add_case_tag

THE RISK

Medium Risk

Why add_case_tag needs a policy

Adding a tag is a reversible write operation that modifies case metadata without affecting financial transactions, destroying data, or executing external code. The action is easily undoable (tags can be removed). While this tool operates on AFIP tax authority systems, the specific operation is limited to organizational metadata management, keeping severity low.

From the tool's definition The tool description states 'Add a tag to a case' and clarifies that tags are 'operator-facing labels useful for grouping / filtering investigations.' This is a metadata operation that creates or modifies a label/tag association.

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

POLICY

How to control add_case_tag

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 add_case_tag:

policy.json

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

add_case_tag 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.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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All 1300 Mcp Afip tools →

Write tools on other servers

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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 add_case_tag

What does the add_case_tag tool do? +

Add a tag to a case. Tags are operator-facing labels useful for grouping / filtering investigations (e.g. 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 add_case_tag? +

Register the Mcp Afip MCP server in PolicyLayer and add a rule for add_case_tag: 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 add_case_tag? +

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

Can I rate-limit add_case_tag? +

Yes. Add a rate_limit block to the add_case_tag 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_case_tag completely? +

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

add_case_tag 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 →