MCP Tools Reference: apptopology.googleapis.com

Tool: list_domains

ListDomains method returns all available topology domains in a specific location.

The following code sample shows how to use curl to call the list_domains MCP tool.

Curl Request 
curl --location 'https://apptopology.googleapis.com/mcp' \
--header 'content-type: application/json' \
--header 'accept: application/json, text/event-stream' \
--data '{
  "method": "tools/call",
  "params": {
    "name": "list_domains",
    "arguments": {
      // Provide these details according to the MCP tool specification.
    }
  },
  "jsonrpc": "2.0",
  "id": 1
}'

Input Schema

Request for ListDomains.

ListDomainsRequest

JSON representation 
{
  "parent": string,
  "pageSize": integer,
  "pageToken": string
}
Fields
parent

string

Required. The parent location to list domains for. Format: projects/{project}/locations/{location} Only global location is supported.
pageSize

integer

Optional. The maximum number of domains to return. The service may return fewer than this value. If unspecified, at most 50 domains will be returned. The maximum value is 1000; values above 1000 will be coerced to 1000.
pageToken

string

Optional. A page token, received from a previous ListDomains call. Provide this to retrieve the subsequent page.

When paginating, all other parameters provided to ListDomains must match the call that provided the page token.

Output Schema

Response for ListDomains.

ListDomainsResponse

JSON representation 
{
  "domains": [
    {
      object (Domain)
    }
  ],
  "nextPageToken": string
}
Fields
domains[]

object (Domain)

The domains in the specified location.
nextPageToken

string

A token that can be sent as page_token to retrieve the next page. If this field is omitted, there are no subsequent pages.

Domain

JSON representation 
{
  "name": string
}
Fields
name

string

Identifier. The pre-defined topology domain. Currently only SRE, DEVOPS, and SECURITY are available. Format: projects/{project}/locations/{location}/domains/{domain}

Tool Annotations

Tool annotations are sent to MCP clients to describe the basic risk of a given tool. Most clients treat these hints as untrusted, but they can be used to decide when a confirmation prompt might be sent to a user.

Along with the title string, the following boolean hints are defined as follows:

  • readOnlyHint: If true, the tool doesn't modify its environment. Default: false.
  • destructiveHint: If true, then the tool can perform destructive actions. If false, then the tool can only perform additive actions. Default: true.
  • idempotentHint: If true, then calling the tool repeatedly with the same arguments will have no additional effect on its environment. Default: false.
  • openWorldHint: If true, then the tool can interact with an 'open world' of external entities. If false, then the tool can only interact with internal entities. For example, a web search tool would be open world, while a memory tool would not be open world.

Destructive Hint: ❌ | Idempotent Hint: ✅ | Read Only Hint: ✅ | Open World Hint: ❌