system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] Why didn’t the Ancient One protect all of their Sanctuaries with runes a.k.a the “Fundamentals of Magic” (note: very minor WandaVision spoiler included)

So in the last episode of WandaVision;

 >!Wanda tries to use magic in Agnes’ basement and Agnes scoffs at her and talks about how there are runes in each wall which are “basic protection spells” and how this knowledge is “the basic fundamentals of magic”. !<

Is there a reason why the Ancient One couldn’t have protected all of the Sanctuaries from Kaecilius and his zealots, with something similar?  Kaecilius was able to enter and leave these sanctuaries with impunity... 

Does Wizard Magic and Witch Magic work differently?
gpt
The Sorcerers of Kamar Taj work together, so a spell the prevents all but one Sorcerer from using their powers would severely hobble them.

- Strange and Mordo worked together to take on Kaecilius
- Wong and about a dozen students worked together to defend Hong Kong

It's also possible, though unlikely, that the Ancient One was unable to work Agatha's spell; Agatha doesn't seem to use the same sort of sigil-summoning magic as Kamar Taj (and neither does Wanda, for that matter).

Agatha and Wanda seem to use innate magical ability, whereas Kamar Taj *teaches* magic. In D&D terms, Agatha and Wanda are sorcerers, while Kamar Taj are wizards. They might operate under different rules.