Signal index
A short index for separating durable change from loud movement.
XYVI uses a signal index to keep research notes comparable. The index is deliberately compact. It does not try to rank every trend or pretend that all evidence is measurable in the same way. Instead, it asks whether an observation is durable, whether it meets friction in real workflows, whether it transfers across contexts, whether proof is available, and whether maintenance has been considered.
01Interface drift
Small UI and workflow changes that alter where decisions are made.
02Answer surface
Places where summaries, snippets, and agents replace ordinary discovery.
03Documentation debt
Gaps between what a system can do and what a team can explain.
04Policy friction
Rules, contracts, and jurisdictional expectations that slow adoption.
05Maintenance signal
Evidence that a tool can be operated after the launch narrative fades.
The index is useful because it resists a common research failure: collecting impressive fragments without deciding what they mean. A signal is not a prediction. It is a disciplined prompt for further checking, written clearly enough that another reader can challenge it.