Wiretap

Carapace can tap into other completion sources and bridge them.

Command

Commands using the combined or detached approach can simply be invoked.

Shell

Shells are a bit trickier and may require nasty scripting.

Embed

Carapace invokes itself for continuous embedding.

Explicit

Bridges can be registered using Specs or Choices.

Implicit

Other completion sources can be configured for an implicit fallback.