add_to_watchlist

Adds symbols to a watchlist.

SERVEROpen Stocks MCP SOURCEopen-agent-tools/open-stocks-mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/open-agent-tools-open-stocks-mcp/add-to-watchlist.md

WHAT IT DOES

What add_to_watchlist does on Open Stocks MCP

AI agents use 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.

RISK

Why add_to_watchlist is rated Medium

This tool modifies user data (watchlist contents) but does not execute trades, move money, delete data irreversibly, or run arbitrary code. The impact is limited to organizing personal market tracking preferences.

From the tool's definition Tool name 'add_to_watchlist' and description 'Adds symbols to a watchlist' indicate creation or modification of user watchlist data. This is a reversible write operation—symbols can be removed from the watchlist later.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs 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 add_to_watchlist, this is the rule to start with:

add_to_watchlist Rate-limited

add_to_watchlist 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": {
    "add_to_watchlist": {
      "limits": [
        {
          "counter": "add_to_watchlist_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Open Stocks MCP, apply this rule, and every add_to_watchlist call is checked against it from then on.

FAQ

Questions about add_to_watchlist

What does the add_to_watchlist tool do? +

Adds symbols to a watchlist. It is categorised as a Write tool in the Open Stocks MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on add_to_watchlist? +

Register the Open Stocks MCP server in PolicyLayer and add a rule for add_to_watchlist: 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 Open Stocks MCP. Nothing to install.

What risk level is add_to_watchlist? +

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

Can I rate-limit add_to_watchlist? +

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

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

add_to_watchlist is provided by the Open Stocks MCP server (open-agent-tools/open-stocks-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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