Vexa
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Runs in the cloud✓ vexa.ai
Multi-workspace Slack MCP server with draft+confirm safety, vault auto-export, a
Overview
Description from the maker (original English)
Multi-workspace Slack MCP server with draft+confirm safety, vault auto-export, and triple-mode…
PopNx MCP’s three pillars
These three are never merged into one score: opinions, measurements and popularity are different things.
- User voiceiNo reviews yetReviews open together with accounts in a later step
- Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
- UsageiVery new★ –
What you can do with it
We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.
- Connection: Runs on your computer
- Transport: stdio
- Category: Chat & email
- You need to fill in: SLACK_XOXC_TOKEN
Install
Pick the AI app you use, then copy the settings.
Before you install
- Basic checks: 1 of 1 passed
- Runs on your computer with your user’s permissions (files, network, apps).
- You fill in yourself:
SLACK_XOXC_TOKEN
Values marked secret are keys to your account. Never share them or paste them into a chat.
Which app do you use?
Pick your app above. We remember it, so next time the button says “Install in …”.
Download the maker’s .mcpb file
The link goes to the maker’s own file; we do not host or repackage it. Open the file and Claude Desktop installs it.
Run this in your terminal
Fill in the empty values before running it.
Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.
Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.
This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.
Your choice stays on this device in a cookie; no account needed.
Values you fill in
- Extracted via browser dev tools (or xoxb for bot auth)
These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.
What it can do
Runs on your computer; the tool list appears in your AI app after you install it.
Basic checksi
We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 8, 2026
- ✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account adelaidasofia, which owns the repo
- … Not checked yet
Still maintained
We have not read this repo from GitHub yet
- … Not checked yet
Has a licence
We have not read this repo from GitHub yet
- – Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
- – Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
- … Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints
Compared with others in Chat & emaili
- More stars than 0% of the other 1860 servers in this category
- Published to the registry more recently than 9% of the other 1860 servers in this category
- Basic checks equal to or better than 100% of the other 1860 servers in this category
Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.
Common questions
Is Multi-workspace Slack MCP server with draft+confirm safety, vault auto-export, a safe?
It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.
What keys or codes does it need?
You need to fill in: SLACK_XOXC_TOKEN
Does it run on my computer or in the cloud?
It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).
Is it still maintained?
The GitHub repo last changed –, and the latest version (0.1.1) reached the registry 6 months ago.
Which apps can use it?
Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need MCPB on your computer.
What can I use instead?
In the same category: Vexa, emailmd, MCP WhatsApp Cloud
Alternatives
Servers in the same category from other makers, sorted by stars.
Reading a card:↓ Downloads per weeki★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi
emailmd
Render markdown into email-safe HTML, lint drafts for deliverability problems, and preview emails.
Computer or cloud✓ emailmd.dev
MCP WhatsApp Cloud
MCP server for WhatsApp Cloud API (Meta) — messages, media, and templates via Graph API
Runs on your computer
README from the maker
Open the README
Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.
slack-mcp
Multi-workspace Slack MCP server with draft+confirm safety, vault auto-export, and triple-mode auth.
One process, N workspaces, every write goes through draft → confirm. Built because the existing Slack MCP servers are single-workspace per instance and the Anthropic reference impl was deprecated.
Why use this over the alternatives
| This | Anthropic connector | korotovsky/slack-mcp-server | |
|---|---|---|---|
| Multi-workspace per server | Yes | No | No |
| Draft + confirm on writes | Yes | No | No |
| Vault auto-export of reads | Yes | No | No |
| Prompt-injection scrubber | Yes | No | No |
| Audit log | Yes | No | No |
| xoxc / xoxp / xoxb auth | Yes | n/a | Yes |
| Status | Active | Active (limited) | Active |
Install
Open Claude Code, paste:
/plugin marketplace add adelaidasofia/slack-mcp /plugin install slack-mcp@slack-mcp
Then fill in tokens in .env (see SETUP.md for cookie extraction walkthrough).
Legacy install
git clone https://github.com/adelaidasofia/slack-mcp.git ~/.claude/slack-mcpcd ~/.claude/slack-mcp pip3 install --break-system-packages -r requirements.txt cp .env.example .env
fill in tokens — see SETUP.md for cookie extraction walkthrough
Register in your project .mcp.json (or via claude mcp add -s user):
{"mcpServers": { "slack": { "command": "python3", "args": ["-m", "slack_mcp.server"], "cwd": "/Users/YOU/.claude/slack-mcp" } } }
Restart Claude Code, then run claude mcp list to verify slack shows up.
