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fix(server): imported ACP sessions show their native history - #22155
Importing an ACP session from Settings opens an empty thread instead of its native history (the accepted part of #22015, triage). session/load fills the adapter snapshot, but nothing reads it.
Change
AgentSessionImporter.importNativeHistory reads the native session snapshot and stores run-less history with historyOrigin: "v1_import", so forks keep it. The thread lock preserves concurrent edits and skips the write if a run starts.
Replayed thoughts become reasoning items, as in live ACP turns. The snapshot identifies them with optional reasoningMessageIds.
AcpRegistrySessions owns import; ws.ts delegates. A failed history read leaves a usable thread; Settings offers Import again before its first run.
Loading times out after two minutes. Every ACP session/close now times out after 10 seconds, so an unresponsive agent releases the mutation lock.
Scope and approval
Fixes the accepted part of #22015. Triage (comment): "So an imported ACP session never shows its native history, either on open or after the first prompt. Accepting that part as a bug." The same comment sends output the agent produces outside a T3 turn to Ideas, so this PR doesn't touch that part.
Verification
vp run check:changed passed on 54f92235c3; only a main merge and a test-import fix came after, up to 57c141ab98. Before: main 0f13d2ccbd; after: 57c141ab98 unless named. I checked file by file that the PR's own non-test code is identical at 57c141ab98 and at bd36eaf0a5; the commits after 57c141ab98 are merges of main and test-file changes. A test server named "Test machine" with an empty home and synthetic data.
1. An imported session shows its native history. Claims 1, 3 and 4 use the repo's scripted ACP agent (apps/server/scripts/acp-mock-agent.ts from this head, the same file on both builds) as a Local command provider, with clicks in the web Browser panel. It replays a short session. Settings › Providers › Scripted agent › List sessions › Import, open the thread:
2. Replayed thoughts show as reasoning rows. Hermes Agent 0.20.5 as a Local command ACP provider (gpt-6-luna) replays two thoughts from a three-turn session; same route, groups expanded. Input: web Browser panel, desktop through the Electron debugging port, iOS simulator and software-rendered Android emulator in the Device panel. Before the fix (de09c91a78, run after the fix was drafted) they show as replies; after (54f92235c3), as reasoning rows:
3. A failed history read leaves a usable thread with Import offered again. The agent answers the read with an error. Import "Sample session A", Refresh, send a message. This head offers Import again and the thread runs a turn; main never asks the agent for the history (no session/resume in its log) and shows "Imported":
4. session/close times out after 10 s. The agent never answers session/close; import "Sample session B". This head gives up after 10 s and the import finishes:
$ harness/show-run.sh scratch/head-run evidence/protocol-head-run.log 04:23:00 | grep -E '^==|04:23.*(session/close|importSession)'
== ACP traffic seen by the scripted agent (from 04:23:00 UTC)
04:23:05.313 client->agent session/close sample-session-b
== Server trace spans (server.trace.ndjson)
04:23:05 04:23:15 10002 ms Interrupted session/close
04:23:04 04:23:15 10363 ms Success AcpRegistrySessions.importSession
Main sends the agent nothing on import:
$ harness/show-run.sh scratch/main-run evidence/protocol-main-run.log 04:25:50 | grep -E '^==|04:25.*(session/close|importSession)'
== ACP traffic seen by the scripted agent (from 04:25:50 UTC)
== Server trace spans (server.trace.ndjson)
04:25:56 04:25:56 12 ms Success ws.acpRegistry.importSession
Not checked: main with a real agent, desktop or mobile; a prompt after the import keeping the rows without duplicates (seen once on web, not captured); session/close outside the import; the two-minute load timeout; an agent whose resume replays nothing (looks as on main); over 99 messages; real phones; forking with reasoning. ACP replays no message times; imported reasoning shows inline.
Prior PRs: #21971 changes how the ACP adapter loads history; this PR adds the caller. The reasoning import adapts @alanjds's patch in only21mil#6.
Macroscope's review found this PR requires human approval — The PR fixes empty ACP imports by loading native session snapshots into thread history and also changes ACP session teardown behavior globally. Its cross-component asynchronous flow and unresolved fork-history propagation risk warrant human review.
Needs human approval because:
1 blocking correctness issue found at or above your repo's Minimum Blocking Severity
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Walkthrough
ACP session closure now times out after 10 seconds. ACP thread imports can read native session history and replay qualifying messages. Session listings and the settings interface identify threads with pending native history and allow another import attempt.
ACP runtime session closure times out after 10 seconds. A mock-agent option suspends close requests, and a test verifies scope teardown completes and the runtime finalizer runs.
ACP Native History Import
Layer / File(s)
Summary
Read and replay native history apps/server/src/project/AgentSessionImporter.ts, apps/server/src/project/AgentSessionImporter.test.ts
The importer opens native sessions through the provider adapter registry and reads snapshots. It imports nonblank user and assistant messages when the thread remains eligible. Tests cover failures, retries, timeouts, repeated imports, and concurrent thread changes.
Expose and trigger history repair packages/contracts/src/acpRegistry.ts, apps/server/src/orchestration-v2/runtimeLayer.ts, apps/server/src/ws.ts, apps/server/src/ws.test.ts, apps/web/src/components/settings/AcpSessionManagementSection.tsx, apps/web/src/components/settings/AcpSessionManagementSection.browser.test.tsx
ACP session listings can mark pending native history. Import handlers attempt history repair for existing threads and after new thread creation. The settings interface allows re-import when history is pending and clears that state after successful import.
Imported sessions from resume-only agents can appear empty and be marked complete, preventing history repair. Fix this before merging.
Security architecture risk: Low · up to 5cf39
History import now starts a temporary session and persists native conversation text. Existing sign-in and approval controls are retained, and session closure is bounded. Remaining uncertainty concerns overlapping activity and slow replay delaying other session operations.
Retained concerns
No architecture-level concerns identified.
Security review details
Security Blast Radius
inferred — The direct data effect is copying native conversation text into the selected application's persistent thread history. The availability effect is broader than that thread: a slow replay occupies the shared mutation permit and can delay imports or native deletions for other sessions using the same coordinator.
Security Findings and Attack Paths
observed — The changed path carries a caller-selected native session reference through project and capability checks into provider startup, then carries provider-supplied text into persisted history. The importer constructs completed message events; it does not translate replayed text into a prompt or orchestration command.
Trust Boundaries and Controls
observed — The production adapter wrapper checks related credential bindings for sign-in changes and applies their access guards to session opening. Registry import retains the existing mapping check, and native deletion refuses deletion while the imported application thread exists.
Resilience and Maintainability Implications
observed — History writes are transactional, and the position allocator separates run-less items from run-associated ordinal ranges, countering partial-batch and ordinary ordinal-collision concerns. Prompt dispatch does not visibly take the registry mutation permit; these controls therefore do not prove a consistent native snapshot during simultaneous live prompting.
Hardening Proposals
proposed — Consider session-keyed mutation serialization, retaining import/delete exclusion for the same native identity while limiting the impact of slow replay on unrelated sessions. This is a containment improvement, not a verified security defect.
Pre-merge checks: 4
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Title check
The title "fix(server): imported ACP sessions show their native history" matches the main change: imported ACP Registry sessions now import their native history into the thread. It follows the convent…
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The description includes all required sections: Problem, Change, Scope and approval, and Verification. It explains the expected behavior, implementation, linked issue and approval context, focused aut…
Full details: Title check
Explanation
The title "fix(server): imported ACP sessions show their native history" matches the main change: imported ACP Registry sessions now import their native history into the thread. It follows the conventional commit format the template suggests, and it names the server scope. The changeset adds the history import, the nativeHistoryPending retry flag, and the 10-second session/close timeout. The title covers the primary fix and omits the secondary close-timeout change, which is acceptable.
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Move the launch-and-history-import sequence into a service method.
importAcpRegistrySession performs the mapping check, thread launch, and native-history import in the WebSocket handler. The repository rule requires handlers to decode input, call one service method, and map errors. Multi-step dispatch belongs in a service.
Move the complete sequence into an ACP session-import service method. Preserve the current behavior: return early for an existing mapping, launch the thread, and log a warning when history import fails. Then make ws.ts call that method and map its typed errors to AcpRegistryOperationError.
The current source exposes this flow only through the WebSocket RPC. Do not rely on an MCP or other import caller as justification unless one is added.
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Review comment at @apps/server/src/ws.ts at line 1404:
Move the mapping check, thread launch, and native-history import sequence from
importAcpRegistrySession in ws.ts into an ACP session-import service method.
Preserve early return for existing mappings and warning logs when history import
fails; update the WebSocket handler to decode input, invoke only that service
method, and map its typed errors to AcpRegistryOperationError.
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Nitpick comments:
Review comments at @apps/server/src/ws.ts:
- Line 1404: Move the mapping check, thread launch, and native-history import
sequence from importAcpRegistrySession in ws.ts into an ACP session-import
service method. Preserve early return for existing mappings and warning logs
when history import fails; update the WebSocket handler to decode input, invoke
only that service method, and map its typed errors to AcpRegistryOperationError.
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Actionable comments posted: 2
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Inline comments:
Review comments at @apps/server/src/ws.ts:
- Around line 1517-1518: Move the ACP import orchestration, including the
importNativeHistory call, out of WS_METHODS.serverImportAcpRegistrySession into
a domain-service capability. Have the WebSocket handler invoke that single
capability and preserve its existing error-to-transport mapping.
- Line 1520: Update importAcpRegistrySession and its existing-thread guard to
detect threads whose importNativeHistory operation did not complete and retry
the history import on later requests. Make the repair path repeat-safe by
checking existing deterministic event IDs or persisted import state before
writing, so ambiguous or partial results cannot duplicate events while completed
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An imported ACP session opened as an empty thread. The import created the
thread with only the native session reference, and loading the session
replayed its history only into the ACP adapter's own snapshot, which no
server code read. After the import, open the session once, read that
snapshot and write its messages into the thread as run-less history,
the same events the Claude and Codex transcript import writes.
Refs pingdotgg#22015
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…ough the registry
The ACP adapter's session finalizer waited for session/close with no
deadline. Finalizers can't be interrupted, so an agent that never
answered kept its process running and held the history import, and the
ACP session lock, even after the import was interrupted. The close now
gets 10 seconds, the bound the Stop path already uses, and the runtime
closes after it.
The history import now gets its adapter from the provider adapter
registry, so the session open has the same sign-in admission as every
other open.
Refs pingdotgg#22015
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Imported ACP history was written as run-less items without marking the
thread, so forks and portable-fork context dropped it. The history write
now sets historyOrigin "v1_import" in the same batch, as transcript
imports do.
That marker also records the import as done. A thread whose history read
failed lists as importable again, and importing it again retries the
read. Threads already marked, or with a run, are left alone.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
… guards
The session list cleared importedThreadId for threads still missing their
history, which also re-enabled Delete and dropped the Imported label. Keep
importedThreadId meaning "a T3 thread exists" and report the repair state
in a separate optional nativeHistoryPending flag. The web row offers Import
for a pending thread while Delete stays disabled, and a repair now reports
imported: true.
Threads imported by the PR's earlier code hold the copied messages but no
marker, and their deterministic event ids made every repair fail on the
UNIQUE event_id. A pending thread that already has those items now gets the
marker alone.
The marker write replaces the whole thread row, so it now holds the
per-thread command lock from its re-read through the write. A rename made
while the session loads survives, and a run that starts meanwhile still
stops the late import. The marker event also carries providerInstanceId.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…rote
Only this PR's own unmerged commits wrote native history without the
v1_import marker, so the collision guard, its turn-item read and its test
covered state that no release can contain.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Main renamed the provider adapter registry layer (pingdotgg#26238), changed
layerWsRpc to take four arguments and need ScratchThreadPromotion
(pingdotgg#26767), and caps comment blocks at four lines (pingdotgg#21514). The importer
layer, the ACP session RPC test and the importNativeHistory docblock
follow suit. The pending-history browser test now asserts through
expect.element, as AGENTS.md asks of browser tests.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Inline comments:
Review comments at @apps/server/src/project/AgentSessionImporter.ts:
- Around line 482-503: Bound the open-and-read operation in importNativeHistory
around adapter.openSession and session.readThreadSnapshot so a pending native
session resume cannot hold the session mutation indefinitely; route timeout
failures through the existing session_import_failed path.
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An agent that supports only session/resume gets no deadline on that
request or on initialize, unlike session/load's 90 seconds, and ACP
imports read the history while holding the session-mutation lock. The
history read now gives up after two minutes and closes the session. A
repair then reports session_import_failed, and a new import keeps its
thread and logs the failure, as for any failed read.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The importer test now runs the import inside the real ACP session-mutation
lock. When the session never answers, the import times out, the session
closes, a waiting import or delete gets the lock, and a later import
repairs the thread. The ACP session RPC test checks that the timeout
reaches the client as session_import_failed.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @apps/server/src/project/AgentSessionImporter.ts:
- Around line 503-509: Move the canReadThreadSnapshot capability check in
readThreadSnapshot before the active-session branch, returning
ProviderAdapterProtocolError when snapshots are unsupported. Keep the existing
active-session behavior for agents that pass the capability check.
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merged current main (267 commits) without rebasing in bfea397. lint, build/typecheck, and Test Server 7 were red because an earlier main merge left ProjectionStore, EventSink, and IdAllocator imported twice in apps/server/src/ws.test.ts. 57c141a drops the duplicates. no other code changes.
blacksmith vp run check:changed passed on 57c141ab98: format, lint, knip, graphql, typecheck for 37 packages, 293 tests in 10 files, and react compiler coverage. reviewed the thought-as-reasoning commits (061f6e9, 54f9223); no changes needed. no new live-provider run for this head; the evidence below covers earlier heads.
Earlier takeover notes
merged current main without rebasing and preserved the policy ceiling and native-history tests. fixed the first continuation sending imported ACP history back into the same native session; the fork marker remains. the added assertion failed before the fix and passed after it.
blacksmith vp run check:changed passed: format, lint, knip, graphql, typecheck for 35 packages, 238 tests in 9 files, and react compiler coverage. head: 3735605596ce3402b6a13cb31ae4657cfe63c2b9. no new live-provider check was run for this fix; the earlier evidence below covers the prior head.
Verified in a real dev environment
verified head 77ab499bc324531923a8e31d14d4a2a8f5b109b6 on a disposable linux VM. main was ce9e016406. both checkouts used vp i and a real background dev server, one at a time. drove the web app with repository Playwright and /usr/bin/google-chrome at 1440x1000.
created the project and conversation through the app, using the real codex-acp 2.5.0 bridge and gpt-6.1-sol through the local proxy. no scripted agent, fixtures, or mock history.
main: settings > providers > native sessions > import created an empty thread despite the completed native conversation.
this head: importing that same session again copied its original user message and assistant reply into the existing thread. "imported" and "delete" were disabled afterward.
continued the imported thread with a real turn. codex recalled cobalt otter 22155. reloading preserved both exchanges exactly once.
a separate import while the native session was still active hit codex's real "session is in use by another client" error. listing again kept "import" enabled and "delete" disabled. after restarting this task's isolated server to release the session, retry restored all four messages.
a new provider instance then imported the same two-turn native session successfully on its first attempt. both replies appeared exactly once.
blacksmith checks: 17 importer/websocket tests passed; the focused unanswered session/close test passed. no code changes were needed. runtime transcript.
main, same native session:
this head, repaired import before continuation:
real continuation, with imported history retained:
inspected the captures and checked uploaded video playback and seeking in chrome.
