AI agents use nina_disconnect_guider to create or update resources in Nina Advanced API MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Nina Advanced API MCP environment.
Disconnecting the guider terminates the connection to the guiding equipment, which is a reversible action (it can be reconnected). This modifies the system state by severing the guider connection, potentially interrupting an ongoing imaging session and causing tracking loss, but it does not irreversibly delete data or execute arbitrary code. It falls under Write as it changes the operational state of the equipment.
From the tool's definition Disconnect the guider.
Documented attack patterns abuse exactly the kind of access nina_disconnect_guider gives an agent:
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_disconnect_guider:
{
"version": "1",
"default": "deny",
"tools": {
"nina_disconnect_guider": {
"limits": [
{
"counter": "nina_disconnect_guider_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}nina_disconnect_guider 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.
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Disconnect the guider. It is categorised as a Write tool in the Nina Advanced API MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Nina Advanced API MCP server in PolicyLayer and add a rule for nina_disconnect_guider: 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.
nina_disconnect_guider is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the nina_disconnect_guider 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.
Set action: deny in the PolicyLayer policy for nina_disconnect_guider. 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.
nina_disconnect_guider 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.
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.
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103 Nina Advanced API MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.