export_backtest_equity_curve_image · Nubra MCP Server MCP

WHAT IT DOES

What export_backtest_equity_curve_image does on Nubra MCP Server

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

WHY IT NEEDS A POLICY

Why export_backtest_equity_curve_image needs a policy

The tool creates a new file on the local filesystem by exporting backtest results as a PNG image. This is a write operation—it generates and stores data, but does not irreversibly delete data, execute arbitrary code, move money, or trigger external side effects beyond file creation. The impact is limited to creating a local report artifact with no blast radius for portfolio or trading decisions.

From the tool's definition Tool generates and exports an image file (PNG) to local storage. Description states 'Export the backtest equity curve as a local PNG file.' This is a file creation operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

export_backtest_equity_curve_image Rate-limited

export_backtest_equity_curve_image 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": {
    "export_backtest_equity_curve_image": {
      "limits": [
        {
          "counter": "export_backtest_equity_curve_image_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 Nubra MCP Server, so you can run agents against it safely.

FAQ

Questions about export_backtest_equity_curve_image

What does the export_backtest_equity_curve_image tool do? +

Export the backtest equity curve as a local PNG file. Required inputs: symbol, timeframe, strategy_type. It is categorised as a Write tool in the Nubra MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on export_backtest_equity_curve_image? +

Register the Nubra MCP Server MCP server in PolicyLayer and add a rule for export_backtest_equity_curve_image: 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 Nubra MCP Server. Nothing to install.

What risk level is export_backtest_equity_curve_image? +

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

Can I rate-limit export_backtest_equity_curve_image? +

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

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

export_backtest_equity_curve_image is provided by the Nubra MCP Server MCP server (socials-zanskar/nubra-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.