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feat(web): session import keeps going past the 100-conversation batch limit - #32128
Each agentSessions.import call imports at most 100 conversation files and 4 GiB per project (MAX_IMPORT_TRANSCRIPTS, MAX_IMPORT_BYTES). Everything past that budget is counted in skippedCount, and the welcome wizard reports it the same way as unreadable files: "Imported 100 threads. 153 threads could not be imported." Nothing is wrong with those conversations, and running import again does import them. But the wizard does not do that by itself or say so. After onboarding, the only way back into the wizard is typing /welcome, which desktop users cannot do without DevTools.
Repro on main:
Have a project with more than 100 Claude Code or Codex conversations from the last 30 days.
Import it from the welcome wizard.
Expected: every conversation is imported, or the wizard clearly says which ones are left and how to continue.
Actual: the first 100 are imported, and the rest are reported as "could not be imported".
Context: #17484 asked for this ("Import all selected, valid conversations, or clearly identify which hit the limit and offer a way to continue"). #23192 closed it by making the 100,000-record limit apply per transcript, but the per-run transcript and byte budgets still behave as described above. This comment on #17484 describes a project with 308 sessions that needed three manual wizard runs, plus a fourth to confirm nothing was left. Every run ended with a message that read like a failure.
AgentSessionImportResult gains an optional deferredCount: the part of skippedCount that the per-attempt budget left for a later attempt.
skippedCount keeps its meaning, the total not imported. An older client talking to a newer server therefore behaves exactly as today.
A newer client talking to an older server, which omits deferredCount, runs a single batch as today.
Server (AgentSessionScanner.ts, AgentSessionImporter.ts)
recentThreads emits a new Deferred outcome when the transcript-count or byte budget is exhausted, or when a file does not fit the bytes left in this attempt.
Real failures stay Skipped: files over 4 GiB, unreadable files, files without a matching cwd, and unparseable files.
The importer counts Deferred in both skippedCount and deferredCount.
Failures that an unchanged file repeats are remembered in memory by file identity, and later attempts report them as skipped without spending the budget again. These are:
the per-transcript record limit;
the 32 MiB kept-history limit and other parse errors;
no cwd;
parseAgentSessionRecords returning null.
Without this, 100 newer failing sessions would fill every batch, and the conversations behind them would never be reached.
Failures worth retrying are not remembered, and readTranscript keeps them apart ("unimportable" versus null): read errors, a file that changes while it is read, and a Codex rollout whose inherited history could not be read.
A changed file has a new identity and is read again.
For each project, the wizard calls import again while the previous batch left fewer deferred threads. The strict decrease guarantees the loop ends.
If a batch makes no progress, the loop stops, and the threads still deferred count as not imported. Another run would stall the same way.
importedCount already includes threads imported by earlier batches, so only each project's last batch is counted.
While batches run:
a status line shows "Importing (2 of 3)… 100 threads imported, 153 left";
"Stop importing" replaces "Do not import projects". Stopping takes effect between batches, because an in-flight call cannot be cancelled.
The summary toast separates threads that "could not be imported" from threads "not imported yet". When work is left, after a stop or a failed batch, it offers "Continue import". That reopens setup on the Projects step with the unfinished projects and their computers selected, carried in the navigation state, including projects that were picked by hand outside the recent defaults.
Docs:docs/user/welcome-wizard.md replaces "Run import again to continue a large batch" with the new behavior.
Mobile has no session import UI, and no MCP tool exposes this RPC, so there is nothing to change there. Desktop uses the web wizard.
Scope and approval
This changes product behavior: import now continues automatically, the wizard gains Stop and Continue controls, and the summary wording changes. Under CONTRIBUTING.md that needs explicit maintainer approval of the direction and scope, and this PR does not have it yet.
New case "defers transcripts past the per-attempt budget and skips known failures for free". It uses 100 unparseable newest rollouts and 101 valid older ones:
attempt 1: 100 Skipped and 101 Deferred;
attempt 2: the failures are skipped for free, then 100 Importable and 1 Deferred;
attempt 3: a rewritten failure is read again, then AlreadyImported for the rest and the last one Importable.
The case fails on main, and it also fails if the memo is disabled.
