watch_add · Stock MCP Server MCP: Risk & Policy

WHAT IT DOES

What watch_add does on Stock MCP Server

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

WHY IT NEEDS A POLICY

Why watch_add needs a policy

This tool adds a stock to a watchlist, which is a reversible write operation. It creates new data (a watchlist entry) but does not execute trades, move money, or irreversibly destroy data. Misuse has minimal blast radius as it only affects a personal watchlist.

From the tool's definition watch_add — 添加观察股票 (Add a stock to the watchlist)

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

watch_add Rate-limited

watch_add 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": {
    "watch_add": {
      "limits": [
        {
          "counter": "watch_add_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 Stock MCP Server, so you can run agents against it safely.

FAQ

Questions about watch_add

What does the watch_add tool do? +

添加观察股票. It is categorised as a Write tool in the Stock 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 watch_add? +

Register the Stock MCP Server MCP server in PolicyLayer and add a rule for watch_add: 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 Stock MCP Server. Nothing to install.

What risk level is watch_add? +

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

Can I rate-limit watch_add? +

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

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

watch_add is provided by the Stock MCP Server MCP server (kinmeic/stock-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.