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fix(server): queued preview actions no longer start after their deadline, except recording stop - #16941
fix(server): queued preview actions no longer start after their deadline, except recording stop#16941hogeheer499-commits wants to merge 13 commits into
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The description includes all required sections and provides detailed problem, implementation, scope, verification, limitations, and test results. However, the Scope and approval section explicitly sta… | Add a link to explicit maintainer approval of this implementation and its scope, including the approval comment. If no approval is required, explain why this focused fix qualifies for the template's exemption. |
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Check name Status Explanation 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. Title check The title clearly and concisely describes the main change: queued preview actions no longer start after their deadlines, with the recording-stop exception stated.
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The description includes all required sections and provides detailed problem, implementation, scope, verification, limitations, and test results. However, the Scope and approval section explicitly states that the linked triage is not approval of this implementation and does not explain why the change qualifies for an approval exemption.
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Superseded (14 Oct). This snapshot-compatibility reply concerned the earlier |
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Tip For best results, initiate chat on the files or code changes. 🧩 Analysis chain🏁 Script executed: #!/bin/bash
set -euo pipefail
git rev-parse HEAD
cat packages/contracts/package.json
rg -n -C2 '\bPreviewAutomationSnapshot\b' .
ast-grep outline apps/server/src/mcp/McpHttpServer.ts --match registerPreviewSnapshot --view expanded
ast-grep outline apps/server/src/mcp/McpHttpServer.test.ts --items all
ast-grep outline apps/server/src/mcp/toolkits/preview/handlers.ts --items all
ast-grep outline packages/contracts/src/previewAutomation.ts --match 'PreviewAutomationSnapshot' --view expanded
gh api repos/pingdotgg/t3code/pulls/16941/comments --paginate --jq '.[] | select(.user.login == "coderabbitai" and (.body | test("compatib|consumer|optional|schema"; "i"))) | {id,path,line,body}'Length of output: 11663 🏁 Script executed: #!/bin/bash
set -euo pipefail
sed -n '451,565p' apps/server/src/mcp/McpHttpServer.ts
sed -n '205,225p' apps/server/src/mcp/toolkits/preview/handlers.ts
sed -n '696,715p' packages/contracts/src/previewAutomation.ts
rg -n -C3 'snapshot|older host|includeImage|saved|outputSchema' apps/server/src/mcp/McpHttpServer.test.ts
git show --format=short --stat c8201d7
git show --format= -- apps/server/src/mcp/McpHttpServer.test.ts
gh api repos/pingdotgg/t3code/issues/16941/comments --paginate --jq '.[] | select(.user.login == "coderabbitai" and (.body | test("compatib|consumer|optional|schema"; "i"))) | {id,body}'Length of output: 30104
The code and tests support these conclusions:
This evidence resolves my concern for the identified consumers and older-host response path. It does not establish compatibility for arbitrary custom consumers. I verified the code and test assertions, not the reported test execution. The maintainer review requirement remains unchanged. ✏️ Learnings added
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Superseded (14 Oct): this describes an earlier, broader revision of this PR. The current scope and evidence are in the PR description. @juliusmarminge The fix for #16921 is ready for maintainer review, based on your merged #16939. CodeRabbit withdrew its snapshot compatibility finding; its remaining Approvability gate requires a maintainer review because the change spans the server and contracts. CI, Mobile Fingerprint Check, Mobile EAS Preview and Web Preview are all Current head: |
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Port pingdotgg#16941, including compatibility and navigation timeout regression tests. Upstream commits: f88dc5f, c8201d7, f07b86a. Co-authored-by: hogeheer499-commits <267467744+hogeheer499-commits@users.noreply.github.com>
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Inline comments:
Review comments at @apps/server/src/preview/ServerBrowser.ts:
- Line 1786: Cap both navigation calls in handleRequest with the remaining
request budget at the time navigation starts, including the call using
navigationTimeout and the call using navigateInput.timeoutMs or
request.timeoutMs. Pass remainingTimeoutMs through runOperation to the open
callback so both paths can apply the cap.
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📒 Files selected for processing (8)
apps/server/src/mcp/McpHttpServer.test.tsapps/server/src/mcp/McpHttpServer.tsapps/server/src/mcp/toolkits/preview/handlers.tsapps/server/src/mcp/toolkits/preview/tools.tsapps/server/src/preview/ServerBrowser.test.tsapps/server/src/preview/ServerBrowser.tsapps/server/src/preview/SessionControl.tspackages/contracts/src/previewAutomation.ts
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Superseded (14 Oct). This reply concerned navigation-budget changes in the earlier |
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I have not independently verified the fix or the reported test results. The maintainer review requirement remains unchanged. If you found this review helpful, would you consider giving us a shout-out on X? Thank you for using CodeRabbit! ✅ Action performedReviews resumed. Review finished.
