Fetch a website and return the content as HTML. Best practices: 1) Always set startCursor=0 for initial requests, and use the fetchedBytes value from previous response for subsequent requests to ensure content continuity. 2) Set contentSizeLimit between 20000-50000 for large pages. 3) When handli...
AI agents call fetch_html to retrieve information from Mult Fetch without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool purely retrieves web content in HTML format with intelligent content extraction and chunking. It has no side effects—it reads remote content without creating, modifying, deleting, or executing operations. The chunking and cursor system are mechanisms for handling large payloads during retrieval, not for mutating data.
From the tool's definition Tool name is 'fetch_html' and description states 'Fetch a website and return the content as HTML' with emphasis on retrieval ('fetch', 'return'). No modification, deletion, or execution capabilities are mentioned.
Documented attack patterns abuse exactly the kind of access fetch_html gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mult Fetch, and nothing reaches the server without passing your rules. This is the rule we recommend for fetch_html:
{
"version": "1",
"default": "deny",
"tools": {
"fetch_html": {}
}
}fetch_html 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.
Fetch a website and return the content as HTML. Best practices: 1) Always set startCursor=0 for initial requests, and use the fetchedBytes value from previous response for subsequent requests to ensure content continuity. 2) Set contentSizeLimit between 20000-50000 for large pages. 3) When handling large content, use the chunking system by following the startCursor instructions in the system notes rather than increasing contentSizeLimit. 4) If content retrieval fails, you can retry using the same chunkId and startCursor, or adjust startCursor as needed but you must handle any resulting data duplication or gaps yourself. 5) Always explain to users when content is chunked and ask if they want to continue retrieving subsequent parts. It is categorised as a Read tool in the Mult Fetch MCP Server, which means it retrieves data without modifying state.
Register the Mult Fetch MCP server in PolicyLayer and add a rule for fetch_html: 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 Mult Fetch. Nothing to install.
fetch_html 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 fetch_html 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 fetch_html. 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.
fetch_html is provided by the Mult Fetch MCP server (lmcc-dev/mult-fetch-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Mult Fetch, 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.
5 Mult Fetch tools catalogued and risk-classified — across an index of 43,000+ MCP servers.