get_marketplace_participations

ServerMcp Ap2
CategoryRead

How to control get_marketplace_participations ↓

WHAT IT DOES

What get_marketplace_participations does on Mcp Ap2

AI agents call get_marketplace_participations 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 get_marketplace_participations needs a policy

This is a read-only operation that retrieves seller marketplace registration data. The tool queries existing information without creating, modifying, deleting, or executing any external operations. The word 'List' and 'Returns' indicate retrieval semantics. While it exists in a financial/payment context (AP2), the tool itself performs no financial transactions, payments, or irreversible actions.

From the tool's definition Tool returns marketplace information (ids, names, currency, language, status) without modifying data. Described as 'List all marketplaces' and 'discover which marketplaces the authorized seller can transact in' — a query operation with no side effects.

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

POLICY

How to control get_marketplace_participations

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_marketplace_participations:

policy.json

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

get_marketplace_participations 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.

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EXPLORE

Related tools and policies

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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_marketplace_participations

What does the get_marketplace_participations tool do? +

List all marketplaces the seller is registered to sell in (Sellers API). Returns marketplace ids, names, default currency/language, and participation status. Use this to discover which marketplaces the authorized seller can transact in. 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_marketplace_participations? +

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

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

Can I rate-limit get_marketplace_participations? +

Yes. Add a rate_limit block to the get_marketplace_participations 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_marketplace_participations completely? +

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

get_marketplace_participations 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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