Not verified
native desktop, iOS, and Android clients; other ACP agents; remote/relay connections; fork behavior; long histories. hung initialize/resume/close and concurrent rename/run races were not induced with a real provider. the existing focused tests cover those fault cases, but they do not prove them against every agent.
native replay included T3's injected instructions in the first user message, as supplied by this bridge. the screenshot shows that raw history rather than a cleaned transcript.
Adapt upstream PR pingdotgg#22155 at 3735605 onto v0.1.7. Preserve release test setup and include bounded cleanup, repeated import, fork retention and native continuation replay guards.
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Adapt upstream PR pingdotgg#22155 at 3735605 onto v0.1.7. Preserve release test setup and include bounded cleanup, repeated import, fork retention and native continuation replay guards.
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Adapt upstream PR pingdotgg#22155 at 3735605 onto v0.1.7. Preserve release test setup and include bounded cleanup, repeated import, fork retention and native continuation replay guards.
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Adapt upstream PR pingdotgg#22155 at 3735605 onto v0.1.7. Preserve release test setup and include bounded cleanup, repeated import, fork retention and native continuation replay guards.
The serverImportAcpRegistrySession handler ran the whole import itself:
project and instance lookup, the existing-thread repair, the thread
launch and the native history import. It now calls
AcpRegistrySessions.importSession, which holds that sequence unchanged.
The project and session-manager lookups move with it, and the other ACP
session handlers reuse them.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Conflicts:
- ws.ts: main's Effect 4.1.2 upgrade (pingdotgg#26833) edited the import block that
this branch moved into AcpRegistrySessions. Keep the move, and give the
service the same change: SecureRandom.uuidV4() instead of
Crypto.randomUUIDv4().
- ws.test.ts: union of both sides' imports, with duplicates dropped.
- AcpSessionManagementSection.browser.test.tsx: keep both sides' new tests.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Main's layerWsRpc takes the client's settings capabilities, so the ACP
session RPC test passes them. Effect 4.1.2 flags process.env reads inside
Effect code, so the mock agent reads its close-session flag at module load
like its other flags.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Main is merged into this branch in 93ca03c, so CI can run.
The one code conflict was in ws.ts: the Effect 4.1.2 upgrade (#26833) edited the ACP import code that this PR moves into AcpRegistrySessions. The move stays, and the service now gets its command id from SecureRandom.uuidV4(), as main does. de09c91 adapts two test fixtures to main. vp run check:changed passes, with 286 tests.
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Adapt upstream PR pingdotgg#22155 at 3735605 onto v0.1.7. Preserve release test setup and include bounded cleanup, repeated import, fork retention and native continuation replay guards.
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Adapt upstream PR pingdotgg#22155 at 3735605 onto v0.1.7. Preserve release test setup and include bounded cleanup, repeated import, fork retention and native continuation replay guards.
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Adapt upstream PR pingdotgg#22155 at 3735605 onto v0.1.7. Preserve release test setup and include bounded cleanup, repeated import, fork retention and native continuation replay guards.
I just tested this change on my real, daily Hermes Agent, and it worked good!
However the "Thinking" blocks got imported without a marker as "Thinking", "Tool Call" or anything like that. So I sent a PR over the @only21mil' fork: only21mil#6
You can see the details there, but is a simple change and the end result is this:
Loading an ACP session replays agent_thought_chunk updates into the
adapter's snapshot as assistant text, so the native history import wrote
the agent's thinking as chat replies. The snapshot now lists which of its
messages came from thought chunks, and the importer writes those as
run-less reasoning items, the item type live ACP turns use.
Co-authored-by: Alan Justino da Silva <155623+alanjds@users.noreply.github.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
A replayed agent_thought (not only agent_thought_chunk) is now covered by
the snapshot test. The reasoning id set is copied only when a new thought
starts, and the import event id reuses the turn item id.
