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Multi-workspace Slack MCP server with draft+confirm safety, vault auto-export, a

Multi-workspace Slack MCP server with draft+confirm safety, vault auto-export, and triple-mode…

Connector by adelaidasofia · GitHub account verified by the MCP Registry

IndexedMITLocal (stdio)★ 2
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Multi-workspace Slack MCP server with draft+confirm safety, vault auto-export, and triple-mode…

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Permissions

What this server can do and what it asks for, from its tool list, install config and code. Checked Oct 25, 2026.

Tools
10 read · 7 write · 1 delete
Secrets
None asked for
Install scripts
None found
Runs as
Downloaded binary

Tools by what they do 18

Read from the source code; the running server may list different tools.

Read 10 · Look things up without changing anything.

  • get_user_profile
  • healthcheck
  • list_channels
  • list_users
  • list_workspaces
  • read_channel
  • read_thread
  • search_channels
  • search_messages
  • search_users

Write 7 · Create, change, send or run things.

  • add_reaction
  • cancel_draft
  • confirm_send
  • mark_read
  • send_message
  • send_reply_quote
  • update_own_message

Delete 1 · Delete, drop, revoke or wipe things.

  • delete_own_message

Network hosts it talks to 4

  • app.chatprd.ai · found in code
  • code.claude.com · found in code
  • github.com · found in install command, code
  • myceliumai.co · found in code

Files it touches

  • ~/.claude/slack-mcp/.env
  • Your home directory (~)

Tools (18)

Read from the source code; the running server may differ. Descriptions are the server’s own words; hidden characters are shown as [U+…].

  • add_reaction

    Add an emoji reaction to a message. emoji is the colon-stripped name (e.g. "thumbsup", "fire", "white_check_mark"). Low-consequence write — no draft+confirm. Idempotent (Slack returns already_reacted as a soft success).

  • cancel_draft

    Cancel an unconfirmed draft. Idempotent.

  • confirm_send

    Commit a previously-drafted send. Dispatches by draft.kind: - send_message / send_reply_quote -> chat.postMessage (new message) - update_message -> chat.update (in-place edit of target_ts)

  • delete_own_message

    Delete one of your own messages. Calls chat.delete with (channel, ts). xoxc user tokens can delete their OWN messages without special scopes. Returns ok=True on success. message_not_found is treated as a soft success (already-deleted or wrong ts). Low-consequence (only your own messages, no destructive cascade) so no draft+confirm. The audit log records every call.

  • get_user_profile

    Get full profile for a user_id (U... or W...).

  • healthcheck

    Verify token validity per workspace + report draft store + audit log path. For each workspace, calls auth.test. Returns user_id and team domain on success, or error code on failure. Does not retry. A failed auth.test means the token has been invalidated (logout, password change, app revoke) and needs re-extraction per SETUP.md.

  • list_channels

    List channels in the workspace. types: comma-separated subset of public_channel, private_channel, mpim, im. Default omits DMs to keep responses short. limit caps results at the API page size.

  • list_users

    List users in the workspace. Excludes deleted by default.

  • list_workspaces

    List configured Slack workspaces with auth type and primary status. Returns a dict with `workspaces` (list of redacted profiles), `primary` (alias of the default workspace), and `errors` (config errors found at load time, e.g. malformed env values). Tokens never appear in the response.

  • mark_read

    Mark a channel read up to a given message ts. Affects unread state across all your linked devices. Use the ts of the most recent message you've read.

  • read_channel

    Read recent messages from a channel. channel accepts ID (C12345) or name (#general). Newest first. Auto-exports the result to the vault at 🤖 AI Chats/Slack/<workspace>/<channel>.md (best-effort).

  • read_thread

    Read a thread's parent message and replies. ts is the parent message timestamp (Slack message ID). channel accepts ID or name. The returned messages list includes the parent as element 0.

  • search_channels

    Substring match against channel names + topics. Case-insensitive.

  • search_messages

    Search messages with Slack's full-text search. Slack search modifiers work in `query`: `in:#channel`, `from:@user`, `before:YYYY-MM-DD`, `after:YYYY-MM-DD`, `"exact phrase"`. The explicit `channel` param is sugar — when provided, prepends `in:<channel>` to the query. Requires xoxc or xoxp auth (xoxb cannot search). Errors loudly with the workspace's actual auth_type if search isn't available.

  • search_users

    Substring match against user real_name/display_name/email/name.

Show 3 more tools
  • send_message

    Stage a message send. Does NOT post until confirm_send is called. Returns a draft_id, the resolved workspace + channel, the text preview, and an expires_at unix timestamp. Drafts expire after 1 hour and can only be confirmed once. For thread replies, set thread_ts to the parent message's ts. For replies that quote (reply with quote-block in Slack UI), use send_reply_quote instead.

  • send_reply_quote

    Stage a reply that threads under target_ts. Same draft+confirm semantics as send_message. The recipient sees the reply nested under the target message in their Slack UI.

  • update_own_message

    Stage an edit to one of your own messages. Does NOT update until confirm_send is called. Fetches the current message text up front so the draft preview shows BOTH the BEFORE and AFTER strings — a visual diff in plain Python. After confirm_send, the message is edited in place via chat.update. Returns a draft_id, the resolved workspace + channel + target_ts, and a preview dict with `before`, `after`, `target_ts`. Drafts expire after 1 hour and can only be confirmed once.

Signals

Stars
2
Forks
0
Open issues
0
Last commit
Oct 15, 2026 (14 days ago)
Last release
May 20, 2026 (5 months ago)

From GitHub (fetched Oct 24, 2026).

Details

Registry name
io.github.adelaidasofia/slack-mcp
Version
0.1.1
Auth
API key
Packages
mcpb https://github.com/adelaidasofia/slack-mcp/releases/download/v0.1.1/slack-mcp.mcpb
License
MIT
Repository
github.com/adelaidasofia/slack-mcp
First seen
Oct 24, 2026
Last checked
Oct 25, 2026
Source
Official MCP Registrygithub-graphql

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Multi-workspace Slack MCP server with draft+confirm safety, vault auto-export, a. Agent Mart. https://agentmart.dev/connectors/adelaidasofia-slack-mcp (last updated 2026-10-25)