add_to_watchlist · Robinhood Agentic Trading MCP

WHAT IT DOES

What add_to_watchlist does on Robinhood Agentic Trading

AI agents use add_to_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.

PARAMETERS

Parameter	Type	Required	Description
`symbol`	string	Yes
`watchlist`	string	—

Parameters from the server's own tool schema.

WHY IT NEEDS A POLICY

Why add_to_watchlist needs a policy

The add_to_watchlist tool modifies watchlist data by adding a security, fitting the Write category. While the Robinhood server as a whole involves financial trading operations (including place_equity_order which is Execute), this specific tool merely organizes user data without executing trades, moving money, or creating financial obligations.

From the tool's definition Tool description states 'Add a security to a watchlist,' which creates or modifies a watchlist entry. This is a reversible write operation (securities can be removed from watchlists).

Risk signalsModifies account watchlists

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

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.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Robinhood Agentic Trading, so you can run agents against it safely.

FAQ

Questions about add_to_watchlist

What does the add_to_watchlist tool do? +

Add a security to a watchlist. It is categorised as a Write tool in the Robinhood Agentic Trading MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

What parameters does add_to_watchlist accept? +

add_to_watchlist accepts 2 parameters: symbol, watchlist. Required: symbol. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on add_to_watchlist? +

Register the Robinhood Agentic Trading 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 Robinhood Agentic Trading. 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 Robinhood Agentic Trading MCP server (https://agent.robinhood.com/mcp/trading). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.