generate_portfolio_report

THE RISK

Low Risk

Why generate_portfolio_report needs a policy

This tool generates a visual report/image of portfolio performance data. It reads and visualizes financial data without modifying, deleting, or transacting anything. The output is a base64 PNG image, indicating a purely read/display operation. Severity is low as it only retrieves and renders existing data.

From the tool's definition Generate a portfolio performance tracking report image (base64 PNG)

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

POLICY

How to control generate_portfolio_report

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "generate_portfolio_report": {}
  }
}

generate_portfolio_report is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

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

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More MCP Yahoo Finance tools

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All 12 MCP Yahoo Finance tools →

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about generate_portfolio_report

What does the generate_portfolio_report tool do? +

Generate a portfolio performance tracking report image (base64 PNG). It is categorised as a Read tool in the MCP Yahoo Finance MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on generate_portfolio_report? +

Register the MCP Yahoo Finance MCP server in PolicyLayer and add a rule for generate_portfolio_report: 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 MCP Yahoo Finance. Nothing to install.

What risk level is generate_portfolio_report? +

generate_portfolio_report is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit generate_portfolio_report? +

Yes. Add a rate_limit block to the generate_portfolio_report 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 generate_portfolio_report completely? +

Set action: deny in the PolicyLayer policy for generate_portfolio_report. 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 generate_portfolio_report? +

generate_portfolio_report is provided by the MCP Yahoo Finance MCP server (leoncuhk/mcp-yahoo-finance). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MCP Yahoo Finance tool call.

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

CHECK YOUR STACK →