety notes?
The skill does not run scripts and does not use the network, according to its metadata. It gives review guidance only.
Only review forms you own or have permission to review. Reviewing someone else's forms without authorization may be unlawful, and the skill does not authorise testing live sites for vulnerabilities.
- Runs scripts: no
- Uses network: no
- Requires: nothing listed
- Only review forms you are authorised to review
What people use it for
- Reviewing a public sign-up form for spam account risk
- Checking a contact form for a CAPTCHA and server-side token validation
- Auditing login and password reset forms for credential stuffing exposure
- Comparing Cloudflare Turnstile, hCaptcha and reCAPTCHA v3 for a site's forms
- Teaching a team why bot protection on forms matters
Frequently asked questions
Do I need to install anything to use the form-captcha skill?
The skill's metadata lists no requirements, and it does not run scripts. You install it by unzipping the downloaded folder into ~/.claude/skills/ or a project's .claude/skills/, or by uploading it under Settings → Capabilities → Skills in the Claude apps.
Is the form-captcha skill free?
The skill is published under the MIT licence. The source material does not state any price, so check the licence text in the repository for the terms.
Does the skill scan my website automatically?
No. It is a checklist-style guide for review, not an automated scanner. The agent checks the forms and code you point it to.
Which forms does the skill cover?
It covers public forms that do not require authentication, such as contact, registration, login, password reset, newsletter and comment forms. Forms behind authentication are outside its scope.
Why does the skill insist on server-side CAPTCHA validation?
Client-side checks can be bypassed, so the CAPTCHA response token must be validated on your server before the form submission is processed. The skill also notes that rate limiting complements CAPTCHA but does not replace it.
Can I use this skill to test someone else's website?
Only with authorisation. The skill gives review guidance and does not authorise testing live sites for vulnerabilities, and reviewing someone else's forms without permission may be unlawful.
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Our verdict
Use form-captcha if you build or maintain public sign-up, login or contact forms and want a focused checklist for bot protection and server-side token validation. Pick something else if you need a complete security audit or automated scanning, because this skill covers one narrow topic and keeps its main text brief.
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