Html Diagram
- 2.1k installs
- 1.6k repo stars
- Updated August 3, 2026
- plannotator/effective-html
html-diagram is an agent skill for create a self-contained html file for visualizing architecture and understanding the stack with a high-quality svg diagram. use when the user wants a full-screen diagram, wants.
About
The html-diagram skill is designed for create a self-contained HTML file for visualizing architecture and understanding the stack with a high-quality SVG diagram. Use when the user wants a full-screen diagram, wants. HTML Diagram Review the SVG diagrams used throughout references/html-effectiveness/. There are a bunch in there, and some of them are focused on architecture and whatnot. Invoke when the user the user wants a full-screen diagram, wants the output to be light on prose, or wants an HTML artifact that is mostly there to make the architecture click fast.
- Create a self-contained HTML file for visualizing architecture and understanding the stack with a high-quality SVG diagr
- User the user wants a full-screen diagram, wants the output to be light on prose, or wants an HTML artifact that is most
- Developers using html diagram workflows documented in SKILL.md.
Html Diagram by the numbers
- 2,136 all-time installs (skills.sh)
- +246 installs in the week ending Aug 5, 2026 (Skillselion tracking)
- Ranked #134 of 1,880 Design & UI/UX skills by installs in the Skillselion catalog
- Data as of Aug 5, 2026 (Skillselion catalog sync)
html-diagram capabilities & compatibility
- Capabilities
- create a self contained html file for visualizin · user the user wants a full screen diagram, wants · developers using html diagram workflows document
- Use cases
- frontend
What html-diagram says it does
Create a self-contained HTML file for visualizing architecture and understanding the stack with a high-quality SVG diagram. Use when the user wants a full-screen diagram, wants the
Create a self-contained HTML file for visualizing architecture and understanding the stack with a high-quality SVG diagram. Use when the user wants a full-scree
npx skills add https://github.com/plannotator/effective-html --skill html-diagramAdd your badge
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| Installs | 2.1k |
|---|---|
| repo stars | ★ 1.6k |
| Last updated | August 3, 2026 |
| Repository | plannotator/effective-html ↗ |
How do I create a self-contained html file for visualizing architecture and understanding the stack with a high-quality svg diagram. use when the user wants a full-screen diagram, wants?
Create a self-contained HTML file for visualizing architecture and understanding the stack with a high-quality SVG diagram. Use when the user wants a full-screen diagram, wants.
Who is it for?
Developers using html diagram workflows documented in SKILL.md.
Skip if: Skip when the task falls outside html-diagram scope or needs a different stack.
When should I use this skill?
User the user wants a full-screen diagram, wants the output to be light on prose, or wants an HTML artifact that is mostly there to make the architecture click fast.
What you get
Completed html-diagram workflow with documented commands, files, and expected deliverables.
- self-contained HTML file
- embedded SVG architecture diagram
Files
HTML Diagram
Review the SVG diagrams used throughout references/html-effectiveness/.
There are a bunch in there, and some of them are focused on architecture and whatnot.
After reviewing them, create an HTML file that is strictly for visualizing the architecture and understanding the stack.
It should not be prose-heavy. It should simplify more into a full-screen diagram and whatnot.
Build a high-quality diagram in SVG. Take your time iterating on the diagram more than anything.
If it makes sense, make the diagram interactive and able to visualize and animate different sequences of system behavior.
Also review references/architecture-example.html — a finished example of this skill done well (full-screen SVG stage, clickable nodes, flow chips that light up and animate request paths).
Always include dark mode: hand-rolled CSS variables on :root / html.dark, a small theme toggle button, localStorage persistence, and an apply-before-paint script in <head> (default to prefers-color-scheme). Style the SVG through CSS classes using those variables — never hard-coded hex inside the SVG — so the diagram follows the theme.
interface:
display_name: "HTML Diagram"
short_description: "Create effective standalone HTML diagrams"
default_prompt: "Use $html-diagram to create a polished architecture diagram."
policy:
allow_implicit_invocation: false
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Workspaces — Architecture</title>
<script>
(function () {
const saved = localStorage.getItem('theme');
const dark = saved ? saved === 'dark' : matchMedia('(prefers-color-scheme: dark)').matches;
document.documentElement.classList.toggle('dark', dark);
})();
</script>
<style>
:root {
--bg: #FAF9F5; --surface: #FFFFFF; --surface2: #F0EEE6;
--ink: #141413; --body: #3D3D3A; --muted: #87867F;
--line: #D1CFC5; --line-soft: #E6E3DA;
--clay: #D97757; --clay-soft: rgba(217,119,87,0.10);
--olive: #788C5D; --olive-soft: rgba(120,140,93,0.12);
--gold: #C9A45C; --blue: #5B7E96;
--zone: rgba(20,20,19,0.025); --zone-line: #D1CFC5;
--serif: ui-serif, Georgia, "Times New Roman", serif;
--sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
--mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}
html.dark {
--bg: #141413; --surface: #1F1F1D; --surface2: #2A2A28;
--ink: #FAF9F5; --body: #D1CFC5; --muted: #87867F;
--line: #3D3D3A; --line-soft: #2A2A28;
--clay: #E48A6E; --clay-soft: rgba(228,138,110,0.14);
--olive: #9DB07C; --olive-soft: rgba(157,176,124,0.16);
--gold: #D4B36F; --blue: #7FA3BC;
--zone: rgba(250,249,245,0.03); --zone-line: #3D3D3A;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
body {
background: var(--bg); color: var(--body); font-family: var(--sans);
-webkit-font-smoothing: antialiased; display: flex; flex-direction: column; overflow: hidden;
}
/* ── top bar ─────────────────────────────── */
.bar {
display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
padding: 12px 20px; border-bottom: 1px solid var(--line-soft); flex: none;
}
.bar h1 { font-family: var(--serif); font-weight: 500; font-size: 19px; color: var(--ink); letter-spacing: -0.01em; }
.bar .sub { font-family: var(--mono); font-size: 10.5px; color: var(--muted); letter-spacing: 0.06em; text-transform: uppercase; }
.spacer { flex: 1; }
.chips { display: flex; gap: 6px; flex-wrap: wrap; }
.chip {
font-family: var(--mono); font-size: 11px; letter-spacing: 0.04em;
padding: 5px 11px; border: 1px solid var(--line); border-radius: 999px;
background: transparent; color: var(--muted); cursor: pointer; transition: all .15s ease;
}
.chip:hover { color: var(--ink); border-color: var(--muted); }
.chip.on { background: var(--ink); border-color: var(--ink); color: var(--bg); }
#themeToggle {
font-family: var(--mono); font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.08em;
padding: 5px 10px; border: 1px solid var(--line); border-radius: 6px;
background: transparent; color: var(--muted); cursor: pointer;
}
#themeToggle:hover { color: var(--ink); border-color: var(--muted); }
/* ── stage ───────────────────────────────── */
.stage { flex: 1; position: relative; min-height: 0; }
.stage svg { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
/* zones */
.zone rect { fill: var(--zone); stroke: var(--zone-line); stroke-width: 1; stroke-dasharray: 5 5; rx: 16; }
.zone .ztitle { font-family: var(--mono); font-size: 12px; letter-spacing: 0.1em; text-transform: uppercase; fill: var(--muted); }
.zone .zsub { font-family: var(--mono); font-size: 10.5px; fill: var(--muted); opacity: 0.75; }
/* nodes */
.node { cursor: pointer; }
.node rect { fill: var(--surface); stroke: var(--line); stroke-width: 1.5; rx: 10; transition: stroke .15s ease, filter .15s ease; }
.node:hover rect { stroke: var(--muted); }
.node.sel rect { stroke: var(--clay) !important; stroke-width: 2; }
.node .t { font-family: var(--sans); font-size: 14.5px; font-weight: 600; fill: var(--ink); pointer-events: none; }
.node .m { font-family: var(--mono); font-size: 11px; fill: var(--muted); pointer-events: none; }
.node .k { font-family: var(--mono); font-size: 10px; letter-spacing: 0.08em; text-transform: uppercase; fill: var(--clay); pointer-events: none; }
.node.gate rect { fill: var(--clay-soft); stroke: var(--clay); }
.node.store rect { fill: var(--surface2); }
.node.do rect { fill: var(--olive-soft); stroke: var(--olive); }
.node.ext rect { stroke-dasharray: 6 3; }
/* edges */
.edge { stroke: var(--muted); stroke-width: 1.6; fill: none; marker-end: url(#a-mut); transition: opacity .2s ease, stroke .2s ease; }
.edge.dash { stroke-dasharray: 5 4; }
.edge.ws { stroke-width: 2; }
.elbl { font-family: var(--mono); font-size: 10.5px; fill: var(--muted); transition: opacity .2s ease; }
/* flow highlighting */
.stage.flowing .edge { opacity: 0.13; }
.stage.flowing .elbl { opacity: 0.13; }
.stage.flowing .node { opacity: 0.30; }
.stage.flowing .zone { opacity: 0.45; }
.stage.flowing .edge.lit {
opacity: 1; stroke: var(--clay); marker-end: url(#a-clay);
stroke-dasharray: 7 5; animation: march 0.9s linear infinite;
}
.stage.flowing .elbl.lit { opacity: 1; fill: var(--clay); }
.stage.flowing .node.lit { opacity: 1; }
.stage.flowing .node.lit rect { stroke: var(--clay); }
@keyframes march { to { stroke-dashoffset: -12; } }
@media (prefers-reduced-motion: reduce) { .stage.flowing .edge.lit { animation: none; } }
.badge { font-family: var(--mono); font-size: 11px; font-weight: 700; }
.badge circle { fill: var(--clay); }
.badge text { fill: var(--bg); }
.stage:not(.flowing) .badge { display: none; }
/* ── floating cards ──────────────────────── */
.card {
position: absolute; max-width: 360px;
background: var(--surface); border: 1px solid var(--line); border-radius: 12px;
padding: 14px 16px; box-shadow: 0 6px 24px rgba(0,0,0,0.08);
}
#detail { right: 16px; bottom: 16px; width: 340px; }
#detail h3 { font-family: var(--serif); font-weight: 500; font-size: 17px; color: var(--ink); margin-bottom: 2px; }
#detail .meta { font-family: var(--mono); font-size: 10.5px; color: var(--muted); margin-bottom: 8px; }
#detail p { font-size: 12.5px; line-height: 1.55; }
#detail p code, #flowcap code { font-family: var(--mono); font-size: 11px; color: var(--clay); }
#flowcap { left: 16px; bottom: 16px; max-width: 460px; display: none; }
#flowcap.show { display: block; }
#flowcap .fname { font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--clay); margin-bottom: 6px; }
#flowcap ol { margin-left: 18px; }
#flowcap li { font-size: 12.5px; line-height: 1.55; }
.src { position: absolute; top: 10px; right: 16px; font-family: var(--mono); font-size: 10px; color: var(--muted); opacity: 0.8; }
@media (max-width: 880px) {
body { overflow: auto; }
.stage { min-height: 70vh; }
#detail { position: static; width: auto; margin: 10px 16px; }
#flowcap { position: static; margin: 0 16px 16px; }
}
</style>
</head>
<body>
<div class="bar">
<div>
<h1>Workspaces — the stack</h1>
<div class="sub">two workers · four backends · one access gate</div>
</div>
<div class="spacer"></div>
<div class="chips" id="chips">
<button class="chip on" data-flow="all">Everything</button>
<button class="chip" data-flow="create">Create</button>
<button class="chip" data-flow="live">Live edit</button>
<button class="chip" data-flow="agent">Agent edit</button>
<button class="chip" data-flow="read">Public read</button>
<button class="chip" data-flow="login">Login</button>
<button class="chip" data-flow="render">HTML render</button>
</div>
<button id="themeToggle">Theme</button>
</div>
<div class="stage" id="stage">
<svg viewBox="0 0 1560 980" preserveAspectRatio="xMidYMid meet" role="img" aria-label="Workspaces platform architecture diagram">
<defs>
<marker id="a-mut" viewBox="0 0 10 10" refX="9" refY="5" markerWidth="6.5" markerHeight="6.5" orient="auto-start-reverse">
<path d="M0,0 L10,5 L0,10 z" style="fill: var(--muted)"/>
</marker>
<marker id="a-clay" viewBox="0 0 10 10" refX="9" refY="5" markerWidth="6.5" markerHeight="6.5" orient="auto-start-reverse">
<path d="M0,0 L10,5 L0,10 z" style="fill: var(--clay)"/>
</marker>
</defs>
<!-- ── zones ─────────────────────────────── -->
<g class="zone" id="z-clients">
<rect x="40" y="120" width="250" height="600"/>
<text class="ztitle" x="60" y="150">Clients</text>
<text class="zsub" x="60" y="168">same API for all three</text>
</g>
<g class="zone" id="z-app">
<rect x="330" y="120" width="470" height="640"/>
<text class="ztitle" x="350" y="150">App Worker</text>
<text class="zsub" x="350" y="168">workspaces.plannotator.ai · Hono · one deploy</text>
</g>
<g class="zone" id="z-do">
<rect x="840" y="400" width="260" height="350"/>
<text class="ztitle" x="860" y="428">Durable Objects</text>
</g>
<g class="zone" id="z-back">
<rect x="1140" y="120" width="380" height="640"/>
<text class="ztitle" x="1160" y="150">Backends</text>
<text class="zsub" x="1160" y="168">one source of truth per data type</text>
</g>
<!-- ── edges ─────────────────────────────── -->
<path class="edge" id="e-spa" d="M265,206 C 310,204 322,212 355,212"/>
<path class="edge" id="e-createB" d="M265,240 C 312,248 318,290 355,296"/>
<path class="edge" id="e-createA" d="M265,372 C 315,362 318,310 355,308"/>
<path class="edge ws" id="e-ws" d="M265,258 C 308,296 308,470 355,515"/>
<path class="edge" id="e-authres" d="M555,300 L575,300"/>
<path class="edge" id="e-reshand" d="M675,335 L675,385"/>
<path class="edge" id="e-handd1" d="M775,415 C 950,415 1040,335 1165,330"/>
<path class="edge" id="e-handbr" d="M675,455 L675,505"/>
<path class="edge" id="e-brdo" d="M775,537 L865,537"/>
<path class="edge" id="e-pardo" d="M455,569 C 455,600 770,602 812,588 C 845,576 852,568 865,562"/>
<path class="edge" id="e-docoord" d="M970,575 L970,620"/>
<path class="edge" id="e-coordart" d="M1075,650 C 1115,650 1135,500 1165,478"/>
<path class="edge" id="e-coordd1" d="M1075,690 C 1135,690 1148,392 1165,350"/>
<path class="edge" id="e-viss" d="M265,542 C 310,548 315,630 355,650"/>
<path class="edge" id="e-skv" d="M775,672 C 950,800 1110,790 1165,640"/>
<path class="edge dash" id="e-kvart" d="M1330,560 L1330,520"/>
<path class="edge" id="e-authwos" d="M775,205 C 950,186 1040,186 1165,196"/>
<path class="edge dash" id="e-jwks" d="M455,265 C 480,247 900,242 1165,228"/>
<path class="edge dash" id="e-iframe" d="M115,273 C 75,420 70,852 355,852"/>
<path class="edge" id="e-ucart" d="M775,845 C 1020,845 1130,690 1165,505"/>
<!-- edge labels -->
<text class="elbl" data-e="e-spa" x="296" y="192">loads the app</text>
<text class="elbl" data-e="e-createA" x="280" y="396">Bearer wsk_live_…</text>
<text class="elbl" data-e="e-ws" x="320" y="444">WebSocket · Yjs</text>
<text class="elbl" data-e="e-handd1" x="935" y="380" text-anchor="middle">metadata reads / writes</text>
<text class="elbl" data-e="e-brdo" x="820" y="526" text-anchor="middle">init-safe</text>
<text class="elbl" data-e="e-pardo" x="640" y="592" text-anchor="middle">upgrade → same DO</text>
<text class="elbl" data-e="e-docoord" x="958" y="604" text-anchor="end">checkpoint · 2–10s debounce</text>
<text class="elbl" data-e="e-coordart" x="1155" y="466" text-anchor="end">git push</text>
<text class="elbl" data-e="e-coordd1" x="1152" y="372" text-anchor="end">commits → D1</text>
<text class="elbl" data-e="e-skv" x="798" y="712">pointer check + cached body</text>
<text class="elbl" data-e="e-kvart" x="1342" y="545">cold miss · readAt(sha)</text>
<text class="elbl" data-e="e-authwos" x="960" y="176" text-anchor="middle">hosted login redirect</text>
<text class="elbl" data-e="e-jwks" x="920" y="226" text-anchor="middle">JWKS · verified at the edge</text>
<text class="elbl" data-e="e-iframe" x="150" y="838">sandboxed iframe</text>
<text class="elbl" data-e="e-ucart" x="980" y="864" text-anchor="middle">reads blobs @sha</text>
<!-- ── nodes: clients ────────────────────── -->
<g class="node" data-k="browser">
<rect x="65" y="178" width="200" height="95"/>
<text class="t" x="85" y="208">Browser</text>
<text class="m" x="85" y="230">Vite + React SPA</text>
<text class="m" x="85" y="248">session cookie · WebSocket</text>
</g>
<g class="node" data-k="agent">
<rect x="65" y="330" width="200" height="95"/>
<text class="t" x="85" y="360">Agent / CLI</text>
<text class="m" x="85" y="382">curl + API key</text>
<text class="m" x="85" y="400">same /v1 surface, HTTP only</text>
</g>
<g class="node" data-k="visitor">
<rect x="65" y="500" width="200" height="85"/>
<text class="t" x="85" y="530">Anyone with a link</text>
<text class="m" x="85" y="552">no account · no cookie</text>
<text class="m" x="85" y="570">the link is the keys</text>
</g>
<!-- ── nodes: app worker ─────────────────── -->
<g class="node" data-k="spa">
<rect x="355" y="185" width="200" height="60"/>
<text class="t" x="375" y="210">Static assets</text>
<text class="m" x="375" y="230">SPA shell · edge-cached</text>
</g>
<g class="node" data-k="authroutes">
<rect x="575" y="185" width="200" height="60"/>
<text class="t" x="595" y="210">/auth/*</text>
<text class="m" x="595" y="230">login · callback · logout</text>
</g>
<g class="node" data-k="authenticate">
<rect x="355" y="265" width="200" height="70"/>
<text class="t" x="375" y="292">authenticate</text>
<text class="m" x="375" y="312">session | api key | anon</text>
<text class="m" x="375" y="326">→ one Identity</text>
</g>
<g class="node gate" data-k="resolve">
<rect x="575" y="265" width="200" height="70"/>
<text class="t" x="595" y="292">resolveAccess()</text>
<text class="k" x="595" y="312">the one gate</text>
<text class="m" x="595" y="326">open·public·private·org</text>
</g>
<g class="node" data-k="handlers">
<rect x="355" y="385" width="420" height="70"/>
<text class="t" x="375" y="412">/v1 route handlers</text>
<text class="m" x="375" y="434">documents · workspaces · comments · versions · keys · me</text>
</g>
<g class="node" data-k="parties">
<rect x="355" y="505" width="200" height="64"/>
<text class="t" x="375" y="530">/parties/* WS door</text>
<text class="m" x="375" y="552">onBeforeConnect → gate</text>
</g>
<g class="node" data-k="bridge">
<rect x="575" y="505" width="200" height="64"/>
<text class="t" x="595" y="530">agent edit bridge</text>
<text class="m" x="595" y="552">applyAgentEdit() RPC</text>
</g>
<g class="node" data-k="spub">
<rect x="355" y="625" width="420" height="64"/>
<text class="t" x="375" y="650">/s/* public reads</text>
<text class="m" x="375" y="672">cookieless · cacheable · never mounts authenticate</text>
</g>
<!-- ── nodes: durable objects ────────────── -->
<g class="node do" data-k="docdo">
<rect x="865" y="445" width="210" height="130"/>
<text class="t" x="885" y="475">Document DO</text>
<text class="m" x="885" y="497">one per document</text>
<text class="m" x="885" y="515">Yjs merge · live fan-out</text>
<text class="m" x="885" y="533">SQLite hot tier</text>
<text class="m" x="885" y="555">humans + agents, one writer</text>
</g>
<g class="node do" data-k="coorddo">
<rect x="865" y="620" width="210" height="110"/>
<text class="t" x="885" y="650">Workspace coordinator</text>
<text class="m" x="885" y="672">one per workspace · lazy</text>
<text class="m" x="885" y="690">sole pusher to the repo</text>
<text class="m" x="885" y="708">expiry alarm</text>
</g>
<!-- ── nodes: backends ───────────────────── -->
<g class="node ext" data-k="workos">
<rect x="1165" y="178" width="330" height="80"/>
<text class="t" x="1185" y="208">WorkOS</text>
<text class="m" x="1185" y="230">identity · hosted AuthKit · orgs</text>
<text class="m" x="1185" y="246">we store only IDs</text>
</g>
<g class="node store" data-k="d1">
<rect x="1165" y="280" width="330" height="100"/>
<text class="t" x="1185" y="310">D1</text>
<text class="m" x="1185" y="332">metadata source of truth</text>
<text class="m" x="1185" y="350">workspaces · documents · annotations</text>
<text class="m" x="1185" y="366">api_keys · commits projection</text>
</g>
<g class="node store" data-k="artifacts">
<rect x="1165" y="420" width="330" height="100"/>
<text class="t" x="1185" y="450">Cloudflare Artifacts</text>
<text class="m" x="1185" y="472">content + version history</text>
<text class="m" x="1185" y="490">one git repo per workspace</text>
<text class="m" x="1185" y="506">docs as files · version = blob SHA</text>
</g>
<g class="node store" data-k="kv">
<rect x="1165" y="560" width="330" height="100"/>
<text class="t" x="1185" y="590">KV + Cache API</text>
<text class="m" x="1185" y="612">visibility pointer (fail-closed)</text>
<text class="m" x="1185" y="630">public body cache · JWKS cache</text>
<text class="m" x="1185" y="646">reconstructible only — never truth</text>
</g>
<!-- ── usercontent worker ────────────────── -->
<g class="node ext" data-k="usercontent">
<rect x="355" y="810" width="420" height="80"/>
<text class="t" x="375" y="838">usercontent Worker</text>
<text class="m" x="375" y="858">separate domain · cookieless</text>
<text class="m" x="375" y="874">untrusted HTML can never touch a login</text>
</g>
</svg>
<div class="src">research/ARCHITECTURE.md v2 · spec.yaml 0.13.0</div>
<div class="card" id="flowcap">
<div class="fname" id="f-name"></div>
<ol id="f-steps"></ol>
</div>
<div class="card" id="detail">
<h3 id="d-title">Click anything</h3>
<div class="meta" id="d-meta">node detail</div>
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agent: { t:"Agent / CLI", m:"client · Bearer wsk_live_…", b:"Claude Code, curl, scripts. <b>Same endpoints, same gate, same documents</b> as the UI — an agent edits over HTTP and its change merges live into the same Yjs doc humans are typing in." },
visitor: { t:"Anyone with a link", m:"client · no credential", b:"The growth engine. An <code>open</code> workspace's link grants view+edit with no account; <code>public</code> grants view. No tokens, no claim — the link is the keys." },
spa: { t:"Static assets", m:"app worker · edge-cached", b:"The SPA shell. <code>run_worker_first</code> pins <code>/v1 /s /auth /parties</code> to the Worker so API calls never fall through to <code>index.html</code>." },
authroutes:{ t:"/auth/*", m:"app worker · browser-only", b:"Thin redirects to WorkOS hosted login; the callback seals an encrypted session cookie. Scripts never come here — they use API keys." },
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resolve: { t:"resolveAccess()", m:"the ONE authorization gate", b:"A pure function — workspace row + identity → view / edit / no (and 404 hides existence). HTTP routes, the WebSocket door, and the agent bridge all call <b>this same function</b>. Nothing else decides access." },
handlers: { t:"/v1 route handlers", m:"Hono · JSON + markdown", b:"The whole product surface: documents, folder-tree workspaces, comments, version history & restore, duplicate, API keys, <code>/v1/me</code>. Everything the UI can do, an agent can do here." },
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bridge: { t:"Agent edit bridge", m:"getServerByName().applyAgentEdit()", b:"After the gate passes, an agent's PUT/PATCH bridges into the <b>same Document DO</b> via init-safe RPC. The edit merges through Yjs and broadcasts to live editors instantly — one writer, no second path." },
spub: { t:"/s/* public reads", m:"cookieless · cacheable", b:"The hot path. Never mounts authenticate, never wakes a DO: a KV visibility pointer gates (fail-closed), then the body serves from edge cache. Checkpoint-fresh (~10s), like Google Docs published links." },
docdo: { t:"Document DO", m:"durable object · one per document", b:"The live document. Browsers sync over WebSocket, agents write over RPC — <b>all merge in one Yjs doc</b>. SQLite hot tier makes edits durable between checkpoints; debounced checkpoints flow to the coordinator." },
coorddo: { t:"Workspace coordinator", m:"durable object · one per workspace", b:"Born lazily at the first save. The <b>only thing that pushes to the workspace's git repo</b> (structural single-writer), updates the D1 commits projection inline, and owns the expiry alarm. Cold during browsing." },
workos: { t:"WorkOS", m:"external · identity", b:"Hosted login (email, Google, GitHub), users, organizations. We mirror nothing but IDs; membership and org come from the verified JWT. SSO/SCIM are a config flip later, not a rewrite." },
d1: { t:"D1", m:"SQL · metadata source of truth", b:"One database: workspaces (ownership + visibility), documents (paths), annotations, hashed API keys, and the commits projection (history keyed by <b>document id</b>, so renames never lose it)." },
artifacts: { t:"Cloudflare Artifacts", m:"git · content source of truth", b:"One repo per workspace; each document is a file. Every save-point is a commit; the API's <code>version</code> is the file's content fingerprint (blob SHA). History, restore, and <code>?version=</code> reads all come from here." },
kv: { t:"KV + Cache API", m:"cache · reconstructible only", b:"The visibility pointer (checked before any cached body — switch-to-private fails closed), the public body cache, and the JWKS cache. Nothing here is ever a source of truth." },
usercontent:{ t:"usercontent Worker", m:"separate registrable domain", b:"Serves rendered/authored HTML from a cookieless second origin, embedded in the app as a sandboxed iframe. Untrusted HTML runs code — origin isolation means it can never reach anyone's session. Non-retrofittable, so it ships day one." },
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name: "Create — no signup wall",
edges: ["e-createA","e-authres","e-reshand","e-handd1"],
nodes: ["agent","browser","authenticate","resolve","handlers","d1"],
steps: ["<code>POST /v1/documents</code> — anonymous or with a key","One D1 batch insert: workspace + document rows","<code>201</code> with the share link. No DO, no repo yet — <code>version: null</code> until the first save"]
