The Context browser joined full content against the chat conversation
window; when a surface node's seq sat outside it, the fallback paged
blindly backwards through session.loadOlder() (up to 20 pages of 50
messages prepended into the shared chat window) and finally dead-ended
on a static note.
sessions.history already supports seq-anchored pages cut on whole
append-origin message boundaries, so ONE call with beforeSeq: seq + 1
returns exactly the page holding the event whenever the durable log
still has it. The browser now:
- fetches on miss with that single anchored read and maps the raw page
into the node shapes it already renders (new client/historyPage.ts:
user messages, assistant blocks, tool results paired with their
in-page call head, compaction checkpoints with their summary);
- merges fetched nodes under the zero-cost window join (join wins);
- reports honest states instead of one dead end: loading, absent from
the session log (compacted or cleared), failed with a retry button;
- drops the sessions.provide contribution and the MAX_AUTO_PAGES
machinery entirely - the chat scrollback is never mutated again.
Hosts without the connection api keep the static preview-plus-hint
degradation.
Bowen Liang
5cc028ff00