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Agent skill

Form Captcha

by thedaviddias in thedaviddias/Front-End-Checklist

A skill your agent uses when reviewing public HTML forms (no authentication required to reach them) for bot and abuse protection mechanisms.

MITAuto-check passedBackend & APIs

Install Form Captcha

skills CLI
$ npx skills add thedaviddias/Front-End-Checklist --skill form-captcha -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install thedaviddias/Front-End-Checklist form-captcha --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/form-captcha .claude/skills/form-captcha && rm -rf skills-src

Use ~/.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/

Facts

Skill name
form-captcha
GitHub stars
74k
Token cost
~601 tokens
SKILL.md length
260 words
Files
2 (incl. references)
Skills in repo
390
Repo updated
First seen
Licence
MIT

At a glance

A skill your agent uses when reviewing public HTML forms (no authentication required to reach them) for bot and abuse protection mechanisms.

  • Reviewing public HTML forms (no authentication required to reach them) for bot and abuse protection mechanisms
  • SKILL.md covers Quick Reference, Check, Fix and Explain, plus 1 more section
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Form Captcha is an agent skill from thedaviddias/Front-End-Checklist. Use when reviewing public HTML forms (no authentication required to reach them) for bot and abuse protection mechanisms.

Its SKILL.md is about 600 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/rule.md`).

It sits in Backend & APIs. The repository describes itself as: 🗂 The essential checklist for modern web development, for humans and AI agents. The licence is MIT.

When your agent uses it

  • Reviewing public HTML forms (no authentication required to reach them) for bot and abuse protection mechanisms

Example prompts

  • “/form-captcha”

What it can do on your machine

Read from SKILL.md and the folder at commit e8d14d0. 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

    Links to these hosts (documentation or services it may open):

    • frontendchecklist.io

    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

Form Captcha loads about 601 tokens when it runs, and up to ~2.3k if it reads all its reference files. Until then it costs about 33 tokens; SKILL.md has 260 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~33
When it runs · the whole SKILL.md, loaded when a task matches
~601
With references · SKILL.md plus every file in references/, read only if the agent opens them
~2.3k

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 thedaviddias/Front-End-Checklist at commit e8d14d0, republished under its MIT licence (© thedaviddias). 260 words, ~601 tokens.

Download SKILL.mdSave it as .claude/skills/form-captcha/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
form-captcha
description
Use when reviewing public HTML forms (no authentication required to reach them) for bot and abuse protection mechanisms.
metadata.category
security
metadata.priority
medium
metadata.difficulty
intermediate
metadata.estimatedTime
30
metadata.source
frontendchecklist.io
metadata.url
https://frontendchecklist.io/rules/security/form-captcha

Protect public forms with CAPTCHA

An unprotected registration form can create thousands of spam accounts per minute; an unprotected login form enables credential stuffing attacks that test millions of username/password combinations from data breaches.

Quick Reference

  • Public forms (contact, registration, login, password reset, comment) without CAPTCHA are targets for automated abuse
  • Prefer invisible/automated solutions (Cloudflare Turnstile, Google reCAPTCHA v3, hCaptcha) over interactive challenges that harm UX
  • Always validate CAPTCHA tokens server-side — client-side validation is bypassable
  • Rate limiting is complementary to CAPTCHA but not a substitute — bots can solve rate limits with distributed attacks
  • Honeypot fields (hidden inputs that users never fill but bots do) are a lightweight CAPTCHA alternative for low-risk forms

Check

Identify all public-facing forms (contact, registration, login, password reset, newsletter, comment). Check whether each has CAPTCHA, honeypot fields, or server-side rate limiting. Verify any CAPTCHA tokens are validated server-side.

Fix

Integrate a CAPTCHA service (Cloudflare Turnstile, hCaptcha, or Google reCAPTCHA v3) on all public forms. Validate the CAPTCHA response token on your server before processing the form submission. Add rate limiting as a defense-in-depth measure.

Explain

Explain what credential stuffing and spam bot attacks are, how CAPTCHA protects public forms, the trade-offs between different CAPTCHA approaches (v2 checkbox, v3 invisible, Turnstile), and why server-side validation is required.

