Slack Notifications

This is your standard Slack integration for Claude, built around the Web API with 14 tools covering messages, channels, users, files, and reactions. It requires a SLACK_BOT_TOKEN and appropriate OAuth scopes. The main win here is context efficiency: about 500 tokens for metadata versus 15,000 if you loaded an MCP server with all 30+ Slack tools upfront. Messaging and file uploads require confirmation, which is sensible. Use this for incident notifications, posting deployment updates, or building workflows that need to ping channels. The documentation includes curl examples for every endpoint, so you can test your token setup independently before letting Claude loose on your workspace.

skills.sh installs: 288
GitHub stars: 45
last updated: Aug 21, 2026

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Install

$ npx -y skills add oimiragieo/agent-studio --skill slack-notifications --agent claude-code

Installs into .claude/skills of the current project.

Files

Mode: Cognitive/Prompt-Driven — No standalone utility script; use via agent context.

Slack Notifications Skill

Overview

This skill provides Slack API operations with progressive disclosure for optimal context usage.

Context Savings: ~90% reduction

MCP Mode: ~15,000 tokens always loaded (30+ tools)
Skill Mode: ~500 tokens metadata + on-demand loading

Requirements

SLACK_BOT_TOKEN environment variable (required)
SLACK_SIGNING_SECRET environment variable (optional, for event verification)
SLACK_APP_TOKEN environment variable (optional, for Socket Mode)

Setting up Slack Bot Token

Create a Slack App at https://api.slack.com/apps
Navigate to "OAuth & Permissions"
Add required bot token scopes:
- chat:write - Send messages
- channels:read - List channels
- channels:history - Read channel history
- users:read - List users
- files:write - Upload files
- reactions:write - Add reactions
Install app to workspace
Copy "Bot User OAuth Token" to SLACK_BOT_TOKEN environment variable