The Brain is AgentPlayground's shared knowledge base — a folder of notes (a "vault") that every
agent can search and write to, plus your uploaded files. It's what lets a task started today build
on something a different team learned last week, instead of every conversation starting from zero.

• Notes — Markdown files organized into folders, each with a title, tags, and an updated-at timestamp. Notes render as formatted Markdown by default (headings, lists, checkboxes, code blocks, links) with a raw source/edit mode when you need it, the same split-view pattern apps like Obsidian use.
• Personal — Ideas, Future Projects, Journal, Goals
• Business — Business Plans, Clients, Research, Finances
• Education — Certifications, Courses, Notes, Resources
• Resources — References, Templates
• Plus Teams/, Projects/, Meetings/, and Status/ — written to automatically as teams and projects work, and as meetings conclude
• Uploaded files — documents you upload directly. Office files (.xlsx, .docx, .pptx, .pdf, .csv) are automatically converted to Markdown and indexed, no manual step needed.
• Capture — a quick-add panel for typing or pasting a note straight into a chosen folder without leaving the Brain view.
• Tags — every note can carry tags, which is what lets a playground scope its Brain view to just the notes relevant to it.
• Graph view — a visual map of notes and how they link to each other, toggled from the Brain header.

Agents search the vault (semantically, not just by keyword) before answering domain questions, and
write results back after finishing work — so the CRM, project briefs, meeting outcomes, and research
findings all accumulate in one searchable place over time. The coordinator is explicitly instructed
to check the vault first rather than answer from memory alone.

If you're setting up your vault by hand, or want the same folder conventions the in-app wizard uses
without going through setup again, there's a free, public, no-login tool:
[Brain Starter Pack Builder](/docs/brain-starter-pack). Pick which categories you want
(Personal, Business, Education, Resources — any combination), see a live preview of what's inside,
and download a ready-to-use folder structure with README files explaining the conventions, including
the Filekeeper role's ground rules. It's reachable from this page and from the Brain tab itself.

Inside the app, the Brain lives in the Overview tab as a full-width, three-pane workspace: a folder
tree on the left, the open note or file in the center, and search across the top. Upload, Capture,
and the graph toggle all live in the same header. Inside a playground, the Brain view shows only
what's tagged for that playground — the same underlying vault, scoped down.