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block-kit

Create structured Slack replies with sections, tables, buttons, and selection menus so people can review results and choose next steps. Also author and validate Block Kit JSON, Slack's format for rich app interfaces.

OriginalShow the original description

Use proactively for structured or interactive Slack replies, and when asked to author or validate native Slack Block Kit JSON.

Works withSlack
AI rating80/ 100See how to install

Good for

  • Present a Slack status report in structured sections or a table
  • Add confirmation buttons to a Slack reply
  • Let users choose the next action from a selection menu
  • Author and validate Block Kit JSON for a Slack app

Overview

What it does

Organizes Slack replies with titled text, tables, charts, buttons, and selection menus. It puts the result first and separates supporting information so the message is easier to read. Buttons can represent conversational choices or open external links, connecting a selection to the next task. For Slack apps, it also creates and validates Block Kit JSON, which defines interface components.

When it helps

Use it to share progress or comparison results in Slack, request confirmation, or let people choose what to do next. Short replies and casual conversation use ordinary text. Layouts are added when structure or interaction helps people use the information.

Example requests

  • “Organize this progress report with headings and a table, then send it to Slack.”
  • “Add a confirmation button and a menu for choosing the next task.”
  • “Create and validate Block Kit JSON for a Slack app.”

Notes

Requires Slack channel configuration and the message tool. Replies pass a presentation, which the Slack plugin converts to Block Kit. Available components depend on the current tool specification. Raw Block Kit JSON cannot be passed to presentation. Include fallback text that preserves the meaning when structured display is unavailable.

This overview was written by AI (OpenAI Codex) from the public SKILL.md. Check the original below for the exact behavior.

Objective evaluation

AI rated this skill on four points using only the contents of its SKILL.md. Stars and popularity are not taken into account.

Clear instructionsIs it clear when to use it and what it does?
AGoodIt distinguishes situations suited to structured replies from those suited to plain text.
Concrete stepsAre steps, inputs, outputs, and examples spelled out?
AGoodIt specifies message sending parameters, fallback text, button behavior, and the JSON validation workflow.
SafetyAre sending data, deleting files, and running commands disclosed?
BPartly lackingIt sends messages to Slack through message, but provides no procedure for checking the destination or published content.
Easy setupDoes it need few tools or API keys, and are they documented?
BPartly lackingIt requires channels.slack and message, but does not explain how to configure them.

The total counts each point as A = 25, B = 15, C = 5. Rated by AI (OpenAI Codex) as of Oct 19, 2026. Treat it as a guide and read the original before installing.

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Files included (3)

  • SKILL.md2.4 KB
  • references/official-block-kit.md15.3 KB
  • references/official-common-patterns.md11.1 KB

SKILL.md (original)

Review the instructions the agent will receive before you install.

Slack Block Kit

Make useful Slack replies feel native. When structure or one-click follow-up improves the outcome, send a rich message without waiting for the user to ask for Block Kit.

Choose the surface

Use a presentation when the reply has at least one of these shapes:

  • a decision, confirmation, or next action that belongs on buttons or a select
  • a status, comparison, report, or plan that scans better as titled sections, a table, or a chart
  • important context that should be visually separated from the primary result

Use plain text for short answers and casual conversation where structure adds no value.

Send the result

For a reply in Slack, call the message tool with action: "send" and a portable presentation. The Slack plugin renders it as native Block Kit. Use the exact schema exposed by the current tool; supported block types can include text, context, divider, buttons, select, chart, and table.

  • Put the outcome first. Keep titles, labels, and context concise.
  • Give interactive controls real follow-up semantics. Use typed callback actions for conversational choices and url for an external destination. Do not use generic command actions for Slack controls; Slack renders them as text fallback rather than clickable controls.
  • Include a useful message fallback that preserves the meaning without the rich layout.
  • After the visible send succeeds, do not repeat the same content in the final response.

A control is complete only when its value is self-contained enough for the next agent turn to understand and act on. When an interaction returns, acknowledge the choice visibly and continue the requested workflow.

Native Block Kit authoring

When the user is building a Slack app or explicitly requests raw Block Kit JSON, read the adapted official Block Kit guide in full. For common message, modal, and App Home layouts, also read the official patterns.

Follow the adapted guide's live-documentation and blocks.validate workflow for native JSON. Do not pass native Slack blocks to OpenClaw's presentation field; the plugin owns that conversion.

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