get_fields_of_class

THE RISK

Low Risk

Why get_fields_of_class needs a policy

This tool queries and retrieves static metadata (field names) from decompiled Java/Android code. It performs no write, destructive, execute, or financial operations. The blast radius of misuse is minimal — an AI agent can only read information that is already publicly available in the decompiled code.

From the tool's definition Tool name is 'get_fields_of_class' and description states it 'Returns all field names declared in the specified class' — a pure retrieval operation with no modification, deletion, or execution.

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

POLICY

How to control get_fields_of_class

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "get_fields_of_class": {}
  }
}

get_fields_of_class is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Jadx 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.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Jadx MCP Server tools

Read get_all_resource_file_names Returns a list of all resource file names in the APK. Params: - limit: Max number Read get_android_manifest Returns the content of AndroidManifest.xml Read get_class_source Returns the full decompiled source code of a given class. Read get_class_xrefs Returns all references to a class. Read get_field_xrefs Returns all references to a field. Read get_method_code Returns only the source code block of a specific method within a class. Read get_method_xrefs Returns all references to a method. Read get_methods_of_class Returns all method names declared in the specified class.

All 13 Jadx MCP Server tools →

Read tools on other servers

M-Team MCP Server get_torrent_detail YouTube MCP Server search_channel Android Forensics ADB MCP Server parse_browser_history 0xarchive web3_challenge

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about get_fields_of_class

What does the get_fields_of_class tool do? +

Returns all field names declared in the specified class. It is categorised as a Read tool in the Jadx MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_fields_of_class? +

Register the Jadx MCP Server MCP server in PolicyLayer and add a rule for get_fields_of_class: 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 Jadx MCP Server. Nothing to install.

What risk level is get_fields_of_class? +

get_fields_of_class is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit get_fields_of_class? +

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

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

get_fields_of_class is provided by the Jadx MCP Server MCP server (mobilehackinglab/jadx-mcp-plugin). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Jadx MCP Server tool call.

Start from Jadx 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 →