Slack MCP Server

Give your AI agent full Slack access — and structured workflow output the AI can actually use. No app registration, no admin approval, no OAuth. One command, 21 tools, works with any MCP client.

npx -y @jtalk22/slack-mcp --setup

▶ Watch the demo — 7 scenarios, from 47 unreads to inbox zero, without opening Slack.

Ask your AI to catch you up on #engineering from the last 24 hours. Search for that deployment thread from last week. Find the printer admin PIN nobody can remember. Send a reply. All from your editor.

Interactive demo · Latest release

Why This Exists

Slack's official MCP server requires a registered app, admin approval, and doesn't work with Claude Code or GitHub Copilot due to OAuth/DCR incompatibility. Screenshotting messages is not a workflow.

This server uses your browser's session tokens instead. If you can see it in Slack, your AI agent can see it too. No app install, no scopes, no admin.

Session-token transport: No bot user appears in the workspace admin panel, no app install shows up, no audit trail entry is created. Your AI agent operates with the same workspace footprint as your browser tab — nothing more, nothing less.

	Slack Official MCP	This Server
OAuth app required	Yes	No
Admin approval	Yes	No
Works with Claude Code	No (DCR incompatible)	Yes
Works with Cursor	No	Yes
Works with Copilot	No	Yes
Works with Windsurf	No	Yes
Works with Gemini CLI	No	Yes
Works with Codex CLI	No	Yes
Setup time	~30 min	~2 min
Tools	Limited	21
Visible to admins	Yes	No — session-token transport

Workflow Primitives (new in 4.2)

Save a workflow profile that binds a workflow_kind to channels + priority people + retention + cadence. Stored locally at ~/.slack-mcp-workflows.json. The hosted brain at mcp.revasserlabs.com reads these profiles and returns structured JSON per workflow_kind — downstream automation (Linear, Notion, status dashboards) consumes the JSON directly.

workflow_kind	Returns (structured JSON)
incident_room	{incident_summary, timeline, open_risks, owner_gaps, next_actions}
exec_brief	{summary, decisions, risks, asks, action_items}
support_inbox	{open_threads, ack_lag, owner_gaps, escalations, next_actions}
product_launch_watch	{launch_signals, feedback_themes, blockers, metrics, next_actions}
custom	{summary, highlights, open_questions, next_actions}

Six prebuilt templates ship with the package:

npx -y @jtalk22/slack-mcp --apply-template oncall-handoff --channels C012345,C067890

Available templates: oncall-handoff, support-triage, exec-monday, sprint-tracker, customer-feedback, incident-room. The structural primitives (slack_workflow_save, slack_workflows) are free forever in OSS; the hosted brain is $0 to start (no card) and $9/mo Pro for unlimited AI tools (scheduled morning catch-up DM rolling out Q2 2026).

Quick Start per Client

Claude Desktop / Claude Code

Add to ~/.claude.json or Claude Desktop settings:

{
  "mcpServers": {
    "slack": { "command": "npx", "args": ["-y", "@jtalk22/slack-mcp"] }
  }
}

Cursor

Add to .cursor/mcp.json:

{
  "mcpServers": {
    "slack": { "command": "npx", "args": ["-y", "@jtalk22/slack-mcp"] }
  }
}

Windsurf

Add to ~/.codeium/windsurf/mcp_config.json:

{
  "mcpServers": {
    "slack": { "command": "npx", "args": ["-y", "@jtalk22/slack-mcp"] }
  }
}

Gemini CLI

Add to ~/.gemini/settings.json:

{
  "mcpServers": {
    "slack": { "command": "npx", "args": ["-y", "@jtalk22/slack-mcp"] }
  }
}

Codex CLI

Add to ~/.codex/config.toml:

[mcp_servers.slack]
command = "npx"
args = ["-y", "@jtalk22/slack-mcp"]