Code Review

Review server config, headers, forms, and integration points related to Protect public forms with CAPTCHA. Flag exact responses, cookies, or browser behaviors that violate the rule, and verify them against the effective production-like response.

For full implementation details, code examples, and framework-specific guidance, see references/rule.md.

Rule page: https://frontendchecklist.io/rules/security/form-captcha

© thedaviddias, 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 1 other file (references) in skills/form-captcha of thedaviddias/Front-End-Checklist.

  • SKILL.md
  • references/rule.md

Open the folder on GitHubat commit e8d14d0

Compare with similar skills

Form Captcha 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.

Form Captcha compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Form Captcha this skillthedaviddias/Front-End-Checklist74k—~601Automated safety check: PassMIT
Configuring Horizoncoollabsio/coolify63k4 repos~898Automated safety check: PassMIT
Nestjs Best Practicesrolling-scopes/rsschool-app10k6 repos~1.2kAutomated safety check: PassMIT
Sub2API AdminWei-Shaw/sub2api44k1 repos~717Automated safety check: PassLGPL-3.0
Firecrawl Build Onboardingfirecrawl/firecrawl190k1 repos~1.4kAutomated safety check: NotesISC
Obsidian BasesAtmosphere/atmosphere3.8k22 repos~3.2kAutomated safety check: PassApache-2.0

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    63k GitHub starsUsed in 4 repos~898 tokens
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  • Nestjs Best Practices

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Categories

Questions about Form Captcha

What does Form Captcha do?

A skill your agent uses when reviewing public HTML forms (no authentication required to reach them) for bot and abuse protection mechanisms. Form Captcha is an agent skill from thedaviddias/Front-End-Checklist. Use when reviewing public HTML forms (no authentication required to reach them) for bot and abuse protection mechanisms.

When should I use Form Captcha?

Form Captcha fits situations like: reviewing public HTML forms (no authentication required to reach them) for bot and abuse protection mechanisms.

How do I install Form Captcha in Claude Code?

Run `npx skills add thedaviddias/Front-End-Checklist --skill form-captcha -a claude-code`. Or copy the skill folder (skills/form-captcha in thedaviddias/Front-End-Checklist) into .claude/skills/form-captcha in your project. Claude Code loads it when a task matches its description.

How do I install Form Captcha in Codex?

Run `npx skills add thedaviddias/Front-End-Checklist --skill form-captcha -a codex`. Or copy the skill folder (skills/form-captcha in thedaviddias/Front-End-Checklist) into .agents/skills/form-captcha in your project. Codex loads it when a task matches its description.

Can I use Form Captcha 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 thedaviddias/Front-End-Checklist --skill form-captcha -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/form-captcha, .gemini/skills/form-captcha, .github/skills/form-captcha and .opencode/skills/form-captcha in your project.

What does Form Captcha need to run?

SKILL.md names no scripts, command-line tools or credentials: Form Captcha is instructions for the agent only.

Does Form Captcha access the network?

SKILL.md names 1 domain. As links in the text: frontendchecklist.io. This is read from the text; nothing was executed.

Is Form Captcha 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 Form Captcha use?

Form Captcha 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 Form Captcha use?

About 601 tokens (SKILL.md is roughly 2.4k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 1.7k tokens, read only when the agent opens those files.

What are the alternatives to Form Captcha?

Skills that share tags, products or a category with Form Captcha: Configuring Horizon (coollabsio/coolify, 63k stars), Nestjs Best Practices (rolling-scopes/rsschool-app, 10k stars), Sub2API Admin (Wei-Shaw/sub2api, 44k stars) and Firecrawl Build Onboarding (firecrawl/firecrawl, 190k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Form Captcha?

thedaviddias (a GitHub user) maintains it in thedaviddias/Front-End-Checklist, which has 74,412 GitHub stars. The repository holds 390 skills in this directory. The repository was last updated on October 6, 2026.

Source: thedaviddias/Front-End-Checklist on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.