Get a list of all expense categories supported by Splitwise. Use subcategory IDs when creating expenses.
AI agents call splitwise_get_categories to retrieve information from Splitwise 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 static reference data (expense categories) from Splitwise. It performs a query operation that returns information without modifying, deleting, or executing any actions. The data retrieved is non-sensitive metadata used to inform other operations (as noted: 'Use subcategory IDs when creating expenses').
From the tool's definition The tool description explicitly states 'Get a list of all expense categories supported by Splitwise', which is a retrieval operation with no side effects. The verb 'Get' and the phrase 'list of' are characteristic of read operations.
Attacks that exploit this kind of access
Get a list of all expense categories supported by Splitwise. Use subcategory IDs when creating expenses. It is categorised as a Read tool in the Splitwise MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Splitwise MCP Server MCP server in PolicyLayer and add a rule for splitwise_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 Splitwise MCP Server. Nothing to install.
splitwise_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 splitwise_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 splitwise_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.
splitwise_get_categories is provided by the Splitwise MCP Server MCP server (svarun115/splitwise-mcp-server). 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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