Create an Atlas cluster in a project

POST /api/v1/atlas/projects/{project_id}/clusters
Bearer auth

Creates a Flex cluster when tier is omitted or FLEX, or a dedicated replica set for a dedicated instance size such as M10. Uses a human caller's delegated token or a paired Agent Engine service account. Agent Engine API keys are not accepted. Invalid project_id is rejected before any Atlas call. Atlas 402 (no payment method) and 403 (insufficient Atlas permission) are mapped to distinct Agent Engine error codes.

Path parameters

  • project_id string Required

    Atlas project ID

application/json
Body object Required

Cluster to create

One of:
object-1 object object

Responses

  • 406

    Unsupported or malformed API version, an operation unavailable in the selected published contract, or an unacceptable representation (including unsupported media-type parameters or excluded SSE). Existing authentication, authorization, and rate-limit failures take precedence.

    Hide response attributes Show response attributes object
    • badRequestDetail object

      Optional validation details defined by the standard error schema; API negotiation errors do not emit this field.

      Hide badRequestDetail attribute Show badRequestDetail attribute object
      • fields array[object]

        Fields with validation failures.

        Hide fields attributes Show fields attributes object

        A field and its validation failure.

        • description string Required

          Human-readable validation failure.

        • field string Required

          Name or path of the invalid request field.

    • detail string Required

      Human-readable error details.

    • error integer Required

      HTTP status code.

    • errorCode string Required

      Machine-readable error code.

    • parameters array[string]

      Request parameter names associated with the error; omitted when none apply.

    • reason string Required

      HTTP status reason phrase.

    Hide response attributes Show response attributes object
    • badRequestDetail object

      Optional validation details defined by the standard error schema; API negotiation errors do not emit this field.

      Hide badRequestDetail attribute Show badRequestDetail attribute object
      • fields array[object]

        Fields with validation failures.

        Hide fields attributes Show fields attributes object

        A field and its validation failure.

        • description string Required

          Human-readable validation failure.

        • field string Required

          Name or path of the invalid request field.

    • detail string Required

      Human-readable error details.

    • error integer Required

      HTTP status code.

    • errorCode string Required

      Machine-readable error code.

    • parameters array[string]

      Request parameter names associated with the error; omitted when none apply.

    • reason string Required

      HTTP status reason phrase.
  • 201

    Created

    Hide response attributes Show response attributes object
    • connection_string_srv string
    • id string
    • is_flex boolean
    • name string
    • provider string
    • region string
    • state_name string
    • tier string
    Hide response attributes Show response attributes object
    • connection_string_srv string
    • id string
    • is_flex boolean
    • name string
    • provider string
    • region string
    • state_name string
    • tier string
  • 400

    Bad Request

    Hide response attributes Show response attributes object
    • code string
    • error string
    • success boolean
    Hide response attributes Show response attributes object
    • code string
    • error string
    • success boolean
  • 401

    Unauthorized

    Hide response attributes Show response attributes object
    • code string
    • error string
    • success boolean
    Hide response attributes Show response attributes object
    • code string
    • error string
    • success boolean
  • 402

    ATLAS_PAYMENT_METHOD_REQUIRED

    Hide response attributes Show response attributes object
    • code string
    • error string
    • success boolean
    Hide response attributes Show response attributes object
    • code string
    • error string
    • success boolean
  • 403

    ATLAS_PERMISSION_REQUIRED, ATLAS_SERVICE_ACCOUNT_NOT_PAIRED, or FORBIDDEN

    Hide response attributes Show response attributes object
    • code string
    • error string
    • success boolean
    Hide response attributes Show response attributes object
    • code string
    • error string
    • success boolean
  • 404

    NOT_FOUND

    Hide response attributes Show response attributes object
    • code string
    • error string
    • success boolean
    Hide response attributes Show response attributes object
    • code string
    • error string
    • success boolean
  • 409

    Conflict

    Hide response attributes Show response attributes object
    • code string
    • error string
    • success boolean
    Hide response attributes Show response attributes object
    • code string
    • error string
    • success boolean
  • 413

    request body too large

    Hide response attributes Show response attributes object
    • code string
    • error string
    • success boolean
    Hide response attributes Show response attributes object
    • code string
    • error string
    • success boolean
  • 500

    INTERNAL_ERROR

    Hide response attributes Show response attributes object
    • code string
    • error string
    • success boolean
    Hide response attributes Show response attributes object
    • code string
    • error string
    • success boolean
  • 502

