In-browser WASM playground + site-wide UX/design polish

.github/workflows/playground-wasm.yml

@@ -0,0 +1,77 @@
+name: Playground WASM
+
+# Builds the website playground's WASM bundle whenever the generator changes,
+# publishes it as a public release asset, and bumps website/playground-wasm.lock.
+# The lock-bump commit triggers Vercel's git auto-deploy, whose build fetches
+# the asset via website/scripts/fetch-playground-wasm.mjs. No Vercel secrets.
+#
+# Self-retrigger is impossible by construction: the lock file lives under
+# website/, outside this workflow's path filter.
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - "src/**"
+      - "wasm/**"
+      - "Cargo.toml"
+      - "Cargo.lock"
+      - "scripts/build-playground-wasm.sh"
+  workflow_dispatch:
+
+permissions:
+  contents: write
+
+concurrency:
+  group: playground-wasm
+  cancel-in-progress: false
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  build-and-publish:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          targets: wasm32-unknown-unknown
+      - uses: Swatinem/rust-cache@v2
+      - uses: taiki-e/install-action@v2
+        with:
+          tool: wasm-pack
+
+      - name: Build playground bundle
+        run: ./scripts/build-playground-wasm.sh
+
+      - name: Package and publish release asset
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          set -euo pipefail
+          version=$(cargo metadata --no-deps --format-version 1 \
+            | jq -r '.packages[] | select(.name == "openapi-to-rust") | .version')
+          tag="playground-wasm-${version}-${GITHUB_SHA::7}"
+          tar czf playground-pkg.tar.gz -C website/public/playground pkg
+          gh release create "$tag" playground-pkg.tar.gz \
+            --prerelease \
+            --title "Playground WASM $version (${GITHUB_SHA::7})" \
+            --notes "WASM bundle for openapi-to-rust.dev/playground, built from ${GITHUB_SHA}."
+          echo "$tag" > website/playground-wasm.lock
+
+      - name: Commit lock bump
+        # Pushes back to the ref the workflow ran on: main for the normal
+        # push-triggered flow, the dispatched branch for pre-merge test runs.
+        run: |
+          set -euo pipefail
+          if git diff --quiet -- website/playground-wasm.lock; then
+            echo "lock unchanged; nothing to deploy"
+            exit 0
+          fi
+          git config user.name "github-actions[bot]"
+          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
+          git add website/playground-wasm.lock
+          git commit -m "chore: bump playground wasm to $(cat website/playground-wasm.lock) [skip ci]"
+          git pull --rebase origin "$GITHUB_REF_NAME"
+          git push origin "HEAD:$GITHUB_REF_NAME"

.gitignore

@@ -30,3 +30,8 @@
 /website/dist/
 /website/.astro/
 /website/.vercel/
+
+# Playground WASM bundle: built by scripts/build-playground-wasm.sh locally,
+# published as a GitHub release asset by .github/workflows/playground-wasm.yml
+# and fetched by website/scripts/fetch-playground-wasm.mjs on Vercel.
+/website/public/playground/pkg/

