SEP Phase 3 (SDK + spec): ui/request surface + todo demo#149
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Extension SDK gains the capability-negotiated UI surface: hasUI gating reads the host's ui_capabilities from the initialize handshake, and ctx.ui/smooth.ui speak ui/request (select/confirm/input/notify/setStatus/setWidget/setTitle) back to the host, with -32001 NoUI on a headless frontend. createTestHost gains onUiRequest. Ships the todo demo (widget render block + gated confirm). Extends the spec conformance fixtures with the remaining ui kinds, results, and invalid cases. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Problem
Phase 1/2 gave extensions tools + hooks + events, but no way to render UI. Phase 3 adds the capability-negotiated
ui/requestsurface to the TS SDK and rounds out the spec fixtures.Solution
smooth.hasUI(kind)/ctx.hasUI(kind)read the host'sui_capabilitiesfrom theinitializehandshake;ctx.ui(andsmooth.ui) speakui/requestback to the host —select/confirm/inputreturn the answer (or{ cancelled }),notify/setStatus/setWidget/setTitlepush. Headless host →RpcError-32001 NoUI.createTestHost(ext, { onUiRequest })scripts the host side (default = headless).todo(pi's todo, ported) — a stateful list whose tools push akeyvalueset_widgetrender block and whosecleargates aconfirm, both behindhasUI, so it degrades headless.ui/requestfixtures — the remaining kinds, select/input/cancelled results, and invalid cases.Verification
@smooai/smooth-extension-sdk: typecheck clean; 22 tests green (7 new intest/ui.test.tscovering gating, round-trip, decline, widget, and the headless NoUI reject).@smooai/smooth-operator:extension-conformancegreen — every new valid fixture validates, every invalid one is rejected.Consumes the engine's Phase 3
ui_capabilitiesthreading (smooth-operator-core#27). Hosted by smooth-code +th extin the smooth repo.🤖 Generated with Claude Code