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+# Phase 35: npx buildthis CLI - Research
+
+**Researched:** 2026-04-01
+**Domain:** Node.js CLI packaging, npx entrypoints, hardware detection, interactive terminal UX
+**Confidence:** HIGH
+
+---
+
+<user_constraints>
+## User Constraints (from CONTEXT.md)
+
+### Locked Decisions
+None — all implementation choices are at Claude's discretion.
+
+### Claude's Discretion
+All implementation choices are at Claude's discretion.
+
+### Deferred Ideas (OUT OF SCOPE)
+None.
+</user_constraints>
+
+<phase_requirements>
+## Phase Requirements
+
+| ID | Description | Research Support |
+|----|-------------|------------------|
+| CLI-01 | User can run `npx buildthis` to bootstrap Nexus from scratch | `buildthis` package with `bin.buildthis` pointing to CLI entry; detects running instance vs fresh install path |
+| CLI-02 | CLI bootstrapper detects hardware and walks through same provider tiering as web onboarding | Hardware detection via inline `os` module (no `systeminformation` needed for Apple Silicon; GPU probe optional) + provider tiering display mirrored from web onboarding |
+</phase_requirements>
+
+---
+
+## Summary
+
+Phase 35 introduces a standalone `npx buildthis` entrypoint — a developer-facing bootstrapper that a user can run on a fresh machine without having cloned the repo. When invoked it follows two distinct paths: if Nexus is already running on the default port (3100) it opens the browser immediately; if not, it walks the user through hardware-aware provider selection (matching the web onboarding Phase 30-32 logic) and then calls the existing `paperclipai onboard --run` flow.
+
+The `buildthis` npm package is a new, minimal package under `packages/buildthis/` (or as a second `bin` entry on the existing `paperclipai` package — see Architecture Patterns). It bundles its own tiny entry with esbuild, following the same pattern as `cli/`. Hardware detection can be done entirely with the Node.js built-in `os` module for Apple Silicon (no `systeminformation` needed at the CLI layer) and a 3-second `si.graphics()` probe for GPU — or, if Nexus is running, by calling `GET /system/providers` directly. The second approach is simpler and avoids adding `systeminformation` to the `buildthis` package.
+
+The hardest design question is where `buildthis` lives: as a new `packages/buildthis/` workspace, or as a second `bin` on the existing `cli/package.json`. The new package approach is cleaner for users (`npx buildthis` vs `npx paperclipai buildthis`) and avoids leaking all of `paperclipai`'s heavy dependencies into a lightweight bootstrapper download.
+
+**Primary recommendation:** Create `packages/buildthis/` as a new, minimal workspace package with `bin: { buildthis: "./dist/index.js" }`, a single `src/index.ts` entry, and a thin esbuild build. Hardware detection uses inline `os` + optional `systeminformation` (already in monorepo) for the local probe path.
+
+---
+
+## Standard Stack
+
+### Core
+| Library | Version | Purpose | Why Standard |
+|---------|---------|---------|--------------|
+| `@clack/prompts` | `^0.10.0` | Interactive terminal prompts (spinners, select, text, confirm) | Already used across all `cli/` commands; consistent UX |
+| `commander` | `^13.1.0` | CLI argument parsing | Already used in `cli/`; mature, zero-dep |
+| `picocolors` | `^1.1.1` | Terminal colouring | Already used in `cli/`; smallest colour lib |
+| `open` | `^11.0.0` | Open URLs in the default browser | Already used in `@paperclipai/server` for `PAPERCLIP_OPEN_ON_LISTEN`; same version |
+| `systeminformation` | `5` | GPU detection (VRAM probe) | Already used in `@paperclipai/server`; pinned to v5 per project decision |
+
+### Supporting
+| Library | Version | Purpose | When to Use |
+|---------|---------|---------|-------------|
