slack-block-kit
Build or debug Slack Block Kit payloads for messages, modals, App Home, streaming responses, and Work Object unfurls. Use for block layout, elements, or interaction schemas; not plain Slack text formatting alone.
- Installs
- 157
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/ccheney/robust-skills --skill slack-block-kit- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads slack-block-kit automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
Slack Block Kit
Construct the requested Slack layout or interaction using the receiving surface's schema. The user's explicit instructions take precedence over this skill's guidelines.
Establish the surface
Use the requested content, interaction, target Slack method/surface, and any existing payload as input. Infer the surface from code when possible; ask if a missing choice changes the payload. Ordinary text replies do not require blocks.
| Work | Reference |
|---|---|
| Message, modal, App Home, or interaction lifecycle | SURFACES.md |
| Block choice, fields, limits, surface compatibility | BLOCKS.md |
| Buttons, inputs, menus, pickers | ELEMENTS.md |
| Text objects, options, confirmation dialogs | COMPOSITION.md |
| Structured rich-text nesting and inline elements | RICH-TEXT.md |
| start/append/stop streaming, chunks, SDK differences | STREAMING.md |
| Entity unfurls, flexpanes, edits, comments | WORK-OBJECTS.md |
| Compact block/element/limit lookup | CHEATSHEET.md |
Load only the relevant reference or section. Payload construction does not require a Slack connection. Use the separately installed slack-mrkdwn skill for detailed text-formatting questions when available; the composition and rich-text references here cover the required object shapes independently.
Preserve the payload contract
- Choose text syntax per field:
mrkdwnuses*bold*and<url|label>;plain_textis literal;markdownblocks use standard Markdown;rich_textuses structured elements. - Check surface compatibility: for example, alerts are modal-only and message payloads have different limits from modal/Home views.
- Keep top-level fallback text semantically aligned with blocks when provided. Screen readers and mobile notifications can depend on it.
- Escape untrusted text for its receiving field. Preserve supplied IDs and URLs; do not fabricate real channel, user, trigger, or entity identifiers.
- A modal needs a live trigger and interaction handling; a static preview does not prove the lifecycle works. Follow the current method/SDK contract when streaming schemas disagree.
Deliver valid JSON or integration code for the requested surface, with necessary fallback text and any unresolved runtime inputs. Verify payload structure and relevant limits; test live delivery only when requested or already authorized. Creating a payload does not itself authorize posting it.
Use the Slack Block Kit reference and the exact Web API method/SDK schema for current fields and limits that the bundled reference does not establish.
FAQ
What does the slack-block-kit skill do?
Build or debug Slack Block Kit payloads for messages, modals, App Home, streaming responses, and Work Object unfurls. Use for block layout, elements, or interaction schemas; not plain Slack text formatting alone.
How do I install slack-block-kit?
Run npx skills add https://github.com/ccheney/robust-skills --skill slack-block-kit in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/slack-block-kit/ (personal) or .claude/skills/slack-block-kit/ (project).
Which AI agents can use slack-block-kit?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is slack-block-kit safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains slack-block-kit?
It is published by ccheney in ccheney/robust-skills. It has 157 recorded installs.
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