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fix(server): provider launches and text generation wait for provider updates - #31186
A one-click provider update only waited for other updates. Provider work could start while the installer was replacing the files. During an npm update, npm install -g removes <prefix>/bin/codex for several seconds. Anything that started the CLI in that window failed, and the update still reported "Provider updated.". Reproduced on main with the real dev server, a fresh database, and Codex npm-installed in a scratch prefix (0.163.0 → 0.166.0 via server.updateProvider):
A generated commit message requested during the swap failed with TextGenerationError: Failed to spawn Codex CLI process … spawn …/bin/codex ENOENT.
A new thread started during the swap failed with "Provider session failed to open".
In both runs the update ended succeeded / "Provider updated.". With no update running, the same commit request succeeded.
Change
New ProviderInstallationGate service. Each instance gets a small reader/writer gate. Provider work takes a shared slot. An update takes the gate exclusively, and only around its install command. Because the update holds a turnstile while it waits, new work queues behind a waiting update instead of overtaking it.
Gated launch points, the places that start a provider CLI:
TextGeneration.generate: held until the generation finishes, i.e. until its subprocess exits.
ProviderSessionManagerV2.open, around adapter.openSession only. A long-lived session never blocks an update.
ClaudeAdapterV2, around each turn's query open. The Claude SDK spawns its CLI per turn, not in openSession. The gate is released once the query is open, not held for the turn.
Instances sharing an installation. The update gates every instance of the same driver whose update lock key matches, for example two Codex accounts on one binary. Other drivers in the same npm prefix are not blocked.
Status messages. While an update waits for in-flight work, its status reads "Waiting for running provider work to finish.". It switches to "Running " only once the install command starts.
Wiring. One gate instance is shared across the server. The Claude adapter receives it through provider hydration.
No contract, setting, persisted state or client changes.
Red test first.providerMaintenanceRunner > holds text generation for an instance until its update finishes fails on main: text generation reaches the provider before the installer exits. It passes on this branch.
New tests, each checked to fail when its protection is removed:
ProviderInstallationGate > queues work that starts while an update waits for in-flight work
providerMaintenanceRunner > holds every instance that shares the updated installation: a same-driver instance waits; a different driver with the same npm lock key runs straight away.
providerMaintenanceRunner > runs the installer after in-flight provider work and before later work
ProviderSessionManagerV2 opens provider sessions inside the installation gate
ClaudeAdapterV2 > opens each turn's Claude process inside the installation gate
Suites run: the touched suites (providerMaintenanceRunner, ProviderInstallationGate, ProviderSessionManager, ClaudeAdapterV2, CodexTextGeneration, ProviderRegistry, ProviderInstanceRegistry, and the Claude replay integration tests) pass, and vp run check:changed passes.
Runtime transcript. Real dev server, fresh database on each side, same RPC driver. The driver waits until npm has removed the entry point, then sends the request.
## before, main df70f505a3: generated commit message during the update
[+2.05s] server.updateProvider sent
[+5.96s] entry point missing: <prefix>/bin/codex
[+5.96s] git.runStackedAction(commit, generated message) sent
[+6.40s] git.runStackedAction exit Failure TextGenerationError "Failed to spawn Codex CLI process" (spawn <prefix>/bin/codex ENOENT)
[+13.37s] server.updateProvider exit Success {"updateState":"succeeded","message":"Provider updated.","version":"0.166.0"}
## before, main df70f505a3: new thread during the update
[+3.32s] entry point missing: <prefix>/bin/codex
[+3.32s] orchestration.launchThread sent (new thread, fresh provider session)
[+5.75s] runs ["failed"] thread item: error "Provider session failed to open"
[+10.09s] server.updateProvider exit Success {"updateState":"succeeded","message":"Provider updated.","version":"0.166.0"}
## after, fix/issue-31148 682c504f79 (same tree as 8b994bfd7d): generated commit message during the update
[+4.61s] entry point missing: <prefix>/bin/codex
[+4.61s] git.runStackedAction(commit, generated message) sent
[+11.37s] server.updateProvider exit Success {"updateState":"succeeded","message":"Provider updated.","version":"0.166.0"}
[+13.35s] git.runStackedAction exit Success commit created "Add hi helper"
## after, fix/issue-31148 682c504f79 (same tree as 8b994bfd7d): new thread during the update
[+3.90s] entry point missing: <prefix>/bin/codex
[+3.90s] orchestration.launchThread sent (new thread, fresh provider session)
[+4.62s] runs ["starting"]
[+8.86s] runs ["running"]
[+9.80s] server.updateProvider exit Success {"updateState":"succeeded","message":"Provider updated.","version":"0.166.0"}
[+11.09s] runs ["waiting"] thread item: assistant_message "OK"
Not checked at runtime:
The Claude per-turn path is covered by its unit test only; no Claude npm install was exercised.