Or via CLI: codex mcp add slack -- npx -y @jtalk22/slack-mcp

Tools

Tool	Description	Safety
slack_health_check	Verify token validity and workspace info	read-only
slack_token_status	Token age, health, and cache stats	read-only
slack_refresh_tokens	Auto-extract fresh tokens from Chrome	read-only*
slack_list_conversations	List DMs and channels	read-only
slack_conversations_history	Get messages from a channel or DM	read-only
slack_get_full_conversation	Export full history with threads	read-only
slack_search_messages	Search across workspace	read-only
slack_get_thread	Get thread replies	read-only
slack_users_info	Get user details	read-only
slack_list_users	List workspace users (paginated, 500+)	read-only
slack_users_search	Search users by name, display name, or email	read-only
slack_conversations_unreads	Get channels/DMs with unread messages	read-only
slack_send_message	Send a message to any conversation	destructive
slack_add_reaction	Add an emoji reaction to a message	destructive
slack_remove_reaction	Remove an emoji reaction from a message	destructive
slack_conversations_mark	Mark a conversation as read	destructive
slack_workflow_save	Save a workflow profile (channels, kind, retention, cadence) to ~/.slack-mcp-workflows.json	local-write
slack_workflows	List saved workflow profiles	read-only
slack_smart_search	Semantic search across indexed channels — hosted brain	hosted-stub†
slack_catch_me_up	AI-summarized digest of unreads + priority threads — hosted brain	hosted-stub†
slack_triage	Prioritized action queue across channels — hosted brain	hosted-stub†

21 tools total: 12 read-only Slack, 4 write-path Slack, 2 workflow profile primitives (1 local-write, 1 read-only), 3 hosted stubs. All carry MCP safety annotations.

* slack_refresh_tokens modifies local token file only.

† Hosted stubs return a structured upgrade payload (signup_url, free_tier_quota, pro_value_prop) — no Slack write occurs from OSS. Activate the brain at mcp.revasserlabs.com (free tier, no card).

Install

Node.js 20+

npx -y @jtalk22/slack-mcp --setup

The setup wizard handles token extraction and validation.

Claude Desktop (macOS)

Edit ~/Library/Application Support/Claude/claude_desktop_config.json:

{
  "mcpServers": {
    "slack": {
      "command": "npx",
      "args": ["-y", "@jtalk22/slack-mcp"]
    }
  }
}

Claude Desktop (Windows/Linux)

Edit %APPDATA%\Claude\claude_desktop_config.json:

{
  "mcpServers": {
    "slack": {
      "command": "npx",
      "args": ["-y", "@jtalk22/slack-mcp"],
      "env": {
        "SLACK_TOKEN": "xoxc-your-token",
        "SLACK_COOKIE": "xoxd-your-cookie"
      }
    }
  }
}

Windows/Linux users must provide tokens via env since auto-refresh is macOS-only.

Claude Code

Add to ~/.claude.json:

{
  "mcpServers": {
    "slack": {
      "type": "stdio",
      "command": "npx",
      "args": ["-y", "@jtalk22/slack-mcp"]
    }
  }
}

Cursor / Copilot / Other MCP clients

Any client that supports stdio MCP servers works. Add to your client's MCP config:

{
  "slack": {
    "command": "npx",
    "args": ["-y", "@jtalk22/slack-mcp"],
    "env": {
      "SLACK_TOKEN": "xoxc-your-token",
      "SLACK_COOKIE": "xoxd-your-cookie"
    }
  }
}

On macOS, tokens are auto-extracted from Chrome — env block is optional.

Claude Web / Remote MCP

Hosted tiers at mcp.revasserlabs.com:

Tier	Price	What it owns
Self-host	Free (MIT)	Local stdio, all 21 tools (16 read/write Slack + 2 workflow profile primitives + 3 discoverable upgrade stubs to hosted brain)
Hosted Free	$0 (no card)	Email signup, 1 workspace, 10 smart_search/mo + 3 catch_me_up/mo + 5 triage/day. All 5 workflow profile types. 7-day index retention.
Pro	$9/mo	Unlimited AI tools, scheduled morning catch-up DM (rolling out Q2 2026, 8am workspace tz), permanent OAuth, 90-day Vectorize, 2 workspaces
Team	$49/mo flat	Pro + shared workflow profiles + audit log + 24h support + scheduled catch-up to channel + 5 workspaces
Ops	from $199/mo (custom)	SLA, custom retention, SOC2 evidence path, multi-tenant isolation, 10+ workspaces, dedicated workflow tuning

Docker

docker pull ghcr.io/jtalk22/slack-mcp-server:latest

{
  "mcpServers": {
    "slack": {
      "command": "docker",
      "args": ["run", "-i", "--rm",
               "-v", "~/.slack-mcp-tokens.json:/root/.slack-mcp-tokens.json",
               "ghcr.io/jtalk22/slack-mcp-server"]
    }
  }
}

Restart your client after configuration. Full setup: docs/SETUP.md

How It Works

Session tokens (xoxc- + xoxd-) from your browser. If you can see it in Slack, this server can see it too.

