AI agents call get_portfolio to retrieve information from Paper 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 portfolio data for informational purposes only. Even though it accesses financial account information, it performs no financial transactions, writes no data, and executes no operations. Read operations on financial data are categorized as 'Read' with low severity because they have no side effects and do not expose the system to irreversible or actionable financial risk.
From the tool's definition Tool name 'get_portfolio' and description 'Get portfolio details' indicate a retrieval operation that queries portfolio information without modifying, deleting, or executing actions.
Documented attack patterns abuse exactly the kind of access get_portfolio gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Paper MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_portfolio:
{
"version": "1",
"default": "deny",
"tools": {
"get_portfolio": {}
}
}get_portfolio is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get portfolio details. It is categorised as a Read tool in the Paper MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Paper MCP Server MCP server in PolicyLayer and add a rule for get_portfolio: 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 Paper MCP Server. Nothing to install.
get_portfolio 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 get_portfolio 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 get_portfolio. 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.
get_portfolio is provided by the Paper MCP Server MCP server (paperinvest/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Paper MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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23 Paper MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.