fill_w2_income · FreeTaxUSA MCP Server MCP: Risk & Policy

WHAT IT DOES

What fill_w2_income does on FreeTaxUSA MCP Server

AI agents use fill_w2_income to create or update resources in FreeTaxUSA MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your FreeTaxUSA MCP Server environment.

WHY IT NEEDS A POLICY

Why fill_w2_income needs a policy

This tool modifies tax form data by entering W-2 income information. While not Destructive (data can be corrected), it is Write because it creates or modifies data reversibly. Severity is high because incorrect W-2 entries directly affect tax liability calculations, refund amounts, and IRS submissions—misuse by an AI agent could result in significantly incorrect filings.

From the tool's definition Tool name 'fill_w2_income' and description 'Enter W-2 wage data' indicate data entry/modification. The server context shows this automates tax filing through browser automation, making this a Write operation that modifies tax form data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

fill_w2_income Rate-limited

fill_w2_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": {
    "fill_w2_income": {
      "limits": [
        {
          "counter": "fill_w2_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 FreeTaxUSA MCP Server, so you can run agents against it safely.

FAQ

Questions about fill_w2_income

What does the fill_w2_income tool do? +

[Phase 2 - Not yet implemented] Enter W-2 wage data. It is categorised as a Write tool in the FreeTaxUSA 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 fill_w2_income? +

Register the FreeTaxUSA MCP Server MCP server in PolicyLayer and add a rule for fill_w2_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 FreeTaxUSA MCP Server. Nothing to install.

What risk level is fill_w2_income? +

fill_w2_income is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit fill_w2_income? +

Yes. Add a rate_limit block to the fill_w2_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 fill_w2_income completely? +

Set action: deny in the PolicyLayer policy for fill_w2_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 fill_w2_income? +

fill_w2_income is provided by the FreeTaxUSA MCP Server MCP server (schwarztim/freetaxusa-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.