@pierre/diffs Code Rendering
pierrecomputer/pierre
Guides an agent through using @pierre/diffs to render syntax-highlighted files and diffs, and to build editing and review surfaces in React or plain JavaScript.
Rules for writing a Handsontable cell validator: a callback-based function bound to the cell properties that must always call back and never modify data or the DOM.
Install Handsontable Validator Development
$ npx skills add handsontable/handsontable --skill handsontable-validator-dev -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install handsontable/handsontable handsontable-validator-dev --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/handsontable/handsontable.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/handsontable-validator-dev .claude/skills/handsontable-validator-dev && 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 "handsontable-validator-dev" agent skill from https://github.com/handsontable/handsontable/tree/develop/.claude/skills/handsontable-validator-dev into .claude/skills/handsontable-validator-dev/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "handsontable-validator-dev", 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/handsontable/handsontable/tree/develop/.claude/skills/handsontable-validator-devType 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 handsontable/handsontable --skill handsontable-validator-dev -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install handsontable/handsontable handsontable-validator-dev --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/handsontable/handsontable.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.claude/skills/handsontable-validator-dev .agents/skills/handsontable-validator-dev && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "handsontable-validator-dev" agent skill from https://github.com/handsontable/handsontable/tree/develop/.claude/skills/handsontable-validator-dev into .agents/skills/handsontable-validator-dev/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "handsontable-validator-dev", 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 handsontable/handsontable --skill handsontable-validator-dev -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install handsontable/handsontable handsontable-validator-dev --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/handsontable/handsontable.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.claude/skills/handsontable-validator-dev .cursor/skills/handsontable-validator-dev && 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 "handsontable-validator-dev" agent skill from https://github.com/handsontable/handsontable/tree/develop/.claude/skills/handsontable-validator-dev into .cursor/skills/handsontable-validator-dev/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "handsontable-validator-dev", 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/handsontable/handsontable.git --path .claude/skills/handsontable-validator-dev--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 handsontable/handsontable --skill handsontable-validator-dev -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install handsontable/handsontable handsontable-validator-dev --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/handsontable/handsontable.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.claude/skills/handsontable-validator-dev .gemini/skills/handsontable-validator-dev && 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 "handsontable-validator-dev" agent skill from https://github.com/handsontable/handsontable/tree/develop/.claude/skills/handsontable-validator-dev into .gemini/skills/handsontable-validator-dev/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "handsontable-validator-dev", 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 handsontable/handsontable handsontable-validator-devInstalls 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 handsontable/handsontable --skill handsontable-validator-dev -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/handsontable/handsontable.git skills-src && mkdir -p .github/skills && cp -r skills-src/.claude/skills/handsontable-validator-dev .github/skills/handsontable-validator-dev && 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 "handsontable-validator-dev" agent skill from https://github.com/handsontable/handsontable/tree/develop/.claude/skills/handsontable-validator-dev into .github/skills/handsontable-validator-dev/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "handsontable-validator-dev", 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 handsontable/handsontable --skill handsontable-validator-dev -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install handsontable/handsontable handsontable-validator-dev --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/handsontable/handsontable.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.claude/skills/handsontable-validator-dev .opencode/skills/handsontable-validator-dev && 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 "handsontable-validator-dev" agent skill from https://github.com/handsontable/handsontable/tree/develop/.claude/skills/handsontable-validator-dev into .opencode/skills/handsontable-validator-dev/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "handsontable-validator-dev", 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
handsontable-validator-dev- GitHub stars
- 22k
- Token cost
- ~742 tokens
- SKILL.md length
- 257 words
- Files
- 1
- Skills in repo
- 31
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Rules for writing a Handsontable cell validator: a callback-based function bound to the cell properties that must always call back and never modify data or the DOM.
- Creating a new Handsontable cell validator
- SKILL.md covers Signature, Rules, Files and Triggers, plus 3 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Changing the validation rules of an existing validator
What it does
A validator takes the cell value and a callback, and runs with this bound to the cell's cellProperties, so it must be a regular function rather than an arrow function. It has to call the callback on every code path, because a missed call hangs the validation pipeline and silently blocks editing. It only decides validity, leaving data, DOM and cell state alone, and the callback may fire after async work while the editor waits.
Validators sit in their own folder under src/validators and are registered through registerValidator. They are triggered by the editor system when editing finishes and by the validateCells, validateRows and validateColumns calls, and the invalid class on cells comes from the renderer pipeline, not the validator. Numeric, date and autocomplete validators serve as references. If a validator writes a corrected value with setDataAtCell, the source string must end in Validator so the correction is tracked when async columns resolve later.
