chart_set_symbol · TradingView MCP Bridge MCP: Risk & Policy

WHAT IT DOES

What chart_set_symbol does on TradingView MCP Bridge

AI agents use chart_set_symbol 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 chart_set_symbol needs a policy

This tool changes the active symbol displayed on the TradingView chart. It's a reversible modification of the chart's state (can be changed back), qualifying as Write. Severity is medium because misuse could disrupt an analyst's workflow or cause unintended analysis on the wrong asset, but it doesn't delete data or move money.

From the tool's definition 'Change the chart symbol' — modifies the state of the chart by switching to a different trading symbol

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

chart_set_symbol Rate-limited

chart_set_symbol 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": {
    "chart_set_symbol": {
      "limits": [
        {
          "counter": "chart_set_symbol_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 chart_set_symbol

What does the chart_set_symbol tool do? +

Change the chart symbol. 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 chart_set_symbol? +

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

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

Can I rate-limit chart_set_symbol? +

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

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

chart_set_symbol 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.