---
name: block-kit
slug: slack-block-kit
score: 53
rubric: 1.0
provenance: verified-org
publisher: Slack Technologies
license: MIT
capability: read-write
canonical: https://top-agent-skills.com/skill/slack-block-kit
---

# block-kit

Slack's own Block Kit skill — and the rare vendor skill that needs no token, because it validates against Slack's public API.

## Install

### Claude Code

```bash
/plugin marketplace add slackapi/slack-skills-plugin
```

## Best for

Composing Slack messages, modals and Home tabs where hand-written Block Kit JSON is the thing that keeps breaking — it validates output against Slack rather than guessing.

## Not ideal for

Actually sending the message. It generates and validates layouts; delivery is the sibling slack-api skill, which does need a token.

## About

Help developers build and validate Block Kit layouts for Slack messages, modals, and Home tabs. Provides authoritative block references and validates with the blocks.validate API. Use whenever the developer wants to compose Slack message layouts, build modals, forms or dialogs, design Home tab interfaces, create interactive messages with buttons or menus, modify existing Block Kit JSON, or asks about any Slack UI component. Also trigger on "blocks", "Block Kit Builder", or pasted JSON containing block structures.

## Compatibility

claude-code

## Metadata

- Categories: email-messaging, apis-integrations
- Surfaces: claude-code
- Tags: Slack, Block Kit, Modals
- Setup time: 2 min
- Complexity: Low
- Last update: 2026-08-12
- Verified: —
- Source: https://github.com/slackapi/slack-skills-plugin/tree/main/skills/block-kit
- Docs: https://github.com/slackapi/slack-skills-plugin/blob/main/skills/block-kit/SKILL.md

---

_Indexed by Top Agent Skills. Score breakdown: https://top-agent-skills.com/about/methodology_