krx_watchlist · Krx Cli MCP: Risk & Policy

WHAT IT DOES

What krx_watchlist does on Krx Cli

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

WHY IT NEEDS A POLICY

Why krx_watchlist needs a policy

The tool creates and modifies a persistent local file (watchlist.json). The 'add' action writes new entries and 'remove' deletes entries from the watchlist. While 'remove' could be considered destructive, the data is a user-managed watchlist (not financial records or irreplaceable data), and the overall tool is primarily a read/write manager. The most severe applicable category is Write.

From the tool's definition 'Manage a persistent watchlist of stocks' with actions 'add' and 'remove' that modify a locally stored file at ~/.krx-cli/watchlist.json

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

krx_watchlist Rate-limited

krx_watchlist 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": {
    "krx_watchlist": {
      "limits": [
        {
          "counter": "krx_watchlist_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 Krx Cli, so you can run agents against it safely.

FAQ

Questions about krx_watchlist

What does the krx_watchlist tool do? +

Manage a persistent watchlist of stocks. Actions: - add: Search by name and add to watchlist - remove: Remove by name or stock code (exact match) - list: Show all watchlist entries - show: Fetch current prices for all watchlist stocks The watchlist is stored locally at ~/.krx-cli/watchlist.json. It is categorised as a Write tool in the Krx Cli MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on krx_watchlist? +

Register the Krx Cli MCP server in PolicyLayer and add a rule for krx_watchlist: 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 Krx Cli. Nothing to install.

What risk level is krx_watchlist? +

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

Can I rate-limit krx_watchlist? +

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

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

krx_watchlist is provided by the Krx Cli MCP server (kyo504/krx-cli). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.