Lista los gastos del usuario (rango opcional por fecha).
AI agents call expense.list to retrieve information from Mcp Finance without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves expense records filtered by optional date range. It performs no side effects, does not modify, delete, or execute operations. The capability is purely informational—listing existing data. Even in a financial domain, read-only access to expense summaries poses minimal risk when properly scoped to the authenticated user's own data.
From the tool's definition Tool name 'expense.list' and description 'Lista los gastos del usuario (rango opcional por fecha)' (Lists the user's expenses with optional date range) indicate data retrieval with no modification or deletion.
Attacks that exploit this kind of access
Lista los gastos del usuario (rango opcional por fecha). It is categorised as a Read tool in the Mcp Finance MCP Server, which means it retrieves data without modifying state.
Register the Mcp Finance MCP server in PolicyLayer and add a rule for expense.list: 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 Finance. Nothing to install.
expense.list 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 expense.list 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 expense.list. 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.
expense.list is provided by the Mcp Finance MCP server (toothlesstarantula/mcp-finance). 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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