},
live: {
name: "Live edit — human in the browser",
edges: ["e-spa","e-ws","e-pardo","e-docoord","e-coordart","e-coordd1"],
nodes: ["browser","spa","parties","docdo","coorddo","artifacts","d1"],
steps: ["SPA opens a WebSocket per document","The door runs the same gate, hands the socket to the Document DO","Keystrokes merge via Yjs; SQLite makes them durable","Every 2–10s the coordinator commits a save-point to git"]
},
agent: {
name: "Agent edit — curl as a collaborator",
edges: ["e-createA","e-authres","e-reshand","e-handbr","e-brdo","e-docoord","e-coordart","e-coordd1"],
nodes: ["agent","authenticate","resolve","handlers","bridge","docdo","coorddo","artifacts","d1"],
steps: ["<code>PUT /v1/…/documents/{id}</code> with a bearer key","Same gate as everyone, then an init-safe RPC into the document's DO","The edit Yjs-merges and broadcasts to live humans instantly","<code>If-Match</code> compares against the live content — no polling, honest <code>412</code>s"]
},
read: {
name: "Public read — the growth engine",
edges: ["e-viss","e-skv","e-kvart"],
nodes: ["visitor","spub","kv","artifacts"],
steps: ["<code>GET /s/{slug}</code> — no cookie, no auth, no DO","KV pointer says open/public (fail-closed on private)","Body serves from edge cache; cold miss reads the git blob once"]
},
login: {
name: "Login — hosted, sealed, edge-verified",
edges: ["e-createB","e-authwos","e-jwks"],
nodes: ["browser","authroutes","authenticate","workos"],
steps: ["<code>/auth/login</code> redirects to WorkOS hosted sign-in","Callback seals an encrypted session cookie","Every later request verifies the JWT against a cached JWKS — zero WorkOS calls on the hot path"]
},
render: {
name: "HTML render — untrusted code, isolated",
edges: ["e-iframe","e-ucart"],
nodes: ["browser","usercontent","artifacts"],
steps: ["The app embeds <code>rendered_url</code> as a sandboxed iframe","A cookieless Worker on a separate domain serves the HTML","Cross-origin + sandbox: the document's code can never touch a login"]
}
};
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document.getElementById('f-steps').innerHTML = f.steps.map(s => `<li>${s}</li>`).join('');
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nodes.forEach(n => n.addEventListener('click', () => {
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</body>
</html>
<!-- Copyright 2026 Anthropic PBC · SPDX-License-Identifier: Apache-2.0 -->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Debounced search — three approaches</title>
<style>
:root {
--ivory: #FAF9F5;
--slate: #141413;
--clay: #D97757;
--oat: #E3DACC;
--olive: #788C5D;
--gray-150: #F0EEE6;
--gray-300: #D1CFC5;
--gray-500: #87867F;
--gray-700: #3D3D3A;
--white: #FFFFFF;
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--mono: ui-monospace, 'SF Mono', Menlo, Monaco, monospace;
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* { margin: 0; padding: 0; box-sizing: border-box; }
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background: var(--ivory);
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max-width: 1360px;
margin: 0 auto;
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font-size: 12px;
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margin-bottom: 12px;
}
h1 {
font-family: var(--serif);
font-weight: 500;
font-size: 38px;
line-height: 1.15;
color: var(--slate);
margin-bottom: 18px;
letter-spacing: -0.01em;
}
.prompt-box {
background: var(--gray-150);
border: 1.5px solid var(--gray-300);
border-radius: 12px;
padding: 16px 20px;
font-size: 14.5px;
color: var(--gray-700);
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font-size: 11px;
text-transform: uppercase;
letter-spacing: 0.06em;
color: var(--gray-500);
display: block;
margin-bottom: 6px;
}
/* ---------- approach grid ---------- */
.approaches {
display: grid;
grid-template-columns: repeat(3, minmax(0, 1fr));
gap: 28px;
margin-bottom: 56px;
}
@media (max-width: 1100px) {
.approaches { grid-template-columns: 1fr; }
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.approach {
background: var(--white);
border: 1.5px solid var(--gray-300);
border-radius: 12px;
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.approach-head h2 {
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/* ---------- code panel ---------- */
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.code .str { color: var(--olive); } /* strings */
.code .cm { color: var(--gray-500); } /* comments */
.code .fn { color: #C9B98A; } /* identifiers, subtle warm */
/* ---------- tradeoffs table ---------- */
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font-size: 13px;
}
.tradeoffs .row {
display: grid;
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}
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.tradeoffs .con::before {
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width: 6px;
height: 6px;
border-radius: 50%;
margin-right: 8px;
vertical-align: 2px;
}
.tradeoffs .pro::before { background: var(--olive); }
.tradeoffs .con::before { background: var(--clay); }
/* ---------- chip footer ---------- */
.chips {
display: flex;
flex-wrap: wrap;
gap: 8px;
}
.chip {
font-family: var(--mono);
font-size: 11.5px;
background: var(--gray-150);
border: 1.5px solid var(--gray-300);
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border-radius: 8px;
white-space: nowrap;
}
.chip strong { color: var(--slate); font-weight: 600; }
/* ---------- recommendation ---------- */
.reco {
border-left: 4px solid var(--clay);
background: var(--white);
border-radius: 0 12px 12px 0;
padding: 24px 28px;
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font-size: 22px;
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}
.reco code {
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font-size: 0.92em;
background: var(--gray-150);
padding: 1px 6px;
border-radius: 4px;
}
</style>
</head>
<body>
<div class="page">
<header class="page-head">
<div class="eyebrow">Exploration · Acme web client</div>
<h1>Three ways to implement debounced search</h1>
<div class="prompt-box">
<span class="label">Prompt</span>
Show me three different ways to implement debounced search for the task
filter input in our React codebase, with tradeoffs for each.
</div>
</header>
<!-- ============================================================= -->
<section class="approaches">
<!-- ---------- Approach 1 ---------- -->
<article class="approach">
<header class="approach-head">
<h2><span class="num">01</span>Inline useEffect + setTimeout</h2>
<p>Debounce logic lives directly inside the component that owns the input.</p>
</header>
<div class="code"><pre><span class="kw">export function</span> <span class="fn">TaskSearch</span>() {
<span class="kw">const</span> [draft, setDraft] = <span class="fn">useState</span>(<span class="str">''</span>);
<span class="kw">const</span> [query, setQuery] = <span class="fn">useState</span>(<span class="str">''</span>);
<span class="fn">useEffect</span>(() <span class="kw">=></span> {
<span class="kw">const</span> id = <span class="fn">setTimeout</span>(() <span class="kw">=></span> setQuery(draft), <span class="str">300</span>);
<span class="kw">return</span> () <span class="kw">=></span> <span class="fn">clearTimeout</span>(id);
}, [draft]);
<span class="kw">const</span> { data } = <span class="fn">useTasks</span>({ search: query });
<span class="kw">return</span> (
<<span class="fn">input</span>
value={draft}
onChange={(e) <span class="kw">=></span> setDraft(e.target.value)}
placeholder=<span class="str">"Filter tasks…"</span>
/>
);
}</pre></div>
<div class="tradeoffs">
<div class="row head">
<div class="cell">Pro</div>
<div class="cell">Con</div>
</div>
<div class="row">
<div class="cell pro">Zero new abstractions to learn</div>
<div class="cell con">Logic duplicated everywhere search exists</div>
</div>
<div class="row">
<div class="cell pro">Easy to step through in devtools</div>
<div class="cell con">Two pieces of state for one conceptual value</div>
</div>
<div class="row">
<div class="cell pro">No dependency or bundle change</div>
<div class="cell con">Delay constant is buried in component body</div>
</div>
</div>
<div class="chips">
<span class="chip">Bundle impact: <strong>+0 kb</strong></span>
<span class="chip">Testability: <strong>medium</strong></span>
<span class="chip">Reuse: <strong>low</strong></span>
<span class="chip">SSR safe: <strong>yes</strong></span>
</div>
</article>
<!-- ---------- Approach 2 ---------- -->
<article class="approach">
<header class="approach-head">
<h2><span class="num">02</span>Custom useDebounce hook</h2>
<p>Extract the timer into a shared hook under <code style="font-family:var(--mono)">src/hooks/</code>.</p>
</header>
<div class="code"><pre><span class="cm">// src/hooks/useDebounce.ts</span>
<span class="kw">export function</span> <span class="fn">useDebounce</span><T>(value: T, ms = <span class="str">300</span>): T {
<span class="kw">const</span> [debounced, setDebounced] = <span class="fn">useState</span>(value);
<span class="fn">useEffect</span>(() <span class="kw">=></span> {
<span class="kw">const</span> id = <span class="fn">setTimeout</span>(() <span class="kw">=></span> setDebounced(value), ms);
<span class="kw">return</span> () <span class="kw">=></span> <span class="fn">clearTimeout</span>(id);
}, [value, ms]);
<span class="kw">return</span> debounced;
}
<span class="cm">// TaskSearch.tsx</span>
<span class="kw">const</span> [draft, setDraft] = <span class="fn">useState</span>(<span class="str">''</span>);
<span class="kw">const</span> query = <span class="fn">useDebounce</span>(draft, <span class="str">300</span>);
<span class="kw">const</span> { data } = <span class="fn">useTasks</span>({ search: query });</pre></div>
<div class="tradeoffs">
<div class="row head">
<div class="cell">Pro</div>
<div class="cell">Con</div>
</div>
<div class="row">
<div class="cell pro">Single import reused across filter, command bar, board search</div>
<div class="cell con">One more file to maintain and document</div>
</div>
<div class="row">
<div class="cell pro">Trivial to unit test with fake timers</div>
<div class="cell con">Generic <code style="font-family:var(--mono)">T</code> hides intent slightly</div>
</div>
<div class="row">
<div class="cell pro">Delay is a visible, tunable argument</div>
<div class="cell con">Still re-renders on every keystroke</div>
</div>
</div>
<div class="chips">
<span class="chip">Bundle impact: <strong>+0.2 kb</strong></span>
<span class="chip">Testability: <strong>high</strong></span>
<span class="chip">Reuse: <strong>high</strong></span>
<span class="chip">SSR safe: <strong>yes</strong></span>
</div>
</article>
<!-- ---------- Approach 3 ---------- -->
<article class="approach">
<header class="approach-head">
<h2><span class="num">03</span>Tiny external library</h2>
<p>Adopt <code style="font-family:var(--mono)">use-debounce</code> for both values and callbacks.</p>
</header>
<div class="code"><pre><span class="kw">import</span> { useDebouncedCallback }
<span class="kw">from</span> <span class="str">'use-debounce'</span>;
<span class="kw">export function</span> <span class="fn">TaskSearch</span>() {
<span class="kw">const</span> [query, setQuery] = <span class="fn">useState</span>(<span class="str">''</span>);
<span class="kw">const</span> onChange = <span class="fn">useDebouncedCallback</span>(
(next: <span class="kw">string</span>) <span class="kw">=></span> setQuery(next),
<span class="str">300</span>,
{ leading: <span class="kw">false</span>, maxWait: <span class="str">1000</span> },
);
<span class="kw">const</span> { data } = <span class="fn">useTasks</span>({ search: query });
<span class="kw">return</span> (
<<span class="fn">input</span>
defaultValue=<span class="str">""</span>
onChange={(e) <span class="kw">=></span> onChange(e.target.value)}
/>
);
}</pre></div>
<div class="tradeoffs">
<div class="row head">
<div class="cell">Pro</div>
<div class="cell">Con</div>
</div>
<div class="row">
<div class="cell pro">leading / trailing / maxWait handled for us</div>
<div class="cell con">New runtime dependency to audit and update</div>
</div>
<div class="row">
<div class="cell pro">Callback form skips intermediate re-renders</div>
<div class="cell con">Uncontrolled input diverges from Acme form patterns</div>
</div>
<div class="row">
<div class="cell pro">Well-tested edge cases (unmount, flush, cancel)</div>
<div class="cell con">~1.4 kb gzipped for something we could own</div>
</div>
</div>
<div class="chips">
<span class="chip">Bundle impact: <strong>+1.4 kb</strong></span>
<span class="chip">Testability: <strong>high</strong></span>
<span class="chip">Reuse: <strong>high</strong></span>
<span class="chip">SSR safe: <strong>yes</strong></span>
</div>
</article>
</section>
<!-- ============================================================= -->
<aside class="reco">
<h2>Recommendation</h2>
<p>
Go with <strong>approach 02, the custom <code>useDebounce</code> hook</strong>.
