Gets all watchlists aggregated across supported brokers.
AI agents call unified_watchlists to retrieve information from Open Stocks MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves watchlist data from multiple brokers without creating, modifying, deleting, or executing any financial transactions. It is purely informational and has no side effects. Even though it operates in a financial domain, the action itself is a simple data query, making it a Read operation with low severity.
From the tool's definition Tool description states 'Gets all watchlists aggregated across supported brokers' — a retrieval operation with no modification, deletion, or execution of trades. The verb 'Gets' indicates read-only data access.
Documented attack patterns abuse exactly the kind of access unified_watchlists gives an agent:
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_watchlists:
{
"version": "1",
"default": "deny",
"tools": {
"unified_watchlists": {}
}
}unified_watchlists is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Gets all watchlists aggregated across supported brokers. It is categorised as a Read tool in the Open Stocks MCP MCP Server, which means it retrieves data without modifying state.
Register the Open Stocks MCP server in PolicyLayer and add a rule for unified_watchlists: 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.
unified_watchlists is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the unified_watchlists 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.
Set action: deny in the PolicyLayer policy for unified_watchlists. 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.
unified_watchlists 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.
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.
Free to start. No card required.
152 Open Stocks MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.