When a blank conversation is sent by clicking the send button, an event is exposed externally, allowing third-party plugins to step in and handle certain tasks.

[G-Grant]

Requirement

When a user sends a regular message (by clicking the send button or pressing Enter), provide an externally exposed extension point that lets a plugin run asynchronous logic before the message is actually sent and decide how this send should be handled:

• Allow: the message is sent as usual.
• Reject: the message is not sent, the draft is preserved, and the user is shown a notice.

Scenario

My plugin, dsh-worktree-manager, lets users choose a "Worktree" environment and a base branch in an empty session. I want the worktree to be created at the moment the user clicks send, and the message to be sent into the new session, without requiring the user to first click a "Create and enter" button.

Currently, the input box has no pre-send interception point for plugins to use. Without it, the plugin can only require the user to click an extra create button.

Requirements

• The processing logic can be asynchronous; sending waits for it to complete.
• If the processing logic throws an error, do not send, keep the draft, and show a prompt.
• When there are no listeners, the existing behavior remains unchanged.