Slack MCP Server

Catch up on Slack without reading it. Unreads, threads, and search - in your agent’s context, from the session you already have.

People connecting browser automation tools to Claude, Cursor, VS Code, or another MCP client. The project is written in JavaScript.

VERIFIED ACTIVE

LAST COMMIT 2026-08-24 · ★ 29 · #22 OF 196 MAINTAINED BROWSER AUTOMATION · VERIFIED 2026-08-25

MIT · JavaScript servers · how we verify → /methodology

01 · Install Slack MCP Server

before you install - you'll need

Set SLACK_MCP_PROFILE before connecting.

Claude Code

claude mcp add jtalk22-slack-mcp-server --transport http https://mcp.revasserlabs.com/oauth/mcp

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "jtalk22-slack-mcp-server": {
      "url": "https://mcp.revasserlabs.com/oauth/mcp"
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

https://mcp.revasserlabs.com/oauth/mcp

transport: streamable-http

endpoint alive - authentication required · probed 2026-08-25

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as local process (stdio) - runs on your machine with your user's permissions · remote - your agent's requests go to mcp.revasserlabs.com

endpoint auth requires authentication - rejected our unauthenticated MCP initialize

license MIT - declared in the repository

npm package @jtalk22/slack-mcp - published under the repo owner's npm scope (@jtalk22)

registry namespace io.github.jtalk22 is GitHub-verified and matches the repo owner

03 · What Slack MCP Server can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

Latest releases

v5.0.0 · 2026-08-24

Speaks MCP 2026-07-28, drops the hosted stubs · Two changes, one release. The protocol layer moves to the 2026-07-28 revision · without breaking anything that talks to it today, and the two tools that never · did any…

v4.9.0 · 2026-08-13

Catch-up runs locally · slack_catch_me_up was a hosted-only stub: it advertised a rich contract in · every client's tool list and returned an upgrade payload. It runs locally now, · against your own session, with no…

v4.8.0 · 2026-08-07

No MCP tool contracts changed. This release addresses the two running costs of a browser-session Slack server: the tool schema a client carries on every turn, and the request velocity Slack's session-anomaly detection…

04 · Who maintains Slack MCP Server

Slack MCP Server is maintained by jtalk22. We track 2 MCP servers from jtalk22 - 2 actively maintained, 29 combined GitHub stars, oldest repo from Jan 2026.

05 · Facts

repository: github.com/jtalk22/slack-mcp-server
website: https://mcp.revasserlabs.com/
category: browser automation - ranked #22 of 196 actively-maintained browser automation servers as of 2026-08-25.
release cadence: 10+ releases in the last 90 days (latest 2026-08-24)
registry: io.github.jtalk22/slack-mcp-server (active, first published 2026-01-09 · 19 versions)
packages: npm:@jtalk22/slack-mcp

06 · Slack MCP Server FAQ

What is Slack MCP Server?

Catch up on Slack without reading it. Unreads, threads, and search - in your agent’s context, from the session you already have.

Is Slack MCP Server still maintained?

Yes - as of 2026-08-25, its last commit was 2026-08-24 and it shipped 10+ releases in the last 90 days. We re-verify nightly.

How do I install Slack MCP Server?

Run `npx -y @jtalk22/slack-mcp`. The README documents one environment variable (SLACK_MCP_PROFILE) to set first. Set SLACK_MCP_PROFILE before connecting. You can also paste the ready-made client config above.

Does Slack MCP Server require authentication?

Yes - when we probed the endpoint on 2026-08-25, it rejected an unauthenticated MCP initialize; you'll need credentials to connect.

07 · Alternatives to Slack MCP Server

Alternatives to Slack MCP Server

Maintained browser automation servers if Slack MCP Server isn't the fit.

Pairs well with

Servers that cover what Slack MCP Server doesn't - only shown when the pairing reason fits the companion.

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