call_rfc_function

THE RISK

High Risk

Why call_rfc_function needs a policy

This tool permits execution of arbitrary RFC (Remote Function Call) functions in SAP systems with user-provided parameters. RFC functions in SAP can perform a wide range of operations—from data retrieval to financial transactions to system configuration changes—depending on what the caller specifies.

From the tool's definition Tool name 'call_rfc_function' combined with description 'Execute an arbitrary RFC function with parameters' explicitly indicates execution of arbitrary remote functions with caller-supplied parameters.

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

POLICY

How to control call_rfc_function

PolicyLayer is an MCP gateway — it sits between your AI agents and SAP RFC MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for call_rfc_function:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "call_rfc_function": {
      "limits": [
        {
          "counter": "call_rfc_function_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

call_rfc_function stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register SAP RFC MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More SAP RFC MCP Server tools

Read bulk_load_metadata Bulk load metadata for multiple RFC functions Read get_function_metadata Get comprehensive metadata for an RFC function including parameters, types, and descriptio Read get_metadata_cache_stats Get statistics about the RFC metadata cache Read get_rfc_functions Query available RFC functions with optional filtering Read get_system_info Get basic SAP system information using RFC_SYSTEM_INFO Read get_table_structure Get the structure/metadata of an SAP table using DDIF_FIELDINFO_GET Read ping_connection Test SAP connection status and return basic connectivity info Read read_table Read data from SAP table with automatic buffer overflow protection

All 15 SAP RFC MCP Server tools →

Execute tools on other servers

Android Forensics ADB MCP Server adb_shell_command EMBA-MCP run_emba_scan Frida Game Hacking MCP remove_breakpoint Procmon request_elevation

Go deeper

High-risk tools in SAP RFC MCP Server → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about call_rfc_function

What does the call_rfc_function tool do? +

Execute an arbitrary RFC function with parameters. It is categorised as a Execute tool in the SAP RFC MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on call_rfc_function? +

Register the SAP RFC MCP Server MCP server in PolicyLayer and add a rule for call_rfc_function: 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 SAP RFC MCP Server. Nothing to install.

What risk level is call_rfc_function? +

call_rfc_function is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit call_rfc_function? +

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

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

call_rfc_function is provided by the SAP RFC MCP Server MCP server (thupalo/sap-rfc-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every SAP RFC MCP Server tool call.

Start from SAP RFC MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →