set_item_custom_domain · Manifest MCP: Risk & Policy

WHAT IT DOES

What set_item_custom_domain does on Manifest MCP

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

WHY IT NEEDS A POLICY

Why set_item_custom_domain needs a policy

This tool modifies lease item properties (custom domain configuration) which is reversible and affects only metadata/configuration, not financial transactions or irreversible deletions. It qualifies as a Write operation. Severity is medium because domain configuration changes could affect service routing or access, but the blast radius is limited to that specific lease item's configuration.

From the tool's definition Tool name 'set_item_custom_domain' and description 'Set or clear the custom domain (FQDN) on a lease item' indicate modification of lease configuration data. The verb 'set' and 'clear' confirm data mutation rather than read-only access.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_item_custom_domain Rate-limited

set_item_custom_domain 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": {
    "set_item_custom_domain": {
      "limits": [
        {
          "counter": "set_item_custom_domain_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 Manifest MCP, so you can run agents against it safely.

FAQ

Questions about set_item_custom_domain

What does the set_item_custom_domain tool do? +

Set or clear the custom domain (FQDN) on a lease item. Pass. It is categorised as a Write tool in the Manifest MCP 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_item_custom_domain? +

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

What risk level is set_item_custom_domain? +

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

Can I rate-limit set_item_custom_domain? +

Yes. Add a rate_limit block to the set_item_custom_domain 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_item_custom_domain completely? +

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

set_item_custom_domain is provided by the Manifest MCP server (manifest-network/manifest-mcp-mono). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.