When your agent uses it
- Creating a new Handsontable cell validator
- Changing the validation rules of an existing validator
- Debugging a cell that cannot be edited because validation never finishes
Example prompts
- “Write a validator that accepts only positive integers and honors allowEmpty.”
- “Why does my validator freeze editing on empty cells?”
- “Make the validator correct trailing spaces with setDataAtCell without losing the change.”
Requirements
- A checkout of the Handsontable repository
What it can do on your machine
Read from SKILL.md and the folder at commit fff66b1. 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 javascript).
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.
Context cost
Handsontable Validator Development loads about 742 tokens when it runs. Until then it costs about 43 tokens; SKILL.md has 257 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
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 257 words (~742 tokens).
- name
- handsontable-validator-dev
- path
- handsontable/src/validators/**
Files
Just SKILL.md in .claude/skills/handsontable-validator-dev of handsontable/handsontable.
Open the folder on GitHubat commit fff66b1
Compare with similar skills
Handsontable Validator Development 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 |
|---|---|---|---|---|---|---|
| Handsontable Validator Development this skillhandsontable/handsontable | 22k | — | ~742 | Automated safety check: Pass | Custom licence | |
| @pierre/diffs Code Renderingpierrecomputer/pierre | 6.2k | 2 repos | ~803 | Automated safety check: Pass | Apache-2.0 | |
| Buefy Vue UI Componentsbuefy/buefy | 9.5k | — | ~8.2k | Automated safety check: Pass | MIT | |
| HTML CoderTokenRhythm/opensquilla | 7.1k | — | ~1.4k | Automated safety check: Pass | Apache-2.0 | |
| Chamilo Vue Base Componentschamilo/chamilo-lms | 1k | — | ~7.6k | Automated safety check: Notes | GPL-3.0 | |
| Frontend UI Patternsbiersoeckli/QuickStack | 362 | — | ~704 | Automated safety check: Pass | GPL-3.0 |
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Related
Categories
Questions about Handsontable Validator Development
What does Handsontable Validator Development do?
Rules for writing a Handsontable cell validator: a callback-based function bound to the cell properties that must always call back and never modify data or the DOM. A validator takes the cell value and a callback, and runs with this bound to the cell's cellProperties, so it must be a regular function rather than an arrow function. It has to call the callback on every code path, because a missed call hangs the validation pipeline and silently blocks editing.
When should I use Handsontable Validator Development?
Handsontable Validator Development fits situations like: creating a new Handsontable cell validator; changing the validation rules of an existing validator; debugging a cell that cannot be edited because validation never finishes.
How do I install Handsontable Validator Development in Claude Code?
Run `npx skills add handsontable/handsontable --skill handsontable-validator-dev -a claude-code`. Or copy the skill folder (.claude/skills/handsontable-validator-dev in handsontable/handsontable) into .claude/skills/handsontable-validator-dev in your project. Claude Code loads it when a task matches its description.
How do I install Handsontable Validator Development in Codex?
Run `npx skills add handsontable/handsontable --skill handsontable-validator-dev -a codex`. Or copy the skill folder (.claude/skills/handsontable-validator-dev in handsontable/handsontable) into .agents/skills/handsontable-validator-dev in your project. Codex loads it when a task matches its description.
Can I use Handsontable Validator Development 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 handsontable/handsontable --skill handsontable-validator-dev -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/handsontable-validator-dev, .gemini/skills/handsontable-validator-dev, .github/skills/handsontable-validator-dev and .opencode/skills/handsontable-validator-dev in your project.
What does Handsontable Validator Development need to run?
SKILL.md names no scripts, command-line tools or credentials: Handsontable Validator Development is instructions for the agent only. Our summary lists: A checkout of the Handsontable repository.
Does Handsontable Validator Development 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 Handsontable Validator Development 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 Handsontable Validator Development use?
Handsontable Validator Development has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.
How many tokens does Handsontable Validator Development use?
About 742 tokens (SKILL.md is roughly 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 Handsontable Validator Development?
Skills that share tags, products or a category with Handsontable Validator Development: @pierre/diffs Code Rendering (pierrecomputer/pierre, 6.2k stars), Buefy Vue UI Components (buefy/buefy, 9.5k stars), HTML Coder (TokenRhythm/opensquilla, 7.1k stars) and Chamilo Vue Base Components (chamilo/chamilo-lms, 1k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Handsontable Validator Development?
handsontable (a GitHub organization) maintains it in handsontable/handsontable, which has 22,060 GitHub stars. The repository holds 31 skills in this directory. The repository was last updated on October 8, 2026.
Source: handsontable/handsontable on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.