apply_decision_to_user

Apply a workflow Decision to a user (POST /v3/accounts/{account_id}/users/{user_id}/decisions). Decisions are the modern replacement for Labels — they both classify the entity for Sift

ServerMcp Afip
CategoryWrite

How to control apply_decision_to_user ↓

WHAT IT DOES

What apply_decision_to_user does on Mcp Afip

AI agents use apply_decision_to_user to create or update resources in Mcp Afip — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mcp Afip environment.

THE RISK

Medium Risk

Why apply_decision_to_user needs a policy

The tool uses POST (create/modify operation) to attach or update a classification (Decision) on a user record. This is Write-category because it modifies user metadata reversibly. While in a fraud/risk context, 'decisions' may influence downstream actions, the tool itself only persists classification data—no deletion, financial transaction, or code execution occurs.

From the tool's definition Tool applies a 'workflow Decision' to a user via POST endpoint; description states decisions 'classify the entity', modifying user attributes/metadata. POST and the action of applying classifications constitute reversible data modification.

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

POLICY

How to control apply_decision_to_user

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 apply_decision_to_user:

policy.json

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

apply_decision_to_user 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.

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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.
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 →
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FAQ

Questions about apply_decision_to_user

What does the apply_decision_to_user tool do? +

Apply a workflow Decision to a user (POST /v3/accounts/{account_id}/users/{user_id}/decisions). Decisions are the modern replacement for Labels — they both classify the entity for Sift. 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 apply_decision_to_user? +

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

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

Can I rate-limit apply_decision_to_user? +

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

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

apply_decision_to_user 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.

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