buy_stock_stop_limit

THE RISK

High Risk

Why buy_stock_stop_limit needs a policy

This tool triggers automatic execution of buy orders conditional on price thresholds being crossed. While labeled 'paper trading' (no real financial loss), the Execute category is appropriate because: (1) it runs an operation whose effects (order placement, potential automatic fills) depend on market conditions and arguments; (2) it is not mere Write (reversible data creation) since once placed and triggered, the…

From the tool's definition Tool places a 'stop-limit buy order for stocks' which executes a market operation triggering automatic conditional trades when price conditions are met. The word 'buy' and 'order' indicate this executes a financial transaction in the trading system.

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

POLICY

How to control buy_stock_stop_limit

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "buy_stock_stop_limit": {
      "limits": [
        {
          "counter": "buy_stock_stop_limit_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

buy_stock_stop_limit 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.

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

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Open Paper Trading MCP tools

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Go deeper

High-risk tools in Open Paper Trading MCP → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about buy_stock_stop_limit

What does the buy_stock_stop_limit tool do? +

Place a stop-limit buy order for stocks. It is categorised as a Execute tool in the Open Paper Trading MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on buy_stock_stop_limit? +

Register the Open Paper Trading MCP server in PolicyLayer and add a rule for buy_stock_stop_limit: 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 Paper Trading MCP. Nothing to install.

What risk level is buy_stock_stop_limit? +

buy_stock_stop_limit is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit buy_stock_stop_limit? +

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

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

buy_stock_stop_limit is provided by the Open Paper Trading MCP server (open-agent-tools/open-paper-trading-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 Paper Trading MCP tool call.

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

CHECK YOUR STACK →