nina_stop_slew

THE RISK

High Risk

Why nina_stop_slew needs a policy

Stopping a mount slew is an Execute action because it runs/triggers an external operation on astronomy hardware. It is not Read (no data retrieval), Write (not creating/modifying persistent data reversibly), Destructive (the action is reversible—the mount can slew again), or Financial.

From the tool's definition Tool description states 'Stop the mount's current slew' — this triggers an immediate action on hardware (telescope mount) that interrupts an ongoing operation. The effect is external and state-dependent on what the mount is currently doing.

Documented attack patterns abuse exactly the kind of access nina_stop_slew gives an agent:

POLICY

How to control nina_stop_slew

PolicyLayer is an MCP gateway — it sits between your AI agents and Nina Advanced API MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for nina_stop_slew:

policy.json

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

nina_stop_slew 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.

Create a free account and register Nina Advanced API MCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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All 103 Nina Advanced API MCP tools →

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Go deeper

High-risk tools in Nina Advanced API MCP → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about nina_stop_slew

What does the nina_stop_slew tool do? +

Stop the mount's current slew in NINA astronomy software. It is categorised as a Execute tool in the Nina Advanced API MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on nina_stop_slew? +

Register the Nina Advanced API MCP server in PolicyLayer and add a rule for nina_stop_slew: 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 Nina Advanced API MCP. Nothing to install.

What risk level is nina_stop_slew? +

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

Can I rate-limit nina_stop_slew? +

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

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

nina_stop_slew is provided by the Nina Advanced API MCP server (padev1/nina_advanced_api_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Nina Advanced API MCP tool call.

Start from Nina Advanced API MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →