fix(web): keep control plane available when selected model is unavailable - #193
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…able When the selected model could not be constructed at startup (e.g. a managed account whose token expired), the web server aborted before the settings UI, /api/health, and provider-auth recovery endpoints were reachable — leaving the desktop shell with no way to recover. - runWebServer no longer aborts on agent construction failure: it keeps the selected provider/model and logs, so the control plane stays up for reauthentication and model changes. - Engine.ensureAgentAvailable lazily retries agent construction before the next send. It is fail-closed: it never falls back to a different model silently, and rebuilds are serialized with the normal model/mode switch paths. - submitMessage returns an error instead of assuming success; chat, set-goal, automation runs, and SubmitMessage now surface HTTP 503 with an actionable message and release the running claim on failure, so a degraded engine cannot wedge the session behind "processing".
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Caution Review failedjcode review did not complete. No native review was published for this attempt. Pull request: #193 · fix(web): keep control plane available when selected model is unavailable Revision: Plan: 7 of 7 files indexed · 7 eligible · 323 changed lines Reason: The review runner failed. Open the Cloud Run for details. This status comment is updated in place. The native review is a separate, non-blocking COMMENT review. |
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configurationConfiguration used: defaults Review profile: CHILL Plan: Pro Plus Run ID: 📒 Files selected for processing (4)
🚧 Files skipped from review as they are similar to previous changes (2)
📝 WalkthroughWalkthroughThe web server now starts without an available agent, retains the selected model, and retries agent creation on demand. Submission failures propagate through chat, goal, automation, and WeChat paths with appropriate responses and cleanup. ChangesWeb agent recovery and submission handling
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to The change keeps the control plane available when a selected model is unavailable and returns actionable service errors without silent fallback. No actionable merge-blocking risk remains after normal checks and review. Sequence Diagram(s)sequenceDiagram
participant WebServer
participant submitMessage
participant Engine
participant Provider
WebServer->>submitMessage: Submit chat or kickoff message
submitMessage->>Engine: ensureAgentAvailable
Engine->>Provider: Create selected model agent
Provider-->>Engine: Agent or authentication error
Engine-->>submitMessage: Availability result
submitMessage-->>WebServer: Session ID and error
WebServer-->>WebServer: Return HTTP 503 on error
Possibly related PRs
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Actionable comments posted: 3
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Inline comments:
In `@internal/command/web_unavailable_model_test.go`:
- Around line 83-84: Replace the direct http.Get/http.Post calls in the test
with a shared http.Client configured with a finite timeout, and use it for both
the status and chat requests. Keep the existing request URLs and response
handling unchanged.
In `@internal/web/chat.go`:
- Line 395: Update the recorder initialization flow around both
session.NewRecorder calls to check and wrap each returned error before using
recorder.UUID(). On either failure, release the running claim, return a
descriptive fmt.Errorf-wrapped error, and ensure the run does not start or
dereference a nil recorder.
- Around line 161-162: Update SubmitMessage and its caller in
internal/command/web.go so failures from the direct s.submitMessage path are
propagated as an error instead of being reduced to a discarded false result.
Preserve successful submissions, and handle the returned error at the channel
boundary with the existing response or acknowledgement mechanism.
🪄 Autofix
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
ℹ️ Review info
⚙️ Run configuration
Configuration used: defaults
Review profile: CHILL
Plan: Pro Plus
Run ID: a5abf3de-af7f-4012-8458-965a164172fa
📒 Files selected for processing (7)
internal/command/web.gointernal/command/web_unavailable_model_test.gointernal/web/approval.gointernal/web/automation_run.gointernal/web/chat.gointernal/web/engine.gointernal/web/engine_availability_test.go
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Review incomplete
No findings were confirmed before review stopped. This is not a clean result.
Summary
Clean. The PR keeps the web/Desktop control plane available when the selected model's agent cannot be constructed at startup (e.g., a managed account needing reauthentication). ensureAgentAvailable uses a correct double-check locking pattern (emu fast-path, then rebuildMu, then emu re-check) whose rebuildMu->emu ordering is consistent with all existing model/mode/role rebuild paths. submitMessage now returns an error and retries agent construction before any history/recorder mutation; all four callers (handleChat, SubmitMessage, handleSetGoal, runAutomation) release the running claim and propagate the error correctly. This also closes a pre-existing nil-agent hazard: previously a cloud provider whose model was unavailable at boot started with agent=nil and would pass nil into runner.Run. The single runner.Run call site is now guarded by ensureAgentAvailable. Verified: go build ./... ok, go vet ok, internal/web and internal/command test suites pass including the two new regression tests.
Incomplete review
This review did not reach a clean conclusion: completion was not reported.
🔍 Checks performed · 12
- read full diff at .git/jcode-review.diff
- read internal/web/engine.go ensureAgentAvailable + applyModelSwitch + agentRevision writes
- read internal/web/chat.go submitMessage and all submitMessage callers
- read internal/web/approval.go handleSetGoal and internal/web/automation_run.go runAutomation
- read internal/command/web.go buildWebTask createAgent + newChatModel
- grepped rebuildMu usages (14 paths) confirming rebuildMu->emu lock order is consistent
- grepped eng.agent / e.agent reads confirming nil can never revert once set
- grepped runner.Run confirming single call site guarded by ensureAgentAvailable
- read internal/providerauth/store.go confirming requires_reauth checked before token refresh
- go build ./... exit 0
- go vet ./internal/web/... ./internal/command/... exit 0
- go test ./internal/web/ and ./internal/command/ (incl. new tests) pass
jcode posts a non-blocking COMMENT review. Merge decisions remain with your team.
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Note
No high-confidence findings
No findings met the configured confidence threshold.
Summary
The PR keeps the web control plane alive when the selected model cannot be built (startup no longer aborts; agent creation is retried lazily per send) and surfaces degraded-channel submission errors instead of swallowing them. Verified no regressions: build, vet, the two new regression tests, and the full internal/web + internal/command + internal/channel suites pass; lock ordering (rebuildMu→emu), running-flag release on every new error path, plan-mode preservation through lazy recovery, and the recorder build-before-close reordering all check out. No verified defects at ≥80% confidence.
🔍 Checks performed · 12
- Installed Go 1.25.8 to ~/.local/go; ran go generate ./internal/model/... and created stub internal/web/dist/index.html (no pnpm in env, per project memory)
- go build ./... — PASS (all packages compile with the new (string, error) submitMessage signature and SubmitMessage contract)
- go test ./internal/web/ -run 'TestEnsureAgentAvailable|TestSubmitMessage' -v — PASS (lazy recovery retry + running-flag release verified)
- go test ./internal/command/ -run 'TestRunWebServerManagedReauthKeepsControlPlaneAvailable' -v — PASS (control plane stays up; both degraded chat attempts return 503 with 'requires reauthentication', proving the running claim is released)
- go test ./internal/web/ -count=1 — PASS (full package, includes mode/computer/mcp lifecycle concurrency tests exercising rebuildMu paths)
- go test ./internal/command/ ./internal/channel/ -count=1 — PASS; go vet on both — clean
- Lock ordering rebuildMu→emu traced across engine.go, automation_run.go, models.go, agents.go, activation.go, skills.go, setup.go, approval.go — no reverse ordering, no deadlock
- running-flag release present on all five new submitMessage error paths; runGen untouched; all CAS callers (handleChat, handleSetGoal, SubmitMessage, runAutomation) verified consistent
- Plan-mode preservation verified: per-task createAgent closure reads currentPlanMode, initialized from the engine's modeStr and updated only under rebuildMu by rebuildForMode (web.go:899/957/972, models.go:400-467, activation.go:311)
- session.NewRecorder (session.go:652) always returns a non-nil recorder and never errors, so the new recorder-error 503 paths are defensive only — no behavior change
- Cloud connector (internal/cloud/connector.go:778-797) converts non-2xx /api/chat into an error result rather than crashing; web/src/lib/api.ts surfaces the JSON error body to the composer
- Workspace grep: only caller of Server.SubmitMessage is the wechat handler in internal/command/web.go
jcode posts a non-blocking COMMENT review. Merge decisions remain with your team.
1 participant
Problem
When the selected model could not be constructed at startup — most notably a managed account whose token expired and needs reauthentication —
runWebServeraborted (or, for cloud providers, degraded to a nil agent). Either way the settings UI served by this same process became unreachable, so the desktop shell had no path to recover: the user could not reauthenticate or switch models.Solution
Model availability no longer gates the control plane:
internal/command/web.go): keep the selected provider/model and log; the settings UI,/api/health, and provider-auth recovery endpoints stay reachable.Engine.ensureAgentAvailable): a degraded engine retries agent construction before the next message, serialized with the normal model/mode rebuild paths so a successful recovery cannot overwrite a concurrent user selection.submitMessagenow returns(sessionID, error): chat, set-goal, automation runs, andSubmitMessagemap failures to HTTP 503, and therunningclaim is released so the session is not wedged behind a false "already processing" conflict.Testing
internal/command/web_unavailable_model_test.go— end-to-end regression: with a managed account flaggedrequires_reauth, the server starts,/api/healthand the provider-auth status endpoint respond, chat returns 503 with the reauthentication error twice in a row (proving the running claim is released), and shutdown is clean.internal/web/engine_availability_test.go—ensureAgentAvailablefails on the first attempt, succeeds after the provider recovers, and skips rebuilding once an agent exists.Summary by CodeRabbit