> ## Documentation Index > Fetch the complete documentation index at: https://site.aspect.build/llms.txt > Use this file to discover all available pages before exploring further. # Task `function` **Task.alias**

              
          def Task.alias(
          \*,
          defaults: dict\[str, typing.Any] = ...,
          summary: str = ...,
          description: str = ...,
          display\_name: str = ...,
          group: list\[str] = \[],
          name: str = ...
          ) -> Task
        
      
    

Define an alias of this task with overridden arg defaults. The alias is a new top-level CLI command that shares this task's `implementation` and `traits`, but exposes overridden defaults for one or more of its args. The base task is undisturbed — both commands coexist, and a CLI flag still wins over the alias's default (so `aspect buildifier --formatter-target=X` overrides the alias default). ## Naming Assign the result to a **snake\_case** variable; the CLI command name is derived from the variable. The base task's name is never inherited. Use `name = "explicit-name"` to override. ## Constraints * `defaults` keys must already exist on the base task. * The value type must match the base arg's variant (`args.string` → `str`, `args.int` → `int`, `args.string_list` → `list[str]`, etc.). `args.string(values = [...])` re-checks membership on the new default. * `args.trailing_var_args` carries no default in the schema and cannot be overridden via `defaults`. * Aliases cannot add args beyond the base. Use `task()` if you need to. ## Example ```starlark theme={null} load("@aspect//format.axl", "format") buildifier = format.alias( defaults = { "formatter_target": "@buildifier_prebuilt//buildifier", }, summary = "Format Starlark files with buildifier.", ) def config(ctx: ConfigContext): ctx.tasks.add(buildifier) ```