Official agent skill

Sanity Tsdown Config

Configure Sanity libraries with @sanity/tsdown-config, including its publishing defaults, React transforms, CSS extraction, TSDoc checks, and advanced tsdown composition.

OfficialMITAuto-check passedFrontend & Design

Install Sanity Tsdown Config

skills CLI

$ npx skills add sanity-io/sanity --skill sanity-tsdown-config -a claude-code

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

GitHub CLI

$ gh skill install sanity-io/sanity sanity-tsdown-config --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/sanity-io/sanity.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/sanity-tsdown-config .claude/skills/sanity-tsdown-config && 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/

Paste into Claude Code

Install the "sanity-tsdown-config" agent skill from https://github.com/sanity-io/sanity/tree/main/.agents/skills/sanity-tsdown-config into .claude/skills/sanity-tsdown-config/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sanity-tsdown-config", 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

$skill-installer install https://github.com/sanity-io/sanity/tree/main/.agents/skills/sanity-tsdown-config

Type 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.

skills CLI

$ npx skills add sanity-io/sanity --skill sanity-tsdown-config -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install sanity-io/sanity sanity-tsdown-config --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/sanity-io/sanity.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/sanity-tsdown-config .agents/skills/sanity-tsdown-config && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "sanity-tsdown-config" agent skill from https://github.com/sanity-io/sanity/tree/main/.agents/skills/sanity-tsdown-config into .agents/skills/sanity-tsdown-config/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sanity-tsdown-config", 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.

skills CLI

$ npx skills add sanity-io/sanity --skill sanity-tsdown-config -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install sanity-io/sanity sanity-tsdown-config --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/sanity-io/sanity.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/sanity-tsdown-config .cursor/skills/sanity-tsdown-config && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "sanity-tsdown-config" agent skill from https://github.com/sanity-io/sanity/tree/main/.agents/skills/sanity-tsdown-config into .cursor/skills/sanity-tsdown-config/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sanity-tsdown-config", 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

$ gemini skills install https://github.com/sanity-io/sanity.git --path .agents/skills/sanity-tsdown-config

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add sanity-io/sanity --skill sanity-tsdown-config -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install sanity-io/sanity sanity-tsdown-config --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/sanity-io/sanity.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/sanity-tsdown-config .gemini/skills/sanity-tsdown-config && rm -rf skills-src

Use ~/.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/

Paste into Gemini CLI

Install the "sanity-tsdown-config" agent skill from https://github.com/sanity-io/sanity/tree/main/.agents/skills/sanity-tsdown-config into .gemini/skills/sanity-tsdown-config/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sanity-tsdown-config", 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.

GitHub CLI

$ gh skill install sanity-io/sanity sanity-tsdown-config

Installs 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).

skills CLI

$ npx skills add sanity-io/sanity --skill sanity-tsdown-config -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/sanity-io/sanity.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/sanity-tsdown-config .github/skills/sanity-tsdown-config && rm -rf skills-src

Use ~/.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/

Paste into GitHub Copilot

Install the "sanity-tsdown-config" agent skill from https://github.com/sanity-io/sanity/tree/main/.agents/skills/sanity-tsdown-config into .github/skills/sanity-tsdown-config/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sanity-tsdown-config", 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.

skills CLI

$ npx skills add sanity-io/sanity --skill sanity-tsdown-config -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install sanity-io/sanity sanity-tsdown-config --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/sanity-io/sanity.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/sanity-tsdown-config .opencode/skills/sanity-tsdown-config && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "sanity-tsdown-config" agent skill from https://github.com/sanity-io/sanity/tree/main/.agents/skills/sanity-tsdown-config into .opencode/skills/sanity-tsdown-config/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sanity-tsdown-config", 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: sanity-tsdown-config
GitHub stars: 6.4k
Token cost: ~2.3k tokens
SKILL.md length: 808 words
Files: 1
Skills in repo: 34
Repo updated: Oct 9, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Configure Sanity libraries with @sanity/tsdown-config, including its publishing defaults, React transforms, CSS extraction, TSDoc checks, and advanced tsdown composition.

