Form Validation
thedaviddias/Front-End-Checklist
A skill your agent uses when reviewing templates, rendered HTML, or shared components related to Validate forms accessibly.
A well-formed example skill for testing the validator. An agent skill from agent-ecosystem/skill-validator.
MITAuto-check: notes
Install Valid Skill
$ npx skills add agent-ecosystem/skill-validator --skill valid-skill -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install agent-ecosystem/skill-validator valid-skill --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/agent-ecosystem/skill-validator.git skills-src && mkdir -p .claude/skills && cp -r skills-src/testdata/valid-skill .claude/skills/valid-skill && 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 "valid-skill" agent skill from https://github.com/agent-ecosystem/skill-validator/tree/main/testdata/valid-skill into .claude/skills/valid-skill/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "valid-skill", 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/agent-ecosystem/skill-validator/tree/main/testdata/valid-skillType 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 agent-ecosystem/skill-validator --skill valid-skill -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install agent-ecosystem/skill-validator valid-skill --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/agent-ecosystem/skill-validator.git skills-src && mkdir -p .agents/skills && cp -r skills-src/testdata/valid-skill .agents/skills/valid-skill && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "valid-skill" agent skill from https://github.com/agent-ecosystem/skill-validator/tree/main/testdata/valid-skill into .agents/skills/valid-skill/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "valid-skill", 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 agent-ecosystem/skill-validator --skill valid-skill -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install agent-ecosystem/skill-validator valid-skill --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/agent-ecosystem/skill-validator.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/testdata/valid-skill .cursor/skills/valid-skill && 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 "valid-skill" agent skill from https://github.com/agent-ecosystem/skill-validator/tree/main/testdata/valid-skill into .cursor/skills/valid-skill/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "valid-skill", 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/agent-ecosystem/skill-validator.git --path testdata/valid-skill--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 agent-ecosystem/skill-validator --skill valid-skill -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install agent-ecosystem/skill-validator valid-skill --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/agent-ecosystem/skill-validator.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/testdata/valid-skill .gemini/skills/valid-skill && 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 "valid-skill" agent skill from https://github.com/agent-ecosystem/skill-validator/tree/main/testdata/valid-skill into .gemini/skills/valid-skill/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "valid-skill", 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 agent-ecosystem/skill-validator valid-skillInstalls 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 agent-ecosystem/skill-validator --skill valid-skill -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/agent-ecosystem/skill-validator.git skills-src && mkdir -p .github/skills && cp -r skills-src/testdata/valid-skill .github/skills/valid-skill && 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 "valid-skill" agent skill from https://github.com/agent-ecosystem/skill-validator/tree/main/testdata/valid-skill into .github/skills/valid-skill/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "valid-skill", 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 agent-ecosystem/skill-validator --skill valid-skill -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install agent-ecosystem/skill-validator valid-skill --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/agent-ecosystem/skill-validator.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/testdata/valid-skill .opencode/skills/valid-skill && 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 "valid-skill" agent skill from https://github.com/agent-ecosystem/skill-validator/tree/main/testdata/valid-skill into .opencode/skills/valid-skill/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "valid-skill", 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
valid-skill- GitHub stars
- 256
- Token cost
- ~146 tokens
- SKILL.md length
- 45 words
- Files
- 4 (incl. scripts, references, assets)
- Skills in repo
- 4
- Repo updated
- First seen
- Licence
- MIT
At a glance
A well-formed example skill for testing the validator. An agent skill from agent-ecosystem/skill-validator.
- SKILL.md covers Usage and Notes
- Runs Shell scripts from its folder
What it does
Valid Skill is an agent skill from agent-ecosystem/skill-validator. A well-formed example skill for testing the validator.
Its SKILL.md is about 150 tokens, which your agent loads only when the skill is triggered. The skill folder holds 6 other files, including scripts, reference files and assets (for example `assets/template.md`, `references/guide.md` and `scripts/setup.sh`). Compatibility notes: Works with all major LLM providers.
The repository describes itself as: Validate Skill content against Agent Skill specification, with additional content density and quality checks. The licence is MIT.
Example prompts
- “/valid-skill”
Requirements
- A Bash shell
- Compatibility (from SKILL.md): Works with all major LLM providers.
- Pre-approved tools (allowed-tools): Bash, Read, Write
What it can do on your machine
Read from SKILL.md and the folder at commit 08e2f74. 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:
BashReadWrite
From allowed-tools in the SKILL.md frontmatter.
Runs code
Ships 1 file in scripts/ (Shell), which the agent can run.
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
Works with all major LLM providers.
From compatibility in the SKILL.md frontmatter.
Context cost
Valid Skill loads about 146 tokens when it runs, and up to ~179 if it reads all its reference files. Until then it costs about 17 tokens; SKILL.md has 45 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: notes
The automated check noted patterns worth knowing about, such as sudo or a known installer.