+| `esbuild` | workspace devDep | Bundle to single `dist/index.js` | Build step, same pattern as `cli/esbuild.config.mjs` |
+| `tsx` | `^4.19.2` | Dev mode entrypoint (`pnpm dev`) | Dev only, same pattern as `cli/` |
+
+### Alternatives Considered
+| Instead of | Could Use | Tradeoff |
+|------------|-----------|----------|
+| New `packages/buildthis/` package | Second `bin` on `cli/package.json` | `cli/` is 1.8 MB unpacked with many deps; `buildthis` should be a lightweight download — separate package wins |
+| Inline `os`-only hardware detection | Call running server's `/system/providers` | If server is not yet running, we need local detection; use local probe first, server probe as fallback |
+| `systeminformation` for GPU | Skip GPU detection in `buildthis` | GPU detection is part of CLI-02; include it but behind the same 3-second `Promise.race` timeout pattern |
+
+**Installation (new package):**
+```bash
+pnpm add @clack/prompts commander picocolors open systeminformation --filter buildthis
+```
+
+**Version verification (confirmed 2026-04-01):**
+- `@clack/prompts`: 1.2.0 (latest)
+- `commander`: 14.0.3 (latest; `^13.1.0` in cli — update to `^14.0.0` or pin to `^13.1.0` for consistency)
+- `picocolors`: 1.1.1 (latest)
+- `open`: 11.0.0 (latest)
+- `systeminformation`: 5.31.5 (latest v5)
+
+---
+
+## Architecture Patterns
+
+### Recommended Project Structure
+```
+packages/buildthis/
+├── package.json          # name: "buildthis", bin: { buildthis: "./dist/index.js" }
+├── tsconfig.json         # extends ../../tsconfig.base.json
+├── esbuild.config.mjs    # mirror of cli/esbuild.config.mjs, single entry
+├── src/
+│   ├── index.ts          # CLI entry: program setup + default command = bootstrapCommand
+│   ├── bootstrap.ts      # main logic: detect-running → open, or guide-install → open
+│   ├── hardware.ts       # inline hardware detection (copied from server/src/services/hardware.ts)
+│   └── banner.ts         # printBuildthisBanner (mirrors cli/src/utils/banner.ts)
+└── dist/                 # gitignored, built artifact
+```
+
+### Pattern 1: npx entrypoint — `bin` field
+**What:** npm `bin` field maps a command name to a file. When `npx buildthis` is run, npm downloads the package and executes `./dist/index.js` directly.
+**When to use:** Any time you want `npx <name>` to work without global install.
+**Example:**
+```json
+// packages/buildthis/package.json
+{
+  "name": "buildthis",
+  "bin": { "buildthis": "./dist/index.js" },
+  "files": ["dist"],
+  "publishConfig": { "access": "public" }
+}
+```
+The bundled `dist/index.js` **must** have a `#!/usr/bin/env node` shebang — the esbuild `banner.js` option injects this automatically (see `cli/esbuild.config.mjs`).
+
+### Pattern 2: Detect running instance before prompting
+**What:** Probe `http://127.0.0.1:<port>/api/health` first. Port is read from config if config exists, else try the default 3100.
+**When to use:** `buildthis`'s primary happy path — "already running, just open browser."
+**Example:**
+```typescript
+// Source: onboard.ts bootstrapNexusAgents() health-check pattern
+async function probeRunningInstance(port: number): Promise<boolean> {
+  try {
+    const res = await fetch(`http://127.0.0.1:${port}/api/health`, { signal: AbortSignal.timeout(2000) });
+    return res.ok;
+  } catch {
+    return false;
+  }
+}
+```
+Health URL: `http://127.0.0.1:<port>/api/health` — confirmed from `server/src/app.ts` (mounted at `/api/health`).
+
+### Pattern 3: Hardware detection — inline os + systeminformation
+**What:** Same logic as `server/src/services/hardware.ts`. Apple Silicon path uses only `os` module (no `systeminformation` call). GPU path uses `si.graphics()` with a 3-second `Promise.race` timeout.
+**When to use:** CLI-02 requirement — detect tier before presenting provider options.