Acme already has three places that hand-roll the inline pattern
(task filter, command palette, member picker), so extracting one
shared hook removes duplication without taking on a new dependency.
</p>
<p>
Revisit approach 03 only if we later need <code>maxWait</code> or
<code>flush()</code> semantics — the library earns its bundle cost
once the requirements outgrow a ten-line hook.
</p>
</aside>
</div>
</body>
</html>
<!-- Copyright 2026 Anthropic PBC · SPDX-License-Identifier: Apache-2.0 -->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Empty state — four visual directions</title>
<style>
:root {
--ivory: #FAF9F5;
--slate: #141413;
--clay: #D97757;
--oat: #E3DACC;
--olive: #788C5D;
--gray-150: #F0EEE6;
--gray-300: #D1CFC5;
--gray-500: #87867F;
--gray-700: #3D3D3A;
--white: #FFFFFF;
--serif: ui-serif, Georgia, 'Times New Roman', serif;
--sans: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
--mono: ui-monospace, 'SF Mono', Menlo, Monaco, monospace;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
font-family: var(--sans);
background: var(--ivory);
color: var(--gray-700);
line-height: 1.55;
-webkit-font-smoothing: antialiased;
padding-bottom: 96px;
}
/* ---------- sticky toolbar ---------- */
.toolbar {
position: sticky;
top: 0;
z-index: 10;
background: var(--ivory);
border-bottom: 1.5px solid var(--gray-300);
padding: 14px 32px;
display: flex;
align-items: center;
gap: 18px;
font-size: 13px;
}
.toolbar .title {
font-family: var(--mono);
font-size: 12px;
letter-spacing: 0.04em;
color: var(--gray-500);
margin-right: auto;
}
.toolbar .field {
display: flex;
align-items: center;
gap: 10px;
}
.toolbar .field > span {
color: var(--gray-700);
font-weight: 500;
}
.seg {
display: inline-flex;
border: 1.5px solid var(--gray-300);
border-radius: 8px;
overflow: hidden;
background: var(--white);
}
.seg label {
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.seg label + label {
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color: var(--slate);
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}
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margin: 0 auto;
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color: var(--slate);
margin-bottom: 18px;
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}
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background: var(--gray-150);
border: 1.5px solid var(--gray-300);
border-radius: 12px;
padding: 16px 20px;
font-size: 14.5px;
}
.prompt-box .label {
font-family: var(--mono);
font-size: 11px;
text-transform: uppercase;
letter-spacing: 0.06em;
color: var(--gray-500);
display: block;
margin-bottom: 6px;
}
/* ---------- artboard grid ---------- */
.board {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 32px;
}
@media (max-width: 960px) {
.board { grid-template-columns: 1fr; }
}
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background: var(--white);
border: 1.5px solid var(--gray-300);
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position: absolute;
top: 14px;
left: 14px;
font-family: var(--mono);
font-size: 11px;
letter-spacing: 0.02em;
background: var(--oat);
color: var(--slate);
padding: 4px 10px;
border-radius: 8px;
z-index: 2;
}
.stage {
height: 280px;
border-radius: 8px;
border: 1.5px solid var(--gray-300);
background: var(--ivory);
display: flex;
align-items: center;
justify-content: center;
padding: 24px;
transition: background 0.15s, border-color 0.15s;
overflow: hidden;
}
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background: var(--slate);
border-color: var(--slate);
}
.rationale {
margin-top: 16px;
font-size: 13px;
color: var(--gray-500);
line-height: 1.5;
}
/* =========================================================
Empty-state variants — each scoped under .es-*
Theme tokens flip when .stage.dark is present.
========================================================= */
.stage { --fg: var(--slate); --muted: var(--gray-500); --line: var(--gray-300); --panel: var(--white); }
.stage.dark { --fg: #F0EEE6; --muted: #9C9A93; --line: #3D3D3A; --panel: #1F1E1B; }
/* ---- A · Minimal ---- */
.es-a {
text-align: center;
max-width: 300px;
}
.es-a h3 {
font-family: var(--serif);
font-weight: 500;
font-size: 19px;
color: var(--fg);
margin-bottom: 6px;
}
.es-a p {
font-size: 13px;
color: var(--muted);
margin-bottom: 18px;
}
.es-a .btn {
display: inline-block;
font-size: 13px;
color: var(--fg);
border: 1.5px solid var(--line);
border-radius: 8px;
padding: 8px 16px;
background: transparent;
}
/* ---- B · Illustrated ---- */
.es-b {
text-align: center;
max-width: 320px;
}
.es-b svg {
display: block;
margin: 0 auto 18px;
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.es-b h3 {
font-family: var(--serif);
font-weight: 500;
font-size: 19px;
color: var(--fg);
margin-bottom: 6px;
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.es-b p {
font-size: 13px;
color: var(--muted);
margin-bottom: 16px;
}
.es-b .btn {
display: inline-block;
font-size: 13px;
font-weight: 500;
color: var(--white);
background: var(--clay);
border-radius: 8px;
padding: 8px 16px;
}
.stage.dark .es-b .btn { color: var(--slate); background: var(--oat); }
/* ---- C · Playful ---- */
.es-c {
text-align: center;
max-width: 300px;
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.es-c .float {
width: 56px;
height: 56px;
margin: 0 auto 20px;
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border: 1.5px solid var(--line);
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.es-c .float .card:nth-child(2) { transform: rotate( 6deg) translate( 6px, 2px); opacity: 0.75; }
.es-c .float .card:nth-child(3) { background: var(--oat); border-color: var(--oat); }
.stage.dark .es-c .float .card:nth-child(3) { background: var(--clay); border-color: var(--clay); }
.es-c .shadow {
width: 44px;
height: 8px;
margin: -8px auto 22px;
border-radius: 50%;
background: rgba(0,0,0,0.12);
filter: blur(2px);
animation: shadow 3.2s ease-in-out infinite;
}
.stage.dark .es-c .shadow { background: rgba(0,0,0,0.5); }
.es-c h3 {
font-family: var(--serif);
font-weight: 500;
font-size: 19px;
color: var(--fg);
margin-bottom: 6px;
}
.es-c p {
font-size: 13px;
color: var(--muted);
}
@keyframes bob {
0%, 100% { transform: translateY(0); }
50% { transform: translateY(-10px); }
}
@keyframes shadow {
0%, 100% { transform: scaleX(1); opacity: 0.9; }
50% { transform: scaleX(0.8); opacity: 0.5; }
}
/* ---- D · Instructional ---- */
.es-d {
width: 100%;
max-width: 360px;
}
.es-d h3 {
font-family: var(--serif);
font-weight: 500;
font-size: 18px;
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margin-bottom: 14px;
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list-style: none;
counter-reset: step;
display: flex;
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gap: 10px;
}
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align-items: flex-start;
gap: 12px;
background: var(--panel);
border: 1.5px solid var(--line);
border-radius: 8px;
padding: 10px 14px;
font-size: 13px;
color: var(--fg);
}
.es-d li::before {
content: counter(step);
font-family: var(--mono);
font-size: 11px;
flex: 0 0 20px;
height: 20px;
border-radius: 50%;
background: var(--oat);
color: var(--slate);
display: inline-flex;
align-items: center;
justify-content: center;
margin-top: 1px;
}
.es-d li span { color: var(--muted); display: block; font-size: 12px; margin-top: 2px; }
</style>
</head>
<body>
<div class="toolbar">
<div class="title">Acme · design exploration</div>
<div class="field">
<span>Background:</span>
<div class="seg" id="bg-seg">
<label><input type="radio" name="bg" value="light" checked><span>Light</span></label>
<label><input type="radio" name="bg" value="dark"><span>Dark</span></label>
</div>
</div>
</div>
<div class="page">
<header class="page-head">
<div class="eyebrow">Exploration · Empty states</div>
<h1>Four visual directions for the “no tasks yet” state</h1>
<div class="prompt-box">
<span class="label">Prompt</span>
Explore four visual directions for our empty-state component. Render each
live so we can compare tone, density, and how well they hold up on light
and dark surfaces.
</div>
</header>
<section class="board">
<!-- ================= A — Minimal ================= -->
<article class="artboard">
<span class="tag">A — Minimal</span>
<div class="stage">
<div class="es-a">
<h3>No tasks yet</h3>
<p>When you create a task it will show up here.</p>
<span class="btn">New task</span>
</div>
</div>
<p class="rationale">
Pure typography, single quiet action. Reads as calm and confident;
assumes the surrounding UI already carries enough personality.
</p>
</article>
<!-- ================= B — Illustrated ================= -->
<article class="artboard">
<span class="tag">B — Illustrated</span>
<div class="stage">
<div class="es-b">
<svg width="120" height="90" viewBox="0 0 120 90" aria-hidden="true">
<rect x="14" y="20" width="72" height="54" rx="8"
fill="var(--panel)" stroke="var(--line)" stroke-width="1.5"/>
<rect x="34" y="10" width="72" height="54" rx="8"
fill="var(--oat)"/>
<line x1="46" y1="26" x2="92" y2="26"
stroke="var(--slate)" stroke-width="2" stroke-linecap="round"/>
<line x1="46" y1="38" x2="80" y2="38"
stroke="var(--slate)" stroke-width="2" stroke-linecap="round" opacity="0.5"/>
<circle cx="98" cy="60" r="12" fill="var(--clay)"/>
<path d="M98 55 v10 M93 60 h10"
stroke="white" stroke-width="2" stroke-linecap="round"/>
</svg>
<h3>Start your first list</h3>
<p>Group related work and watch progress roll up automatically.</p>
<span class="btn">Create a task</span>
</div>
</div>
<p class="rationale">
A small geometric spot illustration anchors the eye and explains the
object model (lists contain tasks) without a wall of copy.
