lumbridge-code/docs/decisions/0001-product-boundary.md

0001: Lumbridge is the workspace, not one more mandatory agent

Status: accepted for the architecture phase.

Lumbridge owns terminals, workspaces, session durability, integration, review, and usage observability. Existing coding harnesses remain first-class processes. ACP provides rich structure and PTYs provide universal compatibility.

This boundary preserves user subscriptions, harness-native capabilities, and choice. It also prevents an early attempt to build a terminal, IDE, multiplexer, provider SDK, and universal agent loop as one inseparable component.

We may later ship an optional Lumbridge-native harness, but the application must remain valuable without it.