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. There is also a config alternative for convenience.

Implicit

Other completion sources can be configured for an implicit fallback.