- NotePre-approves every shell command (allowed-tools: Bash)SKILL.md
allowed-tools: Bash, Read, Write
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); the scripts in this folder are not scanned.
SKILL.md
The full file from agent-ecosystem/skill-validator at commit 08e2f74, republished under its MIT licence (© agent-ecosystem). 45 words, ~146 tokens.
Download SKILL.mdSave it as
.claude/skills/valid-skill/SKILL.md (or your agent's skills folder). This skill also uses 3 other files; get the full folder from GitHub.- name
- valid-skill
- description
- A well-formed example skill for testing the validator.
- allowed-tools
- Bash, Read, Write
- compatibility
- Works with all major LLM providers.
- license
- MIT
- metadata.author
- test
- metadata.version
- 1.0
Valid Skill
This is a valid skill that should pass all validation checks.
Usage
Follow the instructions in the reference guide to get started.
Use the asset template as a starting point and run scripts/setup.sh to configure.
Notes
This skill demonstrates proper structure and frontmatter.
© agent-ecosystem, 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 3 other files (scripts, references, assets) in testdata/valid-skill of agent-ecosystem/skill-validator.
- SKILL.md
- assets/template.md
- references/guide.md
- scripts/setup.sh
Open the folder on GitHubat commit 08e2f74
Compare with similar skills
Valid Skill 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 |
|---|---|---|---|---|---|---|
| Valid Skill this skillagent-ecosystem/skill-validator | 256 | — | ~146 | Automated safety check: Notes | MIT | |
| Form Validationthedaviddias/Front-End-Checklist | 74k | — | ~633 | Automated safety check: Pass | MIT | |
| Django Forms Validation TDDhashgraph-online/awesome-codex-plugins | 1.3k | — | ~845 | Automated safety check: Pass | MIT | |
| Formstrycompai/comp | 2k | — | ~1k | Automated safety check: Pass | AGPL-3.0 | |
| Form Fillingasgeirtj/system_prompts_leaks | 69k | — | ~400 | Automated safety check: Pass | CC0-1.0 | |
| Verify Form Validationreticlehq/reticle | 1.2k | — | ~1.6k | Automated safety check: Pass | Apache-2.0 |
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Form Filling
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Fill out online forms (Google Forms, Typeform and similar) or PDF, Word and DocuSign forms; prepare a reviewable draft and get approval before submitting or sending.
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Check that a form actually rejects bad input: the error message renders, the submit button stays disabled, and no request goes out.
Validate
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Schema validation for notes. An agent skill from agenticnotetaking/arscontexta.
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Questions about Valid Skill
What does Valid Skill do?
A well-formed example skill for testing the validator. An agent skill from agent-ecosystem/skill-validator. Valid Skill is an agent skill from agent-ecosystem/skill-validator. A well-formed example skill for testing the validator.
How do I install Valid Skill in Claude Code?
Run `npx skills add agent-ecosystem/skill-validator --skill valid-skill -a claude-code`. Or copy the skill folder (testdata/valid-skill in agent-ecosystem/skill-validator) into .claude/skills/valid-skill in your project. Claude Code loads it when a task matches its description.
How do I install Valid Skill in Codex?
Run `npx skills add agent-ecosystem/skill-validator --skill valid-skill -a codex`. Or copy the skill folder (testdata/valid-skill in agent-ecosystem/skill-validator) into .agents/skills/valid-skill in your project. Codex loads it when a task matches its description.
Can I use Valid Skill 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 agent-ecosystem/skill-validator --skill valid-skill -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/valid-skill, .gemini/skills/valid-skill, .github/skills/valid-skill and .opencode/skills/valid-skill in your project.
What does Valid Skill need to run?
Going by SKILL.md and its folder, Valid Skill needs a shell for the scripts in its folder. Our summary lists: A Bash shell. Its frontmatter pre-approves these tools: Bash, Read, Write. Compatibility (from SKILL.md): Works with all major LLM providers..
Does Valid Skill 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 Valid Skill safe to install?
Our automated static check of SKILL.md found notes only (pre-approves every shell command (allowed-tools: bash)), nothing it rates as a warning. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.
What licence does Valid Skill use?
Valid Skill 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 Valid Skill use?
About 146 tokens (SKILL.md is roughly 584 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 33 tokens, read only when the agent opens those files.
What are the alternatives to Valid Skill?
Skills that share tags, products or a category with Valid Skill: Form Validation (thedaviddias/Front-End-Checklist, 74k stars), Django Forms Validation TDD (hashgraph-online/awesome-codex-plugins, 1.3k stars), Forms (trycompai/comp, 2k stars) and Form Filling (asgeirtj/system_prompts_leaks, 69k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Valid Skill?
agent-ecosystem (a GitHub organization) maintains it in agent-ecosystem/skill-validator, which has 256 GitHub stars. The repository holds 4 skills in this directory. The repository was last updated on September 20, 2026.
Source: agent-ecosystem/skill-validator on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.