AI agents call get_categories to retrieve information from Tiller Money 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 category data from financial records in a read-only context. No mutations, deletions, financial transactions, or code execution are involved. The severest impact would be unauthorized data exposure, but the read-only design limits blast radius to information disclosure rather than operational harm.
From the tool's definition Server is described as 'read-only access to Tiller Money financial data' and tool is a sibling to 'get_accounts', 'get_transaction_details', and 'get_transactions', which are all retrieval operations. Tool name 'get_categories' follows the read pattern.
Documented attack patterns abuse exactly the kind of access get_categories gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Tiller Money MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_categories:
{
"version": "1",
"default": "deny",
"tools": {
"get_categories": {}
}
}get_categories is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
get_categories. It is categorised as a Read tool in the Tiller Money MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Tiller Money MCP Server MCP server in PolicyLayer and add a rule for get_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 Tiller Money MCP Server. Nothing to install.
get_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_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_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_categories is provided by the Tiller Money MCP Server MCP server (jackstein21/tiller-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Tiller Money MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
4 Tiller Money MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.