signature_icp_create

THE RISK

Medium Risk

Why signature_icp_create needs a policy

This tool creates (writes) a new digital signature envelope object and returns identifiers. While it modifies state by creating signature records, it does not delete, destroy, or execute arbitrary code—it reversibly creates a structured data artifact. In the AFIP context (Argentine tax authority), digital signature envelopes are formal documents subject to audit, making misuse a significant compliance risk.

From the tool's definition The tool 'signature_icp_create' performs a 'Create' action that generates a digital signature envelope with an envelope_id for one or more documents. This is a document-level write operation that creates new signature artifacts.

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

POLICY

How to control signature_icp_create

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 signature_icp_create:

policy.json

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

signature_icp_create 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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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 signature_icp_create

What does the signature_icp_create tool do? +

Create an ICP-Brasil digital signature envelope for one or more documents. Returns envelope_id + signers. 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 signature_icp_create? +

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

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

Can I rate-limit signature_icp_create? +

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

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

signature_icp_create 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 →