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Designing stable APIs and interfaces v1.0.0

Use this resource to design a stable API or a contract between modules

New

  • 365 downloads
  • 249 likes
  • 202 saves

Free

Install with the CLI

In a terminal, from the folder you want:

npx --yes palatekit@latest install stable-api-contract-design

With no option, the skill goes to ~/.agents/skills/; add --agent claude-code (or codex, cursor…) to target an agent.

First time: connect the CLI with

npx --yes palatekit@latest login

The agent defines the contract of a REST or GraphQL API, a module boundary or component props before writing code. It applies Hyrum's Law, consistent errors, validation at boundaries and an idempotency key. You get an interface that is hard to misuse.

Mostly picked by

Updated November 2, 2026

Card for the “Designing stable APIs and interfaces” skill

Details

Works in
Install guides
Generates with
Your agent's model
Licence
MIT

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What you get

  • SKILL.md: principles, contract first and error semantics
  • SKILL.md: predictable naming, additions over changes and idempotency

Good fit for

  • You are creating the first endpoints of an application
  • Two teams must agree on a contract between frontend and backend

Not for

    Tags

    • api
    • contract
    • rest
    • graphql

    About

    You say

    “Define the REST contract for the order endpoint: errors, validation and idempotency key.”

    Card for the “Designing stable APIs and interfaces” skill

    Skill published by addyosmani under the MIT license, delivered in its original version.

    Show more

    How to use it

    1. Install the skill in your agent's skills folder
    2. Ask your agent to design a stable API or a contract between modules
    3. Review and adjust the result

    Content preview

    Files

    • LICENSE1 KB
    • NOTICE-PALATEKIT.md0.5 KB
    • SKILL.md14.5 KB

    Origin and licence

    Listed unmodified

    Author
    addyosmani
    Source
    github.com/addyosmani/agent-skills/tree/aeac41d4d005999432bb7312f7ff06383a91d59d/skills/api-and-interface-design
    Licence
    MIT

    Notice

    « api-and-interface-design » (addyosmani, MIT) livré dans sa version d'origine : fiche en français et en anglais par PalateKit.

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