.impeccable/critique/2026-07-18T05-06-10Z__website-src.md

@@ -0,0 +1,54 @@
+---
+target: website/src (playground + site)
+total_score: 25
+p0_count: 2
+p1_count: 3
+timestamp: 2026-07-18T05-06-10Z
+slug: website-src
+---
+Method: dual-agent (A: design review sub-agent · B: detector/browser sub-agent)
+
+# Design Health Score
+
+| # | Heuristic | Score | Key Issue |
+|---|-----------|-------|-----------|
+| 1 | Visibility of System Status | 2 | Generate/example pick before WASM ready is a silent no-op; stale example dropdown label |
+| 2 | Match System / Real World | 3 | YAML parser jargon in errors; otherwise excellent domain copy |
+| 3 | User Control and Freedom | 2 | Failed generate destroys previous result; example pick clobbers pasted spec |
+| 4 | Consistency and Standards | 2 | Unstyled UA-default tab buttons; nested <main>; tablist roles without keyboard pattern |
+| 5 | Error Prevention | 2 | No guard on clobbering user spec; pre-ready clicks eaten |
+| 6 | Recognition Rather Than Recall | 3 | REQUIRED_DEPS.toml leads tab row; otherwise good hints |
+| 7 | Flexibility and Efficiency | 3 | Cmd+Enter, URL fetch, crate download; no permalink |
+| 8 | Aesthetic and Minimalist Design | 3 | 6rem "Playground" h1 pushes Generate below the fold at 900px |
+| 9 | Error Recovery | 2 | line/col given but no editor line numbers; no aria-live |
+| 10 | Help and Documentation | 3 | Strong footer + docs cross-links |
+| **Total** | | **25/40** | **Acceptable** |
+
+# Anti-Patterns Verdict
+Not slop overall: varied composition, evidence-driven copy, coherent print-terminal register. Static detector: 0 findings. In-page detector: 13 findings across 5 pages — hero-eyebrow-chip on 4/5 pages, tiny-text 11.52px on 3 pages, cramped .table-wrap padding on 2, oversized 84px compare h1, long line-length on /playground (~160ch) and /compare (~110ch). The one "looks broken/AI" moment: unstyled native tab buttons on the playground result.
+
+# Priority Issues
+- [P0] Playground output pane clipped ≤900px: tabs/Copy/Download unreachable; `.playground { grid-template-columns: 1fr }` at ≤900px loses minmax(0,…) + `main{overflow:clip}` makes it unscrollable (playground.astro:575, global.css:65).
+- [P0] Docs-layout pages truncate text at 390px: `.doc-shell { grid-template-columns: 1fr }` (global.css:508) needs minmax(0,1fr); verified live.
+- [P1] Result tabs unstyled: JS-created buttons never get data-astro-cid-*, scoped .tab-row rules can't match (playground.astro:212, 528-543). Active tab indistinguishable, ~24px targets.
+- [P1] Silent no-op before worker ready (generate() early-return, playground.astro:243); flagship example path fills textarea then nothing happens.
+- [P1] Nested <main> landmarks (BaseLayout.astro:64 + playground.astro:19).
+- [P2] Homepage never sells the playground; hero CTAs go to docs + anchor only.
+- [P2] Errors invisible to AT (no aria-live/role=alert) and destroy prior result (playground.astro:74-75, 233-240).
+- [P2] Tablist semantics without keyboard behavior; REQUIRED_DEPS.toml first; "1 schemas" pluralization (playground.astro:81, 210-226).
+- [P2] Compare h1 84px breaks product name across lines; page-hero h1 clamp oversized (global.css:338).
+- [P2] Tiny text 11.52px (0.72rem figcaption/footer labels) on 3 pages; doc-pagination 0.66rem.
+- [P3] No JSON-LD on /playground; shared generic og-card. Stale example dropdown label. DocsLayout hardcoded updated-date default. Avenir-only personality on macOS.
+
+# Persona Red Flags
+- Alex: Cmd+Enter swallowed during load → "it's broken" in 5s; role=tab promises arrow keys that don't exist; no shareable permalink.
+- Jordan: REQUIRED_DEPS.toml + "2 schemas · 4 operations" vocabulary; parser-speak errors with no line numbers; example pick destroys pasted work.
+- Casey: mobile playground generates but result is clipped + no scroll-into-view — can't copy/download; docs pages unreadable at 390.
+
+# Minor Observations
+Warning palette untokenized; playground-footer inline-code wraps oddly; 404 page is great; a11y baseline (skip-link, focus-visible, reduced-motion) above average; dev-toolbar 504 is a dev-only artifact.
+
+# Questions
+- Should the playground be the homepage hero's primary demo ("run it on your spec now, nothing uploaded")?
+- Could the error state keep the last good result visible instead of a 480px void?
+- Is "Playground" worth 230px of h1, or should the tool start at the top?

.impeccable/critique/2026-07-18T05-19-10Z__website-src.md

@@ -0,0 +1,33 @@
+---
+target: website/src (playground + site)
+total_score: 37
+p0_count: 0
+p1_count: 1
+timestamp: 2026-07-18T05-19-10Z
+slug: website-src
+---
+Method: dual-agent (A: design review sub-agent · B: detector/browser sub-agent) — round 2, post-fix verification
+
+# Design Health Score
+| # | Heuristic | Score | Key Issue |
+|---|-----------|-------|-----------|
+| 1 | Visibility of System Status | 4 | Loading notice, stale dim, auto-scroll — exemplary |
+| 2 | Match System / Real World | 4 | |
+| 3 | User Control and Freedom | 3 | No clear/reset affordance |
+| 4 | Consistency and Standards | 3 | Site-wide compressHTML missing-space text bug |
+| 5 | Error Prevention | 3 | |
+| 6 | Recognition Rather Than Recall | 4 | |
+| 7 | Flexibility and Efficiency | 4 | |
+| 8 | Aesthetic and Minimalist Design | 4 | |
+| 9 | Error Recovery | 4 | Prev output kept dimmed; exact parse errors |
+| 10 | Help and Documentation | 4 | |
+| **Total** | | **37/40** | **Excellent** |
+
+# Verification
+All 11 round-1 fixes VERIFIED live (incl. pre-WASM-ready notice under 6× CPU throttle). Zero horizontal overflow at 390/768. Detector: static scan clean; oversized-h1 fixed; tiny-text down to 1 element (#comparison-scroll-hint 11.84px); line-length on .playground-footer (~160ch) and .verification-note (~110ch); table-wrap + eyebrow findings accepted in ignore.md.
+
+# Priority Issues
+- [P1] compressHTML strips newlines before inline <a>/<code> → words jam together ("theschema support notes"); 12+ instances / 6 pages. Fix: compressHTML: false in astro.config.mjs.
+- [P3] Compare h1 hyphen-breaks "openapi-to-rust" at 390 → nowrap span.
+- [P3] Screen-reader announcement of playground states (role=alert/status present in source — verify implicit live regions suffice).
+- [P3] scroll-hint 11.84px; playground-footer + verification-note line length.

