unified_remove_from_watchlist

THE RISK

Medium Risk

Why unified_remove_from_watchlist needs a policy

Removing symbols from a watchlist is a reversible modification of user preferences/lists (the symbols can be re-added). It does not delete financial data, execute trades, or move money. It is a Write operation with low blast radius since watchlists are non-critical metadata.

From the tool's definition Removes symbols from a watchlist across supported brokers

Documented attack patterns abuse exactly the kind of access unified_remove_from_watchlist gives an agent:

POLICY

How to control unified_remove_from_watchlist

PolicyLayer is an MCP gateway — it sits between your AI agents and Open Stocks MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for unified_remove_from_watchlist:

policy.json

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

unified_remove_from_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.

Create a free account and register Open Stocks MCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

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All 152 Open Stocks MCP tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about unified_remove_from_watchlist

What does the unified_remove_from_watchlist tool do? +

Removes symbols from a watchlist across supported brokers. 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 unified_remove_from_watchlist? +

Register the Open Stocks MCP server in PolicyLayer and add a rule for unified_remove_from_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 unified_remove_from_watchlist? +

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

Can I rate-limit unified_remove_from_watchlist? +

Yes. Add a rate_limit block to the unified_remove_from_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 unified_remove_from_watchlist completely? +

Set action: deny in the PolicyLayer policy for unified_remove_from_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 unified_remove_from_watchlist? +

unified_remove_from_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.

Enforce policy on every Open Stocks MCP tool call.

Start from Open Stocks MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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