API Errors - Circuit

All endpoints return standard HTTP status codes and a consistent error response format.

All error responses follow this structure:

{
  success: false;
  error: string;
}

5xx (internal) errors always return the generic message "Internal server error" - the underlying detail is never leaked to the client.

Status	When
`400`	Bad request - invalid or missing input
`401`	Unauthorized - missing, invalid, revoked, or expired bearer token
`403`	Forbidden - authenticated but not allowed for the resource
`404`	Not found - resource does not exist or is not visible
`409`	Conflict - request conflicts with current state
`412`	Precondition failed
`429`	Too many requests - rate limited
`502` / `503`	Upstream / service unavailable
`500`	Internal server error

Status	Example Message	Notes
`400`	`"Invalid request input"`	Request body/query/path failed schema validation
`401`	`"Missing Authorization: Bearer header"`	Token missing, invalid, or expired
`403`	`"You are not authorized to stop this session"`	Authenticated but not allowed for the resource
`404`	`"Agent not found"`, `"Session not found"`	Resource does not exist or is not visible
`409`	`"Wallet already exists"`	Request conflicts with current state
`500`	`"Internal server error"`	Unexpected backend error