hs sandbox create fails with error "unable to deduce user-brief from this request"

[davidrebellon]

CLI Version

8.2.0

Node.js Version

22.18.0

Operating System

macOS 15.7.3

Description

hs sandbox create sends double-serialized JSON body to sandbox-hubs/v2/sandboxes, resulting in 400 error (v8.2.0)

Running hs sandbox create fails when attempting to create a developer sandbox. The POST request body sent to sandbox-hubs/v2/sandboxes is double-JSON-stringified — the payload object is serialized to a string, then serialized again — causing the API to return a 400 error.

Steps to Reproduce

1. Run hs sandbox create --debug
2. Select Development sandbox when prompted
3. Enter a name for the sandbox

Expected Behavior

Development Sandbox is created under selected account

Screenshots

No response

Additional Context

The CLI sends a malformed request body where the JSON payload is double-serialized:

payload: "\"{\\\"name\\\":\\\"development\\\",\\\"type\\\":\\\"DEVELOPER\\\",\\\"syncObjectRecords\\\":false}\""

The API responds with:

status: 400
message: Unable to deduce user-brief from this request.
correlationId: 019d3f02-922c-7f7e-af5e-b1ebff9dae88

Debug Output (relevant excerpt)

[DEBUG] {
  method: 'post',
  baseURL: 'https://api.hubapi.com',
  url: 'sandbox-hubs/v2/sandboxes',
  data: {
    status: 'error',
    message: 'Unable to deduce user-brief from this request.',
    correlationId: '019d3f02-922c-7f7e-af5e-b1ebff9dae88'
  },
  status: 400
}
[ERROR] Unable to deduce user-brief from this request.

Additional Context

• Account usage check confirms sandbox slot is available: DEVELOPER: { used: 0, available: 1, limit: 1 }
• All required feature flags are enabled (sandboxes:v2:cliEnabled: true, sandboxes:v2:enabled: true)
• The user is a super admin with full permissions on the Personal Access Key

[brandenrodgers]

Thanks for surfacing @davidrebellon! Looks like this was a recent regression on the sandboxes api. The team is looking into it now.