add_to_watchlist

A write tool on the Ebay MCP server.

SERVEREbay SOURCEacato/ebay-mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade D, identity unverified Pull the record →

This record as markdown: /tools/acato-ebay-mcp/add-to-watchlist.md

WHAT IT DOES

What add_to_watchlist does on Ebay

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

RISK

Why add_to_watchlist is rated Medium

This tool creates/modifies user watchlist data by adding items, which is a reversible Write operation. It does not execute code, delete data irreversibly, or commit financial obligations. While the description is empty, the tool name and server context are sufficiently clear.

From the tool's definition Tool name 'add_to_watchlist' and server context describing eBay buyer workflows. The name indicates adding items to a watchlist, which is a reversible data modification operation.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs add_to_watchlist safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Ebay, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For add_to_watchlist, this is the rule to start with:

add_to_watchlist Rate-limited

add_to_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": {
    "add_to_watchlist": {
      "limits": [
        {
          "counter": "add_to_watchlist_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Ebay, apply this rule, and every add_to_watchlist call is checked against it from then on.

FAQ

Questions about add_to_watchlist

What does the add_to_watchlist tool do? +

add_to_watchlist is a write tool on the Ebay MCP server. It is categorised as a Write tool in the Ebay MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on add_to_watchlist? +

Register the Ebay MCP server in PolicyLayer and add a rule for add_to_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 Ebay. Nothing to install.

What risk level is add_to_watchlist? +

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

Can I rate-limit add_to_watchlist? +

Yes. Add a rate_limit block to the add_to_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 add_to_watchlist completely? +

Set action: deny in the PolicyLayer policy for add_to_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 add_to_watchlist? +

add_to_watchlist is provided by the Ebay MCP server (acato/ebay-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

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