pine_set_source · TradingView MCP Bridge MCP: Risk & Policy

WHAT IT DOES

What pine_set_source does on TradingView MCP Bridge

AI agents use pine_set_source 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 pine_set_source needs a policy

This tool creates or modifies Pine Script source code, which is reversible (can be overwritten or undone via subsequent calls). It does not execute the code, merely sets it in the editor.

From the tool's definition Tool description explicitly states 'Set Pine Script source code in the editor' — this is a direct modification operation that creates or updates code in the TradingView editor.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

pine_set_source Rate-limited

pine_set_source 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": {
    "pine_set_source": {
      "limits": [
        {
          "counter": "pine_set_source_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 pine_set_source

What does the pine_set_source tool do? +

Set Pine Script source code in the editor. 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 pine_set_source? +

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

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

Can I rate-limit pine_set_source? +

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

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

pine_set_source 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.