verify_account

Run an AVS/CVC account verification on a card without charging it. Returns the verification outcome and a card-on-file or one-time verification record. merchant.entity is injected automatically.

ServerMcp Ap2
CategoryRead

How to control verify_account ↓

WHAT IT DOES

What verify_account does on Mcp Ap2

AI agents call verify_account to retrieve information from Mcp Ap2 without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

THE RISK

Low Risk

Why verify_account needs a policy

This tool performs query-based verification of payment card credentials without executing any charges, transfers, or modifications to accounts or data. It retrieves verification outcomes but does not create, modify, delete, or move money. The automatic injection of merchant.entity does not change the fundamental read-only nature of the operation.

From the tool's definition The tool description explicitly states it 'Run[s] an AVS/CVC account verification on a card without charging it' and 'Returns the verification outcome and a card-on-file or one-time verification record.' The key phrase 'without charging it' confirms no…

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

POLICY

How to control verify_account

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 verify_account:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "verify_account": {}
  }
}

verify_account is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

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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

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about verify_account

What does the verify_account tool do? +

Run an AVS/CVC account verification on a card without charging it. Returns the verification outcome and a card-on-file or one-time verification record. merchant.entity is injected automatically. It is categorised as a Read tool in the Mcp Ap2 MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on verify_account? +

Register the Mcp Ap2 MCP server in PolicyLayer and add a rule for verify_account: 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 verify_account? +

verify_account is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit verify_account? +

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

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

verify_account 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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