indicator_set_inputs · TradingView MCP: Risk & Policy

WHAT IT DOES

What indicator_set_inputs does on TradingView MCP

AI agents use indicator_set_inputs 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 indicator_set_inputs needs a policy

This tool modifies indicator settings reversibly without executing trades or causing data loss. The changes to input parameters can be undone by adjusting values again. While it affects chart analysis and could influence trading decisions if the AI misapplies it, the action itself is a non-destructive configuration change.

From the tool's definition Tool description explicitly states 'Change indicator/study input values' — a modification operation on indicator configurations (length, source, period parameters).

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

indicator_set_inputs Rate-limited

indicator_set_inputs 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": {
    "indicator_set_inputs": {
      "limits": [
        {
          "counter": "indicator_set_inputs_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 indicator_set_inputs

What does the indicator_set_inputs tool do? +

Change indicator/study input values (e.g., length, source, period). 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 indicator_set_inputs? +

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

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

Can I rate-limit indicator_set_inputs? +

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

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

indicator_set_inputs 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.