Editing tsdown.config.ts for a Sanity package
SKILL.md covers Install and configure, Know the defaults, Use PackageOptions first and Opt-in features, plus 3 more sections
Calls pnpm and npx
Deciding between PackageOptions and stock tsdown options

What it does

Sanity Tsdown Config is an agent skill from sanity-io/sanity, published by the product's own GitHub organization. Configure Sanity libraries with @sanity/tsdown-config, including its publishing defaults, React transforms, CSS extraction, TSDoc checks, and advanced tsdown composition. Use when creating or editing tsdown.config.ts for a Sanity package, or when deciding between PackageOptions and stock tsdown options.

Its SKILL.md is about 2.3k 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. It works with React. The repository describes itself as: Sanity Studio – Rapidly configure content workspaces powered by structured content. The licence is MIT.

When your agent uses it

Editing tsdown.config.ts for a Sanity package
Deciding between PackageOptions and stock tsdown options

Example prompts

“/sanity-tsdown-config”

Requirements

Node.js

What it can do on your machine

Read from SKILL.md and the folder at commit efa15fb. 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
Shell commands in SKILL.md call:
- pnpm
- npx
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use pnpm and npx, which can reach the network depending on how they are called.
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

Sanity Tsdown Config loads about 2.3k tokens when it runs. Until then it costs about 81 tokens; SKILL.md has 808 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~81
When it runs · the whole SKILL.md, loaded when a task matches: ~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 sanity-io/sanity at commit efa15fb, republished under its MIT licence (© sanity-io). 808 words, ~2,327 tokens.

Download SKILL.mdSave it as .claude/skills/sanity-tsdown-config/SKILL.md (or your agent's skills folder).

name: sanity-tsdown-config
description: Configure Sanity libraries with @sanity/tsdown-config, including its publishing defaults, React transforms, CSS extraction, TSDoc checks, and advanced tsdown composition. Use when creating or editing tsdown.config.ts for a Sanity package, or when deciding between PackageOptions and stock tsdown options.
license: MIT
metadata.author: sanity-io
metadata.version: 0.28

`@sanity/tsdown-config`

Use this skill for Sanity's opinionated wrapper around tsdown. Use the separately installable tsdown skill for generic tsdown concepts and options:

npx skills add rolldown/tsdown --skill tsdown

This skill owns the wrapper's defaults and integration points. Do not replace the wrapper with a raw tsdown config unless the package explicitly does not want Sanity's library conventions.

Install and configure

@sanity/tsdown-config 0.28.x requires Node.js ^22.18.0 || ^24.11.0 || >=26.0.0.

pnpm add -D @sanity/tsdown-config tsdown

Create tsdown.config.ts:

import {defineConfig} from '@sanity/tsdown-config'

export default defineConfig({tsconfig: 'tsconfig.dist.json'})

Prefer a distribution tsconfig that includes only publishable source. Let package metadata drive declaration generation: tsdown enables dts when package.json has a types field or a types condition in exports.

Build and watch with tsdown:

pnpm tsdown
pnpm tsdown --watch

Know the defaults

Do not restate these unless intentionally overriding them:

Behavior	`@sanity/tsdown-config` default
Platform	`'neutral'`; also externalizes `node:` built-ins and restores `module`/`main` resolution for inlined dependencies without exports
Format	`'esm'`
Source maps	`true` (stock tsdown defaults to `false`)
Package exports	Always generated; in pnpm projects, `devExports: true` points local exports at source and puts built exports in `publishConfig`
Package validation	`publint: true`
Dependency subpaths	`deps.resolveDepSubpath: true`
Circular dependencies	`checks.circularDependency: true`; declaration-only cycles are suppressed, runtime cycles still warn
Minification	Compression/dead-code elimination only; no mangling or whitespace codegen; function and class names are preserved
Report	`{gzip: false}`
Cleaning	Stock tsdown default: clean `outDir` (`dist`)
Output directory	Stock tsdown default: `dist`
Chunk names	Keep tsdown's hashed default

The neutral platform is deliberate for isomorphic packages. Do not switch to 'node' merely because some source imports Node APIs: 'node' can emit module-scope CommonJS interop that crashes browser bundles. Set a specific platform only when the package is truly runtime-specific.

The exports feature rewrites package.json on every build, including when CI=true. Review the resulting local exports and publishConfig.exports.