</p>
</article>
<!-- ================= C — Playful ================= -->
<article class="artboard">
<span class="tag">C — Playful</span>
<div class="stage">
<div class="es-c">
<div class="float">
<div class="card"></div>
<div class="card"></div>
<div class="card"></div>
</div>
<div class="shadow"></div>
<h3>Nothing on your plate</h3>
<p>Enjoy the quiet, or add something to get moving.</p>
</div>
</div>
<p class="rationale">
A gently bobbing stack adds life to an otherwise static screen. Motion
is subtle enough to loop indefinitely without drawing complaints.
</p>
</article>
<!-- ================= D — Instructional ================= -->
<article class="artboard">
<span class="tag">D — Instructional</span>
<div class="stage">
<div class="es-d">
<h3>Set up this project</h3>
<ol>
<li>
Create your first task
<span>Give it a name and an owner.</span>
</li>
<li>
Add a due date
<span>Acme will surface it on the timeline.</span>
</li>
<li>
Invite a teammate
<span>Shared projects stay in sync automatically.</span>
</li>
</ol>
</div>
</div>
<p class="rationale">
Treats the empty state as onboarding. Higher density, but every line is
actionable — best when the user is new to the product, not just the view.
</p>
</article>
</section>
</div>
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</html>
<!-- Copyright 2026 Anthropic PBC · SPDX-License-Identifier: Apache-2.0 -->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>PR #247 — Review Summary</title>
<style>
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background: var(--gray-150);
border: 1.5px solid var(--gray-300);
border-radius: 8px;
padding: 6px 10px;
}
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.stat {
font-family: var(--mono);
font-size: 13px;
}
.stat .add { color: var(--olive); font-weight: 600; }
.stat .del { color: var(--rust); font-weight: 600; }
.stat .files { color: var(--gray-500); margin-left: 10px; }
/* ---------- Section blocks ---------- */
section { margin-bottom: 40px; }
h2 {
font-family: var(--serif);
font-weight: 500;
font-size: 21px;
color: var(--slate);
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left: 4px;
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height: 6px;
background: var(--gray-500);
border-radius: 2px;
}
/* ---------- Risk map ---------- */
.risk-map {
display: flex;
flex-wrap: wrap;
gap: 10px;
}
.chip {
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align-items: center;
gap: 8px;
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font-size: 12.5px;
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}
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flex-shrink: 0;
}
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.chip.medium .dot { background: #B89B6E; }
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.legend {
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font-size: 12px;
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/* ---------- File sections ---------- */
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border: 1.5px solid var(--gray-300);
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background: #fff;
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border-bottom: 1.5px solid var(--gray-150);
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.risk-tag {
font-size: 11px;
text-transform: uppercase;
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/* ---------- Diff block ---------- */
.diff {
background: var(--slate);
font-family: var(--mono);
font-size: 12.5px;
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white-space: pre;
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}
.diff-row.hunk .code { color: var(--gray-500); }
/* ---------- Review comments ---------- */
.comments {
padding: 18px 20px 20px;
display: flex;
flex-direction: column;
gap: 14px;
background: var(--gray-150);
}
.bubble {
position: relative;
background: #fff;
border: 1.5px solid var(--gray-300);
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details.file-collapsed {
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border-radius: 12px;
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margin-bottom: 14px;
scroll-margin-top: 20px;
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</head>
<body>
<div class="page">
<header class="pr-head">
<div class="repo-line">acme/web · Pull Request #247</div>
<h1>Add optimistic updates to task list mutations</h1>
<div class="meta-row">
<div class="author">
<div class="avatar">MO</div>
<div>
<div class="author-name">Mira Okafor</div>
<div class="author-sub">opened 2 days ago</div>
</div>
</div>
<div class="branch">
mo/optimistic-tasks <span class="arrow">→</span> main
</div>
<div class="stat">
<span class="add">+142</span> / <span class="del">−38</span>
<span class="files">6 files changed</span>
</div>
</div>
</header>
<section class="prose">
<h2>What this PR does</h2>
<ul>
<li>Replaces the await-then-refetch pattern in <code style="font-family:var(--mono);font-size:12.5px;background:var(--gray-150);padding:1px 5px;border-radius:4px">TaskList</code> with optimistic cache writes, so toggling or reordering a task feels instant instead of waiting ~300ms for the round-trip.</li>
<li>Introduces a small <code style="font-family:var(--mono);font-size:12.5px;background:var(--gray-150);padding:1px 5px;border-radius:4px">useOptimisticTasks</code> hook that wraps the mutation, snapshots the previous list, and rolls back on error.</li>
<li>Extends the API client to accept an idempotency key per mutation and adds a toast when a rollback fires.</li>
</ul>
</section>
<section>
<h2>Risk map</h2>
<div class="risk-map">
<a class="chip attention" href="#file-hook"><span class="dot"></span>useOptimisticTasks.ts</a>
<a class="chip medium" href="#file-tasklist"><span class="dot"></span>TaskList.tsx</a>
<a class="chip medium" href="#file-api"><span class="dot"></span>api/tasks.ts</a>
<a class="chip safe" href="#file-toast"><span class="dot"></span>Toast.tsx</a>
<a class="chip safe" href="#file-types"><span class="dot"></span>types/task.ts</a>
<a class="chip safe" href="#file-test"><span class="dot"></span>TaskList.test.tsx</a>
</div>
<div class="legend">
<span><span class="dot" style="background:var(--olive)"></span> safe</span>
<span><span class="dot" style="background:#B89B6E"></span> worth a look</span>
<span><span class="dot" style="background:var(--clay)"></span> needs attention</span>
</div>
</section>
<section>
<h2>Files</h2>
<!-- File 1: hook (attention) -->
<article class="file-card" id="file-hook">
<div class="file-head">
<div>
<div class="file-path">src/hooks/useOptimisticTasks.ts</div>
</div>
<div style="display:flex;align-items:center;gap:12px">
<span class="risk-tag attention">needs attention</span>
<span class="file-delta"><span class="add">+58</span> <span class="del">−0</span></span>
</div>
</div>
<div class="diff">
<div class="diff-row hunk"><span class="ln"></span><span class="mark"></span><span class="code">@@ -0,0 +1,58 @@</span></div>
<div class="diff-row add"><span class="ln">1</span><span class="mark">+</span><span class="code">import { useMutation, useQueryClient } from '@tanstack/react-query';</span></div>
<div class="diff-row add"><span class="ln">2</span><span class="mark">+</span><span class="code">import { updateTask, TaskPatch } from '../api/tasks';</span></div>
<div class="diff-row add"><span class="ln">3</span><span class="mark">+</span><span class="code">import type { Task } from '../types/task';</span></div>
<div class="diff-row add"><span class="ln">4</span><span class="mark">+</span><span class="code"> </span></div>
<div class="diff-row add"><span class="ln">5</span><span class="mark">+</span><span class="code">export function useOptimisticTasks(boardId: string) {</span></div>
<div class="diff-row add"><span class="ln">6</span><span class="mark">+</span><span class="code"> const qc = useQueryClient();</span></div>
<div class="diff-row add"><span class="ln">7</span><span class="mark">+</span><span class="code"> const key = ['tasks', boardId];</span></div>
<div class="diff-row add"><span class="ln">8</span><span class="mark">+</span><span class="code"> </span></div>
<div class="diff-row add"><span class="ln">9</span><span class="mark">+</span><span class="code"> return useMutation({</span></div>
<div class="diff-row add"><span class="ln">10</span><span class="mark">+</span><span class="code"> mutationFn: (patch: TaskPatch) => updateTask(patch),</span></div>
<div class="diff-row add"><span class="ln">11</span><span class="mark">+</span><span class="code"> onMutate: async (patch) => {</span></div>
<div class="diff-row add"><span class="ln">12</span><span class="mark">+</span><span class="code"> const prev = qc.getQueryData<Task[]>(key);</span></div>
<div class="diff-row add"><span class="ln">13</span><span class="mark">+</span><span class="code"> qc.setQueryData<Task[]>(key, (old = []) =></span></div>
<div class="diff-row add"><span class="ln">14</span><span class="mark">+</span><span class="code"> old.map(t => t.id === patch.id ? { ...t, ...patch } : t)</span></div>
<div class="diff-row add"><span class="ln">15</span><span class="mark">+</span><span class="code"> );</span></div>
<div class="diff-row add"><span class="ln">16</span><span class="mark">+</span><span class="code"> return { prev };</span></div>
<div class="diff-row add"><span class="ln">17</span><span class="mark">+</span><span class="code"> },</span></div>
<div class="diff-row add"><span class="ln">18</span><span class="mark">+</span><span class="code"> onError: (_e, _p, ctx) => qc.setQueryData(key, ctx?.prev),</span></div>
<div class="diff-row add"><span class="ln">19</span><span class="mark">+</span><span class="code"> });</span></div>
<div class="diff-row add"><span class="ln">20</span><span class="mark">+</span><span class="code">}</span></div>
</div>
<div class="comments">
<div class="bubble blocking">
<div class="anchor">line 11</div>
<p><span class="label">Blocking</span><code>onMutate</code> doesn't call <code>qc.cancelQueries(key)</code> first. If a background refetch lands between the optimistic write and the server response, it will clobber the optimistic state and the UI will flicker back to the old value.</p>
</div>
<div class="bubble nit">
<div class="anchor">line 18</div>
<p><span class="label">Nit</span>Rollback restores the list but never surfaces the error. Consider wiring the existing <code>pushToast</code> here so users know the toggle didn't stick.</p>
</div>
</div>
</article>
<!-- File 2: TaskList (medium) -->
<article class="file-card" id="file-tasklist">
<div class="file-head">
<div>
<div class="file-path">src/components/TaskList.tsx</div>
</div>
<div style="display:flex;align-items:center;gap:12px">
<span class="risk-tag medium">worth a look</span>
<span class="file-delta"><span class="add">+31</span> <span class="del">−24</span></span>
</div>
</div>
<div class="diff">
<div class="diff-row hunk"><span class="ln"></span><span class="mark"></span><span class="code">@@ -42,14 +42,17 @@ export function TaskList({ boardId }: Props) {</span></div>
<div class="diff-row ctx"><span class="ln">42</span><span class="mark"> </span><span class="code"> const { data: tasks } = useTasks(boardId);</span></div>
<div class="diff-row del"><span class="ln">43</span><span class="mark">-</span><span class="code"> const [pending, setPending] = useState<string | null>(null);</span></div>
<div class="diff-row del"><span class="ln">44</span><span class="mark">-</span><span class="code"> </span></div>
<div class="diff-row del"><span class="ln">45</span><span class="mark">-</span><span class="code"> async function toggle(task: Task) {</span></div>
<div class="diff-row del"><span class="ln">46</span><span class="mark">-</span><span class="code"> setPending(task.id);</span></div>
<div class="diff-row del"><span class="ln">47</span><span class="mark">-</span><span class="code"> await updateTask({ id: task.id, done: !task.done });</span></div>
<div class="diff-row del"><span class="ln">48</span><span class="mark">-</span><span class="code"> await refetch();</span></div>
<div class="diff-row del"><span class="ln">49</span><span class="mark">-</span><span class="code"> setPending(null);</span></div>
<div class="diff-row del"><span class="ln">50</span><span class="mark">-</span><span class="code"> }</span></div>
<div class="diff-row add"><span class="ln">43</span><span class="mark">+</span><span class="code"> const { mutate, isPending } = useOptimisticTasks(boardId);</span></div>
