search_masterdata

THE RISK

Low Risk

Why search_masterdata needs a policy

This tool retrieves or queries data from a Master Data entity without creating, modifying, or deleting any information. It is a read operation with no side effects on the system. The low severity reflects that searching documents alone does not pose significant risk unless the master data contains highly sensitive information, but the operation itself is non-destructive and reversible.

From the tool's definition Tool is named 'search_masterdata' with description 'Search documents in a Master Data entity'. The verb 'search' and the action of querying/retrieving documents from a database entity are characteristic of read-only operations with no modification or side…

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

POLICY

How to control search_masterdata

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 search_masterdata:

policy.json

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

search_masterdata 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 Afip — 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 →

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EXPLORE

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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 search_masterdata

What does the search_masterdata tool do? +

Search documents in a Master Data entity. It is categorised as a Read tool in the Mcp Afip MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on search_masterdata? +

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

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

Can I rate-limit search_masterdata? +

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

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

search_masterdata 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 →