{
  "_comment": "v0.2 string content — the most common pre-rename shape. Caused the 2026-04-29 silent-drop bug: a-2-a-sdk v0.3 renamed params.message.content (string) -> params.message.parts (Part list). Shipped PR #2349 to compat-shim this in normalizeA2APayload.",
  "_added": "2026-04-30",
  "_source": "PR #2349 incident reproduction",
  "jsonrpc": "2.0",
  "method": "message/send",
  "id": "msg-test-v02-string",
  "params": {
    "message": {
      "messageId": "msg-1",
      "role": "user",
      "content": "hello world"
    }
  }
}
