AI agents call web_extract_structured to retrieve information from Data Apis without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries structured data from web pages without creating, modifying, or deleting anything. It is a Read operation. Severity is medium rather than low because: (1) web scraping can be misused to extract sensitive data from private or protected pages, (2) the $0.05 cost suggests it may access external data with privacy implications, and (3) an AI agent could abuse it to harvest credentials, API…
From the tool's definition Tool description states it performs 'extraction: text, tables, JSON-LD, metadata from any URL' with no modification or deletion capabilities mentioned.
Attacks that exploit this kind of access
Full structured extraction: text, tables, JSON-LD, metadata from any URL. Costs $0.05 USDC per request via x402 on Base. It is categorised as a Read tool in the Data Apis MCP Server, which means it retrieves data without modifying state.
Register the Data Apis MCP server in PolicyLayer and add a rule for web_extract_structured: 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 Data Apis. Nothing to install.
web_extract_structured 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 web_extract_structured 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 web_extract_structured. 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.
web_extract_structured is provided by the Data Apis MCP server (yantrix-ai/x402-apis-mcp-server). 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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