oauth_token_exchange

THE RISK

Medium Risk

Why oauth_token_exchange needs a policy

This tool exchanges an authorization code for an access token, which creates/issues a new credential (access token) on behalf of a seller. This is a Write operation as it creates a new token resource.

From the tool's definition Exchange an authorization code for a seller access token (marketplace onboarding). Also supports refresh_token grant.

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

POLICY

How to control oauth_token_exchange

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 oauth_token_exchange:

policy.json

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

oauth_token_exchange 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.

LIMIT THIS TOOL →

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EXPLORE

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Write tools on other servers

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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 oauth_token_exchange

What does the oauth_token_exchange tool do? +

Exchange an authorization code for a seller access token (marketplace onboarding). Also supports refresh_token grant. 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 oauth_token_exchange? +

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

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

Can I rate-limit oauth_token_exchange? +

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

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

oauth_token_exchange 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.

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

CHECK YOUR STACK →