# add_to_watchlist

A write tool on the Ebay MCP server.

Agent View of the PolicyLayer registry record for `add_to_watchlist`. HTML page: https://policylayer.com/tools/acato-ebay-mcp/add-to-watchlist

## Facts

- Tool: `add_to_watchlist`
- Server: Ebay (`acato/ebay-mcp`) — https://policylayer.com/tools/acato-ebay-mcp.md
- Homepage: https://github.com/acato/ebay-mcp
- Risk category: Write (Medium risk)
- Registry record: grade D, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Rate-limited

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "add_to_watchlist",
    "arguments": {}
  }
}
```

## 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 own 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."

## Use case

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.

## Recommended policy (PolicyLayer)

Verdict: **Rate-limited**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Ebay:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "add_to_watchlist": {
      "limits": [
        {
          "counter": "add_to_watchlist_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}
```

## Other tools on Ebay (14)

- `start_user_auth` — Execute — https://policylayer.com/tools/acato-ebay-mcp/start-user-auth.md
- `buy_now` — Financial — https://policylayer.com/tools/acato-ebay-mcp/buy-now.md
- `make_best_offer` — Financial — https://policylayer.com/tools/acato-ebay-mcp/make-best-offer.md
- `place_bid` — Financial — https://policylayer.com/tools/acato-ebay-mcp/place-bid.md
- `get_active_bids` — Read — https://policylayer.com/tools/acato-ebay-mcp/get-active-bids.md
- `get_item` — Read — https://policylayer.com/tools/acato-ebay-mcp/get-item.md
- `get_lost_items` — Read — https://policylayer.com/tools/acato-ebay-mcp/get-lost-items.md
- `get_watchlist` — Read — https://policylayer.com/tools/acato-ebay-mcp/get-watchlist.md
- `get_won_items` — Read — https://policylayer.com/tools/acato-ebay-mcp/get-won-items.md
- `list_hosts` — Read — https://policylayer.com/tools/acato-ebay-mcp/list-hosts.md
- `search` — Read — https://policylayer.com/tools/acato-ebay-mcp/search.md
- `server_info` — Read — https://policylayer.com/tools/acato-ebay-mcp/server-info.md
- `complete_user_auth` — Write — https://policylayer.com/tools/acato-ebay-mcp/complete-user-auth.md
- `remove_from_watchlist` — Write — https://policylayer.com/tools/acato-ebay-mcp/remove-from-watchlist.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=acato-ebay-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/acato-ebay-mcp