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fix(acp): bound unread notification retention by size - #23217
ACP connections retain the last 32 raw notifications even when nothing reads them. On main, the reporter's synthetic run of 40 notifications with 8 MiB strings retained about 256 MiB per connection; 100 notifications of 1 MiB plateaued at 32.2 MiB.
Change
Bound the unread raw-notification backlog by both the existing 32-message cap and 16 Mi UTF-16 characters of JSON lines. Evict oldest notifications first while preserving the newest, including an oversized newest notification. Carry the line length from the existing parser to avoid serializing payloads again; subtract it when a raw reader consumes an item. Pull one notification at a time so a slow reader leaves the remaining notifications eligible for eviction.
Triaged bug via the automated issue flow: #18799. The change is confined to protocol buffering and its regression test.
Verification
Regression test fails on base: 32 unread notifications held: expected 33555127 to be at most 16777216.
Latest local head: all 64 effect-acp tests passed across 6 files, including 23 protocol tests. Package typecheck, scoped lint and formatting pass (one existing lint warning at test line 500).
Slow-reader regression: before the singleton-pull fix, delivery was [1,2,3,4,5]; after, [1,3,4,5]. Deferred gates block handler 1 while 6 Mi-character notifications accumulate; notification 2 remains evictable. Both independent reviewers approved the updated diff.
Package tsc-rs --noEmit, scoped lint, and format checks pass.
Lead’s initial synthetic 8 MiB run: 256.2 MiB retained before, 8.2 MiB after at 32 notifications. The fresh evidence run measured 3.2 MiB at that checkpoint; GC changes individual samples, and the deterministic backlog assertions establish the bound. Synthetic 1 MiB run: 32.2 MiB before, 15.2 MiB after at 100 notifications.
Real-app attempt: isolated web dev server, Linux x86_64 / Node 24.21.0, browser-started local synthetic ACP provider. Large unread extension notifications increased retained server heap; the runtime transcript records attempts and limitations.
Evidence pins reviewed commit c64f3d8d47 against 70e5e384da. Prior merge commit b89efe5447 has byte-identical effect-acp sources and tests. The original proof audit returned SUFFICIENT. Latest reviewed head a6888da01f additionally fixes slow-reader batch retention; its deterministic regression and the 64-test package suite pass. Both fresh independent reviewers returned MERGE. The earlier transcripts cover the original buffering fix; the new slow-reader case is proved by the committed Deferred regression test.
No render path changes; visual fixture matrix is empty. This bounds backlog size, not total process memory; a single oversized newest notification is intentionally retained. Real paid-provider traffic, Electron, Android and iOS were not exercised; they share this server protocol and have no changed UI code.
Models: Claude Opus 5.5 through the Claude harness; GPT-6.1-Sol through the Codex harness in T3 Code.
Macroscope's review found this PR approvable — ACP notification readers now consume one item at a time, keeping unread backlog subject to the existing size limits. The change is confined to transient buffering and leaves notification callbacks and product defaults unchanged.
No code changes detected at 30e352a. Prior analysis still applies.
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Walkthrough
The protocol tracks the JSON line length of notifications still queued. The incoming stream subtracts each notification’s length when it pulls that notification. A regression test checks eviction while the reader is blocked.
The protocol removes the enqueue-time reset of the queued-length total and subtracts each notification’s JSON line length when the incoming stream pulls it. The test blocks the reader on notification 1 and checks that notification 2 is evicted, so the reader receives [1, 3, 4, 5].
The change bounds unread notification retention by size and reads notifications one at a time. No actionable merge-blocking risk remains after review.
Pre-merge checks: 4
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Explanation
Title check
The title "fix(acp): bound unread notification retention by size" matches the main change. The protocol buffering now caps the unread raw-notification backlog by a size limit in addition to the existi…
Description check
The description follows the template sections: Problem, Change, Scope and approval (in place of Scope), and Verification. It gives a clear problem statement with reproduction numbers, explains the siz…
Linked Issues check
Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check
Check skipped because no linked issues were found for this pull request.
Full details: Title check
Explanation
The title "fix(acp): bound unread notification retention by size" matches the main change. The protocol buffering now caps the unread raw-notification backlog by a size limit in addition to the existing 32-message cap, and the change also carries line lengths and pulls one notification at a time. The title is specific and follows conventional commit form.
Full details: Description check
Explanation
The description follows the template sections: Problem, Change, Scope and approval (in place of Scope), and Verification. It gives a clear problem statement with reproduction numbers, explains the size bound, eviction order, and singleton pull, links issue #18799, and reports focused regression tests and results. It also notes what was not checked, including real paid-provider traffic and Electron, Android, and iOS. Two gaps remain. The Scope section does not state a clear reason for the fix beyond the linked issue, and the PR objectives note that PR #19585 already bounds the same queue, which the description does not address. The Verification section also contains a large number of links and mixed evidence runs that a reviewer must sort through. The template's core requirements are still met.