Use `PackageOptions` first

The wrapper directly exposes common package options: tsconfig, entry, format, dts, define, target, outDir, clean, platform, cwd, exports, sourcemap, deps, css, vanillaExtract, reactCompiler, styledComponents, bundleAnalyzer, tsdoc, and suppressWarnings.

Add only what the package needs:

import {defineConfig} from '@sanity/tsdown-config'

export default defineConfig({
  tsconfig: 'tsconfig.dist.json',
  deps: {neverBundle: [/^some-package(\/|$)/]},
  tsdoc: true,
})

Under the neutral platform, user deps.neverBundle entries are appended to the built-in /^node:/ external rather than replacing it. Strings use tsdown matching semantics; use a regular expression when a dependency's subpaths must also match.

Opt-in features

React Compiler

The default implementation is Oxc and requires:

pnpm add -D oxc-transform-react

export default defineConfig({
  tsconfig: 'tsconfig.dist.json',
  reactCompiler: true,
})

Use reactCompiler: {target: '18'} for compiler options. Choose the Babel reference implementation only for features the Oxc port does not support, such as a custom jsxImportSource, a logger, or function-valued sources:

pnpm add -D @rolldown/plugin-babel @babel/core babel-plugin-react-compiler

reactCompiler: {target: '19', transform: 'babel'}

For an isomorphic component library, reactCompiler: {target: '19', reactServer: true} emits an additional uncompiled react-server variant and adds that export condition. This is experimental, creates two module instances across conditions, and is unnecessary for client-only packages that ship 'use client'.

styled-components

Set styledComponents: true to add display names and stable component IDs and to minify tagged CSS. This uses Oxc's native transform; do not install babel-plugin-styled-components.

Show full SKILL.md (356 more words)Show less

CSS and vanilla-extract

vanillaExtract: true extracts .css.ts files to dist/bundle.css.
css: {...} enables plain CSS, CSS modules, preprocessors, and PostCSS through the optional @tsdown/css peer. Install it with pnpm add -D @tsdown/css.
Both default CSS minification to true, use Sanity browser targets when the JS target has no browsers, and publish a conditional CSS export with a no-op Node shim.
Both can be enabled together: vanilla-extract uses bundle.css; css uses style.css.
Add published CSS to package.json#sideEffects, for example "sideEffects": ["*.css"].

Install @vanilla-extract/css when authoring .css.ts files. It is separate from the tsdown plugin bundled by this wrapper.

Bundle analysis

Keep analysis opt-in:

bundleAnalyzer: process.env.ENABLE_BUNDLE_ANALYZER === 'true'

true emits the LLM-friendly dist/analyze-data.md. Exclude the report from package.json#files; it is not a publishable artifact.

TSDoc

Set tsdoc: true to run API Extractor after the build for TSDoc syntax and release-tag checks. This is off by default. It validates emitted entry declarations; it is not a replacement for TypeScript type-checking.

Reach stock tsdown through `mergeConfig`

PackageOptions is intentionally smaller than UserConfig. For a stock tsdown option it does not expose, await the Sanity config and merge over it:

import {defineConfig} from '@sanity/tsdown-config'
import {mergeConfig} from 'tsdown'

export default mergeConfig(await defineConfig({tsconfig: 'tsconfig.dist.json'}), {
  hash: false,
})

Use this pattern for advanced tsdown or Rolldown behavior, including overriding checks.circularDependency or the wrapper's compress-only minify. mergeConfig deep-merges plain objects, appends plugins, and replaces scalars and non-plugin arrays.

With the @sanity/tsconfig/isolated-declarations preset, annotate the export to avoid a non-portable inferred type:

import {defineConfig} from '@sanity/tsdown-config'
import type {UserConfig} from 'tsdown'

export default defineConfig() satisfies Promise<UserConfig>

Use Promise<UserConfig[]> when reactCompiler.reactServer is enabled.

Do not add by default

Do not enable exe; this wrapper targets publishable libraries, not standalone executables.
Do not enable devtools; it is not part of the wrapper's package API or defaults.
Do not replace compress-only output with full minification. Consumer production builds minify dependencies again, while published names and readable output improve debugging.
Do not design around Storybook. Storybook is an app/demo concern, not this library build contract.
Do not disable exports, publint, circular-dependency checks, or source maps without a concrete package requirement.

