set_global_rule

THE RISK

Medium Risk

Why set_global_rule needs a policy

This tool modifies system-wide state (global rules) in a reversible manner (rules can typically be updated or removed later). It is Write rather than Execute because it configures behavior rather than triggering external operations. Severity is high because misconfigured global rules could affect all projects and sessions, creating broad impact across the agent's operational environment.

From the tool's definition 'Set a permanent global rule that persists across all projects and sessions' describes creation of configuration data with cross-session durability.

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

POLICY

How to control set_global_rule

PolicyLayer is an MCP gateway — it sits between your AI agents and A-Modular-Kingdom, and nothing reaches the server without passing your rules. This is the rule we recommend for set_global_rule:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "set_global_rule": {
      "limits": [
        {
          "counter": "set_global_rule_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

set_global_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.

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

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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All 14 A-Modular-Kingdom tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about set_global_rule

What does the set_global_rule tool do? +

Set a permanent global rule that persists across all projects and sessions. It is categorised as a Write tool in the A-Modular-Kingdom MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on set_global_rule? +

Register the A-Modular-Kingdom MCP server in PolicyLayer and add a rule for set_global_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 A-Modular-Kingdom. Nothing to install.

What risk level is set_global_rule? +

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

Can I rate-limit set_global_rule? +

Yes. Add a rate_limit block to the set_global_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 set_global_rule completely? +

Set action: deny in the PolicyLayer policy for set_global_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 set_global_rule? +

set_global_rule is provided by the A-Modular-Kingdom MCP server (masihmoafi/a-modular-kingdom). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every A-Modular-Kingdom tool call.

Start from A-Modular-Kingdom, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →