Parameter 'message_action' type changed from '' to 'string' in GET /accounts/{account_id}/email-security/investigate

What changed

Parameter 'message_action' type changed from '' to 'string' in GET /accounts/{account_id}/email-security/investigate Affected surface: GET /accounts/{account_id}/email-security/investigate. Root cause: parameter `message_action@query`. Detected at Mon, 27 Apr 2026 18:32:04 UTC UTC.

Diff

{
  "current_value": "string",
  "parameter_in": "query",
  "parameter_name": "message_action",
  "path": "GET /accounts/{account_id}/email-security/investigate",
  "previous_value": ""
}

Likely impact

Existing integrations relying on this surface will fail or behave incorrectly. Treat this as a release-blocker until the recommended action below is applied.

Recommended action

Audit serialization on both sides. Type changes break payloads silently more often than loudly — catch this in a contract test before it hits production.