    Bad Gateway

    Hide response attributes Show response attributes object
    • code string
    • error string
    • success boolean
    Hide response attributes Show response attributes object
    • code string
    • error string
    • success boolean
  • 503

    PLATFORM_OAUTH_NOT_CONFIGURED or SERVICE_UNAVAILABLE when a delegated token refresh is already in progress

    Hide response attributes Show response attributes object
    • code string
    • error string
    • success boolean
    Hide response attributes Show response attributes object
    • code string
    • error string
    • success boolean
POST /api/v1/atlas/projects/{project_id}/clusters 
curl \
 --request POST 'https://agentengine.mongodb.com/api/v1/atlas/projects/{project_id}/clusters' \
 --header "Authorization: $API_KEY" \
 --header "Content-Type: application/json"
Request examples 
{}
{
  "name": "string",
  "provider": "string",
  "region": "string",
  "tier": "string"
}
Response examples (406) 
{
  "detail": "This operation is not available in API version 2026-09-20-preview.",
  "error": 406,
  "errorCode": "OPERATION_NOT_IN_API_VERSION",
  "parameters": [
    "Accept"
  ],
  "reason": "Not Acceptable"
}
{
  "detail": "This operation supports text/event-stream, which the Accept header excludes. Remove unsupported media-type parameters or accept this type with a positive q value.",
  "error": 406,
  "errorCode": "UNACCEPTABLE_MEDIA_TYPE",
  "parameters": [
    "Accept"
  ],
  "reason": "Not Acceptable"
}
{
  "detail": "The requested API version is not supported. Supported versions: 2026-09-20-preview.",
  "error": 406,
  "errorCode": "UNSUPPORTED_API_VERSION",
  "parameters": [
    "Accept"
  ],
  "reason": "Not Acceptable"
}
Response examples (406) 
{
  "detail": "This operation is not available in API version 2026-09-20-preview.",
  "error": 406,
  "errorCode": "OPERATION_NOT_IN_API_VERSION",
  "parameters": [
    "Accept"
  ],
  "reason": "Not Acceptable"
}
Response examples (201) 
{
  "connection_string_srv": "string",
  "id": "string",
  "is_flex": true,
  "name": "string",
  "provider": "string",
  "region": "string",
  "state_name": "string",
  "tier": "string"
}
Response examples (201) 
{
  "connection_string_srv": "string",
  "id": "string",
  "is_flex": true,
  "name": "string",
  "provider": "string",
  "region": "string",
  "state_name": "string",
  "tier": "string"
}
Response examples (400) 
{
  "code": "string",
  "error": "string",
  "success": true
}
Response examples (400) 
{
  "code": "string",
  "error": "string",
  "success": true
}
Response examples (401) 
{
  "code": "string",
  "error": "string",
  "success": true
}
Response examples (401) 
{
  "code": "string",
  "error": "string",
  "success": true
}
Response examples (402) 
{
  "code": "string",
  "error": "string",
  "success": true
}
Response examples (402) 
{
  "code": "string",
  "error": "string",
  "success": true
}
Response examples (403) 
{
  "code": "string",
  "error": "string",
  "success": true
}
Response examples (403) 
{
  "code": "string",
  "error": "string",
  "success": true
}
Response examples (404) 
{
  "code": "string",
  "error": "string",
  "success": true
}
Response examples (404) 
{
  "code": "string",
  "error": "string",
  "success": true
}
Response examples (409) 
{
  "code": "string",
  "error": "string",
  "success": true
}
Response examples (409) 
{
  "code": "string",
  "error": "string",
  "success": true
}
Response examples (413) 
{
  "code": "string",
  "error": "string",
  "success": true
}
Response examples (413) 
{
  "code": "string",
  "error": "string",
  "success": true
}
Response examples (500) 
{
  "code": "string",
  "error": "string",
  "success": true
}
Response examples (500) 
{
  "code": "string",
  "error": "string",
  "success": true
}
Response examples (502) 
{
  "code": "string",
  "error": "string",
  "success": true
}
Response examples (502) 
{
  "code": "string",
  "error": "string",
  "success": true
}
Response examples (503) 
{
  "code": "string",
  "error": "string",
  "success": true
}
Response examples (503) 
{
  "code": "string",
  "error": "string",
  "success": true
}