MCP servers

Slack MCP servers in 2026.Slack runs its own, and it does a lot.

Slack has an official MCP server at mcp.slack.com, made by Slack: it searches, reads channels and threads, and sends or schedules messages as you, once a workspace admin approves the client. Open-source servers run with a bot token from your own Slack app, and a few borrow your browser session instead. Breakreach's hosted connector only posts, to one channel you pick, alongside your other networks.

Connect Slack to Claude or ChatGPTChecked October 7, 2026. Breakreach is our product.

Claude

Breakreach

Post the Morning Light launch in our #announcements channel tomorrow at 9 AM, with the launch photo

Scheduling on Slackcreate_post

Reply to Claude…

Scheduled · Tomorrow, 9:00 AM

announcementsNorthbeam Coffee

BreakreachAPP9:00 AM

Morning Light ships tomorrow. Honey, orange and cocoa notes, our lightest roast yet. The team gets the first bags at the roastery at 8.

Slack MCP servers compared

	How it connects	What it does	Within Slack's rules
Breakreach	Hosted. Breakreach's Slack app, posting to the channel you pick; OAuth from Claude's and ChatGPT's directories	Posts text and photos to that channel, scheduled; doesn't read Slack	Yes, An incoming webhook
Slack's MCP server	Hosted by Slack at mcp.slack.com. OAuth as you, for a client your workspace admin approves	Searches and reads channels and threads, sends, schedules and drafts messages, canvases, lists, files	Yes, Slack's own
Slack in ChatGPT	Built by OpenAI. Paid ChatGPT plans, one workspace at a time	Searches messages and threads; admins can turn on actions such as reminders and file uploads	Yes, OAuth
zencoderai/slack-mcp-server	Open source, runs on your machine. Your own Slack app's bot token	Lists channels, posts, replies in threads, reacts, reads history and users	Yes, A bot
korotovsky/slack-mcp-server	Open source. A bot or user token, or browser session tokens (its stealth mode)	Reads and searches channels, threads and DMs; posting is off until you turn it on	With bot or user tokens; the browser tokens aren't an API credential Slack documents
Other schedulers' MCP servers (Postiz, Zernio)	Hosted. Postiz in both directories; Zernio by URL	Channel posts among their other networks	Yes

Checked on October 7, 2026, from each project's README and Slack's, Anthropic's and OpenAI's documentation. Breakreach is our product.

Our recommendation

To post to Slack from an assistant, use Breakreach.We built it, so here's the case.

Connect Slack

The Slack post is one of several: the same request schedules the announcement on LinkedIn, X and the rest
It posts as the Breakreach app, to one channel, and can't read your workspace
Nothing to host and no Slack app of your own to create

When to pick something else. For anything inside Slack itself, such as searching, reading threads or sending as you, Slack's own MCP server does far more than Breakreach, which only posts. Slack's server needs your admin's approval; in Claude, Anthropic lists its Slack connector for Team and Enterprise plans.

The kinds of Slack MCP serverHow each one gets to your account.

Slack's own server, as you

Slack's MCP server, generally available since February 2026, signs in with OAuth as you and acts with your access: search, channel history, threads, messages, scheduled messages, canvases, lists and files. Each client app needs a workspace admin's approval, and Slack only lets Marketplace and internal apps be clients. Claude's Slack connector, made by Slack, uses it, and Slack documents setups for Claude Code, Cursor and Codex.

Your own Slack app, with a bot token

The reference Slack server from the MCP project, now archived and maintained by Zencoder as zencoderai/slack-mcp-server, and ubie-oss/slack-mcp-server run with a bot token (xoxb-) from an app you create and install in your workspace. It's within the rules, sees only what you grant it, and you host it.

Your browser session

korotovsky/slack-mcp-server, the most-starred one (1,860 stars on GitHub in October 2026), offers a stealth mode with the xoxc and xoxd tokens of your logged-in browser, and redhat-community-ai-tools/slack-mcp extracts tokens from a browser it drives. Slack's Developer Policy bans using unpublished APIs and circumventing Slack's access controls, so you take that risk on your workspace.

