alpaca-closePositions · Alpaca API MCP Server MCP

WHAT IT DOES

What alpaca-closePositions does on Alpaca API MCP Server

AI agents use alpaca-closePositions to create or update resources in Alpaca API MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Alpaca API MCP Server environment.

WHY IT NEEDS A POLICY

Why alpaca-closePositions needs a policy

An AI agent can call alpaca-closePositions faster than any human can review — one bad instruction and it creates or modifies resources in Alpaca API MCP Server by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

alpaca-closePositions Rate-limited

alpaca-closePositions 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "alpaca-closePositions": {
      "limits": [
        {
          "counter": "alpaca-closepositions_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Alpaca API MCP Server, so you can run agents against it safely.

FAQ

Questions about alpaca-closePositions

What does the alpaca-closePositions tool do? +

alpaca-closePositions. It is categorised as a Write tool in the Alpaca API MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on alpaca-closePositions? +

Register the Alpaca API MCP Server MCP server in PolicyLayer and add a rule for alpaca-closePositions: 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 Alpaca API MCP Server. Nothing to install.

What risk level is alpaca-closePositions? +

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

Can I rate-limit alpaca-closePositions? +

Yes. Add a rate_limit block to the alpaca-closePositions 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 alpaca-closePositions completely? +

Set action: deny in the PolicyLayer policy for alpaca-closePositions. 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 alpaca-closePositions? +

alpaca-closePositions is provided by the Alpaca API MCP Server MCP server (wlu03/alpaca-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.