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 Ap2
CategoryWrite

How to control apply_decision_to_user ↓

WHAT IT DOES

What apply_decision_to_user does on Mcp Ap2

AI agents use apply_decision_to_user to create or update resources in Mcp Ap2 — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mcp Ap2 environment.

THE RISK

Medium Risk

Why apply_decision_to_user needs a policy

This tool creates or modifies user classifications/decisions in a payment system context (reversible write operation). While it affects fraud-detection and user classification metadata in a financial system, the action itself is reversible and does not move funds or delete data, ruling out Financial and Destructive categories.

From the tool's definition Tool description specifies 'Apply a workflow Decision to a user' with POST method, indicating modification of user entity classification/metadata.

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 Ap2, 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 Ap2 — 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

Related tools and policies

More Mcp Ap2 tools

Financial authorize_transaction Authorize a transaction (reserve funds without capturing) via Braintree GraphQL authorizeP Financial block_card Block a card temporarily (reversible). Use for lost-card or fraud-suspected flows. Card st Financial cancel_bill Cancel a pending bill Financial cancel_collection Cancel a scheduled collection request Financial cancel_credit Cancel an authorized-but-uncaptured credit payment. Financial cancel_debit Cancel a debit-card payment by Getnet payment_id. Financial cancel_invoice Cancel/void an authorized invoice (FECancel — limited to certain types/conditions) Financial cancel_order Cancel an order, optionally restocking and refunding

All 1300 Mcp Ap2 tools →

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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 →
MCP Security: Why Prompt Guardrails Aren't Enough →

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 Ap2 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 Ap2 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 Ap2. 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 Ap2 MCP server (@codespar/mcp-ap2). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Mcp Ap2 tool call.

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1300 Mcp Ap2 tools catalogued and risk-classified — across an index of 43,000+ MCP servers.