---
id: "framework-open-brain-build"
type: "framework"
source_timestamps: ["00:07:29", "00:08:12", "00:09:15"]
tags: ["development", "workflow"]
related: ["concept-agent-door", "concept-human-door", "concept-open-brain", "action-create-shared-table", "action-generate-ui-code", "action-deploy-vercel"]
sources: ["s21-ai-tool-memory"]
sourceVaultSlug: "s21-ai-tool-memory"
originDay: 21
---
# Building an Open Brain Extension

## Purpose
A straightforward, multi-step process for building a new capability (an *extension*) into the [[concept-open-brain-d21]] system. Requires minimal coding knowledge — leans on AI code generation and free hosting tools.

## Steps
1. **Create a structured table** in your [[entity-supabase-d21]] database for the specific domain (e.g., maintenance, job hunt). See [[action-create-shared-table]].
2. **Wire MCP access**: ensure your AI agent has access to this new table via the existing [[entity-mcp-d21]] server (the [[concept-agent-door]]).
3. **Generate UI code**: prompt an LLM (e.g., [[entity-claude-d21]] or [[entity-chatgpt-d21]]) for a mobile-friendly web app, specifying the data schema and desired visual highlights. See [[action-generate-ui-code]].
4. **Create a free [[entity-vercel-d21]] account.**
5. **Deploy** the AI-generated application code to Vercel to generate a live, secure URL. See [[action-deploy-vercel]].
6. **Bookmark** the Vercel URL on your devices to act as the [[concept-human-door]] native app.

## Outcome
A new domain (table) of life is now accessible to both the agent (programmatically) and the human (visually) — both reading from the exact same [[concept-shared-surface]].

## Prerequisite
[[prereq-supabase-mcp-setup]] — you must already have a working Supabase + MCP foundation.