remove_symbol · MCPEmulate MCP: Risk & Policy

WHAT IT DOES

What remove_symbol does on MCPEmulate

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

WHY IT NEEDS A POLICY

Why remove_symbol needs a policy

Removing a symbol modifies the internal state of the emulator's symbol table. This is a reversible write operation (the symbol can be re-added), confined to an isolated emulation session with no external system impact. Severity is low due to the sandboxed context.

From the tool's definition 'Remove a symbol' — modifies the symbol table within an emulation session by deleting a named entry.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

remove_symbol Rate-limited

remove_symbol 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": {
    "remove_symbol": {
      "limits": [
        {
          "counter": "remove_symbol_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 MCPEmulate, so you can run agents against it safely.

FAQ

Questions about remove_symbol

What does the remove_symbol tool do? +

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

How do I enforce a policy on remove_symbol? +

Register the MCPEmulate MCP server in PolicyLayer and add a rule for remove_symbol: 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 MCPEmulate. Nothing to install.

What risk level is remove_symbol? +

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

Can I rate-limit remove_symbol? +

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

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

remove_symbol is provided by the MCPEmulate MCP server (labguy94/mcpemulate). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.