# What is the Architecture Context Plane?

> Canonical: https://decisionpen.com/docs/architecture-context-plane  
> Markdown mirror for agents · DecisionPen Docs

## Summary

After the IT Knowledge Continuum, the pattern is clear: AI already sits inside every quadrant of change. Without shared architecture truth, agents only speed up rediscovery. The Architecture Context Plane is institutional memory of how the enterprise is built and why — structure plus evidence and decisions. Agents help keep it current. Humans review what becomes trusted. DecisionPen is that plane.

## How AI reshapes the quadrants

Enterprise architecture can draft inventories faster — and drift faster. Solution architects can design in minutes — and invent topology when the estate is missing. Engineering agents write code without enterprise constraints unless someone pastes them in. Operations assistants reason over tickets while blast radius stays tribal. That recurring cost is the Context Tax, including token burn from re-reading the same repositories.

## Why the plane matters

It is one place for structure and memory. It is two-way with agents through MCP. Discovery, living EA, agentic SDLC, and solution design can reuse the same context instead of starting from zero.

## How DecisionPen helps each quadrant

Enterprise discovery and a living landscape for architecture. Shared truth for agentic solution design. Publish and consume for engineering through agentic SDLC. Ask with evidence for operations, with feedback back into the continuum.

## FAQ

**What is the Architecture Context Plane?**  
Shared institutional memory of how the enterprise is built and why. Agents help keep it current. Humans approve what is trusted.

**Do agents auto-confirm the map?**  
No.