supply_defense_document

THE RISK

Medium Risk

Why supply_defense_document needs a policy

The tool uploads/creates supporting documents in an active AFIP dispute proceeding, which modifies the dispute record state reversibly. This is a Write operation (not Destructive, as documents can be amended or removed; not Execute, as it's data submission not code execution).

From the tool's definition Tool name 'supply_defense_document' and description 'Upload a supporting document' indicate file/document creation or modification in a dispute context.

Documented attack patterns abuse exactly the kind of access supply_defense_document gives an agent:

POLICY

How to control supply_defense_document

PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Afip, and nothing reaches the server without passing your rules. This is the rule we recommend for supply_defense_document:

policy.json

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

supply_defense_document 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.

Create a free account and register Mcp Afip — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about supply_defense_document

What does the supply_defense_document tool do? +

Upload a supporting document for an ongoing dispute defense (Dispute Service v30). It is categorised as a Write tool in the Mcp Afip MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on supply_defense_document? +

Register the Mcp Afip MCP server in PolicyLayer and add a rule for supply_defense_document: 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 Mcp Afip. Nothing to install.

What risk level is supply_defense_document? +

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

Can I rate-limit supply_defense_document? +

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

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

supply_defense_document is provided by the Mcp Afip MCP server (codespar/mcp-dev-latam). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Mcp Afip tool call.

Start from Mcp Afip, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →