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Web Shell default mid-turn insertion

docs/design/web-shell-default-mid-turn-insert.md

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Web Shell default mid-turn insertion

Problem

Messages sent while a turn is running are currently admitted as ordinary pending prompts. The UI may then expose a separate insert action, even though the expected send behavior is to make the message available to the running turn automatically.

Behavior

  • A plain-text model prompt sent during an active turn is offered to the daemon's mid-turn queue by default.
  • The prompt remains visible in the Web Shell queue until the daemon reports that it was actually injected into the running turn.
  • The prompt disappears only after that injection event. Acceptance of the enqueue request alone is not treated as insertion.
  • A new client connected to an older daemon keeps its ordinary pending-prompt fallback. Once a query-capable client receives an acceptance, the daemon owns the message: if the active turn becomes idle before injection, it promotes the message into its normal prompt FIFO.
  • Anonymous live-steering messages remain private to the active coordinator. If one misses the final drain before the turn settles, the coordinator starts it as the next collected turn instead of exposing or promoting it as a bare prompt.
  • Commands and prompts with images continue through the ordinary pending-prompt path because they cannot be represented by the text-only mid-turn API.
  • The queue no longer exposes a separate insert action.

State model

For a daemon advertising session_mid_turn_message_query, the daemon is the only owner of an admitted message. The Web Shell does not keep a parallel mid-turn queue: it renders the daemon's session snapshot and never resubmits at idle, on session switches, or during page teardown. Delete and edit mutate the daemon queue by stable message id. Settled ids remain in a bounded reconciliation ring so an ambiguous HTTP retry cannot recreate a removed or already-injected message. Older daemons keep the legacy local submitting and queued fallback.

The daemon injection event includes stable message ids and message text. New clients reconcile by id; text and originator matching remains as a compatibility fallback for older daemons. Stable-id reconciliation is session-wide: every attached client sees and may mutate the same daemon-owned queue regardless of which client submitted a message. These anonymous queue-only coordinator messages are still delivered to the ACP child but are excluded from this session-wide event and snapshot surface. Daemon queue additions and removals reuse the session pending-prompt change events so every connected client refreshes the authoritative snapshots.

The queue and reconciliation rings are process-local. A child-channel exit terminates the live session with session_died; queued messages are not promoted into the removed session or retained across that terminal failure.

Delete and edit are shown only when the daemon advertises session_mid_turn_message_mutation. This keeps clients compatible with older daemons that can accept mid-turn messages but cannot remove them by id.

Compatibility

session_mid_turn_message_query is the ownership boundary. A new client uses client-generated message ids and relies on a daemon advertising that feature for reconciliation and idle promotion. A new client connected to an older daemon keeps the legacy local fallback. Client and daemon versions are deployed together otherwise, so a daemon advertising the capability owns every accepted mid-turn message.