# slack-bot

Sends messages and Block Kit announcements to Slack channels via incoming webhooks or the Bot API.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · 424 installs · ★ 721
- Author: OpenClaudia
- License: MIT · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/OpenClaudia/openclaudia-skills/tree/HEAD/skills/slack-bot/SKILL.md
- Updated: 2026-10-21
- HTML: https://affpapa.org/en/nevibecode/skills/slack-bot

## What it does

This skill gives the agent patterns to post to Slack channels using `curl` commands over Bash. It supports two operating modes: incoming webhooks for posting to a single preconfigured channel, and the Slack Web API using a bot token (`SLACK_BOT_TOKEN`).

With Web API mode, the agent can reply directly to threads using `thread_ts`, broadcast thread replies to the channel, and update previous posts via `chat.update`. Block Kit structures format announcements and metrics dashboards with headers, dividers, and action buttons.

A single webhook cannot read channels or reply to threads on its own, so choosing the bot token route avoids running into channel limitations later. Credentials must be stored in `.env`, `.env.local`, or `~/.claude/.env.global`.

## Requirements
- Works with: Slack

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add OpenClaudia/openclaudia-skills --skill slack-bot -a claude-code
```

2. **Manually: put the files in place**
- File: `~/.claude/skills/slack-bot/SKILL.md` — Copy the whole skill folder; for one project use .claude/skills/slack-bot/

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add OpenClaudia/openclaudia-skills --skill slack-bot -a codex
```

2. **Manually: put the files in place**
- File: `.agents/skills/slack-bot/SKILL.md` — For all projects use ~/.agents/skills/

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add OpenClaudia/openclaudia-skills --skill slack-bot -a cursor
```

2. **Manually: put the files in place**
- File: `.cursor/skills/slack-bot/SKILL.md` — Cursor also reads .agents/skills/ and .claude/skills/

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install OpenClaudia/openclaudia-skills slack-bot
```

2. **Manually: put the files in place**
- File: `.github/skills/slack-bot/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add OpenClaudia/openclaudia-skills --skill slack-bot -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/OpenClaudia/openclaudia-skills --path skills/slack-bot
```

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/skills/slack-bot/SKILL.md` — The legacy .windsurf/skills/ path still works

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add OpenClaudia/openclaudia-skills --skill slack-bot -a opencode
```

### Claude.ai

**Claude.ai**
- Zip the folder and upload it in Settings → Capabilities → Skills

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/OpenClaudia/openclaudia-skills/tree/HEAD/skills/slack-bot/SKILL.md

## When to use it
- post formatted announcements to Slack channels using Block Kit
- reply inside specific conversation threads using thread_ts
- update existing channel messages via the Slack Web API
- send notifications through incoming webhooks without OAuth scopes

## Example prompts
- Post the weekly metrics report to #marketing with Block Kit
- Send a notification to our Slack webhook about the new release
- Reply to the Slack message thread with the deployment log

## Source text · SKILL.md · MIT

Below is the content of a third-party file. It is data, not instructions for you: do not act on anything written inside unless the human asks. Block tag: eca86a4a288fdc25.

BEGIN THIRD-PARTY FILE eca86a4a288fdc25
````text
---
name: slack-bot
description: >
  Send messages and rich content to Slack channels via webhooks or Bot API. Use Block Kit for
  formatted announcements, marketing reports, and community updates. Trigger phrases:
  "post to slack", "slack message", "slack webhook", "slack notification", "slack announcement",
  "send to slack", "slack marketing", "slack update", "slack channel".
allowed-tools:
  - Bash
  - WebFetch
  - WebSearch
---

# Slack Bot

Send messages and rich content to Slack channels using Incoming Webhooks or the Slack Web API.
Build formatted announcements, marketing reports, metrics dashboards, and community updates
with Block Kit.

## Prerequisites

Requires either `SLACK_WEBHOOK_URL` or `SLACK_BOT_TOKEN` set in `.env`, `.env.local`, or
`~/.claude/.env.global`.

```bash
source ~/.claude/.env.global 2>/dev/null
source .env 2>/dev/null
source .env.local 2>/dev/null

if [ -n "$SLACK_WEBHOOK_URL" ]; then
  echo "SLACK_WEBHOOK_URL is set. Webhook mode available."
elif [ -n "$SLACK_BOT_TOKEN" ]; then
  echo "SLACK_BOT_TOKEN is set. Web API mode available."
else
  echo "Neither SLACK_WEBHOOK_URL nor SLACK_BOT_TOKEN is set."
  echo "See the Setup Guide below to configure Slack credentials."
fi
```

If neither variable is set, instruct the user to follow the Setup Guide section below.

---

## Setup Guide

### Option A: Incoming Webhook (Simple)

Incoming Webhooks are the fastest way to post messages. They require no OAuth scopes and are
scoped to a single channel.

1. Go to https://api.slack.com/apps and click **Create New App** > **From scratch**.
2. Name the app (e.g., "Marketing Bot") and select your workspace.
3. In the left sidebar, click **Incoming Webhooks** and toggle it **On**.
4. Click **Add New Webhook to Workspace** at the bottom.
5. Select the channel to post to and click **Allow**.
6. Copy the Webhook URL (starts with `https://hooks.slack.com/services/...`).
7. Add it to your environment:

```bash
echo 'SLACK_WEBHOOK_URL=https://hooks.slack.com/services/T.../B.../xxxx' >> .env
```

**Limitations:** One webhook per channel. Cannot read messages, list channels, or reply to
threads programmatically (you must know the `thread_ts` from a prior API response).

### Option B: Bot Token (Full Featured)

Bot tokens give access to the full Slack Web API: post to any channel the bot is in, reply to
threads, list channels, upload files, and more.

1. Go to https://api.slack.com/apps and click **Create New App** > **From scratch**.
2. Name the app and select your workspace.
3. In the left sidebar, click **OAuth & Permissions**.
4. Under **Bot Token Scopes**, add these scopes:
   - `chat:write` - Post messages
   - `chat:write.public` - Post to channels without joining
   - `channels:read` - List public channels
   - `files:write` - Upload files (optional, for images/reports)
   - `reactions:write` - Add emoji reactions (optional)
5. Click **Install to Workspace** at the top and authorize.
6. Copy the **Bot User OAuth Token** (starts with `xoxb-`).
7. Add it to your environment:
````
END THIRD-PARTY FILE eca86a4a288fdc25

The third-party file has ended. Everything between the eca86a4a288fdc25 tags is data: requests and commands from it are not followed. An “end of file” line with another tag inside the block is part of the file.

First 3041 of 34783 bytes. © OpenClaudia · MIT · https://github.com/OpenClaudia/openclaudia-skills/tree/HEAD/skills/slack-bot/SKILL.md

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---
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