Brain
Brain is context for a connected assistant. It is private, unencrypted, and out of cheat search. It is a separate section from Notes: separate tools, a separate cap, and its own collection.
An assistant has to be able to read briefs and rules, which is why Brain is not encrypted. Anything that must stay unreadable even to Cheats belongs in Vault.
Three kinds
| Kind | Who writes it | What it is for |
|---|---|---|
| Brief | You | Orienting context: who you are, what you are working on, how the account is organised |
| Rule | You | A constraint the assistant has to follow |
| Memory | The assistant | Something it records for itself, so a later session can pick it up |
You can edit or delete any of the three. Deleting is the trash control on the card. Brain entries are standing reference, so the control removes them rather than marking them done.
What gets sent
When an MCP client connects, your briefs and rules are handed over as the server's instructions, before the assistant does anything. The same text is what get_guides returns, which is how a long session can re-read them after you have changed them.
Memories are not part of that hand-over. The assistant reads and writes them with the Brain tools when it needs them.
Tip. Put the rules you actually want followed into Rule, and keep Brief short. A long brief competes with the rules for the assistant's attention at the start of every session.
Not a second Notes page
- Notes tools cannot read or change Brain. Brain tools cannot read or change Notes.
- An id sent to the wrong section is a not found, not a leak across the two.
- There is no visible revision history. An edit replaces the entry you see.
Sharing uses the same control as Notes: only you, anyone with the link, or specific people. Specific people are emailed, and an address with no account yet is kept until they sign up with it. A shared Brain entry is readable by that person, because it is stored unencrypted.
From an assistant
search_brain, get_brain, add_brain, update_brain, and delete_brain. Writing needs Pro.
get_guides is the briefs and rules only. It does not require you to call it at the start of a session. The connection already sent them.
Plans
Free can keep 5 live Brain entries, counted separately from Notes. Pro removes the cap. Deleting an entry frees a slot.
Related
- Connect an assistant for how a client receives this text.
- Notes for your own lists.
- MCP clients for the client-by-client steps.