call_function · GTAV-CLAUDE- MCP: Risk & Policy

WHAT IT DOES

What call_function does on GTAV-CLAUDE-MCP

AI agents invoke call_function to trigger actions in GTAV-CLAUDE-MCP. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why call_function needs a policy

Given the server context (GTA V mod with native calls and memory read/write), 'call_function' almost certainly executes arbitrary game functions or memory-level calls. The description is empty, lowering confidence, but the sibling tools and server description strongly imply Execute or worse (memory writes can be destructive).

From the tool's definition Tool name 'call_function' on a server that 'calls game natives, and reading/writing memory' — sibling tools include 'call_native', 'call_native_by_hash', and memory operations

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

call_function Rate-limited

call_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.

View as policy code

policy.json

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

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches GTAV-CLAUDE-MCP, so you can run agents against it safely.

FAQ

Questions about call_function

What does the call_function tool do? +

call_function. It is categorised as a Execute tool in the GTAV-CLAUDE-MCP 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_function? +

Register the GTAV-CLAUDE- MCP server in PolicyLayer and add a rule for call_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 GTAV-CLAUDE-MCP. Nothing to install.

What risk level is call_function? +

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

Can I rate-limit call_function? +

Yes. Add a rate_limit block to the call_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_function completely? +

Set action: deny in the PolicyLayer policy for call_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_function? +

call_function is provided by the GTAV-CLAUDE- MCP server (tabbedscamper/gtav-claude-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.