send_web_vitals

THE RISK

Medium Risk

Why send_web_vitals needs a policy

This tool sends (writes) web performance metrics to an external analytics API. While it creates data in a remote system, the operation is reversible and low-risk: web vitals are non-sensitive telemetry data, sending duplicates or erroneous data causes no financial harm or data loss. The deprecation notice suggests this is legacy functionality.

From the tool's definition Tool description states 'Send web vitals data to Speed Insights API' - this is a write operation that transmits data to an external service.

Documented attack patterns abuse exactly the kind of access send_web_vitals gives an agent:

POLICY

How to control send_web_vitals

PolicyLayer is an MCP gateway — it sits between your AI agents and eToro MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for send_web_vitals:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "send_web_vitals": {
      "limits": [
        {
          "counter": "send_web_vitals_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

send_web_vitals stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register eToro MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about send_web_vitals

What does the send_web_vitals tool do? +

Send web vitals data to Speed Insights API (Deprecated: Use @vercel/speed-insights package instead). It is categorised as a Write tool in the eToro MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on send_web_vitals? +

Register the eToro MCP Server MCP server in PolicyLayer and add a rule for send_web_vitals: 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 eToro MCP Server. Nothing to install.

What risk level is send_web_vitals? +

send_web_vitals is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit send_web_vitals? +

Yes. Add a rate_limit block to the send_web_vitals 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.

How do I block send_web_vitals completely? +

Set action: deny in the PolicyLayer policy for send_web_vitals. 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.

What MCP server provides send_web_vitals? +

send_web_vitals is provided by the eToro MCP Server MCP server (shlomico-tr/etoroportfoliomcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every eToro MCP Server tool call.

Start from eToro MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →