Get all available expense categories in a hierarchical structure.
AI agents call get_available_categories to retrieve information from Expense Tracker MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only fetches or retrieves structured data about expense categories. It performs no modifications, deletions, code execution, or financial operations. It is a simple query operation that returns reference data, fitting the 'Read' category with low severity since exposure poses minimal risk—the data retrieved is non-sensitive structural information.
From the tool's definition Tool name 'get_available_categories' and description 'Get all available expense categories in a hierarchical structure' indicate a retrieval operation with no side effects.
Attacks that exploit this kind of access
Get all available expense categories in a hierarchical structure. It is categorised as a Read tool in the Expense Tracker MCP MCP Server, which means it retrieves data without modifying state.
Register the Expense Tracker MCP server in PolicyLayer and add a rule for get_available_categories: 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 Expense Tracker MCP. Nothing to install.
get_available_categories 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_available_categories 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_available_categories. 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_available_categories is provided by the Expense Tracker MCP server (keyurgit45/expense-tracker-mcp). 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.
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