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Agent skill

Typebox

by EpicenterHQ in EpicenterHQ/epicenter

TypeBox patterns for runtime schema validation and JSON Schema generation.

Custom licenceAuto-check passedFrontend & Design

Install Typebox

skills CLI
$ npx skills add EpicenterHQ/epicenter --skill typebox -a claude-code

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

GitHub CLI
$ gh skill install EpicenterHQ/epicenter typebox --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/EpicenterHQ/epicenter.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/typebox .claude/skills/typebox && 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
typebox
GitHub stars
4.8k
Token cost
~589 tokens
SKILL.md length
159 words
Files
1
Skills in repo
64
Repo updated
First seen
Licence
Custom licence

At a glance

TypeBox patterns for runtime schema validation and JSON Schema generation.

  • Mentioning TypeBox
  • SKILL.md covers Package Names, When to Use What, Standard Schema Boundary and Repo Policy, plus 1 more section
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Standard Schema

What it does

Typebox is an agent skill from EpicenterHQ/epicenter. TypeBox patterns for runtime schema validation and JSON Schema generation. Use when mentioning TypeBox, Standard Schema, or schema-based validation.

Its SKILL.md is about 590 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Frontend & Design, covering Forms and validation. The repository describes itself as: Open-source, local-first apps.

When your agent uses it

  • Mentioning TypeBox
  • Standard Schema
  • Schema-based validation

Example prompts

  • “/typebox”

What it can do on your machine

Read from SKILL.md and the folder at commit f9441c8. 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 typescript).

    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

Typebox loads about 589 tokens when it runs. Until then it costs about 39 tokens; SKILL.md has 159 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~39
When it runs · the whole SKILL.md, loaded when a task matches
~589

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 159 words (~589 tokens).

“Use typebox, not @sinclair/typebox. The @sinclair/typebox package is deprecated.”

— opening of SKILL.md by EpicenterHQ, Custom licence
name
typebox
metadata.author
epicenter
metadata.version
1.0

Read the full SKILL.md on GitHub

Files

Just SKILL.md in .agents/skills/typebox of EpicenterHQ/epicenter.

Open the folder on GitHubat commit f9441c8

Compare with similar skills

Typebox 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.

Typebox compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Typebox this skillEpicenterHQ/epicenter4.8k—~589Automated safety check: PassCustom licence
MCP Developmentcoollabsio/coolify63k1 repos~949Automated safety check: PassMIT
Accessibility Fixeribelick/ui-skills9.4k4 repos~1.2kAutomated safety check: PassMIT
Formik Form PatternsChrisWiles/claude-code-showcase6.1k3 repos~2.1kAutomated safety check: PassNone
Buefy Vue UI Componentsbuefy/buefy9.5k—~8.2kAutomated safety check: PassMIT
Formkitformkit/formkit4.8k—~1.7kAutomated safety check: PassMIT

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  • MCP Development

    coollabsio/coolify

    A skill your agent uses for Laravel MCP development. An agent skill from coollabsio/coolify.

    63k GitHub starsUsed in 1 repo~949 tokens
    Frontend & DesignAuto-check passed

  • Accessibility Fixer

    ibelick/ui-skills

    Audits and fixes HTML accessibility problems such as ARIA labels, keyboard navigation, focus management, contrast and form errors with minimal changes.

    9.4k GitHub starsUsed in 4 repos~1.2k tokens
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    9.5k GitHub stars~8.2k tokensUpdated 29 days ago
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  • Formkit

    formkit/formkit

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More from EpicenterHQ/epicenter

All 64 skills in this repo

  • Agent Instructions

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    Write and maintain repository guidance across AGENTS.md, CLAUDE.md, and .agents/skills.

    4.8k GitHub stars~1.2k tokensUpdated today
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  • Consult Claude

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    Get Claude Code's second opinion on a proposal or implementation.

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  • Better Auth Security Best Practices

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  • Cohesion Over Testability

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    Collapse test-shaped production boundaries while preserving behavior and coverage.

    4.8k GitHub stars~2k tokensUpdated today
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  • Collapse Pass

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    Remove indirection that does not earn its boundary across a diff or package.

    4.8k GitHub stars~2k tokensUpdated today
    Auto-check passed

  • Error Handling

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    Apply Wellcrafted Result patterns to fallible operations and preserve failures at boundaries.

    4.8k GitHub stars~1.4k tokensUpdated today
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Categories

Questions about Typebox

What does Typebox do?

TypeBox patterns for runtime schema validation and JSON Schema generation. Typebox is an agent skill from EpicenterHQ/epicenter. TypeBox patterns for runtime schema validation and JSON Schema generation.

When should I use Typebox?

Typebox fits situations like: mentioning TypeBox; standard Schema; schema-based validation.

How do I install Typebox in Claude Code?

Run `npx skills add EpicenterHQ/epicenter --skill typebox -a claude-code`. Or copy the skill folder (.agents/skills/typebox in EpicenterHQ/epicenter) into .claude/skills/typebox in your project. Claude Code loads it when a task matches its description.

How do I install Typebox in Codex?

Run `npx skills add EpicenterHQ/epicenter --skill typebox -a codex`. Or copy the skill folder (.agents/skills/typebox in EpicenterHQ/epicenter) into .agents/skills/typebox in your project. Codex loads it when a task matches its description.

Can I use Typebox 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 EpicenterHQ/epicenter --skill typebox -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/typebox, .gemini/skills/typebox, .github/skills/typebox and .opencode/skills/typebox in your project.

What does Typebox need to run?

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

Does Typebox 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 Typebox 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 Typebox use?

Typebox 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 Typebox use?

About 589 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.

What are the alternatives to Typebox?

Skills that share tags, products or a category with Typebox: MCP Development (coollabsio/coolify, 63k stars), Accessibility Fixer (ibelick/ui-skills, 9.4k stars), Formik Form Patterns (ChrisWiles/claude-code-showcase, 6.1k stars) and Buefy Vue UI Components (buefy/buefy, 9.5k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Typebox?

EpicenterHQ (a GitHub organization) maintains it in EpicenterHQ/epicenter, which has 4,818 GitHub stars. The repository holds 64 skills in this directory. The repository was last updated on October 7, 2026.

Source: EpicenterHQ/epicenter on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.