scan_watchlist · Nubra MCP Server MCP: Risk & Policy

WHAT IT DOES

What scan_watchlist does on Nubra MCP Server

AI agents invoke scan_watchlist to trigger actions in Nubra MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why scan_watchlist needs a policy

The tool runs/executes analytical scan operations rather than simply reading static data. While it doesn't modify data or place orders, it triggers computational processes against market data with results depending on scan type and parameters. Severity is medium because misuse could lead to unintended automated trading signals or resource exhaustion, though it has no direct destructive or financial effect.

From the tool's definition 'Run a reusable watchlist scan' — actively executes a scan operation (volume_spike, volume_breakout, rsi_threshold, ema_crossover, oi_wall, return_rank) against live or stored data

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

scan_watchlist Rate-limited

scan_watchlist stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "scan_watchlist": {
      "limits": [
        {
          "counter": "scan_watchlist_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-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 scan_watchlist

What does the scan_watchlist tool do? +

Run a reusable watchlist scan such as volume_spike, volume_breakout, rsi_threshold, ema_crossover, oi_wall, or return_rank. It is categorised as a Execute tool in the Nubra MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on scan_watchlist? +

Register the Nubra MCP Server MCP server in PolicyLayer and add a rule for scan_watchlist: 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 scan_watchlist? +

scan_watchlist is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit scan_watchlist? +

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

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

scan_watchlist 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.