The Fleece AI Brain Slack connector syncs the messages from every public and private channel your connected Slack app is a member of into a local-first knowledge base — plain Markdown and SQLite on your own machine. From there, any MCP-compatible AI app such as Claude Desktop or Cursor can answer from your real Slack history, with the source one click away.
What syncs from Slack
Everything comes in as knowledge nodes — ordinary files you can open, link and search, not rows trapped in someone else's cloud.
Public channels
Every channel the connected Slack app joins is pulled in, message by message.
Private channels
Private channels sync too, as long as the app has been invited — you control the scope.
Messages as notes
Each message becomes a note titled by its first line, ready to link and retrieve.
Incremental updates
Sync resumes from a per-channel cursor, so only new messages are fetched each run.
Built-in deduplication
A seen-ledger guarantees a re-sync never creates duplicate notes.
Connect Slack in four steps
No IT project, no webhook plumbing — one sign-in from the desktop app.
- 01
Install Fleece AI Brain
Download the desktop app for macOS, Windows or Linux and open your vault — a folder of plain Markdown files on your machine.
- 02
Open Connectors and pick Slack
In the app, open the connectors panel, choose Slack, and sign in with your workspace account. OAuth is brokered securely; your Slack content never passes through our servers.
- 03
Choose what the app can see
The connector reads the channels your Slack app is a member of. Invite it to the channels that matter; leave the rest out.
- 04
Let it sync — then ask
Sync runs in the background and stays up to date. Point Claude Desktop, Cursor or any MCP app at your Brain and ask about decisions made months ago.
Slack is where decisions go to disappear.
Ask any team where the refund policy was decided, why the launch slipped, or what was agreed with that customer — the answer is "somewhere in Slack". Search gets you keywords, not context; free plans truncate history; and every new teammate or AI agent starts from zero.
The Slack connector ends the archaeology. Messages become permanent notes in one living knowledge graph, linked to the people, projects and tools they mention — so the decision made in #product in March is still one question away in December.
Your messages go from Slack to your disk. Nowhere else.
Authentication is a standard OAuth sign-in, but the actual sync calls the Slack API directly from the desktop app on your machine. Raw messages never transit Fleece's servers or any third party — they land straight in your vault as Markdown and SQLite.
That is the whole trust model: we can't read your Slack history, period. The files are yours, they open in Obsidian or any editor, and if you ever leave, you take everything with you.
- +Direct Slack-to-device sync — raw payloads never touch our servers
- +Vault = plain .md files + SQLite, 100% Obsidian-compatible
- +Works offline once synced; cloud sync is optional
Give every AI app your Slack memory.
One copy-paste connects the Brain to Claude Desktop, Cursor, Cline, Zed or agents you build. From then on, "what did we tell the customer about pricing exceptions?" is answered from the actual thread — with the source note one click away.
Because every agent and tool reads the same graph, you stop re-explaining context to each AI. On Teams, the organization map also shows which agents used that knowledge and what they cost.
Slack connector — FAQ
Does my Slack data pass through Fleece's servers?+
No. Sign-in uses a brokered OAuth flow, but the sync itself calls the Slack API directly from the desktop app on your machine. Raw messages land straight in your local vault; we never see or store your Slack content.
Which channels does the connector sync?+
Every public or private channel the connected Slack app is a member of. You scope it by inviting the app to the channels you want remembered — nothing else is read.
Does it write anything back to Slack?+
No. The connector is read-only: it pulls messages into your knowledge base and never posts, edits or deletes anything in your workspace.
How often does it sync?+
Sync runs in the background from the desktop app and resumes incrementally from where it left off, so updates are quick and only fetch new messages. Re-syncs never create duplicates.
Which plan do I need to connect Slack?+
The local brain is free, and connectors are the paid lever: Solo (€12/month) includes up to 3 connected tools, Pro (€24/month) makes them unlimited with auto-sync. Every plan starts with a 14-day trial, no card required.
How do I ask Claude or Cursor about my Slack history?+
Connect the Brain to Claude Desktop, Cursor or any MCP-compatible app with a single copy-paste. Your AI then answers from the synced Slack knowledge, citing the exact note it drew from.
Can I open the synced messages outside the app?+
Yes. Every message is an ordinary Markdown file in your vault, fully Obsidian-compatible — open, edit or grep them with any tool, and take them with you if you ever leave.
What happens if I disconnect Slack?+
Sync stops, and everything already in your vault stays yours — the notes are local files, not a mirror that vanishes with the connection.
Stop losing decisions to the scroll.
Connect Slack in one sign-in and give your whole AI stack a permanent memory of what your team already decided.