What probably matters to youSection of the release
What
$.prompt.submit lets a plugin put a prompt into the running conversation, tagged as coming from that plugin rather than from you. Text starting with / is refused so a plugin cannot fire a slash command in your name, and attachments are refused. Each plugin has a per-session submission count and a minimum gap between its prompts.
Details
Requires an interactive session attached to the process. Headless -p runs and the SDK reject the call.
The submitted prompt is marked with the plugin's name as its origin.
Evidence
$.prompt.submit submits a prompt to the model; a text beginning with / would run a command as the user
Strings lifted out of the shipped bundle, so the claim above can be checked against them.