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perf(server): ACP tool updates no longer persist a snapshot per streamed chunk - #16682
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…med chunk AcpAdapterV2 handles session/update itself, so pingdotgg#7279's decideToolCallUpdateEmission gate in AcpSessionRuntime never ran for V2. Gate unprojected emitTool writes through it; context.tools still merges every update so terminalization writes the latest state. Refs pingdotgg#16428
Normalizers can project a mid-turn completed as running; the gate must still write it, as V1 did, instead of treating it as a duplicate.
…ize on skips Devin routes subagent tool calls through the child-session branch, which wrote turn_item.updated directly. Share the gate with emitTool, and keep rearming deferred finalize when emitTool skips a write.
…rguments V2 shows command and monitor output as it arrives (the Grok replay fixtures assert every tick), so only argument-only updates such as a streamed diff or rawInput go through the pingdotgg#7279 rule.
| reportedStatus === "completed" || | ||
| reportedStatus === "failed" || | ||
| emission === undefined || | ||
| progressLength !== emission.lastEmittedDetailLength |
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🟡 Medium Adapters/AcpAdapterV2.ts:1489
Running command stdout and monitor output changes are not persisted immediately when their visible text changes without increasing toolCallProgressLength—for example, replacing tick 1 with tick 2—so the UI misses live updates until decideToolCallUpdateEmission reaches its threshold. This comparison uses only the maximum of the detail, content, and raw-output lengths; compare the visible output itself (or its components) so these updates are emitted promptly.
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In file @apps/server/src/orchestration-v2/Adapters/AcpAdapterV2.ts around line 1489:
Running command stdout and monitor output changes are not persisted immediately when their visible text changes without increasing `toolCallProgressLength`—for example, replacing `tick 1` with `tick 2`—so the UI misses live updates until `decideToolCallUpdateEmission` reaches its threshold. This comparison uses only the maximum of the detail, content, and raw-output lengths; compare the visible output itself (or its components) so these updates are emitted promptly.
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Fixed in dbec3e2. The gate now compares the visible text itself (toolCallVisibleOutputChanged: detail, text content, rawOutput text), not its length. The test streams a running command whose output is replaced tick 1 → tick 5, all the same length. With the previous length check it failed with tick 2 must persist; it passes now.
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ApprovabilityVerdict: Not approved Macroscope's review found this PR not approvable — This production change throttles persisted ACP tool updates across both root and child sessions, altering existing event-log and live-update behavior based on heuristic length and status checks. An unresolved finding also identifies delayed persistence for same-length visible-output replacements, so the emission semantics need human validation. Not approved because:
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Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 7 remain after this review. 📝 WalkthroughWalkthroughThe ACP adapter now filters persisted tool updates for root and subagent turns. It persists terminal updates, first updates, changes to status, title, or visible output, and periodic updates. Tests cover streamed root and child file writes and same-length output replacements. ChangesACP tool update persistence
Priority: ⬆️ High Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix · Severity of issue fixed: High Suggested reviewers: Merge Risk: ⚪ Minimal · up to The change bounds repeated ACP snapshots while retaining meaningful and terminal updates; the supplied integration coverage checks root and child streams. No actionable merge-blocking risk remains. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The change reduces redundant saved tool snapshots without changing execution permissions. Terminal tool reports still save immediately. No introduced security issue was established, but intermediate-state recovery and downstream display behavior are not fully verified. Retained concerns Security review detailsSecurity Blast Radius
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Resolution Preserve the agent-reported status before flavor normalization and pass it to ✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
Review comments at @apps/server/src/orchestration-v2/Adapters/AcpAdapterV2.ts:
- Around line 1489-1491: Update the emission decision around progressLength and
decideToolCallUpdateEmission to compare the current string-valued rawOutput with
the last emitted visible output before applying the argument-only rule. Emit
whenever visible output changes, including same-length changes, even if
toolCallProgressLength remains zero.
- Around line 1491-1496: Update the unchanged check used by
decideToolCallUpdateEmission to also compare previous.data.rawInput with
next.data.rawInput. This ensures rawInput-only changes count toward
skippedSinceEmit and trigger emissions at the existing coalescing limit;
preserve the current content and rawOutput checks.