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Actionable comments posted: 1
🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @packages/effect-acp/src/protocol.ts:
- Around line 1024-1026: Replace Stream.fromQueue in the notification stream
with a singleton-pull approach so each stream pull takes and maps only one
queued notification. Preserve the existing bufferedNotificationChars decrement
and notification mapping, ensuring only one in-flight notification can bypass
queue eviction.
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📥 Commits
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packages/effect-acp/src/protocol.test.ts
packages/effect-acp/src/protocol.ts
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…otifications outside the size cap
Stream.fromQueue drains every buffered notification into one batch, so a
reader blocked in a handler kept that whole batch alive past eviction.
Pull one notification at a time so unread ones stay in the bounded queue.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Fixed the slow-reader batch-retention finding in a6888da01f. Singleton pulls leave unread notifications eligible for eviction. The Deferred regression fails before the change and passes afterward; all 64 effect-acp tests and package typecheck pass. Two fresh independent reviews found no blockers.
Thanks for the fix and the regression coverage. #19585, merged as beaeeff40e, already bounds the unread raw notification queue. Could you cut this PR down to the remaining slow-reader fix and its regression test? Main still pulls the whole queue into the stream, so notifications in a slow reader’s batch cannot be evicted; the slow-reader test here fails on main.
… a time
Main already caps unread raw notifications by count and JSON length, but
`incoming` drained the whole backlog into one batch per pull. A reader still
handling an earlier notification held that batch outside the cap, and the
length counter reset as if it had been read.
Pull one notification at a time and subtract its length when it is taken, so
the queue's accounting stays exact and the reader holds at most one.
AI-assisted; verified with the tests and tools listed above.
Emit 1 and 2 (6 Mi characters each), start a diagnostic raw reader blocked handling 1, emit 3 and 4 (6 Mi characters each) and tiny notification 5, then release the reader. Both runs used the real T3 server and local synthetic ACP subprocess with fresh databases and identical instrumentation; protocol.ts was untouched.
The separate 32-message count threshold and single-notification-over-budget behavior were not exercised; this reproduction specifically demonstrates size-budget eviction during slow consumption.
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Problem
ACP connections retain the last 32 raw notifications even when nothing reads them. On main, the reporter's synthetic run of 40 notifications with 8 MiB strings retained about 256 MiB per connection; 100 notifications of 1 MiB plateaued at 32.2 MiB.
Change
Bound the unread raw-notification backlog by both the existing 32-message cap and 16 Mi UTF-16 characters of JSON lines. Evict oldest notifications first while preserving the newest, including an oversized newest notification. Carry the line length from the existing parser to avoid serializing payloads again; subtract it when a raw reader consumes an item. Pull one notification at a time so a slow reader leaves the remaining notifications eligible for eviction.
Scope and approval
Fixes https://git.cafe/pingdotgg/t3code/issues/18799
Triaged bug via the automated issue flow: #18799. The change is confined to protocol buffering and its regression test.
Verification
32 unread notifications held: expected 33555127 to be at most 16777216.effect-acptests passed across 6 files, including 23 protocol tests. Package typecheck, scoped lint and formatting pass (one existing lint warning at test line 500).[1,2,3,4,5]; after,[1,3,4,5]. Deferred gates block handler 1 while 6 Mi-character notifications accumulate; notification 2 remains evictable. Both independent reviewers approved the updated diff.tsc-rs --noEmit, scoped lint, and format checks pass.Red/green transcript · Runtime transcript and reproduction scripts · Empty visual matrix
Real app runtime transcript · Synthetic app peer
Evidence pins reviewed commit c64f3d8d47 against 70e5e384da. Prior merge commit b89efe5447 has byte-identical
effect-acpsources and tests. The original proof audit returned SUFFICIENT. Latest reviewed head a6888da01f additionally fixes slow-reader batch retention; its deterministic regression and the 64-test package suite pass. Both fresh independent reviewers returned MERGE. The earlier transcripts cover the original buffering fix; the new slow-reader case is proved by the committed Deferred regression test.No render path changes; visual fixture matrix is empty. This bounds backlog size, not total process memory; a single oversized newest notification is intentionally retained. Real paid-provider traffic, Electron, Android and iOS were not exercised; they share this server protocol and have no changed UI code.
Models: Claude Opus 5.5 through the Claude harness; GPT-6.1-Sol through the Codex harness in T3 Code.