Phase 3 W4: applied-demo runner (cloudflare/dmv)#33
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W4 of the web demo. Add /api/demos and /api/run-demo/:name, which run the real demo-agent loop over a real scenario and the genuine fail-closed tools (Cloudflare migration, CA DMV registration), returning the tool-call trace and the authoritative tool decisions. The model is a deterministic mock by default — offline, no key, safe for a public site; a live model stays a local opt-in, and the eval suites cover the misbehaving-model cases. The client gains an Applied demos tab showing the ordered tool calls next to the tool decisions, making the security property visible: the model orchestrates, but the tools decide — the verdict is never the model's prose. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Stacks on #32 (W3). Base is
phase-3-w3-sd-ui; merge #32 first.What (W4 of the web-demo plan)
Run the applied demos in the browser.
Server (2 new endpoints):
GET /api/demos— list the applied demos (cloudflare,dmv).POST /api/run-demo/:name— run the genuinerunAgentloop over a real scenario and the fail-closed tools, returning the tool-call trace, the authoritative tool decisions (captured server-side viaonToolResult), and the agent's final text.The model is a deterministic mock that issues the demo's tool sequence — offline, no key, safe for a public site. A live model stays a local opt-in (mock-only public, per the plan); the eval suites already cover misbehaving-model cases.
Client: an Applied demos tab showing the ordered tool calls beside the tool decisions, making the core property visible — the model orchestrates, the tools decide; the verdict is never the model's prose.
Tests
demoRunner.test.js— 5 integration cases viaapp.inject: lists demos, runs DMV (granted viaregister_vehicle, real confirmation number), runs Cloudflare (verify → stage → approve → cutover authorized), 404 for unknown demo, and a key-material canary over the whole trace.npm run typecheck+npm run lintclean; web suite 28 passing; client builds clean. Live-smoke-tested: DMV runs, granted, no key leak.W5 (polish + deploy doc + README "Try it") is the last slice.
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