tab_new · TradingView MCP Bridge MCP: Risk & Policy

WHAT IT DOES

What tab_new does on TradingView MCP Bridge

AI agents invoke tab_new to trigger actions in TradingView MCP Bridge. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why tab_new needs a policy

This tool executes a command (tab creation) against TradingView Desktop via Chrome DevTools Protocol. While not destructive or financial, it is an action that causes observable state changes in an external system. The tool can be misused to repeatedly open tabs consuming resources or interfering with user workflows.

From the tool's definition Tool name 'tab_new' with description 'Open a new chart tab' indicates an action that triggers external operations via Chrome DevTools Protocol.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

tab_new Rate-limited

tab_new stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "tab_new": {
      "limits": [
        {
          "counter": "tab_new_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-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 tab_new

What does the tab_new tool do? +

Open a new chart tab. It is categorised as a Execute tool in the TradingView MCP Bridge MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on tab_new? +

Register the TradingView MCP Bridge MCP server in PolicyLayer and add a rule for tab_new: 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 tab_new? +

tab_new is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit tab_new? +

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

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

tab_new 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.