Run a one-shot performance check against a URL: TTFB, total load time, transfer size, status code, and redirect chain. No authentication required.
AI agents call vs_speed_test to retrieve information from Visual Sentinel MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool retrieves website performance data (TTFB, load time, transfer size, status code, redirect chain) from a target URL without side effects. It is a query/read operation that gathers observational metrics. No data is created, modified, or deleted, and no external code execution is triggered. The lack of authentication requirement further confirms it is a safe, read-only monitoring check.
From the tool's definition Tool name 'vs_speed_test' and description states it 'Run[s] a one-shot performance check against a URL: TTFB, total load time, transfer size, status code, and redirect chain.
Attacks that exploit this kind of access
Run a one-shot performance check against a URL: TTFB, total load time, transfer size, status code, and redirect chain. No authentication required. It is categorised as a Read tool in the Visual Sentinel MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Visual Sentinel MCP Server MCP server in PolicyLayer and add a rule for vs_speed_test: 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 Visual Sentinel MCP Server. Nothing to install.
vs_speed_test 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 vs_speed_test 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 vs_speed_test. 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.
vs_speed_test is provided by the Visual Sentinel MCP Server MCP server (visualsentinel/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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