Fetch the raw text of a URL, truncated to the configured limit.
AI agents call fetch_url to retrieve information from Friday 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 data from a URL and returns it as text. It has no side effects on the target resource or the system. While fetching from untrusted URLs could theoretically expose sensitive information if the agent is naive, the tool itself is fundamentally a read operation. The truncation limit further constrains potential data exfiltration.
From the tool's definition Tool description states 'Fetch the raw text of a URL' — a retrieval operation with no modification, deletion, or execution of code. The verb 'fetch' and the purpose of obtaining content are characteristic of Read category tools.
Attacks that exploit this kind of access
Fetch the raw text of a URL, truncated to the configured limit. It is categorised as a Read tool in the Friday MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Friday MCP Server MCP server in PolicyLayer and add a rule for fetch_url: 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 Friday MCP Server. Nothing to install.
fetch_url 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_url 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_url. 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_url is provided by the Friday MCP Server MCP server (jeremylakeyjr/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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