Complete a 3-D Secure challenge. Call after the payer finishes the issuer challenge (redirected back to return_url) with the authenticator response (cres / PaRes). Returns the authenticated charge state so capture or authorization can proceed.
AI agents invoke authenticate_3ds to trigger actions in Mcp Afip. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
This tool completes a 3DS authentication flow that enables a payment charge to be captured or authorized. While it doesn't directly move money, it finalizes authentication that immediately enables financial transactions to proceed. It triggers an external operation (authentication verification with card issuer) whose result directly gates financial actions, placing it in Execute.
From the tool's definition Complete a 3-D Secure challenge... Returns the authenticated charge state so capture or authorization can proceed.
Documented attack patterns abuse exactly the kind of access authenticate_3ds gives an agent:
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 authenticate_3ds:
{
"version": "1",
"default": "deny",
"tools": {
"authenticate_3ds": {
"limits": [
{
"counter": "authenticate_3ds_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}authenticate_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.
Free to start. No card required.
Complete a 3-D Secure challenge. Call after the payer finishes the issuer challenge (redirected back to return_url) with the authenticator response (cres / PaRes). Returns the authenticated charge state so capture or authorization can proceed. 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.
Register the Mcp Afip MCP server in PolicyLayer and add a rule for authenticate_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.
authenticate_3ds is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the authenticate_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.
Set action: deny in the PolicyLayer policy for authenticate_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.
authenticate_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.
Start from Mcp Afip, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
1300 Mcp Afip tools catalogued and risk-classified — across an index of 43,000+ MCP servers.