Attribute Macro child 

#[child]

Attribute macro for individual child methods within a #[plexus_macros::activation] impl block.

Two method shapes are accepted:

Shape	Role	Example
fn NAME(&self) -> Child (no args)	Static child — routing name is the method name	fn mercury(&self) -> Mercury
fn NAME(&self, name: &str) -> Option<Child> (sync or async)	Dynamic fallback dispatcher	fn planet(&self, name: &str) -> Option<Planet>

The enclosing #[plexus_macros::activation] macro collects all #[child] methods and generates a ChildRouter impl whose get_child(name) dispatches over them. #[child] methods are not exposed as Plexus RPC methods — they contribute only to ChildRouter routing.

Example

#[plexus_macros::activation(namespace = "solar")]
impl Solar {
    #[plexus_macros::child]
    fn mercury(&self) -> Mercury { self.mercury.clone() }

    #[plexus_macros::child]
    async fn planet(&self, name: &str) -> Option<Planet> {
        self.lookup_planet(name).await
    }
}

Used standalone (outside an #[activation] block) this attribute is a no-op that returns the function unchanged.