fill_deductions · FreeTaxUSA MCP Server MCP: Risk & Policy

WHAT IT DOES

What fill_deductions does on FreeTaxUSA MCP Server

AI agents use fill_deductions 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_deductions needs a policy

This tool creates or modifies tax return data by entering deduction information into tax forms. While marked as 'not yet implemented,' its purpose is to write/populate form fields with user-provided deduction details. This is a Write action (creates/modifies data reversibly) rather than Execute because it does not run arbitrary code or trigger external operations—it simply enters structured data into forms.

From the tool's definition Tool is named 'fill_deductions' and described as 'Enter deduction information (standard or itemized).' It fills in tax form fields with deduction data, modifying tax return data reversibly within the browser automation context.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

fill_deductions Rate-limited

fill_deductions 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_deductions": {
      "limits": [
        {
          "counter": "fill_deductions_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_deductions

What does the fill_deductions tool do? +

[Phase 3 - Not yet implemented] Enter deduction information (standard or itemized). 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_deductions? +

Register the FreeTaxUSA MCP Server MCP server in PolicyLayer and add a rule for fill_deductions: 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_deductions? +

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

Can I rate-limit fill_deductions? +

Yes. Add a rate_limit block to the fill_deductions 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_deductions completely? +

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

fill_deductions 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.