Fast link preview extractor — returns OpenGraph/Twitter Card metadata (title, description, image, favicon, site name, canonical URL, language) for any public URL. Perfect for agents that need to scan many links quickly before deciding which ones deserve deep analysis via /api/web-intelligence ($0...
AI agents call navi_url_preview to retrieve information from Navi X402 without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
url | string | Yes | Full URL to preview (http:// or https://) |
Parameters from the server's own tool schema.
The tool performs read-only extraction of metadata from public URLs. While it involves a financial transaction (USDC payment), the tool itself does not move money between accounts or commit financial obligations — the payment is a separate billing mechanism, not the tool's primary function. The primary function is data retrieval with no side effects on the target URL or any database.
From the tool's definition Tool 'returns OpenGraph/Twitter Card metadata (title, description, image, favicon, site name, canonical URL, language) for any public URL' — purely retrieves and extracts publicly available metadata with no modification, creation, or deletion of data.
Risk signalsAccepts URL/endpoint input (url)
Attacks that exploit this kind of access
Fast link preview extractor — returns OpenGraph/Twitter Card metadata (title, description, image, favicon, site name, canonical URL, language) for any public URL. Perfect for agents that need to scan many links quickly before deciding which ones deserve deep analysis via /api/web-intelligence ($0.005). 5x cheaper than full AI analysis. Latency ~300-800ms. (Paid via x402: $0.001 USDC per call on Base, settled automatically.). It is categorised as a Read tool in the Navi X402 MCP Server, which means it retrieves data without modifying state.
navi_url_preview accepts 1 parameter: url. Required: url. The full parameter table on this page comes from the server's own tool schema.
Register the Navi X402 MCP server in PolicyLayer and add a rule for navi_url_preview: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Navi X402. Nothing to install.
navi_url_preview is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the navi_url_preview rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for navi_url_preview. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
navi_url_preview is provided by the Navi X402 MCP server (navi-x402-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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