+**Example:**
+```typescript
+// Source: server/src/services/hardware.ts (copy-adapted for buildthis)
+import os from "node:os";
+import si from "systeminformation";
+
+export type HardwareTier = "gpu" | "apple_silicon" | "cpu_only";
+
+export async function detectHardware(): Promise<{ tier: HardwareTier; totalGb: number }> {
+  const totalGb = Math.round(os.totalmem() / (1024 ** 3) * 10) / 10;
+  const cpuModel = os.cpus()[0]?.model ?? null;
+
+  if (process.platform === "darwin" && cpuModel?.startsWith("Apple")) {
+    return { tier: "apple_silicon", totalGb };
+  }
+
+  try {
+    const result = await Promise.race([
+      si.graphics(),
+      new Promise<never>((_, reject) => setTimeout(() => reject(new Error("timeout")), 3000)),
+    ]);
+    const vramGb = (result.controllers[0]?.vram ?? 0) / 1024;
+    if (vramGb >= 4) return { tier: "gpu", totalGb };
+  } catch { /* fallthrough to cpu_only */ }
+
+  return { tier: "cpu_only", totalGb };
+}
+```
+
+### Pattern 4: Provider tiering display (CLI-02)
+**What:** After hardware detection, present the same tier-appropriate options as the web wizard:
+- GPU / Apple Silicon: recommend local Ollama + show top model from catalog
+- Any tier: offer Puter (zero-config), Google OAuth, API key
+- CPU-only: up-front note that cloud AI is recommended
+
+**When to use:** Second path (no running instance, fresh install).
+
+**CLI display pattern (clack/prompts):**
+```typescript
+import * as p from "@clack/prompts";
+
+p.log.info(`Hardware: ${tier} | RAM: ${totalGb} GB`);
+const provider = await p.select({
+  message: "Choose a starting provider",
+  options: [
+    { value: "puter", label: "Puter -- free, zero-config", hint: "No API key needed" },
+    { value: "google", label: "Google -- Gemini free tier", hint: "Sign in with Google" },
+    { value: "apikey", label: "API key -- subscription provider", hint: "OpenAI, Anthropic, Groq" },
+    ...(tier !== "cpu_only" ? [{ value: "local", label: "Local AI (Ollama)", hint: "Private, offline" }] : []),
+    { value: "skip", label: "Skip for now" },
+  ],
+});
+```
+
+### Pattern 5: Delegating to `paperclipai onboard --run`
+**What:** After provider guidance, `buildthis` hands off to the existing `paperclipai onboard` or `paperclipai run` flow. This avoids duplicating the full install logic.
+**Constraint:** `buildthis` cannot `import` from `@paperclipai/*` workspace packages — it is a standalone public package. It must invoke `paperclipai` as a subprocess via `child_process.spawn` (if already installed) or guide the user to install it first.
+
+**Key decision:** `buildthis` is a *bootstrapper*, not a full CLI. Its job ends when it either opens the browser or tells the user the next command to run. It does NOT embed the full install logic.
+
+### Pattern 6: Browser open
+**What:** Use `open` package to launch the browser.
+**Example:**
+```typescript
+import open from "open";
+await open(`http://127.0.0.1:${port}`);
+```
+Server already uses `open` via dynamic import; `buildthis` can use it as a static dependency.
+
+### Anti-Patterns to Avoid
+- **Bundling `@paperclipai/server` into `buildthis`:** Server is 1.8 MB+ and has native deps (embedded postgres). `buildthis` must stay small — it's what `npx` downloads on a fresh machine.
+- **Skipping hardware detection on first path:** Even when Nexus is already running, CLI-02 says hardware detection must be part of the flow. If server is running, call `GET /system/providers` instead of local probe — avoids adding `systeminformation` at all.
+- **Using `PAPERCLIP_OPEN_ON_LISTEN` env pattern:** That pattern is for the server process. `buildthis` opens the browser itself after confirming the server is listening.
+- **Blocking forever on GPU probe:** Must use the 3-second `Promise.race` timeout, same as `server/src/services/hardware.ts`.
+
+---
+
+## Don't Hand-Roll
+
+| Problem | Don't Build | Use Instead | Why |
+|---------|-------------|-------------|-----|
+| Terminal prompts | Custom readline | `@clack/prompts` | Already used project-wide; handles TTY edge cases, cancellation, piped input |
+| Terminal colour | ANSI escape codes | `picocolors` | Tree-shakeable, no deps, already project standard |
+| Browser open | Platform-specific shell commands | `open@11` | Handles macOS/Linux/Windows correctly; already in server |
+| GPU VRAM detection | Custom WMI/system calls | `systeminformation@5` | Handles cross-platform GPU probing; project already uses v5 |
+| CLI arg parsing | Manual `process.argv` | `commander` | Already project standard; handles flags, help, errors |
+
+**Key insight:** `buildthis` can be very thin — 200-300 lines of TypeScript. Every heavy problem is already solved by existing project libraries.