Token persistence — four-layer fallback:

1. Environment variables (SLACK_TOKEN, SLACK_COOKIE)
2. Token file (~/.slack-mcp-tokens.json, chmod 600)
3. macOS Keychain (encrypted)
4. Chrome auto-extraction (macOS)

Tokens expire. The server notices before you do — proactive health monitoring, automatic refresh on macOS, warnings when tokens age out. File writes are atomic (temp file → chmod → rename) to prevent corruption. Concurrent refresh attempts are mutex-locked.

What's New in 4.2.0

• Workflow primitives — slack_workflow_save + slack_workflows bind a workflow_kind (incident_room, exec_brief, support_inbox, product_launch_watch, custom) to channels, priority people, retention, and cadence. The hosted brain returns structured JSON per kind — incident_room returns {incident_summary, timeline, open_risks, owner_gaps, next_actions}, exec_brief returns {summary, decisions, risks, asks, action_items}. Downstream automation (Linear, Notion, dashboards) consumes the JSON directly.
• Discoverable upgrade stubs — slack_smart_search, slack_catch_me_up, slack_triage appear in OSS as upgrade payloads pointing at the hosted brain. Response shape is {signup_url, free_tier_quota, pro_value_prop} — no interruptions, the AI routes the user cleanly.
• Six prebuilt templates — apply with npx -y @jtalk22/slack-mcp --apply-template <name> --channels C012,C034. Names: oncall-handoff, support-triage, exec-monday, sprint-tracker, customer-feedback, incident-room. Read them, fork them, edit them — they're JSON profiles.
• Setup wizard hosted bridge — six in-wizard moments surface the hosted free tier (no card) where it matches the user's pain. Stays out of the way otherwise.
• Prior reliability fixes carried forward — LevelDB token extraction, multi-profile enumeration, and explicit SIGTERM/SIGINT/SIGHUP/stdin shutdown handlers ship in 4.2.0 too.

Full release notes on GitHub releases/latest.

Hosted HTTP Mode

For remote MCP endpoints (Cloudflare Worker, VPS, etc.):

SLACK_TOKEN=xoxc-... \
SLACK_COOKIE=xoxd-... \
SLACK_MCP_HTTP_AUTH_TOKEN=change-this \
SLACK_MCP_HTTP_ALLOWED_ORIGINS=https://claude.ai \
node src/server-http.js

Details: docs/DEPLOYMENT-MODES.md

Troubleshooting

Tokens expired: Run npx -y @jtalk22/slack-mcp --setup or use slack_refresh_tokens (macOS).

DMs not showing: Use slack_list_conversations with discover_dms=true.

Client not seeing tools: Check JSON syntax in config, restart client fully.

More: docs/TROUBLESHOOTING.md

Docs

• Setup Guide
• API Reference
• Architecture
• Deployment Modes
• Use Case Recipes
• Troubleshooting
• Compatibility

Security

• Token files: chmod 600 (owner-only)
• macOS Keychain encrypted backup
• Web server binds to localhost only
• API keys: crypto.randomBytes
• See SECURITY.md

Contributing

PRs welcome. Run node --check on modified files before submitting.

License

MIT — See LICENSE

Disclaimer

Not affiliated with Slack Technologies, Inc. Uses browser session credentials — check your workspace's acceptable use policy.

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Hosted version live at mcp.revasserlabs.com: Free tier (no card), $9/mo Pro, $49/mo Team flat, Ops from $199/mo. Hosted owns the AI brain (smart_search, catch_me_up, triage), the scheduled morning catch-up DM at 8am workspace time (rolling out Q2 2026), permanent OAuth (no 2-week token rotation), 90-day Vectorize retention, and shared workflow profiles. The OSS package owns local stdio + all 16 read/write Slack tools + workflow profile primitives (slack_workflow_save, slack_workflows). The 3 paid stubs (slack_smart_search, slack_catch_me_up, slack_triage) appear in OSS as discoverable upgrade prompts.