feat(a2ui): validation checks + client error message (Phase 3 of the v0.9 migration) - #819
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Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
…ntext (Phase 3)
<a2ui-surface> owns the render state store (seed-preserve semantics), so
checks and {path} action-context values resolve against current user input;
failing checks block the event, render inline messages via /_a2uiChecks/<id>
bindings, and emit a VALIDATION_FAILED A2uiErrorMessage.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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This was referenced Aug 17, 2026
feat(a2ui): live sendDataModel round-trip + capabilities helper (Phase 4 of the v0.9 migration)
#820
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Summary
Phase 3 of the A2UI v0.9.1 migration (follows #817, #818): client-side validation per the official
CheckRuleschema, plus a correctness fix that makes event-time values live.@threadplane/a2ui:A2uiCheckcorrected to the official CheckRule shape ({condition: DynamicBoolean, message}); validator functions added to the standard registry —required,regex,length,numeric,email(all linear-time; composable withand/or/not).@threadplane/chat:<a2ui-surface>now owns the renderStateStore(seed-preserve semantics copied from chat-generative-ui) and passes it to<render-spec>, so event-time logic sees current user input. On an event action: every check rule evaluates againstdataModel ∪ store snapshot; failures block the action, write per-component messages to reserved/_a2uiChecks/<id>store paths that checkable catalog inputs bind for reactive inline display, and emit a spec{"error":{"code":"VALIDATION_FAILED",...}}through the newvalidationErroroutput.TextField.validationRegexp(with a bound value) is enforced as an implicit regex rule. Action-context{path}values are now live$bindStatemarkers substituted at dispatch time — fixing the pre-existing gap where contexts froze the agent-seeded snapshot and user-typed values never reached the agent.checks+ validators; docs updated from "typed, not enforced" to shipped semantics; api-docs regenerated.Additive; the only public-type change (
A2uiCheck) was unused before this phase. Plan:docs/superpowers/plans/2026-08-17-a2ui-v09-phase3-checks.md.Verification
libs/a2ui92 unit tests,libs/chat1133 — green; both libs build + lint clean; pytest twins 56 + 23 passednx affected -t lint test build: green except the pre-existingcockpit-telemetry:lintworktree-environment failure (untouched project)🤖 Generated with Claude Code