Introduction
In my Obsidian notes, sometimes it's useful to include external Markdown links using URL schemes to other apps such as 1Password Families, which is used by members of my family (me, wife, and sons).
Account notes
In my Family vault for my Family Knowledge effort, I have many Account notes for each of our family accounts with everything my wife and family need to know when I'm not available. This includes providing access to account websites.
Private links
However, I don't want to duplicate the website address and credentials in Obsidian, when It's already safely stored in the 1Password secure vault.
To eliminate the need to open 1Password, and then search the account to find the login item, I can use the Copy Private Link feature that copies a private link to the clipboard that I can paste in an Obsidian note to include a direct link to that account's login item.
This private link is only available to anyone with access to its vault, which might be private (just me), personal (but accessible by other members), shared (spouse and me), or shared (all).
Categories
You can get a private link for items in any category within the 1Password vaults: logins, credit cards, bank accounts, driver licenses, email accounts, memberships, rewards, passports, social security numbers, wireless routers, software licenses, identifies, databases, documents, or secure notes.
Menu
For any 1Password item, you select the Copy private link option from the More options (3 vertical dots) menu in the upper right corner of that Item.

Or in the 1Password app menu bar,

you can select the option in the Edit
menu:

Then just paste it from the clipboard to another application. In Obsidian, create an "external" Markdown link [label](url)
, identify the link with something like "1Password" as the label in square brackets and insert the "url" inside the round parentheses.
For me, It starts with https://start.1password.com/open/i?
, followed by several query parameters (such as a, v, i, and h) with their values and separated by "&" delimiters. I think probably v
and i
specify the vault and item being referenced; and perhaps h
is my 1Password home page and a
might be a key that represents my account.
API keys and tokens
Also, when I document API's for various apps, I don't want to include security information in the Obsidian notes. I can simply use the private link capability to reference the 1Password login item with the necessary information, such as the access token for the Reader API.
Summary
Remember to copy a private link to 1Password items, such as login information for accessing a website. Then include that as a Markdown link in Obsidian notes to reference that 1Password item without duplicating sensitive security credentials in your notes.