+
+---
+
+## Common Pitfalls
+
+### Pitfall 1: `buildthis` name already taken on npm
+**What goes wrong:** `npm publish` fails with E403 because `buildthis` is registered.
+**Why it happens:** `buildthis` (404 on npm as of 2026-04-01 — confirmed) is not registered, but this can change.
+**How to avoid:** `npm view buildthis` returned 404 — name is available. Reserve it early by publishing the package.
+**Warning signs:** `npm error 403` during publish.
+
+### Pitfall 2: `#!/usr/bin/env node` shebang missing from dist
+**What goes wrong:** `npx buildthis` runs but produces "Permission denied" or "SyntaxError: Unexpected token #".
+**Why it happens:** esbuild doesn't add the shebang automatically unless configured.
+**How to avoid:** In `esbuild.config.mjs`, set `banner: { js: "#!/usr/bin/env node" }` — same as `cli/esbuild.config.mjs`. Also run `chmod +x dist/index.js` in build script.
+**Warning signs:** `permission denied` from npx; file doesn't start with `#!/usr/bin/env node`.
+
+### Pitfall 3: `AbortSignal.timeout` not available on old Node.js
+**What goes wrong:** `AbortSignal.timeout(2000)` throws `TypeError: AbortSignal.timeout is not a function` on Node 16.
+**Why it happens:** `AbortSignal.timeout` was added in Node 17.3.
+**How to avoid:** Target Node 20 in esbuild config (`target: "node20"`). Project already uses `node20` in `cli/esbuild.config.mjs`. Add `"engines": { "node": ">=20" }` to `package.json`.
+**Warning signs:** Errors on Node 16/18.
+
+### Pitfall 4: `systeminformation` native bindings in esbuild bundle
+**What goes wrong:** `systeminformation` includes platform-specific binaries that esbuild can't bundle; build succeeds but crashes at runtime.
+**Why it happens:** Some `systeminformation` functions use optional native bindings.
+**How to avoid:** Mark `systeminformation` as `external` in esbuild config (same as how `cli/esbuild.config.mjs` handles all npm deps). It will be a regular `node_modules` dependency, not bundled.
+**Warning signs:** `Cannot find module` errors for `.node` files at runtime.
+
+### Pitfall 5: Health URL path confusion
+**What goes wrong:** Probing the wrong URL — `http://127.0.0.1:3100/health` instead of `/api/health`.
+**Why it happens:** The server mounts health at `/api/health` (inside the `api` router at `app.ts:237`) not `/health`.
+**How to avoid:** Use `http://127.0.0.1:${port}/api/health` — confirmed from `server/src/app.ts` line 237 + 138.
+**Warning signs:** 404 on health probe even when server is running.
+
+### Pitfall 6: Non-TTY environments (CI, piped input)
+**What goes wrong:** `@clack/prompts` hangs or crashes when stdin is not a TTY.
+**Why it happens:** Interactive prompts require a TTY.
+**How to avoid:** Check `process.stdin.isTTY && process.stdout.isTTY` before entering interactive mode (same guard used in `onboard.ts:395`). In non-TTY, print instructions and exit 0.
+**Warning signs:** `buildthis` hanging in CI.
+
+---
+
+## Code Examples
+
+### Detect running instance
+```typescript
+// Source: adapted from cli/src/commands/onboard.ts bootstrapNexusAgents()
+async function probeRunningInstance(port: number): Promise<boolean> {
+  try {
+    const res = await fetch(`http://127.0.0.1:${port}/api/health`, {
+      signal: AbortSignal.timeout(2000),
+    });
+    return res.ok;
+  } catch {
+    return false;
+  }
+}
+```
+
+### Read port from existing config (if present)
+```typescript
+// Source: pattern from cli/src/config/store.ts + cli/src/config/schema.ts
+import { configExists, readConfig } from "./config/store.js";
+
+function resolveNexusPort(): number {
+  const DEFAULT_PORT = 3100;
+  try {
+    if (configExists()) {
+      const config = readConfig();
+      return config?.server?.port ?? DEFAULT_PORT;
+    }
+  } catch { /* config parse error — use default */ }
+  return DEFAULT_PORT;
+}
+```
+
+Note: `buildthis` cannot import from workspace packages directly. It must either replicate the config-reading logic inline or accept that it only checks port 3100. The simplest approach: probe 3100 only. Config path resolution is an advanced feature for a v2.
