Sanity Default Plugins

What it does

When your agent uses it

• Reviewing plugins under packages/sanity/src/core
• Especially plugins added through resolveDefaultPlugins
• Studio.components middleware

Example prompts

• “/sanity-default-plugins”

Workflow steps

7 steps, taken from the first numbered list in SKILL.md.

1. 1Import the plugin and its name constant.
2. 2Add the plugin to defaultPlugins(options) in the desired composition order.
3. 3If gated, add a plugin.name === FEATURE_NAME branch in getDefaultPlugins.
4. 4Add any required options to DefaultPluginsWorkspaceOptions in types.ts.
5. 5In getDefaultPluginsOptions, build default plugin options directly from workspace config defaults and spreads. Do not call config property…
6. 6Update packages/sanity/src/core/config/tests/resolveConfig.test.ts with focused default plugin tests
7. 7Add ordering coverage when plugin order affects UI composition.

What it can do on your machine

Read from SKILL.md and the folder at commit 73980e6. 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

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  No URLs in SKILL.md. Its commands use pnpm, 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 Default Plugins loads about 1.1k tokens when it runs. Until then it costs about 69 tokens; SKILL.md has 329 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~69

When it runs · the whole SKILL.md, loaded when a task matches

~1.1k

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

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 73980e6, republished under its MIT licence (© sanity-io). 329 words, ~1,091 tokens.

name

sanity-default-plugins

description

Create and wire Sanity core plugins using the monorepo's default plugin conventions. Use when adding, modifying, or reviewing plugins under packages/sanity/src/core, especially plugins added through resolveDefaultPlugins or studio.components middleware.

import {definePlugin} from '../../config/definePlugin'

export const FEATURE_NAME = 'sanity/feature'

export const feature = definePlugin({
  name: FEATURE_NAME,
  studio: {
    components: {
      layout: FeatureStudioLayout,
    },
  },
  i18n: {
    bundles: [featureUsEnglishLocaleBundle],
  },
})

import {type LocaleResourceBundle} from '../../i18n'

export const featureNamespace: 'feature' = 'feature'

export const featureUsEnglishLocaleBundle: LocaleResourceBundle = {
  locale: 'en-US',
  namespace: featureNamespace,
  resources: () => import('./resources'),
}

export type {FeatureLocaleResourceKeys} from './resources'

const featureLocaleStrings = {
  'action.example': 'Example',
}

export type FeatureLocaleResourceKeys = keyof typeof featureLocaleStrings

export default featureLocaleStrings

import {featureUsEnglishLocaleBundle} from '../i18n'

export const feature = definePlugin({
  name: FEATURE_NAME,
  i18n: {
    bundles: [featureUsEnglishLocaleBundle],
  },
})

variants: {
  enabled: false,
  ...workspace.beta?.variants,
}

pnpm vitest run --project=sanity packages/sanity/src/core/config/__tests__/resolveConfig.test.ts

© sanity-io, 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 .agents/skills/sanity-default-plugins of sanity-io/sanity.

Open the folder on GitHubat commit 73980e6