add_income · Personal Finance Tracker MCP: Risk & Policy

WHAT IT DOES

What add_income does on Personal Finance Tracker

AI agents use add_income to create or update resources in Personal Finance Tracker — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Personal Finance Tracker environment.

WHY IT NEEDS A POLICY

Why add_income needs a policy

This tool creates new income records in the finance tracker. While it modifies financial data, it is categorized as Write rather than Financial because it records income information (a data entry operation) rather than moving money or committing financial obligations. The severity is medium because misuse could lead to inflated income records affecting budget analysis, but no actual money moves.

From the tool's definition Tool name is 'add_income' which indicates creating or modifying financial records. The server is a 'Personal Finance Tracker' that manages 'income' data using SQLite, indicating reversible creation of financial data entries.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_income Rate-limited

add_income 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": {
    "add_income": {
      "limits": [
        {
          "counter": "add_income_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 Personal Finance Tracker, so you can run agents against it safely.

FAQ

Questions about add_income

What does the add_income tool do? +

add_income. It is categorised as a Write tool in the Personal Finance Tracker MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on add_income? +

Register the Personal Finance Tracker MCP server in PolicyLayer and add a rule for add_income: 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 Personal Finance Tracker. Nothing to install.

What risk level is add_income? +

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

Can I rate-limit add_income? +

Yes. Add a rate_limit block to the add_income 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 add_income completely? +

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

add_income is provided by the Personal Finance Tracker MCP server (lantip/mcp-personal-finance-tracker). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.