<div class="diff-row add"><span class="ln">44</span><span class="mark">+</span><span class="code"> </span></div>
<div class="diff-row add"><span class="ln">45</span><span class="mark">+</span><span class="code"> const toggle = (task: Task) =></span></div>
<div class="diff-row add"><span class="ln">46</span><span class="mark">+</span><span class="code"> mutate({ id: task.id, done: !task.done });</span></div>
<div class="diff-row ctx"><span class="ln">47</span><span class="mark"> </span><span class="code"> </span></div>
<div class="diff-row ctx"><span class="ln">48</span><span class="mark"> </span><span class="code"> return (</span></div>
<div class="diff-row ctx"><span class="ln">49</span><span class="mark"> </span><span class="code"> <ul className="tasks"></span></div>
<div class="diff-row del"><span class="ln">50</span><span class="mark">-</span><span class="code"> {tasks?.map(t => <TaskRow key={t.id} task={t} busy={pending === t.id} />)}</span></div>
<div class="diff-row add"><span class="ln">50</span><span class="mark">+</span><span class="code"> {tasks?.map(t => <TaskRow key={t.id} task={t} onToggle={toggle} />)}</span></div>
<div class="diff-row ctx"><span class="ln">51</span><span class="mark"> </span><span class="code"> </ul></span></div>
</div>
<div class="comments">
<div class="bubble nit">
<div class="anchor">line 43</div>
<p><span class="label">Nit</span><code>isPending</code> is destructured but never read. Either drop it or pass it to <code>TaskRow</code> so the checkbox can dim while the request is in flight.</p>
</div>
</div>
</article>
<!-- File 3: api/tasks (medium) -->
<article class="file-card" id="file-api">
<div class="file-head">
<div>
<div class="file-path">src/api/tasks.ts</div>
</div>
<div style="display:flex;align-items:center;gap:12px">
<span class="risk-tag medium">worth a look</span>
<span class="file-delta"><span class="add">+19</span> <span class="del">−6</span></span>
</div>
</div>
<div class="diff">
<div class="diff-row hunk"><span class="ln"></span><span class="mark"></span><span class="code">@@ -12,10 +12,15 @@ export type TaskPatch = Partial<Task> & { id: string };</span></div>
<div class="diff-row ctx"><span class="ln">12</span><span class="mark"> </span><span class="code"> </span></div>
<div class="diff-row del"><span class="ln">13</span><span class="mark">-</span><span class="code">export async function updateTask(patch: TaskPatch) {</span></div>
<div class="diff-row del"><span class="ln">14</span><span class="mark">-</span><span class="code"> return http.patch(`/tasks/${patch.id}`, patch);</span></div>
<div class="diff-row add"><span class="ln">13</span><span class="mark">+</span><span class="code">export async function updateTask(</span></div>
<div class="diff-row add"><span class="ln">14</span><span class="mark">+</span><span class="code"> patch: TaskPatch,</span></div>
<div class="diff-row add"><span class="ln">15</span><span class="mark">+</span><span class="code"> key = crypto.randomUUID(),</span></div>
<div class="diff-row add"><span class="ln">16</span><span class="mark">+</span><span class="code">) {</span></div>
<div class="diff-row add"><span class="ln">17</span><span class="mark">+</span><span class="code"> return http.patch(`/tasks/${patch.id}`, patch, {</span></div>
<div class="diff-row add"><span class="ln">18</span><span class="mark">+</span><span class="code"> headers: { 'Idempotency-Key': key },</span></div>
<div class="diff-row add"><span class="ln">19</span><span class="mark">+</span><span class="code"> });</span></div>
<div class="diff-row ctx"><span class="ln">20</span><span class="mark"> </span><span class="code">}</span></div>
</div>
<div class="comments">
<div class="bubble blocking">
<div class="anchor">line 15</div>
<p><span class="label">Blocking</span>Generating the idempotency key as a default parameter means retries from the mutation layer get a <em>new</em> key each time, which defeats the purpose. The key should be minted once in <code>onMutate</code> and threaded through.</p>
</div>
</div>
</article>
<!-- Collapsed files -->
<details class="file-collapsed" id="file-toast">
<summary>
<span class="file-path">src/components/Toast.tsx</span>
<span style="display:flex;align-items:center;gap:12px">
<span class="risk-tag safe">safe</span>
<span class="file-delta"><span class="add">+14</span> <span class="del">−2</span></span>
</span>
</summary>
<div class="body">Adds a <code style="font-family:var(--mono)">variant="warning"</code> style and exports <code style="font-family:var(--mono)">pushToast</code>. Purely additive, no behaviour change for existing call sites.</div>
</details>
<details class="file-collapsed" id="file-types">
<summary>
<span class="file-path">src/types/task.ts</span>
<span style="display:flex;align-items:center;gap:12px">
<span class="risk-tag safe">safe</span>
<span class="file-delta"><span class="add">+6</span> <span class="del">−2</span></span>
</span>
</summary>
<div class="body">Widens <code style="font-family:var(--mono)">Task.status</code> to include <code style="font-family:var(--mono)">"archived"</code> and adds an optional <code style="font-family:var(--mono)">updatedAt</code> timestamp. Type-only change.</div>
</details>
<details class="file-collapsed" id="file-test">
<summary>
<span class="file-path">src/components/__tests__/TaskList.test.tsx</span>
<span style="display:flex;align-items:center;gap:12px">
<span class="risk-tag safe">safe</span>
<span class="file-delta"><span class="add">+14</span> <span class="del">−4</span></span>
</span>
</summary>
<div class="body">Adds a test asserting the row updates synchronously after click, and one asserting rollback when the mocked request rejects. Both pass locally.</div>
</details>
</section>
<footer class="next-steps">
<h2>Suggested next steps</h2>
<ul class="checklist">
<li>
<input type="checkbox" id="step1">
<label for="step1">Add <code>await qc.cancelQueries(key)</code> at the top of <code>onMutate</code> in <code>useOptimisticTasks.ts</code>.</label>
</li>
<li>
<input type="checkbox" id="step2">
<label for="step2">Move idempotency-key generation into the mutation context so retries reuse the same key.</label>
</li>
<li>
<input type="checkbox" id="step3">
<label for="step3">Either consume <code>isPending</code> in <code>TaskRow</code> or remove it from the destructure to keep lint clean.</label>
</li>
</ul>
</footer>
</div>
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</html>
<!-- Copyright 2026 Anthropic PBC · SPDX-License-Identifier: Apache-2.0 -->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>How authentication flows through acme/web</title>
<style>
:root {
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gap: 40px;
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header {
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</head>
<body>
<div class="page">
<header>
<div class="repo-line">acme/web · architecture note</div>
<h1>How authentication flows through the codebase</h1>
<p class="summary">
Acme uses cookie-based sessions: the browser never holds a bearer token directly. Every authenticated request hits <code>/api/*</code>, passes through a single <code>verifyToken()</code> middleware, and resolves to a <code>Session</code> row that downstream handlers read off <code>req.ctx</code>. The middleware is the only place that talks to the session store, which is the only place that talks to the <code>sessions</code> table — so there's exactly one trust boundary to reason about.
</p>
</header>
<main>
<h2 style="margin-top:0">Request path</h2>
<div class="diagram-panel">
<svg class="flow" viewBox="0 0 720 280" width="720" height="280" role="img" aria-label="Authentication flow diagram">
<defs>
<marker id="arrowHead" viewBox="0 0 10 10" refX="9" refY="5" markerWidth="7" markerHeight="7" orient="auto-start-reverse">
<path d="M 0 0 L 10 5 L 0 10 z" fill="#87867F"></path>
</marker>
</defs>
<!-- Row 1 -->
<g>
<rect class="box" x="30" y="40" width="150" height="64" rx="10"></rect>
<text x="105" y="68" text-anchor="middle">Browser</text>
<text class="sub" x="105" y="84" text-anchor="middle">acme.app</text>
</g>
<g>
<rect class="box" x="245" y="40" width="150" height="64" rx="10"></rect>
<text x="320" y="68" text-anchor="middle">/api/session</text>
<text class="sub" x="320" y="84" text-anchor="middle">route handler</text>
</g>
<g>
<rect class="box hot" x="460" y="40" width="180" height="64" rx="10"></rect>
<text x="550" y="68" text-anchor="middle">verifyToken()</text>
<text class="sub" x="550" y="84" text-anchor="middle">middleware/auth.ts</text>
</g>
<!-- Row 2 -->
<g>
<rect class="box" x="460" y="170" width="180" height="64" rx="10"></rect>
<text x="550" y="198" text-anchor="middle">SessionStore</text>
<text class="sub" x="550" y="214" text-anchor="middle">lib/sessionStore.ts</text>
</g>
<g>
<rect class="box" x="245" y="170" width="150" height="64" rx="10"></rect>
<text x="320" y="198" text-anchor="middle">Postgres</text>
<text class="sub" x="320" y="214" text-anchor="middle">sessions table</text>
</g>
<!-- Arrows -->
<line class="arrow" x1="180" y1="72" x2="245" y2="72" marker-end="url(#arrowHead)"></line>
<line class="arrow" x1="395" y1="72" x2="460" y2="72" marker-end="url(#arrowHead)"></line>
<line class="arrow" x1="550" y1="104" x2="550" y2="170" marker-end="url(#arrowHead)"></line>
<line class="arrow" x1="460" y1="202" x2="395" y2="202" marker-end="url(#arrowHead)"></line>
<text class="sub" x="212" y="62" text-anchor="middle">cookie</text>
<text class="sub" x="560" y="140" text-anchor="start">lookup</text>
</svg>
</div>
<h2>Callstack walkthrough</h2>
<!-- Step 1 -->
<div class="step">
<div class="badge">1</div>
<div class="step-body">
<div class="step-loc">src/app/providers/AuthProvider.tsx<span class="range"> :22-48</span></div>
<p>On mount, the React provider issues a <code style="font-family:var(--mono);font-size:12.5px">GET /api/session</code> with <code style="font-family:var(--mono);font-size:12.5px">credentials: 'include'</code> so the <code style="font-family:var(--mono);font-size:12.5px">fw_sid</code> cookie rides along. The response either hydrates <code style="font-family:var(--mono);font-size:12.5px">currentUser</code> into context or leaves it <code style="font-family:var(--mono);font-size:12.5px">null</code>, which the router treats as "show the sign-in screen".</p>
<details class="snippet">
<summary>show source</summary>
<pre class="code"><span class="dim">// src/app/providers/AuthProvider.tsx</span>
<span class="kw">export function</span> AuthProvider({ children }: Props) {
<span class="kw">const</span> [user, setUser] = useState<User | <span class="kw">null</span>>(<span class="kw">null</span>);
useEffect(() => {
fetch(<span class="str">'/api/session'</span>, { credentials: <span class="str">'include'</span> })
.then(r => r.ok ? r.json() : <span class="kw">null</span>)
.then(setUser);
}, []);
<span class="kw">return</span> <AuthCtx.Provider value={{ user }}>{children}</AuthCtx.Provider>;
}</pre>
</details>
</div>
</div>
<!-- Step 2 -->
<div class="step">
<div class="badge">2</div>
<div class="step-body">
<div class="step-loc">src/server/routes/session.ts<span class="range"> :9-27</span></div>
<p>The route itself is thin: it just returns whatever <code style="font-family:var(--mono);font-size:12.5px">req.ctx.session</code> the middleware attached. If the middleware short-circuited with a 401, this handler never runs — so there's no auth logic duplicated here.</p>
<details class="snippet">
<summary>show source</summary>
<pre class="code"><span class="dim">// src/server/routes/session.ts</span>
router.get(<span class="str">'/session'</span>, verifyToken, (req, res) => {
<span class="kw">const</span> { session } = req.ctx;
res.json({
id: session.userId,
email: session.email,
role: session.role,
exp: session.expiresAt,
});
});</pre>
</details>
</div>
</div>
<!-- Step 3 -->
<div class="step hot">
<div class="badge">3</div>
<div class="step-body">
<div class="step-loc">src/middleware/auth.ts<span class="range"> :14-31</span></div>
<p>This is the trust boundary. <code style="font-family:var(--mono);font-size:12.5px">verifyToken</code> reads the signed <code style="font-family:var(--mono);font-size:12.5px">fw_sid</code> cookie, asks <code style="font-family:var(--mono);font-size:12.5px">SessionStore</code> to resolve it, and either populates <code style="font-family:var(--mono);font-size:12.5px">req.ctx.session</code> or responds 401. Every protected route in the app is mounted behind this function, so changing its behaviour changes auth globally.</p>
