Data Client Schema

What it does

When your agent uses it

• Resource()/RestEndpoint schema
• Mutable lists/maps (push/unshift/assign/remove/move)
• Polymorphic/discriminated types
• Memoized selectors / derived data

Example prompts

• “/data-client-schema”

Workflow steps

8 steps, taken from the step headings in SKILL.md.

1. 1Defining Schemas
2. 2Entity best practices
3. 3Entity lifecycle methods
4. 4Union Types (Polymorphic Schemas)
5. 5Collections (Mutable Lists & Maps)
6. 6Supplementary Endpoints (enrich existing entities)
7. 7Best Practices & Notes
8. 8Common Mistakes to Avoid

What it can do on your machine

Read from SKILL.md and the folder at commit 02c0932. 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

  Links to these hosts (documentation or services it may open):

  • dataclient.io

  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

Data Client Schema loads about 2.3k tokens when it runs, and up to ~79k if it reads all its reference files. Until then it costs about 201 tokens; SKILL.md has 750 words of instructions outside code blocks.

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

~201

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

~2.3k

With references · SKILL.md plus every file in references/, read only if the agent opens them

~79k

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 reactive/data-client at commit 02c0932, republished under its Apache-2.0 licence (© reactive). 750 words, ~2,332 tokens.

name

data-client-schema

description

Model data with @data-client schemas (Entity, EntityMixin, Collection, Union, Query, Values, All, Invalidate, Lazy, Scalar) for atomic, consistent, referentially-equal async data via normalization, identity-based caching, and a single source of truth. Use when defining or editing pk, static schema, resource()/RestEndpoint schema, mutable lists/maps (push/unshift/assign/remove/move), polymorphic/discriminated types, memoized selectors / derived data, partial/supplementary entities, relational/nested/joined data, optimistic updates, or cache invalidation across @data-client/rest, /endpoint, /graphql, or /normalizr. Apply proactively when discussing data models, remote data shape, caching, normalization, identity, joins, polymorphism, mutable collections, or store consistency.

license

Apache 2.0

import { Union } from '@data-client/rest'; // also available from @data-client/endpoint

export abstract class Event extends Entity {
  type: EventType = 'Issue';    // discriminator field is shared
  /* ... */
}
export class PullRequestEvent extends Event { /* ... */ }
export class IssuesEvent extends Event { /* ... */ }

export const EventResource = resource({
  path: '/users/:login/events/public/:id',
  schema: new Union(
    {
      PullRequestEvent,
      IssuesEvent,
      // ...other event types...
    },
    'type', // discriminator field
  ),
});

const userTodos = new Collection([Todo], {
  argsKey: ({ userId }: { userId?: string }) => ({ userId }),
  nestKey: (parent: User) => ({ userId: parent.id }),
});

new Collection([Todo], { nonFilterArgumentKeys: /orderBy|sortDir/ })

© reactive, Apache-2.0. 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 41 other files (references) in .agents/skills/data-client-schema of reactive/data-client.

• SKILL.md
• references.json
• references/All.md
• references/All.vue.md
• references/Array.md
• references/Array.vue.md
• references/Collection.md
• references/Collection.vue.md
• references/Entity.md
• references/Entity.vue.md
• references/EntityMixin.md
• references/EntityMixin.vue.md
• references/Invalidate.md
• references/Invalidate.vue.md
• references/Lazy.md
• references/Lazy.vue.md
• references/Object.md
• references/Object.vue.md
• references/Query.md
• references/Query.vue.md
• … and 22 more

Open the folder on GitHubat commit 02c0932