+
+### Hardware detection (server GET /system/providers fallback)
+```typescript
+// If server is running, use its hardware endpoint instead of local probe
+async function fetchHardwareFromServer(port: number): Promise<HardwareInfo | null> {
+  try {
+    const res = await fetch(`http://127.0.0.1:${port}/system/providers`, {
+      signal: AbortSignal.timeout(3000),
+    });
+    if (res.ok) return res.json() as Promise<HardwareInfo>;
+  } catch { /* server not running */ }
+  return null;
+}
+```
+
+### esbuild config for buildthis
+```javascript
+// Source: modelled on cli/esbuild.config.mjs
+export default {
+  entryPoints: ["src/index.ts"],
+  bundle: true,
+  platform: "node",
+  target: "node20",
+  format: "esm",
+  outfile: "dist/index.js",
+  banner: { js: "#!/usr/bin/env node" },
+  external: [
+    "systeminformation",  // native bindings — must stay external
+    "open",               // uses dynamic import internally
+  ],
+  treeShaking: true,
+  sourcemap: true,
+};
+```
+
+---
+
+## Runtime State Inventory
+
+> Skipped — this is a greenfield package creation phase. No rename, refactor, or migration involved.
+
+---
+
+## Environment Availability
+
+| Dependency | Required By | Available | Version | Fallback |
+|------------|------------|-----------|---------|----------|
+| Node.js 20+ | Build + runtime | ✓ | Linux 6.17.4 / node present | — |
+| pnpm | Workspace management | ✓ | workspace in use | — |
+| npm registry | `npx buildthis` resolution | ✓ (confirmed `paperclipai` 2026.325.0 live) | — | publish step is manual |
+| `systeminformation` v5 | GPU detection | ✓ (in server/node_modules) | 5.31.5 | Apple Silicon + cpu_only paths work without it |
+| `open` v11 | Browser open | ✓ (in server/node_modules) | 11.0.0 | Print URL to console as fallback |
+| `@clack/prompts` | Interactive prompts | ✓ (in cli/node_modules) | 1.2.0 | — |
+
+**Missing dependencies with no fallback:** None.
+
+**Missing dependencies with fallback:** None — all required packages already exist in the monorepo.
+
+---
+
+## Validation Architecture
+
+### Test Framework
+| Property | Value |
+|----------|-------|
+| Framework | vitest 2.x (workspace project) |
+| Config file | `packages/buildthis/vitest.config.ts` (Wave 0 gap — doesn't exist yet) |
+| Quick run command | `npx vitest run packages/buildthis/src/__tests__/` |
+| Full suite command | `npx vitest run` |
+
+### Phase Requirements → Test Map
+| Req ID | Behavior | Test Type | Automated Command | File Exists? |
+|--------|----------|-----------|-------------------|-------------|
+| CLI-01 | `probeRunningInstance` returns true when server responds 200 | unit | `npx vitest run packages/buildthis/src/__tests__/bootstrap.test.ts` | ❌ Wave 0 |
+| CLI-01 | `probeRunningInstance` returns false when port closed / timeout | unit | `npx vitest run packages/buildthis/src/__tests__/bootstrap.test.ts` | ❌ Wave 0 |
+| CLI-02 | `detectHardware` returns `apple_silicon` on darwin + Apple CPU | unit | `npx vitest run packages/buildthis/src/__tests__/hardware.test.ts` | ❌ Wave 0 |
+| CLI-02 | `detectHardware` returns `cpu_only` when GPU probe times out | unit | `npx vitest run packages/buildthis/src/__tests__/hardware.test.ts` | ❌ Wave 0 |
+| CLI-02 | Provider options include local AI only for non-cpu_only tiers | unit | `npx vitest run packages/buildthis/src/__tests__/bootstrap.test.ts` | ❌ Wave 0 |
+
+### Sampling Rate
+- **Per task commit:** `npx vitest run packages/buildthis/src/__tests__/`
+- **Per wave merge:** `npx vitest run`
+- **Phase gate:** Full suite green before `/gsd:verify-work`
+
+### Wave 0 Gaps
+- [ ] `packages/buildthis/vitest.config.ts` — vitest project config
+- [ ] `packages/buildthis/src/__tests__/bootstrap.test.ts` — covers CLI-01 (probe, open, non-TTY guard)
+- [ ] `packages/buildthis/src/__tests__/hardware.test.ts` — covers CLI-02 (tier detection by platform/CPU/GPU)
+
+---
+
+## State of the Art
+
+| Old Approach | Current Approach | When Changed | Impact |
+|--------------|------------------|--------------|--------|
+| Single binary with all logic | Thin bootstrapper + delegates to heavy CLI | Phase 35 | `buildthis` stays small (~200KB bundle) |
+| Hardware detection only in server | Hardware detection available in CLI layer | Phase 35 | No server needed for pre-install guidance |
+
+**Deprecated/outdated:**
+- None relevant to this phase.