Tools (v0.1.1)
Meta: list_workspaces, healthcheck
Read: list_channels, search_channels, read_channel, read_thread, list_users, search_users, get_user_profile, search_messages
Write (draft+confirm): send_message → confirm_send, send_reply_quote → confirm_send, update_own_message → confirm_send, cancel_draft
Write (low-consequence, immediate): add_reaction, mark_read, delete_own_message
Auth modes
| Mode | Token shape | Capability | When to use |
|---|---|---|---|
xoxc | xoxc-... + xoxd-... cookie | Full (search, internal APIs) | Default. Best for personal use across multiple workspaces. |
xoxp | xoxp-... | Permanent, OAuth, search restricted on free plans | If you don't want occasional cookie re-extraction. |
xoxb | xoxb-... | Bot-only, no search, invited channels only | Rare. Use only when you want bot semantics. |
Cookie extraction takes ~3 minutes per workspace. See SETUP.md.
Vault auto-export
Every read_channel call mirrors the channel to /🤖 AI Chats/Slack/ / .md. Idempotent (same channel + day overwrites cleanly). Disable via SLACK_MCP_VAULT_EXPORT=false.
Configuration
All config via env vars (loaded from .env at process start):
SLACK_WORKSPACES— comma-separated list of aliases (e.g.onde,mycelium)SLACK_PRIMARY_WORKSPACE— default workspace when tool calls omitworkspace- Per-workspace:
SLACK_WORKSPACE_ _TYPE,_TOKEN,_COOKIE(xoxc only),_TEAM_ID,_LABEL SLACK_MCP_VAULT_PATH— vault root for the auto-export mirror (default~/Documents/Vault)SLACK_MCP_VAULT_EXPORT—true/false(defaulttrue)SLACK_MCP_AUDIT_LOG_PATH— JSONL audit log pathSLACK_MCP_DRAFT_TTL_SECONDS— draft expiration (default 3600)SLACK_MCP_SCRUB_PROMPT_INJECTION—true/false(defaulttrue)
Safety patterns
- Draft + confirm. Every send (
send_message,send_reply_quote,update_own_message) returns adraft_id. Nothing posts untilconfirm_send(draft_id)is called. Drafts expire after 1 hour. One-time confirm.update_own_messagedrafts include a before/after preview so the operator can diff before confirming the edit. - Workspace required on writes. No global default for sends — every write tool requires
workspaceto prevent wrong-workspace posts when channel names collide. - Audit log. Every tool call appends a JSONL record. Tokens are redacted.
- Prompt-injection scrubber. Incoming message text is sanitized for known prompt-injection patterns (zalgo, role-spoof headers, fake fences). Hits are wrapped not deleted so the operator sees the attempt.
- Token redaction.
list_workspacesreturns redacted profiles only. Tokens never appear in tool responses.
Related MCPs
Same author, same architecture pattern (FastMCP, draft+confirm on writes where applicable, vault auto-export, MIT):
- imessage-mcp - macOS iMessage
- whatsapp-mcp - WhatsApp via whatsmeow
- google-workspace-mcp - Gmail / Calendar / Drive / Docs / Sheets
- apollo-mcp - Apollo.io CRM + sequences
- substack-mcp - Substack writing + analytics
- luma-mcp - lu.ma events
- parse-mcp - markitdown / Docling / LlamaParse router
- rescuetime-mcp - RescueTime productivity data
- graph-query-mcp - vault knowledge graph queries
- investor-relations-mcp - seed-raise pipeline tracker
- vault-sync-mcp - bidirectional vault sync
Telemetry
This plugin sends a single anonymous install signal to myceliumai.co the first time it loads in a Claude Code session on a given machine.
What is sent:
- Plugin name (e.g.
slack-mcp) - Plugin version (e.g.
0.1.0)
What is NOT sent:
- No user identifiers, names, emails, tokens, or API keys
- No file paths, message content, or anything from your work
- No IP address is stored after dedup processing
Why: Helps the maintainer know which plugins people actually install, so attention goes to the ones that get used.
Opt out: Set the environment variable MYCELIUM_NO_PING=1 before launching Claude Code. The hook will skip the network call entirely. Already-pinged installs leave a sentinel at ~/.mycelium/onboarded- — delete it if you want to reset state.
License
MIT — see LICENSE.