# update_watchlist

Update or reorder a watchlist.

Agent View of the PolicyLayer registry record for `update_watchlist`. HTML page: https://policylayer.com/tools/robinhood-agentic-trading/update-watchlist

## Facts

- Tool: `update_watchlist`
- Server: Robinhood Agentic Trading (`https://agent.robinhood.com/mcp/trading`) — https://policylayer.com/tools/robinhood-agentic-trading.md
- Homepage: https://github.com/https://agent.robinhood.com/mcp/trading
- Risk category: Write (Medium risk)
- Registry record: grade D, identity verified
- Server auth posture: gated
- Server CORS policy: *
- Server rate-limited: no
- Parameters: 2 (1 required)
- Recommended policy verdict: Rate-limited

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `symbols` | array | no |  |
| `watchlist` | string | yes |  |

Parameters from the server's own tool schema.

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

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "update_watchlist",
    "arguments": {
      "watchlist": "<watchlist>"
    }
  }
}
```

## Why update_watchlist is rated Medium

This tool creates or modifies data reversibly—it updates watchlist contents without deleting or causing irreversible financial transactions. While it touches financial accounts (Robinhood), watchlist modifications do not directly move money or execute trades, so Financial does not apply.

From the tool's own definition: "The tool description states it 'Update[s] or reorder[s] a watchlist,' which modifies existing data (watchlist contents/order) in a reversible manner."

Risk signals: Modifies account watchlists

## Use case

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

## Recommended policy (PolicyLayer)

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

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

## Other tools on Robinhood Agentic Trading (11)

- `cancel_equity_order` — Destructive — https://policylayer.com/tools/robinhood-agentic-trading/cancel-equity-order.md
- `place_equity_order` — Financial — https://policylayer.com/tools/robinhood-agentic-trading/place-equity-order.md
- `get_accounts` — Read — https://policylayer.com/tools/robinhood-agentic-trading/get-accounts.md
- `get_equity_orders` — Read — https://policylayer.com/tools/robinhood-agentic-trading/get-equity-orders.md
- `get_equity_positions` — Read — https://policylayer.com/tools/robinhood-agentic-trading/get-equity-positions.md
- `get_equity_quotes` — Read — https://policylayer.com/tools/robinhood-agentic-trading/get-equity-quotes.md
- `get_portfolio` — Read — https://policylayer.com/tools/robinhood-agentic-trading/get-portfolio.md
- `get_watchlists` — Read — https://policylayer.com/tools/robinhood-agentic-trading/get-watchlists.md
- `review_equity_order` — Read — https://policylayer.com/tools/robinhood-agentic-trading/review-equity-order.md
- `search` — Read — https://policylayer.com/tools/robinhood-agentic-trading/search.md
- `add_to_watchlist` — Write — https://policylayer.com/tools/robinhood-agentic-trading/add-to-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=robinhood-agentic-trading · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/robinhood-agentic-trading