unified_add_to_watchlist

What unified_add_to_watchlist does on Open Stocks MCP

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

Why unified_add_to_watchlist is rated Medium

This tool modifies user watchlist data (a form of personal preference/metadata), which is a reversible Write operation. It does not execute trades (Execute category), delete data (Destructive), move money (Financial), or trigger external code execution. The severity is low because modifying a watchlist has minimal blast radius—an erroneous addition harms only the user's own preferences and can be easily undone.

From the tool's definition The tool name and description indicate it "Adds symbols to a watchlist" - a write operation that creates or modifies watchlist data reversibly. Watchlists are metadata/preferences that track user interest in securities without executing trades or moving money.

The rule that runs unified_add_to_watchlist safely

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

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

Questions about unified_add_to_watchlist