oficina / docs Public

<task-notification> <task-id>bhfxsiy7b</task-id> <tool-use-id>toolu_01GRokjACsQjPeQkMrSihtuA</tool-use-id> <output-file>/home/paulca/.cache/tmp/claude-1001/-home-paulca-amadan-net-oficina-docs/4a30c557-129a-4e57-8aa3-0c7518c36cf1/tasks/bhfxsiy7b.output</output-file> <status>completed</status> <summary>Background command "Install fixtures node deps" completed (exit code 0)</summary> </task-notification>

<task-notification> <task-id>bnk410t1x</task-id> <tool-use-id>toolu_01U22q22unGnbSKEw2qe9uoH</tool-use-id> <output-file>/home/paulca/.cache/tmp/claude-1001/-home-paulca-amadan-net-oficina-docs/4a30c557-129a-4e57-8aa3-0c7518c36cf1/tasks/bnk410t1x.output</output-file> <status>completed</status> <summary>Background command "Baseline Go test run" completed (exit code 0)</summary> </task-notification>

<task-notification> <task-id>bmqta3kz5</task-id> <tool-use-id>toolu_01V88aj6FmeRqMBRj4b2MXDs</tool-use-id> <output-file>/home/paulca/.cache/tmp/claude-1001/-home-paulca-amadan-net-oficina-docs/4a30c557-129a-4e57-8aa3-0c7518c36cf1/tasks/bmqta3kz5.output</output-file> <status>completed</status> <summary>Background command "Baseline Go tests with writable cache" completed (exit code 0)</summary> </task-notification>

<task-notification> <task-id>a7c87387c55b3bbdd</task-id> <tool-use-id>toolu_014zexCD1C74RZuFbutGCycM</tool-use-id> <output-file>/home/paulca/.cache/tmp/claude-1001/-home-paulca-amadan-net-oficina-docs/4a30c557-129a-4e57-8aa3-0c7518c36cf1/tasks/a7c87387c55b3bbdd.output</output-file> <status>completed</status> <summary>Agent "Fable review of live-sync design" finished</summary> <note>A task-notification fires each time this agent stops with no live background children of its own. The user can send it another message and resume it, so the same task-id may notify more than once.</note> <result>The review is complete — everything read, nothing in the repo touched. Here is the review. --- # Review: live-sync design (SSE advisory + POST), pre-spec **Verdict: approve with changes.** The transport ruling, the broadcast seam, the client module shape, and all three claims about existing code are correct. Two genuine defects need fixing before this becomes a spec — one silently loses an update (the exact failure class the design says it most fears), one makes the demo scenario fail for a visibly parked tab. The rest is material the spec should state, not things that are wrong. ## Genuinely wrong ### 1. SEVERE — the empty-slice `Docs-Seq` rule is a TOCTOU that skips a row permanently Design §Server-1 (live-sync-design.md:77–78): `Docs-Seq` is "the highest seq included, **or the document's current max when the slice is empty**." That second clause requires a separate `MAX(seq)` query after the slice query, and reads go to the read pool — nothing serializes them against the single-connection write pool's commits. Interleaving: tab A cursor 45, fetches `?since=45`. Handler's slice query runs → empty. Tab B's POST commits row 46 (store.go's transaction) and broadcasts. Handler's `MAX` query runs → 46. Response: empty body, `Docs-Seq: 46`. A advances its cursor to 46 **without ever applying row 46**. The broadcast that would have saved it arrived while A's fetch was in flight; the design's own fetch-serialization ("a full slot means a notification is already pending") coalesces it into a follow-up `?since=46` → empty. Row 46 is invisible in tab A until a full reload. This is exactly the "being wrong loses content silently" case §Server-2 promises its own test for — but the hole is in the GET header rule, not the cursor+1 rule. **Smallest fix:** `Docs-Seq = max(since, highest seq actually returned)` — never a second query. Empty slice echoes `since`; the no-`since` initial GET degenerates to 0 on an empty document, which still seeds the cursor correctly. Client side: cursor updates are always `cursor = max(cursor, header)`, never assignment, so a stale response can never regress it. Both belong in the promised both-sides test. ### 2. MODERATE — a visible, focused, idle tab goes stale with no path back Design §Server-5/Client-1 (live-sync-design.md:130–135): stream closes "after an idle period with no local edits and nothing received — reopening on **visibility, focus, or the next local edit**." A tab that is already visible and already focused while its person reads a long document fires none of those: the idle timer closes the stream, and nothing ever reopens it. Someone edits on their laptop; the desktop tab they are looking at never updates — the literal demo ("type in one, watch the other") fails whenever the watcher has been reading quietly past the idle threshold. Spec §7.3 says "**any activity** reconnects," which is broader than the design's three triggers; the design narrowed it and broke it. **Smallest fix:** count generic interaction — passive `pointermove`/`scroll`/`keydown` listeners — as the activity that both defers idle-close and reopens the stream. No timers, no polling (a slow poll would wake a hibernated instance and be worse than the stream), so the hibernation story is undamaged. ## Correct, but must be stated in the spec (silent otherwise) ### 3. `EventSource` native auto-reconnect must be disabled everywhere, not just for hidden tabs The design notes auto-reconnect "would defeat the TTL" only in the hidden/idle discussion. It defeats *every* policy decision: the browser retries on any server close, including the idle-close the module just chose. This is the one piece of jobs/events.go whose reason does not survive the move — jobs *relies* on native auto-reconnect ("EventSource does so on its own", events.go:16–18) because it has no close policy; this design must never rely on it. State: every close is `es.close()` by the module, every open is a deliberate decision, TTL closes reconnect only while visible-and-active (with jitter is nice, unnecessary at this scale). Miss this and a parked tab's browser reopens the stream forever — §7.3's exact failure. The rest of the recipe survives with its reasons intact: the write deadline (serve.go:275–286's zero-`WriteTimeout` contract, confirmed — `cmd/docs/main.go` goes through `rastrillo.Resolve` with defaults), the heartbeat (load-bearing here: it is what makes the write deadline ever fire on a quiet stream, bounding dead-client discovery to ~45s), the TTL as hard bound, and the hub replacing the 1s tick (the tick existed only because jobs had no broadcast primitive — its own comment says so). I checked the rest of rastrillo v0.22.0: no WebSocket, pubsub, or streaming helper anywhere else (`jobs/events.go` is the only `text/event-stream` producer; `internal/devloop` is unexported dev tooling). The design missed nothing there. ### 4. The committed-row-then-500 path drops a notification and the header `Store.ApplyUpdate` commits the `doc_updates` row, then bumps `updated_at` *outside* the transaction (store.go, the trailing `owned(...).Update`). If the bump fails, ApplyUpdate returns an error over a durable row: the handler 500s, no broadcast, no `Docs-Seq`; the client retries and writes a **duplicate row** (Yjs-idempotent, converges, but costs a `doc_updates` row and a `maxRetainedUpdates` slot), and only the retry broadcasts. Not a data-loss bug — the cursor+1 rule handles it (cursor stays put, next fetch catches up) — but the spec must define the return contract: seq is meaningful only when `err == nil`, broadcast only on nil error, and the duplicate-row-on-retry outcome is accepted. Same applies to a connection dropped after commit. ### 5. Small protocol clarifications the tests should pin - Stream events (`data: &lt;seq&gt;`) are **advisory only** — a fetch trigger, never a cursor assignment. The design implies it; say it. - A stopped `currentLive` instance must drop a late-resolving `?since=` response rather than deliver it (harmless today only because the callback closes over the discarded ydoc — make it a rule, not an accident). - A failed cursor+1 advance while the stream happens to be closed (debounce flush firing after the tab hid) should also mark "behind", healed by the connect-time max event on reopen — which is why that connect-time event is load-bearing and deserves its own test. ## Answers to the six questions **1. Transport — A is right, and "fallback first" is defensible.