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An uncreated chat kept one draft per agent (`__new__:<agentId>`), so
switching the agent picker mid-compose swapped the draft out from under
the user and left invisible per-agent drafts behind. That slot shape was
never a product decision: it fell out of 34e452776, which keyed the
editor by agent to remount it and refresh the Tiptap placeholder. The
placeholder now syncs live, so the motive is gone — and mobile already
implements the target contract.
An uncreated chat now has ONE draft slot per workspace. `selectedAgentId`
is the send target, not draft ownership. Created sessions keep their own
per-session slots, so conversations stay isolated.
Three connected changes this needs to actually hold:
- Editor identity no longer tracks the agent. Keying it by agent kept the
draft slot correct but still remounted on switch, dropping whatever the
100ms draft debounce had not yet persisted — the last thing typed.
- The post-send "scrub the composer?" rule reads `activeSessionId` alone.
Moving the picker is no longer navigation, so counting it as such left
a completed send's text in the composer, primed to be sent a second
time to the agent just picked. Both send chains (the chat tab's
controller and the floating ChatWindow) now share one exported rule
rather than two copies of the predicate.
- Legacy `__new__:<agentId>` slots are folded on load. They carry no
timestamp, so when several exist none can be shown to be newest: adopt
the persisted `selectedAgentId`'s slot (the draft the workspace would
have opened with) and drop the rest — those extras are the invisible
multi-draft state this removes. Text and attachments migrate together
so a draft can't end up with another agent's files.
Tests cover the acceptance scenarios: agent switch preserves text,
attachments and the live editor instance; sessions stay isolated; the
first send clears the draft and routes to the agent selected at send
time; a failed create keeps the input; and the migration adopts, prunes,
persists, and is idempotent.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Co-authored-by: multica-agent <github@multica.ai>