meshes_create_rule · Mesheshq MCP: Risk & Policy

WHAT IT DOES

What meshes_create_rule does on Mesheshq

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

WHY IT NEEDS A POLICY

Why meshes_create_rule needs a policy

This tool creates routing rules that establish bindings between events and connections. While it creates configuration data (reversible via meshes_delete_rule), the act of creating rules that route events to destinations could have downstream effects on integration behavior and data flow.

From the tool's definition Tool name is 'meshes_create_rule' and description states 'Create a routing rule that binds an event type to a connection.' The verb 'Create' and the action of binding configuration indicates data creation/modification.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

meshes_create_rule Rate-limited

meshes_create_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": {
    "meshes_create_rule": {
      "limits": [
        {
          "counter": "meshes_create_rule_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Mesheshq, so you can run agents against it safely.

FAQ

Questions about meshes_create_rule

What does the meshes_create_rule tool do? +

Create a routing rule that binds an event type to a connection. The metadata.action field is required and determines what the destination does (e.g.,. It is categorised as a Write tool in the Mesheshq MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on meshes_create_rule? +

Register the Mesheshq MCP server in PolicyLayer and add a rule for meshes_create_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 Mesheshq. Nothing to install.

What risk level is meshes_create_rule? +

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

Can I rate-limit meshes_create_rule? +

Yes. Add a rate_limit block to the meshes_create_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 meshes_create_rule completely? +

Set action: deny in the PolicyLayer policy for meshes_create_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 meshes_create_rule? +

meshes_create_rule is provided by the Mesheshq MCP server (mesheshq/meshes-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.