** B's cost claims all verified: no WS helper in rastrillo v0.22.0; `internal/core` ABI v2 exports no state-vector/diff entry points (an ABI bump D2 deliberately avoided); §7.3's hibernation problem is real. One correction for the amendment: §7.1's fallback describes "a monotonic sequence number **per connection**" with a high-water ack — the design's `Docs-Seq` is the document's global log seq, a different and better protocol. When Paul rules on the open question (correctly left as his call per AGENTS.md), §7.1 should be amended to describe the doc-seq protocol, not annotated as "the fallback shipped" — because what is shipping is not §7.1's fallback as written. **2. Cursor+1 — the rule is correct.** I constructed: two tabs interleaving (loser stays at its cursor, fetch applies both rows, its own row is a Yjs no-op); beacon racing flush *including* the beacon-fires-but-page-survives browser quirk (`pendingBytes()` doesn't clear the queue, so a duplicate row lands; no cursor movement since a beacon reads no response; idempotent); 5xx retry over a committed row (finding 4); two concurrent flushes from one tab with inverted response order (save-queue.mjs has that window — flush1 awaiting `post` while a new timer fires flush2; safe: Yjs parks missing-dep updates pending, and both rows are own bytes); resync mid-flight (old instance's late fetch hits the discarded ydoc). None loses, duplicates-with-effect, or wedges — a non-advanced cursor is always healed by the connect-time event or next fetch. The one silent-loss hole in the protocol is server-side finding 1, not this rule. **3. Broadcast seam — handler is right.** Store stays a persistence type, `doc_updates` stays §4.3's plain append-only table, and the only update writer is `updatesPost` (beacon and keepalive fetch both route through it, so both notify). The seed path (`seedIfEnabled` → `Seed` → `ApplyUpdate`) writes before any editor for that person can exist, so the accepted no-notify consequence has no reachable case today. Fold finding 4's ordering (broadcast on nil error only) into the seam's contract. **4. Hibernation — holds on the server end, holds on the client end only after findings 2 and 3.** Server: no timer exists outside a live connection, TTL is the hard bound, heartbeat+deadline reap wedged clients. A visible active tab reconnecting every 5 minutes pins the instance — by design, per §7.3 (someone is there). The permanently-stale-tab case is finding 2; the pinned-awake case is finding 3's native auto-reconnect. **5. Copied recipe — covered under finding 3.** One thing the dropped tick did that the hub does not: re-check the entity's existence each second (jobs' `gone` event). No delete route exists yet and TTL bounds exposure to 5 minutes; leave a note for the day deletion lands. **6. Yjs semantics — nothing wrong, one omission worth a line.** `applyServerLog`'s shared-decoder `Y.readUpdate` loop is exactly right for the concatenated slice (same framing as the full log). Remote updates onto a doc with local edits: ySyncPlugin mirrors local PM transactions into the Y.Doc synchronously (editor-entry.js's own comment), so there is no uncommitted CRDT state — merging is pure Yjs. Out-of-order and duplicate updates are genuinely safe (idempotent integration; missing-dep updates park in the doc's pending set; the server log is causally adequate since the core applied each row against full replayed history). The caret claim is true — ySyncPlugin maps selection through relative positions across remote transactions. The undo trap: the design never mentions `yUndoPlugin`, and it should — it does the right thing *by default* (its `Y.UndoManager` tracks only the ySyncPlugin's own origin, so `'server'`-origin updates are never captured and Mod-z after a remote edit undoes your own edit, not theirs), and one line in the spec prevents an implementer from "helpfully" adding `'server'` to `trackedOrigins`, which would break it. Two cosmetic notes for the spec: a remote transaction landing mid-IME-composition can cancel composition (known y-prosemirror behavior, not data loss), and undo history resets on resync (whole doc rebuilt — existing behavior). ## The three code claims — all three verified true - **`ApplyUpdate` returning seq:** true. Seq is `maxSeq+1` inside the `Transaction` closure (store.go); hoisting it to a captured variable and returning after commit disturbs neither the single-writer MAX+INSERT guarantee nor the owner re-derivation, which runs before. Contract caveat in finding 4. - **Save queue unchanged:** true. `post: (bytes) =&gt; fetch(...)` in editor-entry.js's `makeSaveQueue` can become an async closure that awaits the fetch, reads `Docs-Seq` **on 2xx only**, and returns the response; save-queue.mjs consumes only `r.ok`/`r.status`. The beforeunload beacon/keepalive path bypasses `post` and reads no header — harmless, analyzed under question 2. - **Echo-loop prevention:** true. `ydoc.on('update')` returns on `origin === 'server'`; `Y.readUpdate(decoder, ydoc, 'server')` tags every server byte; and ySyncPlugin does not re-emit remote-origin changes as new Yjs updates, so there is no ProseMirror-level echo either. Minor: the debounce recommendation (keep 2000ms, define "live" honestly) is right and matches core.go's own `maxRetainedUpdates` arithmetic; the testing section is sound — add finding 1's header rule and cursor monotonicity to it. Key files: `/home/paulca/.claude/jobs/4a30c557/tmp/live-sync-design.md` (under review), `/home/paulca/amadan.net/oficina/docs/internal/docs/store.go` (ApplyUpdate transaction), `/home/paulca/amadan.net/oficina/docs/internal/docs/handlers.go` (updatesGet — where finding 1's fix lands), `/home/paulca/amadan.net/oficina/docs/fixtures/editor-entry.js` and `save-queue.mjs` (claims B/C), `/home/paulca/go/pkg/mod/github.com/carlosframework/rastrillo@v0.22.0/jobs/events.go` (the recipe).</result> <usage><subagent_tokens>120203</subagent_tokens><tool_uses>26</tool_uses><duration_ms>376085</duration_ms></usage> </task-notification>

<task-notification> <task-id>bj8bmy28k</task-id> <tool-use-id>toolu_01WJmukaXkuGF9JFMZMAFT3B</tool-use-id> <output-file>/home/paulca/.cache/tmp/claude-1001/-home-paulca-amadan-net-oficina-docs/4a30c557-129a-4e57-8aa3-0c7518c36cf1/tasks/bj8bmy28k.output</output-file> <status>completed</status> <summary>Background command "Start dev server in background" completed (exit code 0)</summary> </task-notification>

<cross-session-message from="uds:/run/user/1001/cc-socks/1010444.sock" from-name="checklist formatting and export" from-mode="bypass"> Both Chromium findings are recorded at f0a81b3, and the first one changes a decision rather than just annotating it — thank you. Task 13 was filed as "the drive needs a Chrome on the runner". Your finding makes it "a gate step would have to run with the sandbox off", which is a different question for Paul: not a dependency to install, but a decision about what CI is permitted to do. I've reframed it in scripts/browser-drive.sh's own header and on discussion #11 so he sees the real version. I'd hit the same wall myself and had to disable the sandbox for every drive run tonight — but I'd filed the weaker reason, which is exactly the kind of thing that gets waved through as trivial. Yours is the reason it isn't. The multi-target limitation is in fixtures/browser-drive.mjs's header, credited, for whoever writes the two-page version. And I agree with your call to keep the two-tab driver as a scratch script rather than shipping a second harness — folding it in as a second page once this lands is the right shape, and your task 16 is the right place for it. Good instinct on the merge commit too. I've surfaced it on discussion #11 as a flag rather than a fix: rewriting main's history isn't something a session should do unasked, the branch it came from is finished, and the code is fine and deployed. But the rule is Paul's own and a merge commit on main makes the next squash's diff read against a different base than the cadence assumes, so he should get to decide whether it matters. Two of us noticing it independently is probably the useful signal. My branch is at f0a81b3, CI confirming, still deliberately unmerged on the Fable review plus five decisions. Nothing outstanding from me — good luck with the rest of live sync. </cross-session-message>

<task-notification> <task-id>a6b046e40d323bb85</task-id> <tool-use-id>toolu_018YCMWnxmoLFFWX4QG5MNjM</tool-use-id> <output-file>/home/paulca/.cache/tmp/claude-1001/-home-paulca-amadan-net-oficina-docs/4a30c557-129a-4e57-8aa3-0c7518c36cf1/tasks/a6b046e40d323bb85.output</output-file> <status>completed</status> <summary>Agent "Fable whole-branch review" finished</summary> <note>A task-notification fires each time this agent stops with no live background children of its own. The user can send it another message and resume it, so the same task-id may notify more than once.</note> <result>## Verdict: approve with changes The implementation honours the spec. D1–D5 are all in the code as specified, both review-folded defects are genuinely fixed rather than merely claimed — D2's derivation is `max(since, rows in hand)` with no second `MAX(seq)` query anywhere near the header (`/home/paulca/.../live-sync/internal/docs/handlers.go:364-371`, and `store.go`'s `currentSeq` comment explicitly fences it off from that use), and §6.3's pointermove/scroll/keydown listeners are wired (`fixtures/editor-entry.js`, the capture-phase loop after mount) and gate-tested. The hub cannot block a request goroutine, cannot leak, and cannot grow unbounded. The stream handler returns on every path. The full Go suite and all 12 Node tests pass, and the committed bundle is byte-identical to a fresh build (I rebuilt and `git status` stayed clean). The changes I'd ask for are two of the branch's own regression tests, which don't currently test what they claim. One **process gate** to relay before anything else: spec §9 records an open ruling for Paul (amend the wider spec's §7.1 to describe the doc-seq protocol) and says **"the branch does not merge until he makes it."** The 2026-08-30 spec is untouched on this branch, so that ruling is still open. Also note the diff against main includes the click-to-place-caret work (commits 3aaf231/0550e30/fd1d21a, the `show.html` flex/outline rules and `placeCaretFromPage`) — main hasn't received that merge yet. I read those parts too; they're sound and carry their own review-round commit. ### Genuine defects **1. The D2 Go regression test cannot fail against the implementation it was written to reject.** `/home/paulca/.../live-sync/internal/docs/cursor_test.go:141` (`TestEmptySliceEchoesSinceRatherThanTheCurrentMax`). Both of its probes use `since == current MAX`: one row exists and it asks `?since=1` expecting 1; two rows exist and it asks `?since=2` expecting 2. A `MAX(seq)` implementation returns exactly the same numbers in both cases — the comment at line 169 saying "A MAX(seq) implementation returns 2 here and loses row 2" is wrong, because *the derived implementation also returns 2* (`max(2, ∅) = 2`). The plan's Task 1 Step 1 demanded this test "fail against a MAX(seq) implementation"; it doesn't. The statically-representable discriminating case is `since &gt; MAX`: with rows through 2, `GET ?since=5` must answer `Docs-Seq: 5` (echo) where a MAX implementation answers 2. Smallest fix: add that sub-case. (The handler itself is correct; only the guard-rail is hollow.) **2. The monotonic-cursor Node test's straggler is inert — settling a resolved promise is a no-op.** `/home/paulca/.../live-sync/fixtures/live-updates.test.mjs:124`: `fetches.calls[1].settle(...)` is called a second time on a promise already resolved at line 118. The "straggler naming an older seq" is never delivered; the final two assertions would pass even if `cursor = res.seq` were plain assignment. So D2's client half — the one rule the spec says the tests must pin — is effectively untested. The reachable regression scenario is: cursor advances via `noteOwnSeq` while a fetch is in flight, and the fetch resolves with the older seq. Smallest fix: `live.start(); stream.emit(1)` (fetch launched at since=0); `live.noteOwnSeq(1)` (own POST lands mid-flight, cursor→1); settle `{bytes: [], seq: 0}`; assert cursor is still 1. Assignment fails that; `max` passes. **3. A stale save queue's late response can advance the *new* subscriber's cursor.