get_seller_balance

THE RISK

Low Risk

Why get_seller_balance needs a policy

This tool retrieves financial data (seller balance) but does not move money, create obligations, or modify account state. It is a read-only query operation. While the context involves payments (AP2 protocol), the tool itself only accesses information. Severity is low because unauthorized access to balance data has limited direct impact compared to tools that execute transfers or modifications.

From the tool's definition Tool name 'get_seller_balance' and description 'Get detailed balance for a specific seller' indicate a retrieval operation that queries balance information without modifying state.

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

POLICY

How to control get_seller_balance

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 get_seller_balance:

policy.json

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

get_seller_balance is read-only, so it stays allowed — but 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.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Mcp Ap2 tools

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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.
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 get_seller_balance

What does the get_seller_balance tool do? +

Get detailed balance for a specific seller. 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 get_seller_balance? +

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

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

Can I rate-limit get_seller_balance? +

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

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

get_seller_balance 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.

Start from Mcp Ap2, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →