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Toothpick (alias TP) in a one sentence :

TP is a scope tree based Dependency Injection (DI) library.

TP in a nutshell :

• Injections and instance creations take place within scopes.
• If ToothPick creates an instance, it will always inject its dependencies.
• TP always bubbles up the tree of scopes, never down.
• A scope contains bindings and scoped singletons.
• Children scopes inherit bindings, they can override them.
• Children scopes can access their parents' bindings & scoped singletons.
• Bindings can be either scoped or unscoped.
• Scoped binding dependencies are either unscoped or scoped in the scope itself or its parents. <--this one is tough
• A scope can be bound to a scope annotation.
• Using a scope annotation is the same as scoping a binding.

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//a typical Toothpick scope tree during the execution of an Android app.

       @ApplicationSingleton 
         /              |    \  
        /               |     \
       /                |      \
   @PresenterSingleton  |   Service 2
         /              | 
        /            Service 1  
       /            
Activity 1
    /   \
   /   Fragment 2
  /
Fragment 1

One of the goals of the Toothpick development team is to document Toothpick properly. This wiki is part of our effort as well as the code comments and javadoc.