Screen stocks based on technical, fundamental, options, and news criteria
AI agents invoke run_stock_screen to trigger actions in StockScreen MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
This tool executes a screening operation whose results and side effects depend entirely on the arguments provided (screening criteria). While it reads financial data and does not modify or delete information, it runs computational/query logic against external systems.
From the tool's definition Tool name 'run_stock_screen' and description indicating it 'Screen[s] stocks based on technical, fundamental, options, and news criteria' demonstrates execution of complex screening logic with configurable parameters.
Documented attack patterns abuse exactly the kind of access run_stock_screen gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and StockScreen MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for run_stock_screen:
{
"version": "1",
"default": "deny",
"tools": {
"run_stock_screen": {
"limits": [
{
"counter": "run_stock_screen_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}run_stock_screen stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.
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Screen stocks based on technical, fundamental, options, and news criteria. It is categorised as a Execute tool in the StockScreen MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the StockScreen MCP Server MCP server in PolicyLayer and add a rule for run_stock_screen: 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 StockScreen MCP Server. Nothing to install.
run_stock_screen is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the run_stock_screen 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 run_stock_screen. 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.
run_stock_screen is provided by the StockScreen MCP Server MCP server (twolven/mcp-stockscreen). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 4 StockScreen MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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4 StockScreen MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.