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Compare visible output text instead of its length, so same-length replacements and string rawOutput persist. Count every skipped update, including rawInput-only ones, toward the every-10th write. This replaces the reuse of decideToolCallUpdateEmission with a V2 rule.
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Inline comments:
Review comments at @apps/server/src/provider/acp/AcpRuntimeModel.ts:
- Around line 1017-1019: Update the visible-output collection using
RAW_OUTPUT_TEXT_FIELDS so record-valued rawOutput.text is included when
rawOutput has type "Text"; compare its text value before applying the
skipped-update interval.
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Grok sends { type: "Text", text } output, which the field list missed.
Comparing the whole rawOutput covers every shape; streamed arguments
never change it.
## What's Changed * feat(providers): run Muse Code as a native provider by @t3dotgg in pingdotgg/t3code#17082 * feat(web): compact-before-send is a chip that shows the token count by @t3dotgg in pingdotgg/t3code#17127 * fix(clients): copy button is back in its old spot, before fork by @t3dotgg in pingdotgg/t3code#17137 * fix(usage): repeat usage scans no longer decode unchanged Antigravity databases by @t3dotgg in pingdotgg/t3code#17139 * fix(server): shell snapshots no longer block other database reads while decoding by @t3dotgg in pingdotgg/t3code#17141 * perf(server): ACP tool updates no longer persist a snapshot per streamed chunk by @darjss in pingdotgg/t3code#16682 * feat(web): filter the Usage page to just the providers you want by @t3dotgg in pingdotgg/t3code#16970 * fix(usage): Cursor account history loads about 4x faster by @t3dotgg in pingdotgg/t3code#17140 * fix(server): threads settle as soon as branch status sees their PR merge by @t3dotgg in pingdotgg/t3code#17148 * perf(usage): the Usage page shows numbers in under a second and dims only what is still loading by @t3dotgg in pingdotgg/t3code#17147 * fix(server): an agent can settle its own thread when its turn ends by @t3dotgg in pingdotgg/t3code#17145 * feat(web): Add provider button sits with the provider list by @t3dotgg in pingdotgg/t3code#17152 ## New Contributors * @darjss made their first contribution in pingdotgg/t3code#16682 **Full Changelog**: pingdotgg/t3code@v0.0.46-nightly.20261008.2813...v0.0.46-nightly.20261008.2819 Upstream release: https://github.com/pingdotgg/t3code/releases/tag/v0.0.46-nightly.20261008.2819
## What's Changed * feat(providers): run Muse Code as a native provider by @t3dotgg in pingdotgg/t3code#17082 * feat(web): compact-before-send is a chip that shows the token count by @t3dotgg in pingdotgg/t3code#17127 * fix(clients): copy button is back in its old spot, before fork by @t3dotgg in pingdotgg/t3code#17137 * fix(usage): repeat usage scans no longer decode unchanged Antigravity databases by @t3dotgg in pingdotgg/t3code#17139 * fix(server): shell snapshots no longer block other database reads while decoding by @t3dotgg in pingdotgg/t3code#17141 * perf(server): ACP tool updates no longer persist a snapshot per streamed chunk by @darjss in pingdotgg/t3code#16682 * feat(web): filter the Usage page to just the providers you want by @t3dotgg in pingdotgg/t3code#16970 * fix(usage): Cursor account history loads about 4x faster by @t3dotgg in pingdotgg/t3code#17140 * fix(server): threads settle as soon as branch status sees their PR merge by @t3dotgg in pingdotgg/t3code#17148 * perf(usage): the Usage page shows numbers in under a second and dims only what is still loading by @t3dotgg in pingdotgg/t3code#17147 * fix(server): an agent can settle its own thread when its turn ends by @t3dotgg in pingdotgg/t3code#17145 * feat(web): Add provider button sits with the provider list by @t3dotgg in pingdotgg/t3code#17152 ## New Contributors * @darjss made their first contribution in pingdotgg/t3code#16682 **Full Changelog**: pingdotgg/t3code@v0.0.46-nightly.20261008.2813...v0.0.46-nightly.20261008.2819 Upstream release: https://github.com/pingdotgg/t3code/releases/tag/v0.0.46-nightly.20261008.2819
Problem
V2 writes every streamed ACP
