invalid_call

The invalid_call Problem means: an MCP tool call named an unknown operation or sent input it cannot read.

Answer

Status	Title
400	Bad Request

JSON

{
  "type": "about:blank",
  "title": "Bad Request",
  "status": 400,
  "detail": "What went wrong, in words.",
  "code": "invalid_call"
}

Call search for the operation, then do with its verb and input.