AI agents call web_fetch to retrieve information from Maple without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves data from public web pages with no side effects, modifications, or code execution. It is a straightforward data retrieval operation analogous to a GET request. The restriction to 'public' URLs and 'readable content extraction' further confirms it only reads, does not write or execute. Severity is low as misuse would at worst result in retrieval of unintended public information.
From the tool's definition Tool name 'web_fetch' and description 'Fetch and extract readable content from a public web page URL' indicate retrieval of data without modification or execution of operations.
Attacks that exploit this kind of access
Fetch and extract readable content from a public web page URL. It is categorised as a Read tool in the Maple MCP Server, which means it retrieves data without modifying state.
Register the Maple MCP server in PolicyLayer and add a rule for web_fetch: 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 Maple. Nothing to install.
web_fetch 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_fetch 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_fetch. 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_fetch is provided by the Maple MCP server (omar2001ramadan/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
web_fetch is one line of Maple's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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