<details class="snippet" open>
<summary>show source</summary>
<pre class="code"><span class="dim">// src/middleware/auth.ts</span>
<span class="kw">export async function</span> verifyToken(req, res, next) {
<span class="kw">const</span> raw = req.signedCookies[<span class="str">'fw_sid'</span>];
<span class="kw">if</span> (!raw) <span class="kw">return</span> res.status(401).end();
<span class="kw">const</span> session = <span class="kw">await</span> SessionStore.get(raw);
<span class="kw">if</span> (!session || session.expiresAt < Date.now()) {
<span class="kw">return</span> res.status(401).end();
}
req.ctx = { session };
next();
}</pre>
</details>
</div>
</div>
<!-- Step 4 -->
<div class="step">
<div class="badge">4</div>
<div class="step-body">
<div class="step-loc">src/lib/sessionStore.ts<span class="range"> :8-52</span></div>
<p><code style="font-family:var(--mono);font-size:12.5px">SessionStore</code> is a small read-through cache: it checks an in-process LRU first, then falls back to Postgres. Writes (<code style="font-family:var(--mono);font-size:12.5px">create</code>, <code style="font-family:var(--mono);font-size:12.5px">revoke</code>) always go straight to the DB and invalidate the cache entry so other workers don't serve a stale session.</p>
<details class="snippet">
<summary>show source</summary>
<pre class="code"><span class="dim">// src/lib/sessionStore.ts</span>
<span class="kw">const</span> cache = <span class="kw">new</span> LRU<string, Session>({ max: 5000, ttl: 60_000 });
<span class="kw">export const</span> SessionStore = {
<span class="kw">async</span> get(id: string) {
<span class="kw">const</span> hit = cache.get(id);
<span class="kw">if</span> (hit) <span class="kw">return</span> hit;
<span class="kw">const</span> row = <span class="kw">await</span> db.one(SELECT_SESSION, [id]);
<span class="kw">if</span> (row) cache.set(id, row);
<span class="kw">return</span> row ?? <span class="kw">null</span>;
},
<span class="dim">/* create, revoke, touch ... */</span>
};</pre>
</details>
</div>
</div>
<!-- Step 5 -->
<div class="step">
<div class="badge">5</div>
<div class="step-body">
<div class="step-loc">db/migrations/004_sessions.sql<span class="range"> :1-18</span></div>
<p>The <code style="font-family:var(--mono);font-size:12.5px">sessions</code> table is keyed on a random 32-byte id (the cookie value) with a covering index on <code style="font-family:var(--mono);font-size:12.5px">user_id</code> for "sign out everywhere". Expiry is enforced both here (<code style="font-family:var(--mono);font-size:12.5px">expires_at</code>) and again in the middleware as defence in depth.</p>
<details class="snippet">
<summary>show source</summary>
<pre class="code"><span class="dim">-- db/migrations/004_sessions.sql</span>
<span class="kw">create table</span> sessions (
id <span class="kw">text primary key</span>,
user_id <span class="kw">uuid not null references</span> users(id),
created_at <span class="kw">timestamptz default</span> now(),
expires_at <span class="kw">timestamptz not null</span>,
ip <span class="kw">inet</span>,
user_agent <span class="kw">text</span>
);
<span class="kw">create index</span> sessions_user_id_idx <span class="kw">on</span> sessions(user_id);</pre>
</details>
</div>
</div>
</main>
<aside>
<div class="panel">
<h3>Key files</h3>
<ul class="key-files">
<li>
<span class="path">src/middleware/auth.ts</span>
<span class="desc">Single entry point for request authentication.</span>
</li>
<li>
<span class="path">src/lib/sessionStore.ts</span>
<span class="desc">LRU + Postgres session lookup; only DB caller.</span>
</li>
<li>
<span class="path">src/server/routes/session.ts</span>
<span class="desc">Returns the current session to the client.</span>
</li>
<li>
<span class="path">src/server/routes/login.ts</span>
<span class="desc">Exchanges credentials for a cookie via SessionStore.create.</span>
</li>
<li>
<span class="path">src/app/providers/AuthProvider.tsx</span>
<span class="desc">Client-side context that mirrors the server session.</span>
</li>
<li>
<span class="path">db/migrations/004_sessions.sql</span>
<span class="desc">Schema for the sessions table and indexes.</span>
</li>
</ul>
</div>
<div class="gotchas">
<h3>Gotchas</h3>
<ul>
<li>The LRU in <code>SessionStore</code> is per-process. Revoking a session only clears the local cache — other workers may serve it for up to 60s until their TTL lapses.</li>
<li><code>verifyToken</code> compares <code>expiresAt</code> against <code>Date.now()</code>, but the column is <code>timestamptz</code>. The driver returns a <code>Date</code>, so the comparison works, but don't refactor it to a raw string without adjusting the check.</li>
</ul>
</div>
</aside>
</div>
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</body>
</html>
<!-- Copyright 2026 Anthropic PBC · SPDX-License-Identifier: Apache-2.0 -->
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Acme — Design System Reference</title>
<style>
:root {
--ivory: #FAF9F5;
--slate: #141413;
--clay: #D97757;
--oat: #E3DACC;
--olive: #788C5D;
--gray-100: #F0EEE6;
--gray-300: #D1CFC5;
--gray-500: #87867F;
--gray-700: #3D3D3A;
--white: #FFFFFF;
--serif: ui-serif, Georgia, serif;
--sans: system-ui, -apple-system, sans-serif;
--mono: ui-monospace, 'SF Mono', Menlo, monospace;
--radius-panel: 12px;
--radius-row: 8px;
--border: 1.5px solid var(--gray-300);
}
* { box-sizing: border-box; }
body {
margin: 0;
padding: 56px 24px 96px;
background: var(--ivory);
color: var(--slate);
font-family: var(--sans);
font-size: 15px;
line-height: 1.55;
-webkit-font-smoothing: antialiased;
}
.page {
max-width: 980px;
margin: 0 auto;
}
header h1 {
font-family: var(--serif);
font-weight: 500;
font-size: 40px;
letter-spacing: -0.01em;
margin: 0 0 6px;
}
header .sub {
color: var(--gray-500);
font-size: 14px;
margin: 0 0 48px;
}
header .sub code {
font-family: var(--mono);
font-size: 13px;
background: var(--gray-100);
padding: 1px 5px;
border-radius: 4px;
}
section { margin-bottom: 64px; }
h2 {
font-family: var(--serif);
font-weight: 500;
font-size: 26px;
margin: 0 0 8px;
letter-spacing: -0.01em;
}
hr.rule {
border: none;
border-top: 1px solid var(--gray-300);
margin: 0 0 28px;
}
/* ---------- Color ---------- */
.swatch-group {
margin-bottom: 28px;
}
.swatch-group-label {
font-family: var(--mono);
font-size: 11px;
text-transform: uppercase;
letter-spacing: 0.08em;
color: var(--gray-500);
margin-bottom: 12px;
}
.swatch-grid {
display: grid;
grid-template-columns: repeat(auto-fill, minmax(96px, 1fr));
gap: 20px 16px;
}
.swatch {}
.swatch .chip {
width: 64px;
height: 64px;
border-radius: var(--radius-row);
border: var(--border);
margin-bottom: 8px;
}
.swatch .chip.no-border { border-color: transparent; }
.swatch .hex {
font-family: var(--mono);
font-size: 12px;
color: var(--gray-700);
display: block;
}
.swatch .token {
font-family: var(--mono);
font-size: 11px;
color: var(--gray-500);
display: block;
}
/* ---------- Typography ---------- */
.type-scale {
border: var(--border);
border-radius: var(--radius-panel);
background: var(--white);
overflow: hidden;
}
.type-row {
display: flex;
align-items: baseline;
justify-content: space-between;
gap: 24px;
padding: 20px 24px;
border-bottom: 1px solid var(--gray-100);
}
.type-row:last-child { border-bottom: none; }
.type-specimen {
flex: 1;
min-width: 0;
white-space: nowrap;
overflow: hidden;
text-overflow: ellipsis;
color: var(--slate);
}
.type-meta {
font-family: var(--mono);
font-size: 12px;
color: var(--gray-500);
text-align: right;
flex-shrink: 0;
}
.type-meta .name {
color: var(--gray-700);
display: block;
margin-bottom: 2px;
}
.t-display { font-family: var(--serif); font-size: 48px; line-height: 1.1; font-weight: 500; letter-spacing: -0.02em; }
.t-h1 { font-family: var(--serif); font-size: 32px; line-height: 1.2; font-weight: 500; letter-spacing: -0.01em; }
.t-h2 { font-family: var(--serif); font-size: 24px; line-height: 1.3; font-weight: 500; }
.t-body { font-family: var(--sans); font-size: 16px; line-height: 1.55; font-weight: 430; }
.t-small { font-family: var(--sans); font-size: 14px; line-height: 1.5; font-weight: 430; }
.t-caption { font-family: var(--sans); font-size: 12px; line-height: 1.4; font-weight: 500; color: var(--gray-500); }
/* ---------- Spacing ---------- */
.spacing-ruler {
display: flex;
align-items: flex-end;
gap: 28px;
padding: 28px 24px;
background: var(--white);
border: var(--border);
border-radius: var(--radius-panel);
overflow-x: auto;
}
.space-token {
display: flex;
flex-direction: column;
align-items: center;
gap: 10px;
flex-shrink: 0;
}
.space-bar {
background: var(--clay);
border-radius: 3px;
height: 14px;
}
.space-label {
font-family: var(--mono);
font-size: 11px;
color: var(--gray-700);
text-align: center;
}
.space-label span {
display: block;
color: var(--gray-500);
}
/* ---------- Radius & Elevation ---------- */
.token-row {
display: flex;
flex-wrap: wrap;
gap: 20px;
margin-bottom: 28px;
}
.radius-card {
width: 120px;
height: 88px;
background: var(--oat);
border: var(--border);
display: flex;
align-items: flex-end;
padding: 10px 12px;
}
.radius-card .lbl {
font-family: var(--mono);
font-size: 11px;
color: var(--gray-700);
}
.radius-card .lbl span { color: var(--gray-500); display: block; }
.shadow-card {
width: 160px;
height: 96px;
background: var(--white);
border-radius: var(--radius-panel);
display: flex;
align-items: flex-end;
padding: 12px 14px;
}
.shadow-card .lbl {
font-family: var(--mono);
font-size: 11px;
color: var(--gray-700);
}
.shadow-card .lbl span { color: var(--gray-500); display: block; }
/* ---------- Core components ---------- */
.component {
margin-bottom: 32px;
}
.component-name {
font-family: var(--mono);
font-size: 12px;
color: var(--gray-500);
margin-bottom: 12px;
}
.component-stage {
display: flex;
flex-wrap: wrap;
align-items: center;
gap: 16px;
padding: 24px;
background: var(--white);
border: var(--border);
border-radius: var(--radius-panel);
}
/* Button */
.btn {
display: inline-flex;
align-items: center;
justify-content: center;
height: 36px;
padding: 0 16px;
font-family: var(--sans);
font-size: 14px;
font-weight: 500;
border-radius: var(--radius-row);
border: 1.5px solid transparent;
cursor: pointer;
transition: background 0.12s ease, border-color 0.12s ease;
}
.btn-primary { background: var(--clay); color: var(--white); }
.btn-primary:hover { background: #C7684C; }
.btn-secondary { background: var(--white); color: var(--slate); border-color: var(--gray-300); }
.btn-secondary:hover { background: var(--gray-100); }
.btn-ghost { background: transparent; color: var(--gray-700); }
.btn-ghost:hover { background: var(--gray-100); }
.btn-danger { background: #B04A4A; color: var(--white); }
.btn-danger:hover { background: #9A3F3F; }
/* Input */
.input {
height: 38px;
padding: 0 12px;
font-family: var(--sans);
font-size: 14px;
color: var(--slate);
background: var(--white);
border: var(--border);
border-radius: var(--radius-row);
width: 260px;
outline: none;
transition: border-color 0.12s ease, box-shadow 0.12s ease;
}
.input::placeholder { color: var(--gray-500); }
.input:focus {
border-color: var(--clay);
box-shadow: 0 0 0 3px rgba(217, 119, 87, 0.15);
}
/* Checkbox */
.checkbox {
display: inline-flex;
align-items: center;
gap: 10px;
font-size: 14px;
cursor: pointer;
user-select: none;
}
.checkbox input {
appearance: none;
width: 18px;
height: 18px;
border: var(--border);
border-radius: 5px;
background: var(--white);
margin: 0;
cursor: pointer;
position: relative;
transition: background 0.12s ease, border-color 0.12s ease;
}
.checkbox input:checked {
background: var(--clay);
border-color: var(--clay);
}
.checkbox input:checked::after {
content: "";
position: absolute;
left: 5px; top: 1px;
width: 5px; height: 10px;
border: solid var(--white);
border-width: 0 2px 2px 0;
transform: rotate(45deg);
}
/* Badge */
.badge {
display: inline-flex;
align-items: center;
height: 22px;
padding: 0 9px;
font-size: 12px;
font-weight: 500;
border-radius: 999px;
}
.badge-neutral { background: var(--gray-100); color: var(--gray-700); }
.badge-accent { background: rgba(217, 119, 87, 0.14); color: var(--clay); }
.badge-success { background: rgba(120, 140, 93, 0.16); color: var(--olive); }
.badge-warning { background: rgba(199, 142, 63, 0.16); color: #A06A2A; }
</style>
</head>
<body>
<div class="page">
<header>
<h1>Acme design system</h1>
<p class="sub">
Generated from <code>src/styles/tokens.ts</code> and <code>src/components/</code> — use as a portable reference when prompting.
