splitwise_add_comment · Splitwise MCP Server MCP

WHAT IT DOES

What splitwise_add_comment does on Splitwise MCP Server

AI agents use splitwise_add_comment 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_comment needs a policy

Adding a comment creates new data in the Splitwise system but does not delete, modify existing records irreversibly, execute code, move money, or trigger external operations. The action is reversible (comments can typically be deleted via splitwise_delete_comment, which exists as a sibling tool), making it a Write operation.

From the tool's definition Tool name 'splitwise_add_comment' and description 'Add a comment to an expense' indicate creation of a new comment record, which is a reversible write operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

splitwise_add_comment Rate-limited

splitwise_add_comment 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_comment": {
      "limits": [
        {
          "counter": "splitwise_add_comment_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_comment

What does the splitwise_add_comment tool do? +

Add a comment to an expense. 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_comment? +

Register the Splitwise MCP Server MCP server in PolicyLayer and add a rule for splitwise_add_comment: 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_comment? +

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

Can I rate-limit splitwise_add_comment? +

Yes. Add a rate_limit block to the splitwise_add_comment 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_comment completely? +

Set action: deny in the PolicyLayer policy for splitwise_add_comment. 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_comment? +

splitwise_add_comment 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.