tool_call_updateto the event log as a fullturn_item.updatedplus anode.updated. Agents that stream tool arguments resend the whole call so far each time, so log growth is quadratic. A Devin file write of 4.5 KB is 1,156 updates. On my server,turn-item.updatedandnode.updatedwere 95% of the 3.68M rows in a 17.8 GBstatev2.sqlite. Details and the raw capture are in #16428.V1 bounded this in #7279 (
decideToolCallUpdateEmission), but that gate only filtersAcpSessionRuntime's event queue.AcpAdapterV2registers its ownhandleSessionUpdatehandler, so neither its root path (emitTool) nor its child-session path goes through any gate.Change
shouldPersistToolUpdateinAcpAdapterV2.tswrites a streamed tool update when any of these hold:toolCallVisibleOutputChangedinAcpRuntimeModel.tscompares the detail, the text content blocks, and the wholerawOutput, so every output shape counts (a string,stdoutfields, Grok's{ type: "Text", text });completedorfailed;So streamed arguments (a
diff,rawInput) persist every 10th update, while command and monitor output still persists on every change, as onmain. V2 shows that output live, and the Grok replay fixtures assert that every tick persists while running. I started by reusing #7279'sdecideToolCallUpdateEmission. Its 256-char growth threshold hid those ticks, and its "nothing changed" check skippedrawInput-only updates without counting them, so this is a smaller V2 rule.Both write paths use it:
emitTool). The adapter still merges every update intocontext.toolsand runs the background, hydration and subagent bookkeeping. Only thenode.updated/turn_item.updatedoffers are skipped, and a skip still callsrearmDeferredFinalize.parentAgentId. It gets the same gate, keyed by itsnativeTaskId:tool:idkey.projectedStatusskip the gate, so turn-end terminalization still writes the latest merged state, includinginterrupted. An agent-reportedcompletedorfailedalways writes, even when a flavor normalizes it to a non-terminal status (Grok's mid-turn Bashcompletedbecomesrunning).context.toolUpdatesSkippedcounts skips per tool next to the merged tools.Not changed:
decideToolCallUpdateEmissionand the V1 runtime path.ProviderTextDeltaCoalescer(perf(server): stop re-emitting whole assistant text on every delta #15767).ThreadLiveEventCoalescer(fix(server): coalesce tool output before it fills the live buffer #16317).Each kept snapshot of a file write still holds the whole file, so very large writes still grow the log, by about a tenth of what they did before. Storing diffs instead of snapshots would be a bigger change, so I left it out.
Scope and approval
Fixes #16428. The triage comment there confirms the bug on
mainand lists the details this PR follows: skip only the offers, rearm finalize, bypassprojectedStatus, keep emission state beside the tool, and gate the child-session branch.Verification
New test in
AcpAdapterV2.test.ts: "persists a bounded subset of streamed root and child tool updates". It uses the Devin flavor (normalizeDevinSessionUpdate/normalizeDevinToolCall/extractDevinSubagentUpdate). In one turn it streams a 4.8 KB file write as 1tool_call+ 200 growingtool_call_updates +completed, once from the root agent and once from a subagent viacognition.ai/subagent_context.main(bfec2387b8)mainthe test fails:root-write: expected 202 to be at most 40.child-write: expected 202 to be at most 40.completedand contains the end of the file.tick 1→tick 5(a stringrawOutput) andtock 1→tock 5({ type: "Text", text }), all the same length. Every tick must persist. Earlier versions of this PR failed withtick 2 must persist(length check) andtock 2 must persist(field list).vp test run src/orchestration-v2/ src/provider/acp/inapps/server: 124 files, 2,224 passed, 18 skipped. Before the live-output change in this PR, three Grok replay fixtures (grok_monitor,grok_background_bash,grok_background_bash_fast_wake) failed with "completed before tick 2"; they pass now.vp exec tsc --noEmit -p .inapps/server: exit 0vp linton both files: no new warnings.vp run knip:check: exit 0I also captured raw ACP traffic from Devin CLI 3000.11.3 with T3's initialize capabilities. The same prompt sends 1,156
tool_call_updates withcognition.ai/messageGroupingand 3 without it.Not checked: a live Devin session through a full T3 server build with this patch. The test feeds Devin-shaped updates through the real adapter, but not a live CLI.
Model/harness: Claude Opus 5.5 via Claude Code.