Create a new expense. Can split equally among group members or specify custom shares for each user. For custom shares, provide users array with paid_share and owed_share for each user.
AI agents use splitwise_create_expense to create or update resources in Splitwise MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Splitwise MCP Server environment.
This tool creates a new expense record in Splitwise, which is a reversible write operation (expenses can be deleted). While it involves financial tracking, it does not move real money or commit actual financial obligations — it only records shared expense data. The most severe applicable category is Write. Severity is medium because misuse could create incorrect expense splits affecting multiple users' balances.
From the tool's definition Create a new expense. Can split equally among group members or specify custom shares for each user.
Attacks that exploit this kind of access
Create a new expense. Can split equally among group members or specify custom shares for each user. For custom shares, provide users array with paid_share and owed_share for each user. It is categorised as a Write tool in the Splitwise MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Splitwise MCP Server MCP server in PolicyLayer and add a rule for splitwise_create_expense: 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_create_expense is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the splitwise_create_expense 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_create_expense. 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_create_expense 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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