Form Validation
thedaviddias/Front-End-Checklist
A skill your agent uses when reviewing templates, rendered HTML, or shared components related to Validate forms accessibly.
Validates skills in this repo against agentskills.io spec and Claude Code best practices.
OfficialMITAuto-check passed
Install Validate Skills
$ npx skills add callstackincubator/agent-skills --skill validate-skills -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install callstackincubator/agent-skills validate-skills --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/callstackincubator/agent-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/validate-skills .claude/skills/validate-skills && 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 "validate-skills" agent skill from https://github.com/callstackincubator/agent-skills/tree/main/.claude/skills/validate-skills into .claude/skills/validate-skills/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "validate-skills", 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/callstackincubator/agent-skills/tree/main/.claude/skills/validate-skillsType 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 callstackincubator/agent-skills --skill validate-skills -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install callstackincubator/agent-skills validate-skills --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/callstackincubator/agent-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.claude/skills/validate-skills .agents/skills/validate-skills && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "validate-skills" agent skill from https://github.com/callstackincubator/agent-skills/tree/main/.claude/skills/validate-skills into .agents/skills/validate-skills/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "validate-skills", 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 callstackincubator/agent-skills --skill validate-skills -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install callstackincubator/agent-skills validate-skills --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/callstackincubator/agent-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.claude/skills/validate-skills .cursor/skills/validate-skills && 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 "validate-skills" agent skill from https://github.com/callstackincubator/agent-skills/tree/main/.claude/skills/validate-skills into .cursor/skills/validate-skills/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "validate-skills", 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/callstackincubator/agent-skills.git --path .claude/skills/validate-skills--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 callstackincubator/agent-skills --skill validate-skills -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install callstackincubator/agent-skills validate-skills --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/callstackincubator/agent-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.claude/skills/validate-skills .gemini/skills/validate-skills && 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 "validate-skills" agent skill from https://github.com/callstackincubator/agent-skills/tree/main/.claude/skills/validate-skills into .gemini/skills/validate-skills/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "validate-skills", 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 callstackincubator/agent-skills validate-skillsInstalls 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 callstackincubator/agent-skills --skill validate-skills -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/callstackincubator/agent-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/.claude/skills/validate-skills .github/skills/validate-skills && 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 "validate-skills" agent skill from https://github.com/callstackincubator/agent-skills/tree/main/.claude/skills/validate-skills into .github/skills/validate-skills/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "validate-skills", 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 callstackincubator/agent-skills --skill validate-skills -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install callstackincubator/agent-skills validate-skills --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/callstackincubator/agent-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.claude/skills/validate-skills .opencode/skills/validate-skills && 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 "validate-skills" agent skill from https://github.com/callstackincubator/agent-skills/tree/main/.claude/skills/validate-skills into .opencode/skills/validate-skills/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "validate-skills", 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
validate-skills- GitHub stars
- 1.7k
- Token cost
- ~665 tokens
- SKILL.md length
- 256 words
- Files
- 1
- Skills in repo
- 12
- Repo updated
- First seen
- Licence
- MIT
At a glance
Validates skills in this repo against agentskills.io spec and Claude Code best practices.
- Works in 3 steps: Find all skill directories → For each skill, read SKILL.md and check… → Report issues in this format
- SKILL.md covers Validation Checklist, How to Run and References
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Validate Skills is an agent skill from callstackincubator/agent-skills, published by the product's own GitHub organization. Validates skills in this repo against agentskills.io spec and Claude Code best practices. Use via /validate-skills command.
Its SKILL.md is about 670 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
The repository describes itself as: A collection of agent-optimized React Native skills for AI coding assistants. The licence is MIT.
Example prompts
- “Use the validate-skills skill to validate skills in this repo against agentskills.io spec and Claude Code best practices”
- “/validate-skills”
Workflow steps
3 steps, taken from the first numbered list in SKILL.md.
- Find all skill directories
- For each skill, read SKILL.md and check against the rules above
- Report issues in this format
What it can do on your machine
Read from SKILL.md and the folder at commit 61e6e7d. 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 (its code samples are bash).
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):
agentskills.ioplatform.claude.com
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
Validate Skills loads about 665 tokens when it runs. Until then it costs about 35 tokens; SKILL.md has 256 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 callstackincubator/agent-skills at commit 61e6e7d, republished under its MIT licence (© callstackincubator). 256 words, ~665 tokens.
Download SKILL.mdSave it as
.claude/skills/validate-skills/SKILL.md (or your agent's skills folder).- name
- validate-skills
- description
- Validates skills in this repo against agentskills.io spec and Claude Code best practices. Use via /validate-skills command.
- license
- MIT
- metadata.author
- Callstack
- metadata.tags
- validation, linting, skill-authoring
Validate Skills
Validate all skills in skills/ against the agentskills.io spec and Claude Code best practices.
Validation Checklist
For each skill directory, verify:
Spec Compliance (agentskills.io)
| Check | Rule |
|---|---|
name format | 1-64 chars, lowercase alphanumeric + hyphens, no leading/trailing/consecutive hyphens |
name matches directory | Directory name must equal name field |
description length | 1-1024 characters, non-empty |
| Optional fields valid | license, metadata, compatibility if present |
Best Practices (Claude Code)
| Check | Rule |
|---|---|
| Description format | Third person, describes what + when to use |
| Body length | Under 500 lines |
| Loading is one-level deep | SKILL.md is the only progressive-disclosure entry point: every reference file must be reachable from SKILL.md. References may cross-link each other for navigation (see note below). |
| Links are markdown | Use [text](path) not bare filenames |
| No redundancy | Don't repeat description in body |
| Concise | Only add context Claude doesn't already have |
One-level-deep vs. cross-linking. The one-level-deep rule targets progressive-disclosure loading chains — a reference that can only be discovered by loading another reference first (
SKILL.md→a.md→b.md, whereb.mdis not linked fromSKILL.md). That is a defect: it hides content from the loader.It does not forbid navigational cross-links. Per AGENTS.md, reference files end with a "Related Skills" footer linking sibling references, and this is required. A cross-link is fine as long as both endpoints are also reachable directly from
SKILL.md. Only flag a reference that is reachable exclusively through another reference.
How to Run
Find all skill directories:
bash fd -t d -d 1 . skills/For each skill, read
SKILL.mdand check against the rules aboveReport issues in this format:
## Validation Results ### skills/example-skill - [PASS] name format valid - [FAIL] name "example" doesn't match directory "example-skill" - [PASS] description length OK (156 chars)
References
© callstackincubator, 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 .claude/skills/validate-skills of callstackincubator/agent-skills.
Open the folder on GitHubat commit 61e6e7d
Compare with similar skills
Validate Skills 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 |
|---|---|---|---|---|---|---|
| Validate Skills this skillcallstackincubator/agent-skills | 1.7k | — | ~665 | Automated safety check: Pass | MIT | |
| Form Validationthedaviddias/Front-End-Checklist | 74k | — | ~633 | Automated safety check: Pass | MIT | |
| Validateagenticnotetaking/arscontexta | 3.5k | — | ~3k | Automated safety check: Pass | MIT | |
| Zod Validation Expertdavila7/claude-code-templates | 32k | 3 repos | ~2.4k | Automated safety check: Pass | MIT | |
| Agent Production Validatorruvnet/ruflo | 74k | 2 repos | ~3k | Automated safety check: Pass | MIT | |
| Validate Pluginruvnet/ruflo | 74k | — | ~511 | Automated safety check: Notes | MIT |
Similar skills
Validate
agenticnotetaking/arscontexta
Schema validation for notes. An agent skill from agenticnotetaking/arscontexta.
Zod Validation Expert
davila7/claude-code-templates
Expert in Zod — TypeScript-first schema validation. An agent skill from davila7/claude-code-templates.
Agent Production Validator
ruvnet/ruflo
Agent skill for production-validator - invoke with $agent-production-validator
Validate Plugin
ruvnet/ruflo
Validate a Claude Code plugin structure, frontmatter, and MCP tool references
Migrate Validate
ruvnet/ruflo
Validate pending migrations for foreign key consistency, rollback safety, and best practices
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Questions about Validate Skills
What does Validate Skills do?
Validates skills in this repo against agentskills.io spec and Claude Code best practices. Validate Skills is an agent skill from callstackincubator/agent-skills, published by the product's own GitHub organization.io spec and Claude Code best practices.
How do I install Validate Skills in Claude Code?
Run `npx skills add callstackincubator/agent-skills --skill validate-skills -a claude-code`. Or copy the skill folder (.claude/skills/validate-skills in callstackincubator/agent-skills) into .claude/skills/validate-skills in your project. Claude Code loads it when a task matches its description.
How do I install Validate Skills in Codex?
Run `npx skills add callstackincubator/agent-skills --skill validate-skills -a codex`. Or copy the skill folder (.claude/skills/validate-skills in callstackincubator/agent-skills) into .agents/skills/validate-skills in your project. Codex loads it when a task matches its description.
Can I use Validate Skills 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 callstackincubator/agent-skills --skill validate-skills -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/validate-skills, .gemini/skills/validate-skills, .github/skills/validate-skills and .opencode/skills/validate-skills in your project.
What does Validate Skills need to run?
SKILL.md names no scripts, command-line tools or credentials: Validate Skills is instructions for the agent only.
Does Validate Skills access the network?
SKILL.md names 2 domains. As links in the text: agentskills.io and platform.claude.com. This is read from the text; nothing was executed.
Is Validate Skills 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 Validate Skills use?
Validate Skills 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 Validate Skills use?
About 665 tokens (SKILL.md is roughly 2.7k 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 Validate Skills?
Skills that share tags, products or a category with Validate Skills: Form Validation (thedaviddias/Front-End-Checklist, 74k stars), Validate (agenticnotetaking/arscontexta, 3.5k stars), Zod Validation Expert (davila7/claude-code-templates, 32k stars) and Agent Production Validator (ruvnet/ruflo, 74k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Validate Skills?
callstackincubator (a GitHub organization, an official publisher) maintains it in callstackincubator/agent-skills, which has 1,664 GitHub stars. The repository holds 12 skills in this directory. The repository was last updated on October 6, 2026.
Source: callstackincubator/agent-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.