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Design Block Kit messages and modals v1.0.0

Use this resource to design and validate Block Kit JSON for a message, modal or Home tab

New

  • 538 downloads
  • 216 likes
  • 193 saves

Free

Install with the CLI

In a terminal, from the folder you want:

npx --yes palatekit@latest install slack-block-kit-builder

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 picks the surface, plans the layout and generates the Block Kit JSON. It validates it with the blocks.validate method before delivering it. Block types and their schemas are read from the live Slack documentation.

Mostly picked by

Updated November 2, 2026

Card for the “Design Block Kit messages and modals” skill

Details

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

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What you get

  • SKILL.md: surface choice, generation and validation steps
  • references/modal-design.md: modal design
  • references/home-tab-design.md: Home tab design

Good fit for

  • You want a form modal for a Slack request
  • You have Block Kit JSON that fails validation

Not for

    Tags

    • slack
    • block kit
    • modal
    • interface

    About

    You say

    “Design a Slack modal for leave requests with two date fields and an approval menu.”

    Card for the “Design Block Kit messages and modals” skill

    Skill published by slackapi 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 and validate Block Kit JSON for a message, modal or Home tab
    3. Review and adjust the result

    Content preview

    Files

    • LICENSE1.1 KB
    • NOTICE-PALATEKIT.md0.5 KB
    • references/agent-progress-design.md10.8 KB
    • references/common-patterns.md15.9 KB
    • references/data-display-design.md7.5 KB
    • references/design-principles.md12.5 KB
    • references/home-tab-design.md4.8 KB
    • references/human-in-the-loop.md13.6 KB
    • references/modal-design.md9.6 KB
    • SKILL.md19.2 KB

    Origin and licence

    Listed unmodified

    Author
    slackapi
    Source
    github.com/slackapi/slack-skills-plugin/tree/bc8345a60de677ad06d1d6a885953ae5320fbc44/skills/block-kit
    Licence
    MIT

    Notice

    « block-kit » (slackapi, MIT) livré dans sa version d'origine : fiche en français et en anglais par PalateKit.

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