Co-authored-by: Alan Justino da Silva <155623+alanjds@users.noreply.github.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
@alanjds Thank you for testing this on your daily Hermes Agent and catching that its replayed thinking came in as plain assistant replies. 061f6e9 fixes it on this branch and keeps your design: the ACP snapshot marks which messages are thoughts, and the importer writes those as run-less reasoning items. It tracks them in one set that resets with the rest of the snapshot, and 54f9223 adds test coverage for whole agent_thought replays. Your fork PR only21mil#6 is credited in the description and as co-author on both commits, and we'll close it in favour of these commits.
Drop the settings browser test that only checked a button label derived from
a flag, drop the ws test's error-mapping branches, and revert the unrelated
import reordering in ws.test.ts.
AI-assisted; verified with the tests and tools listed above.
Real web client, Chromium, light theme, 1280×800 CSS viewport; separate fresh databases and the same synthetic local ACP provider on both commits. No T3 prompt was sent.
Steps: Settings > Providers > Native history demo > Garden > List sessions > Import Native conversation; close Settings, expand Working, and open the thread. Expand Worked for on head to inspect reasoning. Then reject history loading for Retry conversation, import it, refresh the list, restore loading, and retry before running a turn.
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Problem
Importing an ACP session from Settings opens an empty thread instead of its native history (the accepted part of #22015, triage).
session/loadfills the adapter snapshot, but nothing reads it.Change
AgentSessionImporter.importNativeHistoryreads the native session snapshot and stores run-less history withhistoryOrigin: "v1_import", so forks keep it. The thread lock preserves concurrent edits and skips the write if a run starts.reasoningitems, as in live ACP turns. The snapshot identifies them with optionalreasoningMessageIds.AcpRegistrySessionsowns import;ws.tsdelegates. A failed history read leaves a usable thread; Settings offers Import again before its first run.session/closenow times out after 10 seconds, so an unresponsive agent releases the mutation lock.Scope and approval
Fixes the accepted part of #22015. Triage (comment): "So an imported ACP session never shows its native history, either on open or after the first prompt. Accepting that part as a bug." The same comment sends output the agent produces outside a T3 turn to Ideas, so this PR doesn't touch that part.
Verification
vp run check:changedpassed on54f92235c3; only a main merge and a test-import fix came after, up to57c141ab98. Before: main0f13d2ccbd; after:57c141ab98unless named. I checked file by file that the PR's own non-test code is identical at57c141ab98and atbd36eaf0a5; the commits after57c141ab98are merges of main and test-file changes. A test server named "Test machine" with an empty home and synthetic data.1. An imported session shows its native history. Claims 1, 3 and 4 use the repo's scripted ACP agent (
apps/server/scripts/acp-mock-agent.tsfrom this head, the same file on both builds) as a Local command provider, with clicks in the web Browser panel. It replays a short session. Settings › Providers › Scripted agent › List sessions › Import, open the thread:2. Replayed thoughts show as reasoning rows. Hermes Agent 0.20.5 as a Local command ACP provider (
gpt-6-luna) replays two thoughts from a three-turn session; same route, groups expanded. Input: web Browser panel, desktop through the Electron debugging port, iOS simulator and software-rendered Android emulator in the Device panel. Before the fix (de09c91a78, run after the fix was drafted) they show as replies; after (54f92235c3), as reasoning rows:3. A failed history read leaves a usable thread with Import offered again. The agent answers the read with an error. Import "Sample session A", Refresh, send a message. This head offers Import again and the thread runs a turn; main never asks the agent for the history (no
session/resumein its log) and shows "Imported":4.
session/closetimes out after 10 s. The agent never answerssession/close; import "Sample session B". This head gives up after 10 s and the import finishes:Main sends the agent nothing on import:
Not checked: main with a real agent, desktop or mobile; a prompt after the import keeping the rows without duplicates (seen once on web, not captured);
session/closeoutside the import; the two-minute load timeout; an agent whose resume replays nothing (looks as on main); over 99 messages; real phones; forking with reasoning. ACP replays no message times; imported reasoning shows inline.Prior PRs: #21971 changes how the ACP adapter loads history; this PR adds the caller. The reasoning import adapts @alanjds's patch in only21mil#6.
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