Why do I need to use 'bash -c' for environment variables?

Due to a specific behavior in Claude Code, environment variables can be cleared when using pipes directly; wrapping the command in 'bash -c' ensures the SLACK_WEBHOOK_URL is correctly expanded.

Does this skill support Slack's Block Kit?

Yes, you can send complex, rich-layout messages by defining the 'blocks' field in your JSON payload.

Do I need a Slack Bot token to use this skill?

No, this skill uses Incoming Webhooks, which only require a Webhook URL rather than a full OAuth or Bot Token setup.

Can I send messages to multiple channels?

A single webhook URL is tied to one specific channel. To post to multiple channels, you would need a unique webhook URL for each one.

Can this skill read messages from Slack?

No, Incoming Webhooks are restricted to one-way outgoing communication. To read messages or interact with threads, a full Slack App with Bot permissions is required.

Slack Incoming Webhooks

Name: Slack Incoming Webhooks
Author: vm0-ai

byvm0-ai

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Collaboration Tools

Sends real-time notifications and structured messages to Slack channels using simple Incoming Webhooks.

About

The Slack Incoming Webhook skill enables Claude to programmatically send messages, alerts, and structured data to specific Slack channels without the complexity of OAuth or full bot registration. It supports Markdown-style formatting, interactive Block Kit layouts, and automated status updates, making it an ideal choice for developers who need quick, reliable one-way communication for CI/CD pipelines, system alerts, or project status reporting directly from their terminal.

Key Features

18 GitHub stars
Simple one-way messaging to specific Slack channels
Automated shell escaping for safe message delivery
Markdown formatting for bold, italic, and hyperlinked text
Full support for Slack's Block Kit for rich, interactive layouts
Zero OAuth configuration required using secret webhook URLs

Use Cases

Broadcasting project status updates and automated reports to team stakeholders
Automating deployment success or failure notifications to a development channel
Sending real-time system health alerts and monitoring updates to DevOps teams

About

Key Features

18 GitHub stars
Simple one-way messaging to specific Slack channels
Automated shell escaping for safe message delivery
Markdown formatting for bold, italic, and hyperlinked text
Full support for Slack's Block Kit for rich, interactive layouts
Zero OAuth configuration required using secret webhook URLs

Use Cases

Broadcasting project status updates and automated reports to team stakeholders
Automating deployment success or failure notifications to a development channel
Sending real-time system health alerts and monitoring updates to DevOps teams