Concept Alias

<!-- Canonical one-paragraph definition. Edit here; reuse via {{#include}}. -->

Alias. An alias is the name you assign to a configured instance, then reference elsewhere to point at it. You choose the name freely; other parts of the config wire things together by that name. Aliases are lowercase ASCII letters, digits, and single underscores, must start and end with a letter or digit, and cannot contain __ or hyphens. In the config they appear as the <alias> segment of a section header, such as [agents.<alias>] or [providers.models.<type>.<alias>]. See Reference → Environment variables → Alias grammar.