feat(session): surface background shell and subagent work - #360
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📝 WalkthroughWalkthroughThe frontend adds shell lifecycle APIs and cache updates, controls for background work and shell output, status notices for system and synthetic messages, and completion-time handling during session snapshot hydration. ChangesBackground Work and Notices
Transcript Hydration
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
actor User
participant BackgroundWorkBar
participant useBackgroundSession
participant backgroundSession
User->>BackgroundWorkBar: Click background action
BackgroundWorkBar->>useBackgroundSession: Mutate with session ID
useBackgroundSession->>backgroundSession: Call with session ID
Merge Risk: 🟡 Moderate · up to Synthetic messages can disappear from the transcript, while some background-work status and final output may be missed. Resolve the transcript regression before merging. Security Architecture ReviewSecurity architecture risk: 🟡 Moderate · up to A shell output dialog can retain the previous session’s selection after navigation, making output appear in the wrong session context. The new controls use the existing authenticated connection, but ownership checks for shell and session operations could not be verified end to end. Retained concerns
Security review detailsSecurity Blast Radius
Security Findings and Attack Paths
Trust Boundaries and Controls
Resilience and Maintainability Implications
Hardening Proposals
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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🧪 Generate unit tests (beta)
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Actionable comments posted: 4
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In @frontend/src/components/message/MessageThread.tsx:
- Line 571: Update the SessionNotice rendering in MessageThread so shell and
subagent completion updates are announced through a persistent
aria-live="polite" region, while preserving the existing notice behavior for
other messages.
- Line 216: Update sessionNoticeContent so synthetic messages without shell or
subagent metadata fall back to message.text when description is absent; retain
the existing empty-text behavior for shell and subagent notices and the current
system-message fallback.
In @frontend/src/components/message/ToolCallPart.tsx:
- Line 196: Update the user-bash branch in ToolCallPart so backgrounded shell
calls matching userBashCommands render backgroundIndicator before the branch
returns, using a status icon that communicates ongoing background execution
rather than completion.
In @frontend/src/components/session/BackgroundWorkBar.tsx:
- Around line 39-47: Move the in-flight guard from the component-level
loadingRef into the useEffect run that defines load, so each effect run can
perform its own read even while a prior run is finishing. Keep the guard set and
cleared around each load operation.
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📒 Files selected for processing (20)
frontend/src/api/opencode.tsfrontend/src/components/message/MessageThread.test.tsxfrontend/src/components/message/MessageThread.tsxfrontend/src/components/message/ToolCallPart.test.tsxfrontend/src/components/message/ToolCallPart.tsxfrontend/src/components/session/BackgroundWorkBar.test.tsxfrontend/src/components/session/BackgroundWorkBar.tsxfrontend/src/hooks/useOpenCode.tsfrontend/src/hooks/useSSE.test.tsxfrontend/src/hooks/useSSE.tsfrontend/src/hooks/useSessionShells.tsfrontend/src/lib/queryInvalidation.tsfrontend/src/lib/session-projection/applySessionEvent.test.tsfrontend/src/lib/session-projection/applySessionEvent.tsfrontend/src/pages/SessionDetail.tsxfrontend/src/pages/__tests__/SessionDetail.assistant-loading.test.tsxfrontend/src/pages/__tests__/SessionDetail.export.test.tsxfrontend/src/pages/__tests__/SessionDetail.form-prompt.test.tsxfrontend/src/pages/__tests__/SessionDetail.polling.test.tsxfrontend/src/pages/__tests__/SessionDetail.scroll-floating.test.tsx
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Fixes Applied SuccessfullyFixed 6 file(s) based on 4 CodeRabbit feedback item(s), each verified against the current code and approved per-change. Changes:
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Problem
When a shell command or subagent outlived the turn that started it, the session view gave no way to see it still running, follow its output, stop it, or deliberately push long-running work to the background. Completion notices for backgrounded work rendered as raw synthetic payloads (
<shell …>/<subagent …>XML) in the transcript, and an assistant message left open by an execution that ended before its first step stayed stuck as running.Fix
session.background,shell.list,shell.output, andshell.removeto the frontend API facade and auseBackgroundSessionmutation.BackgroundWorkBartoSessionDetail: a "Move to background" action while the active session has running shell/subagent tools, plus an expandable list of the session's running shells with a polled, tail-capped output dialog and kill action.shell.created/shell.exited/shell.deletedin the SSE handler via a sharedshellsQueryKey, and invalidate shells on resync.backgroundbadge and keep the subagent indicator running while backgrounded.Testing
pnpm typecheck: exit 0.pnpm lint: exit 0.pnpm test(frontend): 1468 tests pass (134 files).Summary by CodeRabbit