// MCP TOOL REFERENCE

create_zero_auth

ServerMcp Afip
CategoryExecute

WHAT IT DOES

What create_zero_auth does on Mcp Afip

AI agents invoke create_zero_auth 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.

THE RISK

High Risk

Why create_zero_auth needs a policy

This tool triggers an external operation against a payment acquirer network (a $0 authorization request). It does not move money or commit financial obligations (no funds committed), but it does execute a real transaction attempt on the card network with external side effects.

From the tool's definition Zero-dollar authorization / card validation (POST /zeroauth). Braspag routes a $0 (or minimum-amount) authorization through the acquirer to confirm the card is live and not blocked, without committing funds.

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

POLICY

How to control create_zero_auth

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 create_zero_auth:

policy.json

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

create_zero_auth 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

Related tools and policies

More Mcp Afip tools

Financial authorize_transaction Authorize a transaction (reserve funds without capturing) via Braintree GraphQL authorizeP Financial cancel_collection Cancel a scheduled collection request Financial cancel_credit Cancel an authorized-but-uncaptured credit payment. Financial cancel_payment Attempt to cancel a payment that has not yet settled. Iniciador endpoint: POST /payments/{ Financial cancel_payment_intent Cancel a payment intent that has not yet been captured. Fails on already-captured intents; Financial cancel_recurrence Cancel an active recurrence. Future charges will stop; already-charged cycles are untouche Financial cancel_subscription Cancel a subscription by ID Financial revoke_token Revoke an issued access_token or refresh_token at POST /v1/token/revoke. Use to terminate

All 1300 Mcp Afip tools →

Execute tools on other servers

Android Forensics ADB MCP Server adb_shell_command EMBA-MCP run_emba_scan Frida Game Hacking MCP remove_breakpoint Procmon request_elevation

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 create_zero_auth

What does the create_zero_auth tool do? +

Zero-dollar authorization / card validation (POST /zeroauth). Braspag routes a $0 (or minimum-amount) authorization through the acquirer to confirm the card is live and not blocked, without committing funds. Returns Valid=true/false plus ReturnCode/ReturnMessage. Useful before saving a card-on-file for future recurrence. 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 create_zero_auth? +

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

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

Can I rate-limit create_zero_auth? +

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

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

create_zero_auth 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 →

Free to start. No card required.

1300 Mcp Afip tools catalogued and risk-classified — across an index of 43,000+ MCP servers.