saturnai.tools · connect
Paste this sentence into any assistant that can open a web page. From then on it studies real references before it builds — no install, no account.
Connect to SaturnAI at https://saturnai.tools/design/llms.txtthe agent brain
saturnai.tools · the agent’s door
The host an AI assistant fetches before it builds UI, brand, growth, copy or pricing: a 577-card library of studied real work, one committed direction, and a measured verdict before anything ships.
Free. Anonymous: 60 calls an hour. A free izzy.la account opens full card DNA and 600 an hour. There is no paid tier.
Not a demo. This form posts to POST /api/design/call — the same endpoint your
assistant calls — and prints what came back: one committed direction, the decoration it refuses, and the
technique slots its build has to fill. The cards it drew on come forward in the sky above.
Nothing is stored. The response is the real tool output, trimmed to four fields; your assistant receives the whole object, including the DTCG tokens and the build checklist.
01 · the loop
An assistant connected to this host runs the same loop on every design task: intake before anything is built, compose for one direction, review after the build. Writer never grades writer.
Turns what the human actually said into a 20-field context ledger and asks about every field it cannot infer, recommended answer first. Only when all 20 are settled does it write the builder prompt — which calls compose. Nothing gets built from a one-line brief.
Returns one named direction with typed constraints and DTCG tokens, plus premium_stack:
the technique ladder for the brief’s surface — required slots with alternatives, recommended reaches,
and the priced-in decoration to refuse. It also returns announce.say, a plain-words line to
relay before building. The direction is binding, not a mood board to sample from. Never clone one card.
Measures the rendered page — WCAG contrast maths, layout logic per section, technique depth against the required slots, and priced-in decoration — and returns PASS, REVISE with the exact fix list, or REJECT. It runs from a fresh context, because the writer never grades its own work.
Premium is the default, not the upgrade: one technique per required slot, or the deviation is declared with a reason. Every technique card costs $0 to run.
02 · the verdict — real receipts
After a build, a fresh context runs collect-evidence.js in the rendered page — computed colours,
contrast maths, layout logic, technique probes — and posts the measurements to review. What comes
back is the object below. These two were issued against the engine’s own review fixtures on the date each
card names; the rubric rows, the scores and the evidence lines are verbatim.
100% evidence coverage · 5 contrast pairs measured, lowest 6.09:1 · no slop tell fired · 10 technique slots proven, 4 declared, 0 missing
No blocker. Every check that could run, ran.
100% evidence coverage · 2 contrast pairs measured, lowest 18.43:1 · 7 hard slop tells (purple_gradient_default, priced_in_aos_fadeup, priced_in_particles_bg) · 0 technique slots proven, 0 declared, 14 missing
4 blockers: 7 hard slop tell(s) · 1 failed checklist item(s) · logo test failed · 14 unmet premium-stack slot(s): a11y-gate, audit, color-system, cwv-gate, fonts, framework, images, lcp-priority, motion-a11y, navigation-feel, prerender, scroll-choreography, type-motion, type-precision
Scope, stated by the reviewer itself: these are rule checks on supplied evidence. The service did not browse the page, inspect screenshots, or verify reviewer independence. A missing check is reported as NOT_ASSESSED and can block a PASS — it never grants one.
03 · connect — cheapest first
Paste this sentence. No install, no account. The assistant reads the file and follows it from then on, on every design task.
Connect to SaturnAI at https://saturnai.tools/design/llms.txtStreamable HTTP. Add it as a custom connector, or drop it into your client’s MCP config. Discovery lives
at /.well-known/mcp.json, where the server is keyed saturndesign; the initialize
handshake answers as saturnai — same server.
https://saturnai.tools/api/mcpThe same tools with no client at all — the call the playground above just made. GET /api/design
describes the endpoints, the free-tier shape, and the rate limits.
curl -s https://saturnai.tools/api/design/call \
-H "Content-Type: application/json" \
-d '{"name":"compose","arguments":{"brief":"landing page for a coffee roaster"}}'Writes the pack to ~/.saturnai/agent and prints MCP config with absolute paths already
filled in. If you are an agent: the hosted API is the same operate path — do not run this.
curl -fsSL https://saturnai.tools/design/agent/install.mjs -o saturnai-install.mjs && node saturnai-install.mjsMint a key at /design/account/ and send it as a header. It is free: there is no paid tier and nothing to buy. Anonymous already gets the full catalog, every blueprint, and 11 full write-ups; the key opens the full lane and raises the limit from 60 to 600 calls per hour.
Authorization: Bearer <your key>04 · what is inside
The 497 studies are apps, brands, patterns, movements, platforms, recipes, copy systems, offers and growth loops — each written up as what to steal and what to avoid, with the failure modes people usually miss. The 80 technique cards each carry dated browser support, a build recipe, a fallback, and the probe that proves the technique is actually in the page.
05 · access
This host is for your assistant. The project page is for you.
What SaturnAI is, why it exists, and whether it is for you lives at saturnai.dev. This host stays a connection sheet, so an assistant can read it without wading through a landing page. The feature explainer for Swarm is kept at saturnswarm.com/os/.