verify_notification

THE RISK

Low Risk

Why verify_notification needs a policy

This tool only reads and validates cryptographic signatures locally without modifying any state, creating obligations, executing arbitrary operations, or destroying data. It is a pure verification check that retrieves no sensitive information and produces no side effects, making it a Read operation with low severity risk.

From the tool's definition The tool performs 'Local verification' with 'no API call', checking and validating a webhook notification signature against an integration key. This is a validation/verification operation with no data modification, deletion, or side effects.

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

POLICY

How to control verify_notification

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 verify_notification:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "verify_notification": {}
  }
}

verify_notification is read-only, so it stays allowed — but 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.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
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Rate Limiting MCP Tool Calls: A Practical Guide →
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FAQ

Questions about verify_notification

What does the verify_notification tool do? +

Verify an EBANX webhook notification HMAC signature against the integration key. Local verification, no API call. It is categorised as a Read tool in the Mcp Afip MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on verify_notification? +

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

verify_notification is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit verify_notification? +

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

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

verify_notification 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 →