splitwise_add_user_to_group · Splitwise MCP Server MCP

WHAT IT DOES

What splitwise_add_user_to_group does on Splitwise MCP Server

AI agents use splitwise_add_user_to_group 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.

WHY IT NEEDS A POLICY

Why splitwise_add_user_to_group needs a policy

This tool modifies group membership by adding a user to a group. While it creates a relationship, the action is reversible (users can be removed), distinguishing it from destructive operations. It does not delete data, execute arbitrary code, or move money. The severity is medium because unauthorized additions could compromise group privacy or financial data sharing without being catastrophic or irreversible.

From the tool's definition Tool name 'splitwise_add_user_to_group' and description 'Add a user to an existing group' indicate creation/modification of group membership, which is a reversible write operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

splitwise_add_user_to_group Rate-limited

splitwise_add_user_to_group stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "splitwise_add_user_to_group": {
      "limits": [
        {
          "counter": "splitwise_add_user_to_group_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Splitwise MCP Server, so you can run agents against it safely.

FAQ

Questions about splitwise_add_user_to_group

What does the splitwise_add_user_to_group tool do? +

Add a user to an existing group. Provide either user_id or email/first_name/last_name. 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.

How do I enforce a policy on splitwise_add_user_to_group? +

Register the Splitwise MCP Server MCP server in PolicyLayer and add a rule for splitwise_add_user_to_group: 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.

What risk level is splitwise_add_user_to_group? +

splitwise_add_user_to_group is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit splitwise_add_user_to_group? +

Yes. Add a rate_limit block to the splitwise_add_user_to_group 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.

How do I block splitwise_add_user_to_group completely? +

Set action: deny in the PolicyLayer policy for splitwise_add_user_to_group. 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.

What MCP server provides splitwise_add_user_to_group? +

splitwise_add_user_to_group 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.