watchlist_add · TradingView MCP Bridge MCP: Risk & Policy

WHAT IT DOES

What watchlist_add does on TradingView MCP Bridge

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

WHY IT NEEDS A POLICY

Why watchlist_add needs a policy

This is a Write operation because it creates/modifies data (the watchlist) in a reversible manner. The severity is medium because while watchlist modifications are not inherently destructive, an AI agent could maliciously add many unwanted symbols, create confusion in the user's workflow, or add volatile/illiquid instruments that the user did not intend to monitor.

From the tool's definition Tool performs 'Add a symbol to the TradingView watchlist' — a create operation that modifies the user's watchlist state by inserting a new entry.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

watchlist_add Rate-limited

watchlist_add 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": {
    "watchlist_add": {
      "limits": [
        {
          "counter": "watchlist_add_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 TradingView MCP Bridge, so you can run agents against it safely.

FAQ

Questions about watchlist_add

What does the watchlist_add tool do? +

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

How do I enforce a policy on watchlist_add? +

Register the TradingView MCP Bridge MCP server in PolicyLayer and add a rule for watchlist_add: 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 TradingView MCP Bridge. Nothing to install.

What risk level is watchlist_add? +

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

Can I rate-limit watchlist_add? +

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

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

watchlist_add is provided by the TradingView MCP Bridge MCP server (thinhbv/tradingview_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.