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adding-a-feature

The four-area checklist every new feature must complete. Use when adding any feature, integration, or capability to ensure the agent and UI stay in parity.

templates/mail/.agents/skills/adding-a-feature/SKILL.md

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# Adding a Feature — The Four-Area Checklist

## Rule

Every new feature MUST update all four areas. Skipping any one breaks the agent-native contract — the agent and UI must always be equal partners.

Scope check first: this is the checklist for a feature that adds app data or a new capability. A restyle, a copy change, or a screen with no new data model and no new agent-visible operation only needs the areas it actually touches — do not manufacture actions, state keys, or a skill for it.

## Why

Agent-Native apps are defined by parity: everything the UI can do, the agent can do, and vice versa. A feature that only has UI is invisible to the agent. A feature that only has scripts is invisible to the user. A feature without app-state sync means the agent is blind to what the user is doing.

## The Checklist