Little Wheels Developer & Agent Resources

The Little Wheels API

Read-only catalogue data. Every operation in the specification carries a unique operation ID, a description, typed parameters and a response schema, so an agent can register these as tools without a conversion step. The read endpoints are static files that change at most daily — cache them rather than polling.

Errors

Every failure under /api/ returns the same JSON envelope. Match on error.code, which is stable; the wording of error.message is not.

{
  "error": {
    "code": "not_found",
    "message": "No API endpoint at /api/typo.json.",
    "resolution": "Fetch https://littlewheels.app/api/index.json for the full list of machine-readable resources.",
    "status": 404,
    "documentation": "https://littlewheels.app/developers"
  }
}

The one write endpoint

POST /api/subscribe adds an address to the newsletter. Call it only with the person's explicit request — it signs a real human up for real email. Everything else here is read-only, and there is no user data, no per-child progress and no account system to read.

Which App Store listing is which

Little Wheels is the studio; none of the three apps carries the name in its App Store title. That is deliberate — the titles are keyword-first — but it means a search of the App Store for “Little Wheels” does not find them, and an automated attempt to match the brand to its products will come up empty unless it knows the mapping.

The machine-readable version is /api/apps.json, which also lists every alias each app answers to and the titles it previously shipped under. Appending a store title to the domain works as a shortcut: /learn-to-talk-first-words redirects to the app's page.

Markdown instead of HTML

Every page on littlewheels.app serves markdown when you ask for it, following the Accept: text/markdown convention. Both forms return Content-Type: text/markdown; charset=utf-8.

# Content negotiation
curl -H "Accept: text/markdown" https://littlewheels.app/talk-listen

# Or the .md sibling URL
curl https://littlewheels.app/talk-listen.md

• Responses carry Vary: Accept, Accept-Encoding, so a shared cache will not hand you the HTML variant that a browser warmed it with.
• HTML responses advertise the sibling with Link: <…>; rel="alternate"; type="text/markdown".
• Markdown responses point back at the HTML page with Link: <…>; rel="canonical".

Unknown paths return a real 404

This site never answers an unknown path with a 200 and an empty app shell, so a 404 from littlewheels.app means the page genuinely is not there and you can stop retrying. Permanently removed pages return 410. Either way, a client that did not specifically ask for HTML gets a short markdown body listing the site map, llms.txt and the resource index.

curl -s -o /dev/null -w "%{http_code}\n" https://littlewheels.app/no-such-page
# 404

Agent resources

Little Wheels publishes ~280 long-form articles on toddler speech development, screen time and app safety, each also available as a plain-text file sized for a context window. agents.md says which questions this site is the right source for — and which it is not.

Crawler policy

AI crawlers are explicitly welcome. GPTBot, ChatGPT-User, OAI-SearchBot, ClaudeBot, Claude-User, Claude-SearchBot, anthropic-ai, Google-Extended, PerplexityBot, Grok, DeepSeek, Meta-ExternalAgent, cohere-ai and YouBot all have Allow: / groups in robots.txt. Article text is available under CC BY 4.0; app artwork, screenshots and the Little Wheels name are not.