Choose the right Sanity tool

Use @sanity/pkg-utils and pkg build when a conventional Sanity package already describes its entries and runtime conditions in package.json#exports. Use this wrapper directly when the build needs arbitrary tsdown options, multiple configs, reactCompiler.reactServer, or behavior outside pkg-utils' package.config.ts surface.

Files

Just SKILL.md in .agents/skills/sanity-tsdown-config of sanity-io/sanity.

Open the folder on GitHubat commit efa15fb

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders. This page covers the copy in sanity-io/sanity, which our catalogue first saw on October 7, 2026.

sanity-io/ui.agents/skills/sanity-tsdown-config

Compare with similar skills

Sanity Tsdown Config 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.

Sanity Tsdown Config compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Sanity Tsdown Config this skillsanity-io/sanity	6.4k	—	~2.3k	Automated safety check: Pass	MIT	yesterday
Web Artifacts Builderanthropics/skills	180k	40 repos	~769	Automated safety check: Pass	Apache-2.0	yesterday
React Doctormakeplane/plane	61k	12 repos	~657	Automated safety check: Pass	AGPL-3.0	yesterday
React Router Developmentremix-run/react-router	57k	1 repos	~1.5k	Automated safety check: Pass	MIT	yesterday
React UI State PatternsChrisWiles/claude-code-showcase	6.1k	8 repos	~1.6k	Automated safety check: Pass	None	9 mo ago
GSAP Core Animationgreensock/gsap-skills	16k	3 repos	~3.7k	Automated safety check: Pass	MIT	2 mo ago

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Questions about Sanity Tsdown Config

What does Sanity Tsdown Config do?

Configure Sanity libraries with @sanity/tsdown-config, including its publishing defaults, React transforms, CSS extraction, TSDoc checks, and advanced tsdown composition. Sanity Tsdown Config is an agent skill from sanity-io/sanity, published by the product's own GitHub organization. Configure Sanity libraries with @sanity/tsdown-config, including its publishing defaults, React transforms, CSS extraction, TSDoc checks, and advanced tsdown composition.

When should I use Sanity Tsdown Config?

Sanity Tsdown Config fits situations like: editing tsdown.config.ts for a Sanity package; deciding between PackageOptions and stock tsdown options.

How do I install Sanity Tsdown Config in Claude Code?

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

How do I install Sanity Tsdown Config in Codex?

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

Can I use Sanity Tsdown Config 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 sanity-io/sanity --skill sanity-tsdown-config -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/sanity-tsdown-config, .gemini/skills/sanity-tsdown-config, .github/skills/sanity-tsdown-config and .opencode/skills/sanity-tsdown-config in your project.

What does Sanity Tsdown Config need to run?

Going by SKILL.md and its folder, Sanity Tsdown Config needs the command-line tools its instructions call (pnpm and npx). Our summary lists: Node.js.

Does Sanity Tsdown Config access the network?

SKILL.md contains no URLs. Its commands use npx, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Sanity Tsdown Config 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 Sanity Tsdown Config use?

Sanity Tsdown Config 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 Sanity Tsdown Config use?

About 2.3k tokens (SKILL.md is roughly 9.3k 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 Sanity Tsdown Config?

Skills that share tags, products or a category with Sanity Tsdown Config: Web Artifacts Builder (anthropics/skills, 180k stars), React Doctor (makeplane/plane, 61k stars), React Router Development (remix-run/react-router, 57k stars) and React UI State Patterns (ChrisWiles/claude-code-showcase, 6.1k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Sanity Tsdown Config?

sanity-io (a GitHub organization, an official publisher) maintains it in sanity-io/sanity, which has 6,352 GitHub stars. The repository holds 34 skills in this directory. The repository was last updated on October 9, 2026.

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

Install Sanity Tsdown Config

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

@sanity/tsdown-config

Install and configure

Know the defaults

Use PackageOptions first

Opt-in features

React Compiler

styled-components

CSS and vanilla-extract

Bundle analysis

TSDoc

Reach stock tsdown through mergeConfig

Do not add by default

Choose the right Sanity tool

Files

Used in 1 other repository

Compare with similar skills

Similar skills

More from sanity-io/sanity

Related

Questions about Sanity Tsdown Config

`@sanity/tsdown-config`

Use `PackageOptions` first

Reach stock tsdown through `mergeConfig`