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slack

Post messages and files to Slack via the Web API (chat.postMessage).

Skill by dexter

IndexedApache-2.0★ 1
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Install

Works with Claude Code, Claude apps, Codex, Cursor, Gemini CLI, GitHub Copilot, VS Code, OpenCode, Goose, Windsurf. Read the repository before you give any tool access to your data.

npx agentmarket install skill/emiliougarte65-slack

Asks which of your tools to add it to (Claude Code, Codex, Cursor, VS Code, Windsurf, Gemini CLI, Claude Desktop) and shows the change first. See https://agentmart.dev/cli.

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About

Post messages and files to Slack via the Web API (chat.postMessage). List channels, send rich messages, upload files — no SDK required. Trigger: "slack", "send slack", "mensaje slack", "post slack", "canal slack".

Use cases: backend, productivity

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Permissions

What this skill can do and what it asks for, from its SKILL.md. Checked Oct 25, 2026.

Tools
No tools found
Secrets
None asked for
Install scripts
None found
Runs as
Python package

Network hosts it talks to 1

  • codeload.github.com · found in install command

Files it touches

  • ~/.claude/skills/slack

Tools it pre-approves 1

From allowed-tools in SKILL.md: the agent may use these without asking you each time.

  • Bash

What's inside

Skill name
slack
Description
Post messages and files to Slack via the Web API (chat.postMessage). List channels, send rich messages, upload files — no SDK required. Trigger: "slack", "send slack", "mensaje slack", "post slack", "canal slack".
License
Apache-2.0
Allowed tools
Bash
Metadata
author: dexter · source: dexter · audited: true · version: 1.0
Instructions
41 lines in SKILL.md · view on GitHub

Before installing

  • Ships executable scripts
  • Pre-approves any shell command

Files (2)

  • SKILL.md
  • send.py · scripts/

SKILL.md (first lines)

# Slack

Posts messages and uploads files to Slack using the Web API. Requires a Bot Token with `chat:write` and `files:write` scopes.

## Setup

1. Create a Slack App at https://api.slack.com/apps
2. Add Bot Token Scopes: `chat:write`, `files:write`, `channels:read`
3. Install app to workspace → copy the **Bot User OAuth Token**

```bash
export SLACK_BOT_TOKEN="xoxb-..."
export SLACK_DEFAULT_CHANNEL="#general"   # optional
```

Invite the bot to channels it should post in: `/invite @YourBotName`

## Usage

```bash
# Send a message to a channel
python3 skills/communications/slack/scripts/send.py send "#alerts" "Deployment complete!"

# Send using default channel
python3 skills/communications/slack/scripts/send.py send "" "Hello team!"

# Upload a file
python3 skills/communications/slack/scripts/send.py send-file "#logs" /path/to/report.csv "Monthly Report"

# List all channels the bot can see
python3 skills/communications/slack/scripts/send.py list-channels
```

## Notes

- `SLACK_BOT_TOKEN` — required. Must start with `xoxb-`
- `SLACK_DEFAULT_CHANNEL` — optional fallback channel (name with `#` or channel ID)
- Channel can be specified as `#channel-name` or Slack channel ID (`C0123456789`)
- For DMs, use the user's member ID (starts with `U`)

From EmilioUgarte65/Dexter, Apache-2.0.

More from EmilioUgarte65/Dexter

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Stars
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Forks
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Last commit (this folder)
Mar 25, 2026 (7 months ago)

From GitHub (fetched Oct 24, 2026).

Details

Version
1.0
License
Apache-2.0
First seen
Oct 24, 2026
Last checked
Oct 24, 2026

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slack skill. Agent Mart. https://agentmart.dev/skills/emiliougarte65-slack (last updated 2026-10-24)