chart_set_symbol · TradingView MCP Jackson MCP

WHAT IT DOES

What chart_set_symbol does on TradingView MCP Jackson

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

WHY IT NEEDS A POLICY

Why chart_set_symbol needs a policy

This tool modifies the chart display by changing which financial symbol is shown. This is a Write operation because it creates or modifies state reversibly. Severity is medium because while the direct effect is benign (merely switching what data is displayed), if misused by an AI agent in an automated loop, it could disrupt user workflows or trigger dependent operations (like alerts) unexpectedly.

From the tool's definition The tool description states 'Change the chart symbol' — a modification of chart state. While reversible through changing the symbol again, it alters the active chart display, which is a write operation.

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 Jackson, 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 Jackson 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 Jackson 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 Jackson. 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 Jackson MCP server (nimit791/tradingview-mcp-jackson). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.