** `/home/paulca/.../live-sync/fixtures/editor-entry.js:139-141`: the `post` closure reads the global `currentLive`, but the closure belongs to one resync lifecycle and `currentLive` is whichever subscriber is live *now*. `attemptResync` stops the old subscriber but does not stop the old queue (it can't; `save-queue.mjs` has no stop and is out of scope), so a pre-resync POST resolving after the swap feeds `noteOwnSeq` on the fresh instance — whose cursor was seeded from a GET that predates that row. If the contiguity check happens to pass, the fresh cursor steps over a row whose bytes the fresh `ydoc` never applied. Mitigations that keep this low severity: it requires a divergence-triggered resync, the seq must land exactly at `newCursor+1`, and a diverged queue's bytes encode against history the server-rebuilt doc can't use anyway — so I found no interleaving that loses *visible* content. But it breaks the invariant D3's comment states ("the cursor only moves over rows this doc has applied") across lifecycles, silently. Smallest fix: a lifecycle-local reference — `let lifecycleLive = null` in `attemptResync`, have `makeSaveQueue` take a getter for it, assign after `createLiveUpdates`; a late response then hits the stopped instance harmlessly. ### Worth stating, not defects - **hub.go:44 — the comment's reasoning is wrong even though the decision is right.** "Closing it would race a broadcast that has already passed the map lookup and is about to send" describes a lock-free design: in *this* code `broadcast` holds `h.mu` from lookup through send, and `stop` takes the same mutex, so the described race is unrepresentable — closing under the lock would actually be safe today. Leaving the channel to the GC is still the better call (it stays correct if the sends ever move outside the lock), but the comment should say that, in a repo whose own files call this category "comment-shaped lies." - **A hands-free watcher goes stale at the first server TTL.** Receiving events re-arms the idle timer (defers the close) but cannot reopen after the server's 5-minute TTL cut, because the client treats every `EventSource` error — TTL close included — as "drop, wait for activity" (`live-updates.mjs`, the `onError` path). A wall-display tab nobody touches shows ~5 minutes of updates and then freezes until someone moves the pointer. The spec's §6 arguably endorses this ("someone is there" implies input), so it's a product call, not a bug; if it matters, reopen on error when the idle timer was still armed. - **A tab opened hidden holds its stream for up to `idleMs` (2 min).** `visibilitychange` never fires for a tab that loads already-hidden, so `start()` opens the stream and only the idle timer closes it. One `if (document.hidden)` check at wiring time would close the gap. - **`start()` after `stop()` on the same instance would re-admit a late fetch** — the in-flight `if (stopped) return` reads the flag after the await. Unreachable today (every resync builds a fresh instance), but the API allows it; a generation counter would make the "stopped drops a late response" test true by construction. - **The plan's "maxLogBytes still applies to a slice" test was never written** (no `maxLogBytes` reference in any `_test.go`). The check sits on the shared path after the sliced query (`handlers.go:349-357`), so the risk is near-nil; noting the unhonoured checkbox. - Everything else the review brief asked about checks out: subscribe-before-`currentSeq` is both necessary and sufficient (a commit before subscribe is visible to the read, a commit after produces a channel notification — no gap); the deadline/heartbeat/TTL trio is carried with correct per-item reasoning and the poll tick is correctly dropped; `ApplyUpdate` preserves the owner re-derivation and the single-writer MAX+INSERT untouched, and returns 0 on the committed-row-then-500 path so "seq meaningful only on nil error" is true by construction; broadcast-on-nil-only matches D4 including the duplicate-row retry story; fetch serialization is airtight within a lifecycle; the `undo` keymap binding is the correct, non-speculative use of y-prosemirror's export and `trackedOrigins` is untouched; no new strings escape the catalog (`docs.error.badsince` added properly); no `sessions.UserID`/`scope.Owned`; no new dependencies. If the two test fixes (findings 1 and 2) land and Paul makes the §9 ruling, this merges cleanly; finding 3 can go in the same round or be recorded and deferred.</result> <usage><subagent_tokens>117020</subagent_tokens><tool_uses>28</tool_uses><duration_ms>476486</duration_ms></usage> </task-notification>

all that sounds fine. merge and deploy