set_local_variable_type

THE RISK

Medium Risk

Why set_local_variable_type needs a policy

This tool modifies analysis state (local variable type metadata) reversibly within the Ghidra project. It does not delete data (not Destructive), execute arbitrary code (not Execute), or move money (not Financial). While it operates within a reverse-engineering context, the action itself is a write operation that changes type information.

From the tool's definition Tool name 'set_local_variable_type' and description 'Set the type of a local variable within a function' indicate modification of analysis metadata (variable type annotations) within Ghidra's binary analysis database.

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

POLICY

How to control set_local_variable_type

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_local_variable_type:

policy.json

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

set_local_variable_type 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.

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EXPLORE

Related tools and policies

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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_local_variable_type

What does the set_local_variable_type tool do? +

Set the type of a local variable within 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_local_variable_type? +

Register the Kawaiidra MCP server in PolicyLayer and add a rule for set_local_variable_type: 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_local_variable_type? +

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

Can I rate-limit set_local_variable_type? +

Yes. Add a rate_limit block to the set_local_variable_type 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_local_variable_type completely? +

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

set_local_variable_type 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.

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