The composer cleared the live mention atom synchronously on send (via the
editor reset), which raced the async onNew handler that read it — dropping
every @-mention (docs, folders, connectors, and the new chat references)
from the request.
handleSubmit now snapshots the chips before clearing, and onNew consumes
that snapshot (falling back to the live atom for the send-button path),
derives the payload via deriveMentionedPayload, and sends mentioned_thread_ids.
Add a Chats tab to the mention picker (excluding the current chat), carry
the "thread" kind through the inline editor's chip nodes, and render thread
chips on user messages with navigation to the referenced conversation.
Add the "thread" mention kind (makeThreadMention + stable dedup key) so a
chat can be referenced like a document. Also introduce submittedMentionsAtom
and a pure deriveMentionedPayload() helper, the building blocks for capturing
chips at submit time and mapping them to backend payload buckets.
Mirror search_threads visibility in the referenced-chat resolver: a
search-space owner can now @-mention legacy threads that predate creator
tracking (null created_by_id), instead of those being silently dropped.
Add unit tests for role-specific turn extraction in the resolver and for
the transcript renderer: full rendering within budget, dropping oldest
turns with a marker, partial-tail fill of an overflowing turn, and
multi-chat tagging.
Thread mentioned_thread_ids from the route through the orchestrator into
input-state assembly, resolve them for the requesting user, and append
the rendered referenced-chat block to the agent's query context.
Add the referenced_chat_context slice: models for the data shapes, a
fail-closed resolver that fetches mentioned threads and their visible
turns under the same access rules as thread search, and a transcript
renderer that emits a budgeted <referenced_chat_context> block. When a
chat exceeds the per-reference character budget, recent turns are kept
and any leftover budget is filled with the overflowing turn's tail, with
truncation markers signalling the cut.
Extend the chat contract so a turn can reference other conversations:
add the "thread" kind to MentionedDocumentInfo and a mentioned_thread_ids
field on NewChatRequest and RegenerateRequest.