+
+---
+
+## Open Questions
+
+1. **Should `buildthis` invoke `paperclipai` as a subprocess, or just print instructions?**
+   - What we know: `buildthis` cannot bundle `@paperclipai/*` workspace packages; subprocess invoke requires `paperclipai` to be installed globally or via docker.
+   - What's unclear: Is `paperclipai` expected to be installed alongside `buildthis`, or is `buildthis` truly a fresh-machine bootstrapper?
+   - Recommendation: Print clear next-step instructions (`npx paperclipai@latest onboard` or `npm install -g paperclipai && paperclipai run`) rather than spawning a subprocess. This is simpler and more reliable.
+
+2. **Should the `buildthis` package version track the `paperclipai` version?**
+   - What we know: `paperclipai` uses date-based versioning (2026.MDD.P). `buildthis` is a different package.
+   - What's unclear: Whether both should be published together in the same release script.
+   - Recommendation: Start with independent versioning (0.1.0); add to the release script in a follow-up. The release script in `scripts/release.sh` only handles `cli/`.
+
+3. **Where does `buildthis` live in the workspace — `packages/buildthis/` or `cli-bootstrap/`?**
+   - What we know: `pnpm-workspace.yaml` includes `packages/*`.
+   - What's unclear: Naming convention preference.
+   - Recommendation: `packages/buildthis/` — consistent with workspace layout; `packages/*` is already in workspace glob.
+
+---
+
+## Sources
+
+### Primary (HIGH confidence)
+- `cli/src/index.ts` — Commander registration, `onboard` and `run` command wiring
+- `cli/src/commands/onboard.ts` — Full interactive onboard flow, health-check pattern, `bootstrapNexusAgents`
+- `cli/src/commands/run.ts` — `runCommand` implementation, server start, `PAPERCLIP_OPEN_ON_LISTEN`
+- `cli/esbuild.config.mjs` — esbuild bundle strategy, shebang pattern, external deps
+- `cli/package.json` — Exact dependency versions, build/publish setup
+- `server/src/services/hardware.ts` — Hardware detection logic (Apple Silicon path, GPU probe, 3-second timeout)
+- `server/src/app.ts` — Health route mounted at `/api/health` (line 237 + 138 confirmation)
+- `server/src/index.ts` — `PAPERCLIP_OPEN_ON_LISTEN` env var + `open` package usage
+- `pnpm-workspace.yaml` — Workspace package globs
+- `scripts/build-npm.sh` — CLI build pipeline steps
+
+### Secondary (MEDIUM confidence)
+- npm registry check: `buildthis` package name — confirmed 404 (available) as of 2026-04-01
+- npm registry check: `paperclipai` — confirmed published at 2026.325.0
+
+### Tertiary (LOW confidence)
+- None.
+
+---
+
+## Metadata
+
+**Confidence breakdown:**
+- Standard stack: HIGH — all libraries already in use in project; versions confirmed via `npm view`
+- Architecture: HIGH — based on direct codebase inspection; patterns copied from existing `cli/` implementation
+- Pitfalls: HIGH — derived from existing code patterns and confirmed npm registry state
+
+**Research date:** 2026-04-01
+**Valid until:** 2026-05-01 (stable domain; npm package availability could change sooner)