Extended case "skips excessive records without blocking an older valid transcript". The budget is filled ahead of a valid transcript by one transcript with 100,001 records and 99 rollouts that fail on every attempt (missing inherited history). Attempt 1 defers the valid transcript, and attempt 2 imports it. It fails if read-limit failures are not remembered.
New case "retries a transcript after a read error": a failed open is not remembered, so the next attempt imports the transcript.
apps/server/src/project/AgentSessionImporter.test.ts: the counts case now mixes Deferred and Skipped outcomes and expects deferredCount. The exact result assertions include deferredCount: 0.
apps/web/src/onboarding/projectImport.logic.test.ts: table cases for shouldImportNextBatch (old server, first batch, shrinking, unchanged, done), the progress label and the summary text.
apps/web/src/components/onboarding/WelcomeWizard.import.browser.test.tsx, new cases:
batching plus Stop: the second project is not started, and "Continue import" is offered;
a batch with no progress;
a failed batch after a successful one, which keeps the counted threads;
two projects where one server omits deferredCount;
Continue import for a project outside the defaults: the toast action reopens setup on that project, and the second import uses the existing project.
Results: scanner and importer 72/72, web logic and browser 43/43. vp run check:changed passes: format, lint, knip, typecheck (36 packages), tests beside changes (117), and the React compiler check.
Manual: isolated dev servers for main and this branch, each with a temporary base dir, temporary HOME/CODEX_HOME/CLAUDE_CONFIG_DIR, and 253 synthetic Codex sessions in one project (3 of them unparseable). Captured headless with Playwright:
Import step, before (main)
Import step, after
During import, before (main)
During import, after: progress line and Stop importing
Summary, before (main): "Imported 100 threads. 153 threads could not be imported."
Summary, after: "Imported 250 threads. 3 threads could not be imported."
Stop, after: stopping between batches
Stop, after: "Import stopped. Imported 200 threads. 53 threads were not imported yet." with Continue import
Continue import, after: setup reopened on the Projects step with the unfinished, non-default project selected
Recording of the automatic batches (sped up to about 12 seconds)
after-batching.webm
Stopping after the first batch still finishes the batch already in flight, which is why scenario B ends at 200 threads.
Not verified:
The byte-budget branches (size > bytesRemaining, an exhausted byte budget, files over 4 GiB). The limits are fixed at 4 GiB, so only the transcript-count budget is covered by tests. Both budgets share the same Deferred path.
Known limits and follow-ups (not in this PR):
Each batch is a separate agentSessions.import request, so the agent_session.import feature-usage event fires once per batch.
Some failures are retried on every attempt and still use budget: importer-side rejections (such as a Claude session ID that cannot be resumed), read errors, and Codex rollouts whose inherited history is missing. If at least 100 of them are newer than the remaining conversations, the wizard stops and reports the rest as not imported.
Pre-existing: a rewound Codex rollout whose inherited history does not fit the remaining byte budget is imported without that history, rather than deferred.
Built with Claude Code (Claude Opus 5.5 orchestrating; Claude Sonnet 5.5 and Claude Haiku 5.5 subagents for implementation, review and checks). Screenshots captured by Codex (GPT-6.1 Sol).
Macroscope's review found this PR requires human approval — Import now continues automatically beyond the first batch, with progress and Stop/Continue controls. A maintainer needs to confirm this new default, which can import substantially more history and extend processing after a single user action.
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No actionable comments were generated in the recent review.
Walkthrough
Agent-session imports now distinguish budget-deferred transcripts from other skipped transcripts. The onboarding wizard imports repeated batches, displays progress, supports stopping, and provides a continuation action when deferred work remains or the import was stopped.
Changes: Agent-session import batching
Layer / File(s)
Summary
Scanner budgets and deferred results packages/contracts/src/agentSessions.ts, apps/server/src/project/AgentSessionScanner.ts, apps/server/src/project/AgentSessionImporter.ts, apps/server/src/project/AgentSessionScanner.test.ts, apps/server/src/project/AgentSessionImporter.test.ts
The scanner returns Deferred when transcript or byte budgets are exhausted. It caches certain unimportable transcript identities. The importer includes deferredCount in its result and counts deferred outcomes as skipped.