</p>
</header>
<!-- ===================== COLOR ===================== -->
<section id="color">
<h2>Color</h2>
<hr class="rule">
<div class="swatch-group">
<div class="swatch-group-label">Primary</div>
<div class="swatch-grid">
<div class="swatch">
<div class="chip no-border" style="background:#D97757"></div>
<span class="hex">#D97757</span>
<span class="token">--clay</span>
</div>
<div class="swatch">
<div class="chip no-border" style="background:#141413"></div>
<span class="hex">#141413</span>
<span class="token">--slate</span>
</div>
<div class="swatch">
<div class="chip" style="background:#FAF9F5"></div>
<span class="hex">#FAF9F5</span>
<span class="token">--ivory</span>
</div>
<div class="swatch">
<div class="chip no-border" style="background:#E3DACC"></div>
<span class="hex">#E3DACC</span>
<span class="token">--oat</span>
</div>
</div>
</div>
<div class="swatch-group">
<div class="swatch-group-label">Neutral</div>
<div class="swatch-grid">
<div class="swatch">
<div class="chip" style="background:#FFFFFF"></div>
<span class="hex">#FFFFFF</span>
<span class="token">--white</span>
</div>
<div class="swatch">
<div class="chip" style="background:#F0EEE6"></div>
<span class="hex">#F0EEE6</span>
<span class="token">--gray-100</span>
</div>
<div class="swatch">
<div class="chip no-border" style="background:#D1CFC5"></div>
<span class="hex">#D1CFC5</span>
<span class="token">--gray-300</span>
</div>
<div class="swatch">
<div class="chip no-border" style="background:#87867F"></div>
<span class="hex">#87867F</span>
<span class="token">--gray-500</span>
</div>
<div class="swatch">
<div class="chip no-border" style="background:#3D3D3A"></div>
<span class="hex">#3D3D3A</span>
<span class="token">--gray-700</span>
</div>
</div>
</div>
<div class="swatch-group">
<div class="swatch-group-label">Semantic</div>
<div class="swatch-grid">
<div class="swatch">
<div class="chip no-border" style="background:#788C5D"></div>
<span class="hex">#788C5D</span>
<span class="token">--success</span>
</div>
<div class="swatch">
<div class="chip no-border" style="background:#C78E3F"></div>
<span class="hex">#C78E3F</span>
<span class="token">--warning</span>
</div>
<div class="swatch">
<div class="chip no-border" style="background:#B04A4A"></div>
<span class="hex">#B04A4A</span>
<span class="token">--danger</span>
</div>
<div class="swatch">
<div class="chip no-border" style="background:#5C7CA3"></div>
<span class="hex">#5C7CA3</span>
<span class="token">--info</span>
</div>
</div>
</div>
</section>
<!-- ===================== TYPOGRAPHY ===================== -->
<section id="typography">
<h2>Typography</h2>
<hr class="rule">
<div class="type-scale">
<div class="type-row">
<div class="type-specimen t-display">Plan the week ahead</div>
<div class="type-meta">
<span class="name">Display</span>
48 / 1.1 / 500
</div>
</div>
<div class="type-row">
<div class="type-specimen t-h1">Plan the week ahead</div>
<div class="type-meta">
<span class="name">Heading 1</span>
32 / 1.2 / 500
</div>
</div>
<div class="type-row">
<div class="type-specimen t-h2">Plan the week ahead</div>
<div class="type-meta">
<span class="name">Heading 2</span>
24 / 1.3 / 500
</div>
</div>
<div class="type-row">
<div class="type-specimen t-body">Review milestones, assign owners, and surface blockers before they cascade.</div>
<div class="type-meta">
<span class="name">Body</span>
16 / 1.55 / 430
</div>
</div>
<div class="type-row">
<div class="type-specimen t-small">Review milestones, assign owners, and surface blockers before they cascade.</div>
<div class="type-meta">
<span class="name">Small</span>
14 / 1.5 / 430
</div>
</div>
<div class="type-row">
<div class="type-specimen t-caption">UPDATED 2 HOURS AGO</div>
<div class="type-meta">
<span class="name">Caption</span>
12 / 1.4 / 500
</div>
</div>
</div>
</section>
<!-- ===================== SPACING ===================== -->
<section id="spacing">
<h2>Spacing</h2>
<hr class="rule">
<div class="spacing-ruler">
<div class="space-token">
<div class="space-bar" style="width:4px"></div>
<div class="space-label">4<span>--sp-1</span></div>
</div>
<div class="space-token">
<div class="space-bar" style="width:8px"></div>
<div class="space-label">8<span>--sp-2</span></div>
</div>
<div class="space-token">
<div class="space-bar" style="width:12px"></div>
<div class="space-label">12<span>--sp-3</span></div>
</div>
<div class="space-token">
<div class="space-bar" style="width:16px"></div>
<div class="space-label">16<span>--sp-4</span></div>
</div>
<div class="space-token">
<div class="space-bar" style="width:24px"></div>
<div class="space-label">24<span>--sp-5</span></div>
</div>
<div class="space-token">
<div class="space-bar" style="width:32px"></div>
<div class="space-label">32<span>--sp-6</span></div>
</div>
<div class="space-token">
<div class="space-bar" style="width:48px"></div>
<div class="space-label">48<span>--sp-7</span></div>
</div>
<div class="space-token">
<div class="space-bar" style="width:64px"></div>
<div class="space-label">64<span>--sp-8</span></div>
</div>
</div>
</section>
<!-- ===================== RADIUS & ELEVATION ===================== -->
<section id="shape">
<h2>Radius & Elevation</h2>
<hr class="rule">
<div class="token-row">
<div class="radius-card" style="border-radius:4px">
<div class="lbl">4px<span>--r-xs</span></div>
</div>
<div class="radius-card" style="border-radius:8px">
<div class="lbl">8px<span>--r-sm</span></div>
</div>
<div class="radius-card" style="border-radius:12px">
<div class="lbl">12px<span>--r-md</span></div>
</div>
<div class="radius-card" style="border-radius:20px">
<div class="lbl">20px<span>--r-lg</span></div>
</div>
</div>
<div class="token-row">
<div class="shadow-card" style="box-shadow:0 1px 2px rgba(20,20,19,0.06)">
<div class="lbl">--shadow-sm<span>0 1px 2px / 6%</span></div>
</div>
<div class="shadow-card" style="box-shadow:0 4px 10px rgba(20,20,19,0.08)">
<div class="lbl">--shadow-md<span>0 4px 10px / 8%</span></div>
</div>
<div class="shadow-card" style="box-shadow:0 12px 28px rgba(20,20,19,0.12)">
<div class="lbl">--shadow-lg<span>0 12px 28px / 12%</span></div>
</div>
</div>
</section>
<!-- ===================== CORE COMPONENTS ===================== -->
<section id="components">
<h2>Core components</h2>
<hr class="rule">
<div class="component">
<div class="component-name"><Button /></div>
<div class="component-stage">
<button class="btn btn-primary">Create task</button>
<button class="btn btn-secondary">Cancel</button>
<button class="btn btn-ghost">Skip</button>
<button class="btn btn-danger">Delete</button>
</div>
</div>
<div class="component">
<div class="component-name"><Input /></div>
<div class="component-stage">
<input class="input" type="text" placeholder="Search tasks…">
<input class="input" type="text" value="Weekly planning">
</div>
</div>
<div class="component">
<div class="component-name"><Checkbox /></div>
<div class="component-stage">
<label class="checkbox">
<input type="checkbox">
Notify assignees
</label>
<label class="checkbox">
<input type="checkbox" checked>
Archive on complete
</label>
</div>
</div>
<div class="component">
<div class="component-name"><Badge /></div>
<div class="component-stage">
<span class="badge badge-neutral">Draft</span>
<span class="badge badge-accent">In review</span>
<span class="badge badge-success">Done</span>
<span class="badge badge-warning">Overdue</span>
</div>
</div>
</section>
</div>
</body>
</html>
Code of Conduct
Our Pledge
We as members, contributors, and leaders pledge to make participation in our community a harassment-free experience for everyone, regardless of age, body size, visible or invisible disability, ethnicity, sex characteristics, gender identity and expression, level of experience, education, socio-economic status, nationality, personal appearance, race, religion, or sexual identity and orientation.
We pledge to act and interact in ways that contribute to an open, welcoming, diverse, inclusive, and healthy community.
Our Standards
Examples of behavior that contributes to a positive environment include:
- Demonstrating empathy and kindness toward other people
- Being respectful of differing opinions, viewpoints, and experiences
- Giving and gracefully accepting constructive feedback
- Accepting responsibility and apologizing to those affected by our mistakes,
and learning from the experience
- Focusing on what is best for the overall community
Examples of unacceptable behavior include:
- The use of sexualized language or imagery, and sexual attention or advances of
any kind
- Trolling, insulting or derogatory comments, and personal or political attacks
- Public or private harassment
- Publishing others' private information, such as a physical or email address,
without their explicit permission
- Other conduct which could reasonably be considered inappropriate in a
professional setting
Enforcement
Instances of abusive, harassing, or otherwise unacceptable behavior may be reported to the project maintainers at opensource@anthropic.com. All complaints will be reviewed and investigated promptly and fairly.
Attribution
This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 2.1, available at https://www.contributor-covenant.org/version/2/1/code_of_conduct.html.
[homepage]: https://www.contributor-covenant.org
The unreasonable effectiveness of HTML — examples
Sample code. Not maintained and not accepting contributions.
A gallery of standalone HTML examples that accompany the blog post on using HTML as a flexible output format. Each file is a self-contained .html page (no build step, no dependencies) demonstrating a different use case — from code review and design systems to slide decks, status reports, and small interactive editors.
Open `index.html` for the full, categorized index, or open any numbered file directly in a browser.
Contents
| Category | Examples |
|---|---|
| Exploration | code approaches, visual designs |
| Code | review, understanding, design systems, component variants |
| Prototyping | animation, interaction |
| Communication | slide deck, status report, incident report, PR write-up |
| Diagrams & research | flowchart, feature/concept explainers |
| Custom editing UIs | triage board, feature flags, prompt tuner |
Running
There is nothing to install or build. Clone the repo and open index.html (or any individual file) in a web browser.
A note on sample data
All product names, data, and scenarios in these examples are fictional and used only for illustration. The placeholder brand "Acme" and any figures shown are not real.
Security
See SECURITY.md for how to report a vulnerability.
License
Released under the Apache License 2.0.
Security Policy
Reporting a vulnerability
If you believe you have found a security vulnerability in this repository, please report it responsibly.
- Do not open a public issue for security problems.
- Email security@anthropic.com with a description of the issue and steps to
reproduce it.
We will acknowledge your report, investigate, and keep you informed of the resolution.
Scope
This repository contains static, self-contained HTML example files with no server-side components, no build pipeline, and no third-party runtime dependencies. The most likely relevant reports are issues such as unsafe inline script behavior or content that could mislead a reader. General questions about the accompanying blog post are not security issues — please use normal issues for those.
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Choose html-diagram when you need a portable HTML+SVG artifact for browser viewing instead of markdown Mermaid or diagram-as-code in CI pipelines.
FAQ
What does html-diagram do?
Create a self-contained HTML file for visualizing architecture and understanding the stack with a high-quality SVG diagram. Use when the user wants a full-screen diagram, wants.
When should I use html-diagram?
User the user wants a full-screen diagram, wants the output to be light on prose, or wants an HTML artifact that is mostly there to make the architecture click fast.
Is html-diagram safe to install?
Review the Security Audits panel on this page before installing in production.