top_movers_sp500

Gets top S&P 500 movers for the day.

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

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/open-agent-tools-open-stocks-mcp/top-movers-sp500.md

WHAT IT DOES

What top_movers_sp500 does on Open Stocks MCP

AI agents call top_movers_sp500 to retrieve information from Open Stocks MCP without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why top_movers_sp500 is rated Low

This tool retrieves historical market data about S&P 500 price movements. It has no side effects, does not modify account state, does not execute trades, and does not commit financial transactions. It is a read-only query of public market information.

From the tool's definition Tool name 'top_movers_sp500' and description 'Gets top S&P 500 movers for the day' indicate data retrieval with no modification, deletion, or execution of trades. The action is purely informational—querying market data.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs top_movers_sp500 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 top_movers_sp500, this is the rule to start with:

top_movers_sp500 Allowed

top_movers_sp500 is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "top_movers_sp500": {}
  }
}

ALLOW ONLY 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 top_movers_sp500 call is checked against it from then on.

FAQ

Questions about top_movers_sp500

What does the top_movers_sp500 tool do? +

Gets top S&P 500 movers for the day. It is categorised as a Read tool in the Open Stocks MCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on top_movers_sp500? +

Register the Open Stocks MCP server in PolicyLayer and add a rule for top_movers_sp500: 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 top_movers_sp500? +

top_movers_sp500 is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit top_movers_sp500? +

Yes. Add a rate_limit block to the top_movers_sp500 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 top_movers_sp500 completely? +

Set action: deny in the PolicyLayer policy for top_movers_sp500. 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 top_movers_sp500? +

top_movers_sp500 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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