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Cloudflare: Worker custom domains

cf_workers_domains_list
Read-only

List custom domains attached to Workers at account level. Optional accountId or zoneOrId to resolve account.

Input Schema

NameRequiredDescriptionDefault
zoneOrIdNoZone name (e.g. your-tenant.com) or zone ID to resolve account.id
accountIdNoCloudflare account ID; overrides CLOUDFLARE_ACCOUNT_ID and zone.account.id
context_idNoOptional explicit Connection Hub work context (ctx_*). Omit to use the conversation's active workspace; global Hub tools ignore it.
account_slugNoCloudflare account slug. Required when the workspace has multiple accounts and the zone is not yet cataloged.
environment_slugNoCloud Catalog environment used as an account-routing preference when no zone is provided.

Output Schema

NameRequiredDescriptionDefault
okYes
dataYes
contractVersionYes
dataSchemaVersionYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed16 schema fields changed
    • changedOutput schema / properties / data / additionalProperties
      Previous value: -trueNew value: +false
    • removedOutput schema / properties / data / properties / count
      Removed value: -{
      -  "type": "number"
      -}
    • removedOutput schema / properties / data / properties / errors
      Removed value: -{
      -  "items": {
      -    "$ref": "#/properties/data/properties/result/anyOf/0/items"
      -  },
      -  "type": "array"
      -}
    • addedOutput schema / properties / data / properties / gaps
      Added value: +{
      +  "items": {
      +    "type": "string"
      +  },
      +  "type": "array"
      +}
    • removedOutput schema / properties / data / properties / items
      Removed value: -{
      -  "$ref": "#/properties/data/properties/result/anyOf/0"
      -}
    • removedOutput schema / properties / data / properties / messages
      Removed value: -{
      -  "items": {
      -    "anyOf": [
      -      {
      -        "type": "string"
      -      },
      -      {
      -        "$ref": "#/properties/data/properties/result/anyOf/0/items"
      -      }
      -    ]
      -  },
      -  "type": "array"
      -}
    • addedOutput schema / properties / data / properties / partial
      Added value: +{
      +  "type": "boolean"
      +}
    • removedOutput schema / properties / data / properties / result
      Removed value: -{
      -  "anyOf": [
      -    {
      -      "items": {
      -        "additionalProperties": true,
      -        "properties": {},
      -        "type": "object"
      -      },
      -      "type": "array"
      -    },
      -    {
      -      "$ref": "#/properties/data/properties/result/anyOf/0/items"
      -    }
      -  ]
      -}
    • removedOutput schema / properties / data / properties / result_info
      Removed value: -{
      -  "$ref": "#/properties/data/properties/result/anyOf/0/items"
      -}
    • addedOutput schema / properties / data / properties / scripts
      Added value: +{
      +  "items": {
      +    "additionalProperties": false,
      +    "properties": {
      +      "createdOn": {
      +        "format": "date-time",
      +        "type": "string"
      +      },
      +      "id": {
      +        "type": "string"
      +      },
      +      "tag": {
      +        "type": "string"
      +      }
      +    },
      +    "required": [
      +      "id"
      +    ],
      +    "type": "object"
      +  },
      +  "type": "array"
      +}
    • removedOutput schema / properties / data / properties / success
      Removed value: -{
      -  "type": "boolean"
      -}
    • addedOutput schema / properties / data / properties / truncated
      Added value: +{
      +  "type": "boolean"
      +}
    • addedOutput schema / properties / data / properties / warnings
      Added value: +{
      +  "items": {
      +    "type": "string"
      +  },
      +  "type": "array"
      +}
    • addedOutput schema / properties / data / required
      Added value: +[
      +  "scripts",
      +  "partial",
      +  "truncated",
      +  "warnings",
      +  "gaps"
      +]
    • addedOutput schema / properties / dataSchemaVersion
      Added value: +{
      +  "const": 2,
      +  "type": "number"
      +}
    • changedOutput schema / required
      Previous value: -[
      -  "contractVersion",
      -  "ok",
      -  "data"
      -]New value: +[
      +  "contractVersion",
      +  "dataSchemaVersion",
      +  "ok",
      +  "data"
      +]
  2. First observed

TDQS

A3.6/5.0
Behavior3/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnlyHint=true and destructiveHint=false, so the safety profile is clear. The description adds the account-level scoping context and account-resolution inputs, but does not mention pagination, result limits, or authentication assumptions beyond what annotations and schema provide.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Two short sentences, front-loaded with the core listing action and followed by the only notable routing hint. There is no filler or redundant restatement of the name.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a read-only listing tool with full schema coverage, an output schema, and safe annotations, the description is largely complete. It covers scope and account resolution, though it could do more to route agents away from route-based siblings.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so all five parameters are already documented in the input schema. The description only restates that accountId or zoneOrId resolve the account and adds no extra semantics beyond the schema, making the baseline 3 appropriate.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description states a specific verb and resource: listing custom domains attached to Workers, scoped to account level. This distinguishes it from generic route-listing siblings, but it never names cf_workers_routes_list or explicitly contrasts custom domains with routes.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Usage is implied by the listing phrasing, and the description notes that accountId or zoneOrId may be used to resolve the account. It does not say when to choose this over cf_workers_routes_list or other Workers-related listing tools, so selection still requires inference.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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