Extract structured data from web pages based on a schema. Args: urls: List of URLs to extract data from prompt: A prompt describing what data to extract schema: JSON schema defining the structure of data to extract Returns: The extracted structured data
AI agents call extract_structured_data to retrieve information from ReActMCP Web Search without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs data retrieval and transformation of existing web content into a structured format. It reads web pages and returns parsed information without creating, modifying, deleting, or executing any operations. This is a classic Read category operation similar to search, fetch, and scrape functions on the same server.
From the tool's definition Tool 'extract_structured_data' retrieves and parses data from web pages based on a schema and prompt. Description explicitly states it 'Extract[s] structured data from web pages' with returns of 'extracted structured data' only.
Documented attack patterns abuse exactly the kind of access extract_structured_data gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and ReActMCP Web Search, and nothing reaches the server without passing your rules. This is the rule we recommend for extract_structured_data:
{
"version": "1",
"default": "deny",
"tools": {
"extract_structured_data": {}
}
}extract_structured_data is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
Extract structured data from web pages based on a schema. Args: urls: List of URLs to extract data from prompt: A prompt describing what data to extract schema: JSON schema defining the structure of data to extract Returns: The extracted structured data. It is categorised as a Read tool in the ReActMCP Web Search MCP Server, which means it retrieves data without modifying state.
Register the ReActMCP Web Search MCP server in PolicyLayer and add a rule for extract_structured_data: 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 ReActMCP Web Search. Nothing to install.
extract_structured_data 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 extract_structured_data 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 extract_structured_data. 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.
extract_structured_data is provided by the ReActMCP Web Search MCP server (mshojaei77/reactmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from ReActMCP Web Search, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
7 ReActMCP Web Search tools catalogued and risk-classified — across an index of 43,000+ MCP servers.