| 401 on every call | API token incomplete or trimmed when copied | Re-copy the full token from vm.massedcompute.com/settings/api; don't edit it. |
| Tool list missing destructive tools | Read-only key | Expected. If you need launch / terminate, generate a full-scope key. |
| 402 on launch | Billing not configured | Set recharge amount and threshold under Billing. |
| Cursor shows red MCP status | Cursor build older than 0.45 | Update Cursor; HTTP MCP requires 0.45+. |
| Image incompatible error | The chosen image doesn't match the chosen GPU | Pick a different image, or pick a different product. SXM-only images don't run on PCIe cards and vice versa. |
| Rate-limit (429) | Hitting our request limits | Wait a minute and try again. |