Posting only, hosted

Breakreach adds its Slack app with an incoming webhook: you pick the channel on Slack's page, and the assistant can post there, now or scheduled, as part of a post that also goes to your other networks.

What Slack's API lets a server doThe rules every server works within.

Incoming webhooksOne URL per channel, picked by the person installing the app. A webhook posts as the app, answers ok without a message id, and its messages can't be edited or deleted through the API.
Bot tokenschat.postMessage with chat:write posts about one message a second per channel, and chat.scheduleMessage schedules up to 120 days ahead.
ReadingSince May 29, 2025, apps sold outside the Marketplace can read history at 1 request a minute and 15 messages a call, which is why most read-heavy tools go through Slack's own server.
DataSlack's API terms forbid training a language model on Slack data, and activity through its MCP server shows in the audit logs.

What Breakreach's Slack tools doAnd what they don't, yet.

What you can ask for

Text messagesIn the channel you picked, as the Breakreach app. Long text is split into blocks so it shows whole.
PhotosUp to 10 JPG, PNG or GIF photos under the text; a video or a WebP image goes in as a link.
SchedulingAt a time you give, or the next free slot of your posting schedule.
The same post elsewhereOne request can post to Slack, LinkedIn, X and the rest, each with its own text.

Not yet, or not possible

Reading, searching or summarizing Slack
Threads, mentions and @channel
Editing or deleting a message once it's posted
Stats

Set it up in Claude.7 steps, once. ChatGPT works the same way.

Claude· Customize › Connectors
Connectors
Search
Breakreach
Schedule and publish to 15 social networks
Connect
Connectors let Claude use outside tools for you. You can disconnect them at any time.

Claude· Customize › Connectors

Connectors

Breakreach

Schedule and publish to 15 social networks

Connect

Connectors let Claude use outside tools for you. You can disconnect them at any time.

In Claude Code, Cursor or any MCP clientOne hosted server, OAuth or an API key.

The server lives at https://api.breakreach.com/mcp and speaks Streamable HTTP, so there is nothing to install. Clients that handle OAuth sign you in; others send an API key from Settings → API & MCP.

Claude Code (then run /mcp to sign in)

claude mcp add --transport http breakreach https://api.breakreach.com/mcp

Cursor (~/.cursor/mcp.json)

{
  "mcpServers": {
    "breakreach": {
      "url": "https://api.breakreach.com/mcp",
      "headers": { "Authorization": "Bearer br_YOUR_API_KEY" }
    }
  }
}

Step-by-step setup for each client: Claude Code, Cursor, Codex and OpenClaw.

What to askThree requests that work on Slack today.

“Post the release notes in #announcements tomorrow at 9 AM”
“Send the launch announcement to Slack, LinkedIn and X at 10 AM”
“Write a short Monday reminder for the team channel and schedule it”

FAQ

Questions, answered.

Short answers about Slack MCP servers.

Yes. Slack runs one at https://mcp.slack.com/mcp: it searches, reads channels and threads, sends and schedules messages, and works with canvases, lists and files, as you, once a workspace admin approves the client.

Yes. Slack's own connector sends messages as you. Breakreach posts as its app to one channel, scheduled, alongside your other networks.

It acts as you, with everything you can see, outside Slack's documented credentials. Slack's Developer Policy bans unpublished APIs and circumventing its access controls. Use Slack's server or a bot token instead.

No. It posts through an incoming webhook, which only sends to the channel you picked, and reads your workspace's name and icon.

In Claude: Customize → Connectors → Discover, search Breakreach, Connect. In ChatGPT: Settings → Plugins, search Breakreach, Connect. In Claude Code: claude mcp add --transport http breakreach https://api.breakreach.com/mcp, then /mcp to sign in. Then add Breakreach to Slack from Settings and pick the channel.

Creating a Breakreach account and connecting your first social account is free. Scheduling and publishing need a plan, from $29 a month ($23 billed yearly) for 5 accounts.