challenge_3ds

THE RISK

High Risk

Why challenge_3ds needs a policy

This tool executes a step in the 3DS2 (3-D Secure 2) authentication flow by posting a CReq (Challenge Request) message to an external issuer system and retrieving the authentication result. It triggers an external operation with real-world effects on payment authentication state.

From the tool's definition 'post the CReq back after the issuer challenge window closes, to retrieve the final authentication outcome' — triggers an external 3DS2 authentication protocol step by posting data to an issuer's system

Documented attack patterns abuse exactly the kind of access challenge_3ds gives an agent:

POLICY

How to control challenge_3ds

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 challenge_3ds:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "challenge_3ds": {
      "limits": [
        {
          "counter": "challenge_3ds_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

challenge_3ds stays usable, but rate-capped — a runaway agent can't fire it dozens of times 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.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

High-risk tools in Mcp Afip → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about challenge_3ds

What does the challenge_3ds tool do? +

Step 3 of 3DS2 — post the CReq back after the issuer challenge window closes, to retrieve the final authentication outcome. It is categorised as a Execute tool in the Mcp Afip MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on challenge_3ds? +

Register the Mcp Afip MCP server in PolicyLayer and add a rule for challenge_3ds: 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 challenge_3ds? +

challenge_3ds is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit challenge_3ds? +

Yes. Add a rate_limit block to the challenge_3ds 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 challenge_3ds completely? +

Set action: deny in the PolicyLayer policy for challenge_3ds. 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 challenge_3ds? +

challenge_3ds 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 →