Fetches the raw HTML content from a URL
AI agents call fetch_html to retrieve information from Fetch MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves web content without creating, modifying, deleting, or executing any operations. It is a passive read-only operation that queries and returns HTML data from a specified URL. The lack of mutation, execution, or destructive capabilities places it firmly in the Read category with low severity.
From the tool's definition Tool name is 'fetch_html' and description states it 'Fetches the raw HTML content from a URL' — this is a data retrieval operation with no side effects or modifications to any system.
Attacks that exploit this kind of access
Fetches the raw HTML content from a URL. It is categorised as a Read tool in the Fetch MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Fetch MCP Server 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 Fetch MCP Server. 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 Fetch MCP Server MCP server (solonabot/fetch-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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