Refreshing mid-turn appeared to kill the agent's output. It never did: the
session survives a dropped socket, the agent keeps generating into it and keeps
committing durable events, and `close` only detaches the socket and arms an
hour-long idle timer. What broke was purely delivery — and the reconnect path
that would have fixed it could not fire, because the browser came back having
forgotten officer's session key. It lived in page state. The only id left was
Claude's transcript uuid in the URL, and nothing accepted that.
So accept it. `attach` carries the uuid, and the agent's on-disk session map —
the single record relating the two — turns it back into the key everything else
is written in terms of. The uuid now also goes out at `system.init` rather than
only at `result`, which is what makes the first turn recoverable at all: until
now a chat had no address until it had finished, and a long first turn is
exactly the one worth reconnecting to.
`sync:live` deliberately carries no messages. The harness writes its transcript
as it goes, so the HTTP load on landing already supplies the past; sending the
server's record of the same messages on top of it would duplicate them, and
there is no shared id to reconcile the two by. Attach hands over the rest of the
turn, the half-written paragraph the transcript cannot hold, and the session's
cursor head — that last one so a *later* drop replays from the head instead of
re-delivering the whole conversation from zero.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Compaction was the one thing the harness does that emitted nothing at all while it
ran, and it can run for minutes — silence that reads as a hung turn, which costs a
server restart to discover it wasn't. The sidecar now reports both ends: the start
from the PreCompact hook, the finish from the compact_boundary message with the
token count, both durable so a reload or a reconnect still sees them.
Tool rows open themselves while they run and hold for five seconds after their
result, so the inputs are on screen at the moment the call is made rather than
after the fact. The clock lives outside React, keyed by tool call id: rows are
virtualised, so unmounting is not the call ending, and a fast call can render its
start and its result together — a row that only opens when it catches the pending
state never opens for exactly the quickest calls. A click outranks the clock for
as long as the row lives. A failure behaves identically and differs only in colour,
so it stays findable by scanning and nameable in conversation.
Shell logs move off the green-on-black pre onto the shared code surface, which is
the one block that had no copy button and the one you most often want to hand to
someone else.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
officer's registration socket silently drops sends when it isn't OPEN
(sidecar/connect.ts:send — no queue, no error, no return value). the agent pushed
raw parser events over that socket and officer translated and persisted them, so
everything a turn produced while officer was restarting went nowhere: the turn kept
running, the output was gone, and a reconnecting client replayed a log that simply
had no rows for those seconds. stage 1 kept the agent alive across a restart; this
is what makes its output survive one too.
move the translation and the write into the sidecar:
- turn-stream.ts is the stateful ChatEvent -> browser-message translator lifted out
of websocket.ts (delta buffering, flush before tool:start and result). pure and
synchronous, so it is unit tested — 12 tests, 100% lines.
- session-log.ts commits each message to chat_session_events and only then hands it
to officer, with its cursor id attached. per-session promise chain: translation is
synchronous and therefore in arrival order, and only the commit is queued, so
cursor ids are assigned in the order events actually happened. a delta that
overtook the assistant:text in front of it would make the client commit its stream
buffer at the wrong point, so deltas go through the same queue even though they are
never written.
- claude:event on the wire becomes claude:message: a finished browser-facing message
plus its seq. officer relays it verbatim and folds it into the in-memory session
for sync:messages. it no longer builds or persists chat messages for this harness.
gap detection, which is what the durable log is for. chat_session_events.id is a
global bigserial, so two consecutive events of one session are not consecutive ids
and a client cannot tell a contiguous replay from one with a hole in it. each durable
message now carries prevSeq — the cursor of the previous message in the same session —
which is inside the persisted payload, so it survives replay. useChat compares it
against the cursor it holds before advancing, and surfaces a visible marker on a
mismatch: a conversation that silently skips a tool call or half an answer reads as
the assistant having done something inexplicable. only checked once a cursor exists,
because opening a session from history legitimately starts mid-chain (events are swept
after 7 days, the transcript is not).
a failed write delivers live with no seq, so the client sees the message but does not
advance past something it cannot replay, and the next successful write chains from the
cursor the client still holds.
pipeline steps pass durable: false. their sessionKey is a throwaway uuid no browser
will ever replay and the job's own event log is its record, so writing those rows only
grows the table.
opencode still goes through officer's createEventHandler, now labelled as such. that
is the sidecars-opencode branch.
this fixes R4 from CLAUDE_SIDECAR_ISOLATION.md. R3 and R5 already worked.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
pastilhasandClaude Opus 5