modify_struct_field

THE RISK

Medium Risk

Why modify_struct_field needs a policy

The tool modifies analysis metadata (field names, types, comments) in Ghidra's internal structure definitions. These changes are reversible (can be renamed again or reverted), affect analysis results rather than the binary itself, and do not involve code execution or destructive operations. This is a Write operation because it alters structured data artifacts created during reverse engineering analysis.

From the tool's definition Tool description states it can 'Modify a field in an existing structure (change name, type, or comment)' — this creates or modifies metadata and analysis artifacts reversibly without deleting underlying data.

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

POLICY

How to control modify_struct_field

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 modify_struct_field:

policy.json

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

modify_struct_field 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

Related tools and policies

More Kawaiidra MCP tools

Destructive cache_clear Clear cached analysis results. Can clear all cache or filter by binary/project. Destructive clear_comments Clear all comments (EOL, PRE, POST, PLATE) within a function Destructive delete_data_type Delete a user-defined data type from the binary. Destructive delete_function Delete a function by address or name. Removes the function definition but not the underlyi Destructive delete_label Delete a label/symbol at a specific address. Destructive remove_struct_field Remove a field from a structure by index. Execute run_script Execute arbitrary Jython code in the Ghidra scripting environment. Has access to currentPr Execute analyze_binary Import and analyze a binary file with Ghidra. Supports PE, ELF, Mach-O, and raw formats.

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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 modify_struct_field

What does the modify_struct_field tool do? +

Modify a field in an existing structure (change name, type, or comment). 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 modify_struct_field? +

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

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

Can I rate-limit modify_struct_field? +

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

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

modify_struct_field 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 →