set_function_prototype

THE RISK

Medium Risk

Why set_function_prototype needs a policy

This tool modifies function prototype metadata within a Ghidra project—specifically defining or altering how a function is declared, typed, or annotated. This is a reversible write operation: the prototype can be changed again or reverted. It does not execute code, delete data irreversibly, or move funds.

From the tool's definition Tool name 'set_function_prototype' indicates it modifies function prototypes in a Ghidra binary analysis project.

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

POLICY

How to control set_function_prototype

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

policy.json

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

set_function_prototype 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 Kawaiidra MCP — 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 →

Free to start. No card required.

EXPLORE

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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 set_function_prototype

What does the set_function_prototype tool do? +

Set a function. It is categorised as a Write tool in the Kawaiidra MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on set_function_prototype? +

Register the Kawaiidra MCP server in PolicyLayer and add a rule for set_function_prototype: 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 Kawaiidra MCP. Nothing to install.

What risk level is set_function_prototype? +

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

Can I rate-limit set_function_prototype? +

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

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

set_function_prototype is provided by the Kawaiidra MCP server (wagonbomb/kawaiidra-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Kawaiidra MCP tool call.

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

CHECK YOUR STACK →