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feat(automation): screen-flow runtime — interactive screen nodes (suspend→render→resume) - #1452
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…pend→render→resume)
A `screen` node with input fields now suspends the run on entry (reusing the
ADR-0019 durable pause), surfaces a ScreenSpec for the client to render, and
resumes with the collected values applied as bare flow variables so downstream
nodes read them via `{var}`. Completes the screen-flow arm of the engine that
previously left `screen` nodes as no-op pass-throughs (the showcase Reassign
Wizard's input was never collected → `apply` failed).
- spec: AutomationResult.screen, ResumeSignal.variables (bare vars),
IAutomationService.getSuspendedScreen.
- service-automation: screen executor builds the ScreenSpec + suspends when
fields present (waitForInput:false forces pass-through); suspend/resume
threads screen through FlowSuspendSignal → SuspendedRun → paused result;
resume() applies signal.variables as bare vars; getSuspendedScreen getter.
+2 unit tests.
- runtime: POST /automation/:name/runs/:runId/resume + GET .../screen, wired in
both the dispatcher route table and handleAutomation.
- docs/design/screen-flow-runtime.md.
Verified headless end-to-end: showcase Reassign Wizard launch → pause at screen
→ resume with new_assignee → task reassigned. objectui FlowRunner ships next.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Move the Reassign wizard action to `list_item` (+ keep `list_toolbar`) and relabel to "Reassign…" so the row's recordId flows into the screen flow — the wizard collects `new_assignee` and writes it back to that task. Exercises the screen-flow runtime end-to-end in the showcase.
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What
Completes the screen-flow arm of the automation engine. A
screennode with input fields now suspends the run on entry (reusing the ADR-0019 durable pause), surfaces aScreenSpecfor the client to render, and resumes with the collected values applied as bare flow variables (so downstream nodes read{new_assignee}etc.). Previouslyscreennodes were no-op pass-throughs — the showcase Reassign Wizard's input was never collected and itsapplystep failed.AutomationResult.screen,ResumeSignal.variables(bare vars),IAutomationService.getSuspendedScreen.ScreenSpecand suspends when fields are present (waitForInput:falseforces pass-through); suspend/resume threads the screen throughFlowSuspendSignal → SuspendedRun → paused result;resume()setssignal.variablesas bare vars;getSuspendedScreengetter. +2 unit tests.POST /api/v1/automation/:name/runs/:runId/resume(body{ inputs }) +GET …/runs/:runId/screen, wired in both the dispatcher route table (dispatcher-plugin) andhandleAutomation.Verification (headless, end-to-end)
Showcase Reassign Wizard against the running backend:
launch → { status:'paused', runId, screen:{nodeId:'collect', fields:[new_assignee]} }→resume { inputs:{ new_assignee:'casey@example.com' } } → completed→ task reassigned (sam→casey).Tests: service-automation 107 ✓, runtime 329 ✓, spec 6609 ✓.
Follow-up
The objectui
FlowRunnerthat renders these screens (and wires the launch action to open it) ships as a separate objectui PR.