● Reference

Errors.

One envelope, seven codes. Four transport, three domain gates. The gates are the moat: they encode legal and compliance reality and they never soft-pass.

{
  "error": {
    "code": "authority_required",
    "message": "No granted authority model on matter mtr_4Fa1.",
    "md_request_id": "req_01JX4M..."
  }
}

Code	HTTP	Meaning	Class
invalid_request	400	Malformed body, unknown field, or failed validation.	transport
unauthenticated	401	Missing or invalid API key.	transport
insufficient_scope	403	Key lacks the scope this operation requires.	transport
rate_limited	429	Too many requests; honor Retry-After.	transport
authority_required	403	No granted authority model on the parent matter. Never soft-passes.	domain gate
sanctions_gate	403	A sanctions screen hit blocks this operation pending review.	domain gate
stay_in_effect	409	An enforcement stay is in effect for this matter.	domain gate