The REPL example

examples/repl — an interactive session whose commands come from plugins.

The sibling of the CLI example: same platform, same plugin shape, different surface. The host ships /help and /exit and answers a plain line by echoing it uppercased — standing in for whatever a real host answers with. The plugin contributes /time, with an alias (/clock), an Alt+T shortcut, and an argument whose choices complete in the slash menu.

pip install "datalayer_reactor[repl]"
python examples/repl/host.py

An extensible REPL. / for the menu, /exit to leave.
❯ /he<tab>          # the slash menu completes
❯ /time utc         # the plugin's command, its argument completed too
❯ hello there       # plain input goes to respond()
you said: HELLO THERE
❯ /exit

File	What it shows
host.py	Building a ReactorRepl: the registry, the built-ins, respond, entry-point discovery
clock_plugin.py	A plugin: one provide_slash_commands hook, a spec with alias, shortcut, group and completable argument

The mechanism is documented on The REPL. The real-world consumer is the agent-runtimes terminal chat, which runs its Pydantic AI sessions on exactly this machinery — its slash menu, shortcuts and command registry are the ones this example demonstrates.