add_policy_rule

Grant an agent access to a specific tool on a specific server. Use toolName=

SERVERNitrostack SOURCEnitrocloudofficial/nitrostack

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/nitrostack/add-policy-rule.md

WHAT IT DOES

What add_policy_rule does on Nitrostack

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

RISK

Why add_policy_rule is rated Medium

Creates new access control rules that modify permissions for agent-tool interactions, affecting system authorization.

From the tool's definition Grant an agent access to a specific tool on a specific server.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs add_policy_rule safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Nitrostack, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For add_policy_rule, this is the rule to start with:

add_policy_rule Rate-limited

add_policy_rule 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": {
    "add_policy_rule": {
      "limits": [
        {
          "counter": "add_policy_rule_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Nitrostack, apply this rule, and every add_policy_rule call is checked against it from then on.

FAQ

Questions about add_policy_rule

What does the add_policy_rule tool do? +

Grant an agent access to a specific tool on a specific server. Use toolName=. It is categorised as a Write tool in the Nitrostack MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on add_policy_rule? +

Register the Nitrostack MCP server in PolicyLayer and add a rule for add_policy_rule: 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 Nitrostack. Nothing to install.

What risk level is add_policy_rule? +

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

Can I rate-limit add_policy_rule? +

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

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

add_policy_rule is provided by the Nitrostack MCP server (nitrocloudofficial/nitrostack). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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