Batch decisions and import messages apps/web/src/onboarding/projectImport.logic.ts, apps/web/src/onboarding/projectImport.logic.test.ts
Helpers decide whether to request another batch and format progress and warning messages. Tests cover continuation decisions and message content.
Onboarding batch flow and controls apps/web/src/components/onboarding/WelcomeWizard.tsx, apps/web/src/components/onboarding/WelcomeWizard.import.browser.test.tsx, docs/user/welcome-wizard.md
The wizard imports batches, displays progress, supports stopping, and offers continuation when applicable. Browser tests cover batch outcomes. The guide describes import limits and continuation.
sequenceDiagram
participant WelcomeWizard
participant AgentSessionImporter
participant AgentSessionScanner
WelcomeWizard->>AgentSessionImporter: Import a project batch
AgentSessionImporter->>AgentSessionScanner: Request recent thread outcomes
AgentSessionScanner-->>AgentSessionImporter: Return candidates, skipped outcomes, and deferred outcomes
AgentSessionImporter-->>WelcomeWizard: Return import counts
WelcomeWizard->>AgentSessionImporter: Request another batch when deferred work decreases
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Possibly related issues
Issue 17484 — The change adds repeated batches and distinguishes budget-deferred conversations from other skipped conversations.
Issue 24067 — The change reports batch progress and deferred counts, but does not establish the cause of every missing conversation.
Issue 31677 — The change documents the 100,000-record limit and adds tests for oversized transcripts; it does not provide a per-conversation explanation for that limit.
Possibly related PRs
PR 31641 — It changes importedCount, which this PR uses to report import progress and batch totals.
PR 27215 — Both changes affect whether repeated scans can reach older transcripts.
PR 28842 — It changes the /welcome flow and adds a progress stream returning AgentSessionImportResult, which this PR extends.
Suggested reviewers:juliusmarminge
Merge Risk: Low · up to af79b
Imports now continue across batches and can be stopped and resumed. Minor edge cases remain, such as Continue import reselecting projects that failed outright. These are bounded and do not block merging, though the maintainer's product approval is still pending.
Pre-merge checks: 4
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Explanation
Title check
The title clearly describes the main change: continuing session imports beyond one batch.
Description check
The description is mostly complete and includes detailed verification. Maintainer approval of the direction and scope is still required; add a link to the approval comment when available.
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.
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Actionable comments posted: 2
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Inline comments:
Review comments at @apps/server/src/project/AgentSessionScanner.ts:
- Around line 1804-1806: Update the transcript scanning flow around the
`transcriptsRemaining` and `identity.size` checks to distinguish deterministic
record-limit failures from transient read or identity failures. Remember
unchanged limit failures across batches so they are not repeatedly read and
older transcripts can still be processed; preserve retries for transient
failures. Add a regression test covering 100 over-limit transcripts before a
valid transcript.
Review comments at @apps/web/src/components/onboarding/WelcomeWizard.tsx:
- Around line 207-209: Update the “Continue import” handler in WelcomeWizard so
reopening the wizard carries forward the interrupted project selection and its
computer IDs, rather than relying only on recent-project defaults. Preserve the
ability to select other projects, and add a test that follows this action
through a second import for a non-default project.
---
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Problem
Each
agentSessions.importcall imports at most 100 conversation files and 4 GiB per project (MAX_IMPORT_TRANSCRIPTS,MAX_IMPORT_BYTES). Everything past that budget is counted inskippedCount, and the welcome wizard reports it the same way as unreadable files: "Imported 100 threads. 153 threads could not be imported." Nothing is wrong with those conversations, and running import again does import them. But the wizard does not do that by itself or say so. After onboarding, the only way back into the wizard is typing/welcome, which desktop users cannot do without DevTools.Repro on main:
Expected: every conversation is imported, or the wizard clearly says which ones are left and how to continue.
Actual: the first 100 are imported, and the rest are reported as "could not be imported".
Context: #17484 asked for this ("Import all selected, valid conversations, or clearly identify which hit the limit and offer a way to continue"). #23192 closed it by making the 100,000-record limit apply per transcript, but the per-run transcript and byte budgets still behave as described above. This comment on #17484 describes a project with 308 sessions that needed three manual wizard runs, plus a fourth to confirm nothing was left. Every run ended with a message that read like a failure.
Change
Contract (
packages/contracts/src/agentSessions.ts)AgentSessionImportResultgains an optionaldeferredCount: the part ofskippedCountthat the per-attempt budget left for a later attempt.skippedCountkeeps its meaning, the total not imported. An older client talking to a newer server therefore behaves exactly as today.deferredCount, runs a single batch as today.Server (
AgentSessionScanner.ts,AgentSessionImporter.ts)recentThreadsemits a newDeferredoutcome when the transcript-count or byte budget is exhausted, or when a file does not fit the bytes left in this attempt.Skipped: files over 4 GiB, unreadable files, files without a matching cwd, and unparseable files.Deferredin bothskippedCountanddeferredCount.parseAgentSessionRecordsreturning null.readTranscriptkeeps them apart ("unimportable"versusnull): read errors, a file that changes while it is read, and a Codex rollout whose inherited history could not be read.Wizard (
WelcomeWizard.tsx,projectImport.logic.ts)importedCountalready includes threads imported by earlier batches, so only each project's last batch is counted.Docs:
docs/user/welcome-wizard.mdreplaces "Run import again to continue a large batch" with the new behavior.Mobile has no session import UI, and no MCP tool exposes this RPC, so there is nothing to change there. Desktop uses the web wizard.
Scope and approval
This changes product behavior: import now continues automatically, the wizard gains Stop and Continue controls, and the summary wording changes. Under CONTRIBUTING.md that needs explicit maintainer approval of the direction and scope, and this PR does not have it yet.
Please treat this as a proposal until the direction is approved there.
Related open PRs:
importedCountcount only newly imported threads.importedCountacross batches instead of taking the last batch.AgentSessionScanner.ts(record limits and parsing), so small rebase conflicts are likely. Their behavior does not overlap.Verification
Focused tests:
apps/server/src/project/AgentSessionScanner.test.ts:apps/server/src/project/AgentSessionImporter.test.ts: the counts case now mixes Deferred and Skipped outcomes and expectsdeferredCount. The exact result assertions includedeferredCount: 0.apps/web/src/onboarding/projectImport.logic.test.ts: table cases forshouldImportNextBatch(old server, first batch, shrinking, unchanged, done), the progress label and the summary text.apps/web/src/components/onboarding/WelcomeWizard.import.browser.test.tsx, new cases:deferredCount;Results: scanner and importer 72/72, web logic and browser 43/43.
vp run check:changedpasses: format, lint, knip, typecheck (36 packages), tests beside changes (117), and the React compiler check.Manual: isolated dev servers for main and this branch, each with a temporary base dir, temporary
HOME/CODEX_HOME/CLAUDE_CONFIG_DIR, and 253 synthetic Codex sessions in one project (3 of them unparseable). Captured headless with Playwright:Import step, before (main)
Import step, after
During import, before (main)
During import, after: progress line and Stop importing
Summary, before (main): "Imported 100 threads. 153 threads could not be imported."
Summary, after: "Imported 250 threads. 3 threads could not be imported."
Stop, after: stopping between batches
Stop, after: "Import stopped. Imported 200 threads. 53 threads were not imported yet." with Continue import
Continue import, after: setup reopened on the Projects step with the unfinished, non-default project selected
Recording of the automatic batches (sped up to about 12 seconds)
after-batching.webm
Stopping after the first batch still finishes the batch already in flight, which is why scenario B ends at 200 threads.
Not verified:
size > bytesRemaining, an exhausted byte budget, files over 4 GiB). The limits are fixed at 4 GiB, so only the transcript-count budget is covered by tests. Both budgets share the sameDeferredpath.Known limits and follow-ups (not in this PR):
agentSessions.importrequest, so theagent_session.importfeature-usage event fires once per batch.Built with Claude Code (Claude Opus 5.5 orchestrating; Claude Sonnet 5.5 and Claude Haiku 5.5 subagents for implementation, review and checks). Screenshots captured by Codex (GPT-6.1 Sol).
🤖 Generated with Claude Code