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Current review map (14 Oct). The earlier, broader proposal in this comment is superseded. The PR description is the canonical scope and verification record.
The earlier text is preserved in this comment's edit history. |
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ApprovabilityVerdict: Approved at Macroscope's review found this PR approvable — This is a narrowly scoped preview-server bug fix that prevents expired queued actions from executing while preserving in-flight work and recording cleanup. The production diff is small, behavior is covered by focused tests, and it introduces no schema, default, infrastructure, or sensitive-package changes. You can add or adjust custom eligibility rules. Learn more. |
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A stop cannot act twice, and rejecting a late one at dispatch left capture running. Cover a stop queued behind a timed-out snapshot with the real broker and control queue.
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Dismissing prior approval to re-evaluate 2c73a63
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Problem
On a server-rendered preview tab, a click queued behind a stalled snapshot can execute after its caller has timed out. Retrying can then click twice. This PR prevents an agent action from starting once its host-side request budget has expired; it does not cancel work already running.
Change
Record
performance.now() + request.timeoutMswhen the in-process host receives the request. Pass that deadline to the existing tab queue and check it immediately before dispatch, after the ownership and epoch checks. An expired action rejects with the existingPreviewAutomationTimeoutErrormapping instead of touching the page.recordingStopremains exempt: a late stop must still stop the capture. Running work retains its queue reservation until it settles, so a stalled capture cannot overlap another one. No timer, wire-contract change or product-default change is added.The production change is confined to
ServerBrowser.tsandSessionControl.ts; the other two files test that same dispatch rule. Much of the displayedServerBrowser.tsdiff is re-indentation around the added argument.Scope and approval
This addresses one consequence of the #16921 triage, posted by Grok on behalf of Julius: server-side work survives caller failure and a stalled snapshot holds the tab queue. The late-click regression is reproduced by the added test; the triage is not approval of this specific implementation.
Current
main@ab3a3cd1still lacks the dispatch deadline check. Merged #19561 changes clipboard copying in the same file and is retained in the tested combination. Open #17871 (host retention) and #18873 (capture/page continuity) are complementary, not dependencies.This does not fix shared-host eviction, the underlying snapshot stall or Cloudflare challenges. Actions that start before their deadline retain their full operation timeout. The deadline starts at host receipt; it is not an end-to-end cancellation signal. A different request can still disconnect a caller before this request's own deadline.
This head supersedes the earlier broad revisions: broker changes and snapshot/MCP defaults are absent from the four-file net diff. Earlier reviews of those revisions are historical. Please squash-merge to take only the final change.
Verification
main@85272eeand fix(preview): keep browser sessions available after action timeouts #17871695f58d): a timed-out queued click, a click exactly at its deadline, and the queue skip while allowing subsequent work. They pass with this patch.2c73a63merges cleanly withmain@ab3a3cd1. In an isolated combination with fix(shared): match Windows home paths case-insensitively in file links #19627 (a1f9d1c, compatibility check only), 54 browser/control tests pass; the shared-path suites also pass (59), for 113 total. Server/shared typechecks, targeted lint, formatting andgit diff --checkpass.vp test run apps/server/src/preview/ServerBrowser.test.ts apps/server/src/preview/SessionControl.test.ts vp run --filter t3 typecheckEarlier compatibility checks and known native-browser test limitation
Earlier combinations with #17871
695f58dand #18873b9fa58fpassed 53 and 62 tests plus typecheck. They used5b4bec9, differing from this head only in a code comment; these are not new current-main measurements.Earlier unchanged
PreviewAutomationBroker/ServerBrowserPagesuites passed 58 tests in 2 of 4 runs. The other two failed inclicks the fifth repeated delete control without touching row onewithProtocol error (Page.captureScreenshot): Unable to capture screenshot. The same test failed on original main85272eein 3 of 6 runs. The new 54-test check uses stubbed Chromium I/O and does not establish that this native capture failure is fixed.Not tested: packaged desktop or native macOS. Fork CI still requires maintainer authorization; local checks do not replace it.
Implemented with GPT-6.1-Sol in Codex. The source was previously reviewed with Claude Opus 5.5 and Claude Fable 5.1 in Claude Code; this description update was prepared with GPT-6.1-Sol in Codex.