chart_set_type · TradingView MCP: Risk & Policy

WHAT IT DOES

What chart_set_type does on TradingView MCP

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

WHY IT NEEDS A POLICY

Why chart_set_type needs a policy

This tool changes the chart display type (e.g., candlestick, bar, line). It modifies the chart's configuration/state, which is a reversible write operation with minimal blast radius since it only affects the visual representation and can easily be changed back.

From the tool's definition 'Change chart type' — modifies the visual presentation of a chart

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

chart_set_type Rate-limited

chart_set_type 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_type": {
      "limits": [
        {
          "counter": "chart_set_type_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, so you can run agents against it safely.

FAQ

Questions about chart_set_type

What does the chart_set_type tool do? +

Change chart type. It is categorised as a Write tool in the TradingView MCP 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_type? +

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

What risk level is chart_set_type? +

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

Can I rate-limit chart_set_type? +

Yes. Add a rate_limit block to the chart_set_type 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_type completely? +

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

chart_set_type is provided by the TradingView MCP server (ulianbass/tradingview-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.