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API reference llms.txt
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Introduction[01]

Get an agent reading the web properly

Onto turns any page into clean Markdown with a score for how trustworthy that text is — and turns your own site into something agents can read without parsing your markup. Pick a path below; the quickest takes about thirty seconds.

Start here

[02]
30 sec[01]
Install in
One command
$ claude mcp add --scope user --transport http onto https://api.buildonto.dev/mcp
Docs →
  1. Run it in a terminal. Claude Code asks you to approve Onto on first use.
  2. Then ask Claude Code to “read example.com with onto”.
10 sec[02]

Try it in Claude Code

Paste this into a new chat. Markdown back means the install worked.

Read https://example.com with onto and show me the Markdown.

1 min[03]

Sign in for a key

For direct API calls and the npx and config-file installs. The URL and command installs don't need one.

30 sec[04]

Or call the API, no client

One POST from any terminal. Markdown comes back.

curl -X POST https://api.buildonto.dev/v1/read \
  -H "Authorization: Bearer $ONTO_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"url": "https://example.com"}'

Or start from the job you are doing

Give an agent the webread_and_score in a tool loop, and what to do when a page scores badly.Index a whole documentation sitemap → batch → store, including the two caps that silently truncate you.Audit a site for agent readabilityScore every page, rank the worst, and fix in the order that moves the most.