add_parameter · Ast Editor MCP: Risk & Policy

WHAT IT DOES

What add_parameter does on Ast Editor

AI agents use add_parameter to create or update resources in Ast Editor — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Ast Editor environment.

WHY IT NEEDS A POLICY

Why add_parameter needs a policy

Adding a parameter to a function/method modifies code structure reversibly (it can be removed or edited later). This is a Write operation—it creates or modifies code without deleting it irreversibly. High severity because injecting incorrect or malicious parameters could alter function signatures, introduce type errors, or change behavior in unexpected ways.

From the tool's definition Tool name is 'add_parameter' with empty description. Sibling tools include 'add_field', 'add_method', 'add_import', 'add_key', 'delete_symbol', etc., confirming this server performs structural code modifications.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_parameter Rate-limited

add_parameter 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.

View as policy code

policy.json

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

LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about add_parameter

What does the add_parameter tool do? +

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

How do I enforce a policy on add_parameter? +

Register the Ast Editor MCP server in PolicyLayer and add a rule for add_parameter: 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 Ast Editor. Nothing to install.

What risk level is add_parameter? +

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

Can I rate-limit add_parameter? +

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

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

add_parameter is provided by the Ast Editor MCP server (kambleakash0/ast-editor). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.