Server data from the Official MCP Registry
Clean Markdown and AI-readability scoring for any URL. Built for AI agents.
Clean Markdown and AI-readability scoring for any URL. Built for AI agents.
This is a well-structured MCP server for the Onto Read API with proper authentication via API key, input validation using Zod, and appropriate error handling. The server correctly enforces the required ONTO_API_KEY environment variable at startup, validates all tool inputs, and makes authenticated calls to a third-party API. Permissions (network_http and env_vars) align appropriately with the server's stated purpose of reading and scoring URLs via the Onto API. Supply chain analysis found 3 known vulnerabilities in dependencies (0 critical, 2 high severity). Package verification found 1 issue.
7 files analyzed · 7 issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
This plugin requests these system permissions. Most are normal for its category.
Set these up before or after installing:
Environment variable: ONTO_API_KEY
Environment variable: ONTO_API_BASE
Add this to your MCP configuration file:
{
"mcpServers": {
"io-github-ravixalgorithm-onto": {
"env": {
"ONTO_API_KEY": "your-onto-api-key-here",
"ONTO_API_BASE": "your-onto-api-base-here"
},
"args": [
"-y",
"@ontosdk/mcp"
],
"command": "npx"
}
}
}From the project's GitHub README.
The official Onto Model Context Protocol server. Add clean web content reading and AI-readability scoring to Claude Code, Cursor, Cline, Zed, or any MCP-compatible AI client.
Onto's MCP server exposes three tools to any AI agent:
read_url — Read any URL and get back clean, agent-ready Markdown (typically 10× smaller than raw HTML)score_url — Get the AIO (AI-readability) score for any URL with a breakdown of what helps and what hurts AI consumptionread_and_score — Both at once: clean content plus quality assessment so the agent knows how much to trust the sourceThis is the official MCP wrapper for the Onto Read API.
When AI agents read websites today, they parse hundreds of KB of React noise to find a few KB of actual content. This burns tokens and causes hallucinations.
Onto strips the noise server-side, returns the agent-ready format, and reports a confidence score for the source. One tool call, one accurate answer.
Sign up at app.buildonto.dev and create an API key at Read → Keys.
Free tier: 1,000 requests / month. No credit card.
Add to your Claude Code MCP config:
{
"mcpServers": {
"onto": {
"command": "npx",
"args": ["-y", "@ontosdk/mcp"],
"env": {
"ONTO_API_KEY": "onto_sk_live_your_key_here"
}
}
}
}
Restart Claude Code. The read_url, score_url, and read_and_score tools will appear in the available tools list.
Add to Cursor's MCP configuration (Settings → Features → MCP):
{
"mcpServers": {
"onto": {
"command": "npx",
"args": ["-y", "@ontosdk/mcp"],
"env": {
"ONTO_API_KEY": "onto_sk_live_your_key_here"
}
}
}
}
See examples/ for Cline, Zed, and Continue configs.
In Claude Code or Cursor, try:
Read https://stripe.com/pricing using Onto and summarize the pricing tiers.
The agent calls read_url, gets clean Markdown, and returns an accurate summary without parsing hundreds of KB of layout HTML.
read_urlReturns clean Markdown for a URL with metadata about the extraction (sizes, reduction %, cache state).
Input:
| Field | Type | Required | Description |
|---|---|---|---|
url | string | yes | Publicly accessible HTTP(S) URL |
fresh | boolean | no | If true, bypass cache (default: false) |
score_urlReturns the AIO (AI-readability) score for a URL — 0-100 with a letter grade, hallucination risk, and a structured list of penalties / benefits / recommendations.
Input:
| Field | Type | Required | Description |
|---|---|---|---|
url | string | yes | URL to score |
read_and_scoreReturns clean Markdown plus the AIO score in one call. Recommended default for agentic workflows.
Input: same as read_url.
| Tier | Monthly requests | Price |
|---|---|---|
| Free | 1,000 | $0 |
| Starter | 10,000 | $9 |
| Growth | 100,000 | $49 |
| Scale | 500,000 | $250 |
| Enterprise | Custom | Contact sales |
Manage your subscription at app.buildonto.dev/read/billing. Credit packs ($5–$200) are available for overflow once you're on a paid tier.
Environment variables:
ONTO_API_KEY (required) — Your Onto API key from app.buildonto.dev/read/keysONTO_API_BASE (optional) — Override the API base URL (default: https://api.buildonto.dev)Verify your key at app.buildonto.dev/read/keys. If you recently rotated keys, your MCP config may have a stale value.
You've used your monthly allotment. Upgrade at app.buildonto.dev/read/billing or wait for the monthly reset. Paid tiers can also top up with credit packs.
npx is on your PATHThe target site may be slow or unreachable. Onto's request timeout is 15 seconds. Retry, or try a different URL.
Onto is the compatibility layer for the agent web. Three products on one engine:
Built for AI agents reading the web. Built so they read it correctly.
MIT
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