update_pie · Trading 212 MCP Server MCP: Risk & Policy

WHAT IT DOES

What update_pie does on Trading 212 MCP Server

AI agents use update_pie to create or update resources in Trading 212 MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Trading 212 MCP Server environment.

WHY IT NEEDS A POLICY

Why update_pie needs a policy

This tool creates or modifies portfolio data (a pie) reversibly through an update operation. It does not execute arbitrary trades, delete data irreversibly, or move money directly—those would be Execute, Destructive, or Financial respectively.

From the tool's definition Tool name 'update_pie' and description 'Update a specific pie by ID' indicate modification of existing data. In the Trading 212 context, pies are investment portfolios, so updating one modifies portfolio composition and allocation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_pie Rate-limited

update_pie 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": {
    "update_pie": {
      "limits": [
        {
          "counter": "update_pie_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 Trading 212 MCP Server, so you can run agents against it safely.

FAQ

Questions about update_pie

What does the update_pie tool do? +

Update a specific pie by ID. It is categorised as a Write tool in the Trading 212 MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on update_pie? +

Register the Trading 212 MCP Server MCP server in PolicyLayer and add a rule for update_pie: 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 Trading 212 MCP Server. Nothing to install.

What risk level is update_pie? +

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

Can I rate-limit update_pie? +

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

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

update_pie is provided by the Trading 212 MCP Server MCP server (razeevascx/212mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.