---
id: "concept-agent-door"
type: "concept"
source_timestamps: ["00:04:18", "00:07:40", "00:09:49"]
tags: ["protocol", "agent-access"]
related: ["concept-human-door", "entity-mcp", "concept-open-brain", "concept-shared-surface"]
definition: "The programmatic interface, powered by MCP, that allows an AI agent to read and write to the shared database."
sources: ["s21-ai-tool-memory"]
sourceVaultSlug: "s21-ai-tool-memory"
originDay: 21
---
# The Agent Door

## Definition
The programmatic interface, powered by MCP, that allows an AI agent to read and write to the shared database.

## Description
The **Agent Door** is the specific pathway through which an autonomous AI interacts with the [[concept-open-brain-d21]] database. It is powered by the [[entity-mcp-d21]] (Model Context Protocol).

Through this door the agent can:
- Autonomously **query** tables.
- **Write** new rows.
- **Update** existing records.
- **Reason** across multiple tables — enabling [[concept-cross-category-reasoning]].

## Why It's Distinct from the Human Door
Because the Agent Door operates programmatically, the agent can do all of the above in the **background**, updating the [[concept-shared-surface]] without requiring a visual UI. This is paired with [[concept-human-door]] for the human side — same data, two doors.

## Setup
The Agent Door is configured during [[prereq-supabase-mcp-setup]] and reused for every new domain table you add via [[framework-open-brain-build]].