update_watchlist

What update_watchlist does on Alpaca MCP Server

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

Why update_watchlist is rated Medium

This tool modifies data (a watchlist) but does not involve financial transactions, execute arbitrary code, or irreversibly destroy data. While the server context involves financial trading, this specific tool only updates a user's watch list—a benign organizational feature. The blast radius of misuse is limited to unauthorized changes to the user's watchlist preferences, with no financial or operational impact.

From the tool's definition Tool name 'update_watchlist' and description 'Update an existing watchlist' indicates modification of watchlist data, which is a reversible write operation. Watchlists are non-financial metadata used for organizing securities of interest.

The rule that runs update_watchlist safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Alpaca MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For update_watchlist, this is the rule to start with:

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

Questions about update_watchlist