@habemus-papadum/aiui-test-app

Internal, never published. A deliberately small SolidJS app for exercising the intent client and the channel without the weight of demos/gallery (no workers, no DuckDB, no Mosaic, no multi-page routing).

It fits a mixture of two Gaussians: draw a sample, bin it, measure it, and recover the parameters with EM — five computation cells, four widgets, one file of mathematics.

The graph

samples ──┬─→ histogram ──┐
          │               ├─→ curves
          ├─→ moments ──┐ │
          │             │ │
          └─────────────┴─┴─→ fit ─→ (curves)

cell	kind	what it shows off
samples	async, abortable	ctx.signal + ctx.progress; a slider drag aborts the run in flight
histogram	sync	a cheap derived cell that only some sliders invalidate
moments	sync	a second, independent reading of the same upstream
fit	async iterable	one yield per EM iteration — downstream recomputes per partial
curves	sync	a join of three upstreams; redraws as fit streams

src/model/mixture.ts is pure mathematics — no Solid, no aiui, no async. Everything reactive is in src/model/graph.ts; everything visual is in src/ui/.

No cell writes its own name or loc. The source-locator babel pass (the aiui() plugin in vite.config.ts) injects both at compile time from the declaration, so const samples = cell(…) registers as "samples" and CellView stamps data-cell="samples". Writing them by hand is redundant and goes stale the moment the code moves.

Run it

The point of this app is to drive the wire without a Claude Code session anywhere in the loop. Two terminals:

pnpm test-app:channel   # a standalone debug channel — lowered prompts print to stdout
pnpm test-app           # the app; pick "aiui test app · debug" from the selector

The selector always prompts here: a lone debug channel never auto-selects (select.ts), on the theory that you should have to say out loud that your prompts are going to a terminal instead of an agent. To skip it, name the tag — pnpm test-app --aiui-mcp aiui-test-app.

Arm the overlay with `, say something, press Enter, and the lowered prompt appears in the first terminal between --- lowered prompt --- delimiters. Nothing can reach an agent: the debug server has no MCP transport at all (see aiui-claude-channel serve).

The standalone channel is configured exactly like a session's — aiui mcp serve resolves channel.bind and sidecars.* from config the same way aiui claude does (see packages/aiui/src/util/channel-launch.ts), so it hosts the standard sidecars on its own port.

Against a real session instead, run aiui claude in one terminal and pnpm test-app in another; the selector will offer the real channel.

Agent tools

Registered under the testapp namespace and reachable as page_tools_* MCP tools: get-params, set-params, reseed, plus cells and params report sections.