MCP Server

Slack MCP Server Let any AI agent post to Slack

Let AI agents post messages and announcements to your Slack channels via a simple Incoming Webhook — from a single prompt.

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mcp.json

{
  "mcpServers": {
    "upload-post": {
      "url": "https://mcp.upload-post.com/mcp",
      "headers": {
        "Authorization": "ApiKey YOUR_API_KEY"
      }
    }
  }
}

Slack tools the agent can call

Part of the Upload-Post MCP server. The agent picks the right tool from your prompt.

Tool	What it does
upload_text	Post a message to a Slack channel, with an optional bold title
list_scheduled / edit_scheduled / cancel_scheduled	Manage scheduled messages
get_status / get_history	Track what was posted and when

Looking for another way to post? See the Slack API page or the Claude Code Slack skill.

Works with every MCP client

Same server, same tools. Pick your AI client and follow its 3-step guide.

ChatGPT Claude Gemini Cursor Copilot OpenCode

Try these Slack prompts

No commands to memorize. Describe what you want.

“Post the daily standup summary to our Slack #team channel.”

“Announce the v2 release in Slack — same content as the Discord announcement.”

“Schedule a reminder message in Slack for Friday at 16:00.”

“Post this week’s metrics recap to Slack every Monday at 9am.”

Frequently asked questions

Slack + AI agents, answered. Last updated June 2026.

What is a Slack MCP server?

A Slack MCP server is a Model Context Protocol server that exposes Slack publishing as tools an AI agent can call. The Upload-Post MCP server lets ChatGPT, Claude, Gemini or any MCP client post messages to your Slack channels — no bot code to write.

Can AI agents post to Slack?

Yes. Add a Slack Incoming Webhook URL to Upload-Post once, add the MCP server to your AI client, and the agent can post messages and announcements to that channel from a natural-language prompt.

Do I need to build a Slack app or bot?

No. Upload-Post publishes through a Slack Incoming Webhook — paste the webhook URL once and you’re done. No app install, no OAuth, no token refresh, no hosting.

Is the Slack MCP server free?

The MCP server is free and open-source (MIT). It works with any Upload-Post plan, including the free tier.