The direction where an update waits for in-flight work, and the new waiting message, are covered by unit tests, not the transcript.
The full driver and transcript could not be attached.
AI-assisted; verified with the tests and tools listed above.
…1148)
While a one-click update of a provider instance is still running its
installer, a text generation request for that instance reaches the
provider immediately instead of waiting for the update to finish. This
test reproduces #31148 and fails on main.
…updates
A one-click provider update replaces the installation in place (npm
removes the binary for several seconds), but only other updates waited
for it. A generated commit message or a new thread started during the
update spawned a missing binary and failed with ENOENT or "Provider
session failed to open".
ProviderInstallationGate is a small reader/writer gate per provider
instance. Text generation and session opening run as shared executions;
an update waits for in-flight executions, then holds every instance whose
installation shares its update lock key while the installer runs. New
executions queue behind a waiting update so a stream of them cannot
starve it. Long-lived sessions are only held while they open.
Fixes#31148
… gate
Claude spawns its CLI per turn, so the adapter now opens each turn's query
inside the installation gate for its instance, releasing it once the SDK
returns. The gate is provided below provider hydration so the Claude adapter
receives the same server-wide instance.
An update now holds only instances of its own driver that share the lock key,
since the lock key names the package manager location, not the package. The
update reports that it is waiting for running provider work before the gate,
and "Running <command>" only once the command can start.
Adds tests for the session-open and Claude query-open gates and a direct gate
test that later work queues behind an update waiting to drain.
Macroscope's review found this PR approvable — Provider launches and text generation now coordinate with installation updates instead of starting while binaries are being replaced. The change is limited to synchronization around existing operations, without changing product defaults or persistent data.
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Walkthrough
The change adds a per-instance gate that coordinates provider execution with installation updates. Provider maintenance, text generation, provider session opening, and Claude query opening now use the gate. Runtime layers and tests provide the gate to these paths.
The gate coordinates provider work and updates for selected instances. The maintenance runner identifies instances that share the target installation and runs the update through the gate. Tests cover update ordering and shared-installation behavior.
Text generation, provider session opening, and Claude query opening execute through the gate. Runtime layers and test setups provide the gate. Tests assert gate ordering around provider work.
sequenceDiagram
participant TextGeneration
participant ProviderInstallationGate
participant ProviderMaintenanceRunner
participant ProviderInstallation
TextGeneration->>ProviderInstallationGate: execute for provider instance
ProviderInstallationGate->>ProviderInstallation: run provider work
ProviderMaintenanceRunner->>ProviderInstallationGate: update shared installation instances
ProviderInstallationGate-->>ProviderMaintenanceRunner: wait for active provider work to finish
ProviderInstallation->>ProviderInstallationGate: provider work completes
ProviderInstallationGate->>ProviderInstallation: run installation update
ProviderInstallationGate-->>TextGeneration: admit later provider work after update
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Possibly related PRs
pingdotgg/t3code#26673: Adds workflow and delegated-agent execution through provider sessions and text-generation paths that this change gates.
Suggested reviewers:maria-rcks
Merge Risk: Minimal · previous review fd32d
This change makes provider launches and text generation wait for in-flight provider updates instead of racing them. No concrete merge-blocking risk was found in the reviewed changes.
Pre-merge checks: 3 · 1
Failed checks: 1 warning
Check name
Status
Explanation
Resolution
Description check
The description gives detailed problem, change, and verification information. The Scope and approval section links issue #31148 but does not show that the issue is triaged or provide explicit maintain…
Add evidence that issue #31148 is triaged, or link the discussion and maintainer comment that explicitly approves the direction and scope. If relying on the small, obvious-fix exception, explain why this change qualifies.
Passed checks: 3 passed
Check name
Status
Explanation
Title check
The title clearly summarizes the main change: provider launches and text generation wait for provider updates.
Linked Issues check
Issue #31148 requires coordination between provider installation updates and launches or text-generation work, including work that is waiting to start. ProviderInstallationGate drains active work an…
Out of Scope Changes check
The reported changes add the gate, apply it to provider execution and installation commands, wire it into server and test layers, and add focused tests. These changes support issue #31148. The Claude …
Full details: Linked Issues check
Explanation
Issue #31148 requires coordination between provider installation updates and launches or text-generation work, including work that is waiting to start. ProviderInstallationGate drains active work and holds a turnstile so later work cannot overtake a waiting update. TextGeneration.generate executes provider resolution and invocation through the gate. The PR summary reports that session opening and each Claude query opening also use the gate, and that updates cover instances sharing the installation lock key. The reported tests cover update ordering, text generation, shared installations, session opening, and Claude query opening.
Full details: Out of Scope Changes check
Explanation
The reported changes add the gate, apply it to provider execution and installation commands, wire it into server and test layers, and add focused tests. These changes support issue #31148. The Claude query-open failure cleanup is part of the changed query-open path and no unrelated change is established by the available evidence.
Full details: Description check
Explanation
The description gives detailed problem, change, and verification information. The Scope and approval section links issue #31148 but does not show that the issue is triaged or provide explicit maintainer approval of the direction and scope, as the template requires.
Resolution
Add evidence that issue #31148 is triaged, or link the discussion and maintainer comment that explicitly approves the direction and scope. If relying on the small, obvious-fix exception, explain why this change qualifies.
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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
minimal, and validate.
Failed pre-merge checks:
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comment that explicitly approves the direction and scope. If relying on the
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bugfixFix PR opened by an issue lead; enters the PR looppr:gate-failedA land gate failedsize:L100-499 changed lines (additions + deletions).vouch:trustedPR author is trusted by repo permissions or the VOUCHED list.
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Problem
A one-click provider update only waited for other updates. Provider work could start while the installer was replacing the files. During an npm update,
npm install -gremoves<prefix>/bin/codexfor several seconds. Anything that started the CLI in that window failed, and the update still reported "Provider updated.". Reproduced on main with the real dev server, a fresh database, and Codex npm-installed in a scratch prefix (0.163.0 → 0.166.0 viaserver.updateProvider):TextGenerationError: Failed to spawn Codex CLI process … spawn …/bin/codex ENOENT.succeeded / "Provider updated.". With no update running, the same commit request succeeded.Change
ProviderInstallationGateservice. Each instance gets a small reader/writer gate. Provider work takes a shared slot. An update takes the gate exclusively, and only around its install command. Because the update holds a turnstile while it waits, new work queues behind a waiting update instead of overtaking it.TextGeneration.generate: held until the generation finishes, i.e. until its subprocess exits.ProviderSessionManagerV2.open, aroundadapter.openSessiononly. A long-lived session never blocks an update.ClaudeAdapterV2, around each turn's query open. The Claude SDK spawns its CLI per turn, not inopenSession. The gate is released once the query is open, not held for the turn.No contract, setting, persisted state or client changes.
Scope and approval
Fixes #31148
Verification
providerMaintenanceRunner > holds text generation for an instance until its update finishesfails on main: text generation reaches the provider before the installer exits. It passes on this branch.ProviderInstallationGate > queues work that starts while an update waits for in-flight workproviderMaintenanceRunner > holds every instance that shares the updated installation: a same-driver instance waits; a different driver with the same npm lock key runs straight away.providerMaintenanceRunner > runs the installer after in-flight provider work and before later workProviderSessionManagerV2 opens provider sessions inside the installation gateClaudeAdapterV2 > opens each turn's Claude process inside the installation gateproviderMaintenanceRunner,ProviderInstallationGate,ProviderSessionManager,ClaudeAdapterV2,CodexTextGeneration,ProviderRegistry,ProviderInstanceRegistry, and the Claude replay integration tests) pass, andvp run check:changedpasses.AI-assisted; verified with the tests and tools listed above.