setVariable · MCP Chrome Debugger Protocol MCP

WHAT IT DOES

What setVariable does on MCP Chrome Debugger Protocol

AI agents use setVariable to create or update resources in MCP Chrome Debugger Protocol — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your MCP Chrome Debugger Protocol environment.

WHY IT NEEDS A POLICY

Why setVariable needs a policy

This tool modifies the value of a variable in a running Node.js process via the Debug Adapter Protocol. It creates or modifies data (the variable's value) in a reversible sense — while it changes runtime state, variables can generally be set again. It does not delete data, execute arbitrary code directly, or involve financial operations.

From the tool's definition Set the value of a variable (DAP standard)

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

setVariable Rate-limited

setVariable 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": {
    "setVariable": {
      "limits": [
        {
          "counter": "setvariable_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 MCP Chrome Debugger Protocol, so you can run agents against it safely.

FAQ

Questions about setVariable

What does the setVariable tool do? +

Set the value of a variable (DAP standard). It is categorised as a Write tool in the MCP Chrome Debugger Protocol MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on setVariable? +

Register the MCP Chrome Debugger Protocol MCP server in PolicyLayer and add a rule for setVariable: 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 MCP Chrome Debugger Protocol. Nothing to install.

What risk level is setVariable? +

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

Can I rate-limit setVariable? +

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

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

setVariable is provided by the MCP Chrome Debugger Protocol MCP server (vitalyostanin/mcp-chrome-debugger-protocol). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.