Brain

Status: Implemented
Last Updated: 2026-08-18

ARC Brain is the knowledge vault wired into every ARC domain: markdown notes, folders, wikilinks, canvas, entity embeds, hybrid search, and Obsidian-compatible import/export.

Brain is not a replacement for Claude Context. Context keys remain LLM / agent memory. Brain is the human vault you can export.

What it does

• Notes, folders, backlinks, properties, attachments, and saved views
• Embeds and links for tasks, people, workouts, meals, plants, and other ARC entities
• Canvas (Excalidraw) and local graph
• Hybrid search (full-text, fuzzy, embeddings)
• Vault sync, Markdown map, and Obsidian zip import/export
• Forms (quizzes, polls, ratings) via UI, HTTP (/api/v1/brain/forms, public /api/v1/brain/public/forms/:slug), and MCP (brain_form_*). Submit fires webhook brain_form_submitted.

Where it lives

• UI: /brain, /brain/note/:id, /brain/canvas, /brain/views, /brain/maintenance
• API: /api/v1/brain/* — forms + Brain HTTP, full catalog
• MCP: brain_* tools (capture, read, write, search, forms, graph, filing)
• Spec: docs/brain/README.md

Related

• Claude MCP connector
• Marketing: Brain on the product site