.impeccable/critique/ignore.md

@@ -0,0 +1,10 @@
+# Accepted / false-positive detector findings
+
+- **hero-eyebrow-chip** (all pages): the mono kicker above page-hero h1s is a deliberate,
+  named brand system used exactly once per page (category label above the h1 in
+  DocsLayout, `.hero-kicker` on the homepage). It is not the per-section eyebrow
+  scaffold the rule targets. Re-flag only if eyebrows start appearing above body
+  sections.
+- **cramped-padding on `.table-wrap`** (/docs/getting-started, /compare/openapi-generator):
+  a table inside a horizontal-scroll container is conventionally flush with the
+  container edges; cells carry their own 0.9rem/1rem padding. Judged intentional.

Cargo.toml

@@ -1,3 +1,9 @@
+[workspace]
+members = ["wasm"]
+# Scratch crates (spec-compile.sh, ad-hoc generator runs) live under tmp/;
+# they must never be adopted into this workspace.
+exclude = ["tmp"]
+
 [package]
 name = "openapi-to-rust"
 version = "0.7.0"
@@ -26,12 +32,13 @@ include = [
 ]
 
 [dependencies]
-clap = { version = "4.5", features = ["derive"] }
+clap = { version = "4.5", features = ["derive"], optional = true }
 once_cell = "1.19"
 prettyplease = "0.2"
 proc-macro2 = "1.0"
 quote = "1.0"
-reqwest = { version = "0.12", default-features = false, features = ["blocking", "rustls-tls"] }
+reqwest = { version = "0.12", default-features = false, features = ["blocking", "rustls-tls"], optional = true }
+url = "2"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 serde_yaml = "0.9"
@@ -50,14 +57,17 @@ insta = { version = "1.41", features = ["yaml"] }
 tempfile = "3.0"
 
 [features]
-default = []
+default = ["cli"]
+cli = ["dep:clap", "dep:reqwest", "http-error"]
+http-error = ["dep:reqwest"]
 internal-tools = []
 specta = ["dep:specta"]
 test-helpers = ["dep:insta", "dep:tempfile"]
 
 [[bin]]
 name = "openapi-to-rust"
 path = "src/bin/openapi-to-rust.rs"
+required-features = ["cli"]
 
 [[bin]]
 name = "catalog-gen"

README.md

@@ -9,6 +9,12 @@
 
 Read the [guides and documentation](https://openapi-to-rust.dev/) for the quickest path from an OpenAPI document to compiling Rust.
 
+## 5-second trial
+
+Paste your spec into the **[browser playground](https://openapi-to-rust.dev/playground)** —
+the real generator compiled to WebAssembly. See the generated Rust instantly and
+download it as a complete, compilable crate. Nothing is uploaded.
+
 ## 30-second trial
 
 Install the CLI from crates.io, then generate a tiny client from a stable,

scripts/build-playground-wasm.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+# Build the playground WASM bundle and stage it for the website.
+#
+# Output: website/public/playground/pkg/ (gitignored build artifact).
+# wasm-pack runs wasm-opt -Oz itself (configured in wasm/Cargo.toml), and the
+# env vars below give the release profile size-focused settings without
+# touching the workspace profile used by the CLI.
+set -euo pipefail
+cd "$(dirname "$0")/.."
+
+DEST="website/public/playground/pkg"
+
+CARGO_PROFILE_RELEASE_OPT_LEVEL=z \
+CARGO_PROFILE_RELEASE_LTO=true \
+CARGO_PROFILE_RELEASE_CODEGEN_UNITS=1 \
+  wasm-pack build wasm --release --target web --out-dir "../$DEST"
+
+# Mark the bundle as a local build so fetch-playground-wasm.mjs never
+# clobbers it with the lock-pinned release asset.
+echo "local" > "$DEST/.source-tag"
+
+echo
+echo "Playground WASM staged in $DEST:"
+ls -lh "$DEST" | awk 'NR>1 {print "  " $9 " (" $5 ")"}'

scripts/spec-compile.sh

@@ -138,6 +138,10 @@ EOF
     continue
   fi
   {
+    # Empty [workspace] keeps the scratch crate out of the repo's workspace;
+    # without it cargo walks up, finds the root manifest, and refuses.
+    echo "[workspace]"
+    echo
     echo "[package]"
     echo "name = \"spec-compile-$name\""
     echo "version = \"0.0.0\""