Pilot: Prompt caching › Ep 5
Ep 5 · What breaks the cache
Length 1:00Today's goal: What breaks the prompt cache?
What you'll learn
- Switching models is a miss, even within the same family: the cache belongs to the provider and the model.
- Changing reasoning effort, or turning a skill or MCP server on or off, is a miss too. Turn it back within the time to live and it's a hit.
- Editing
AGENTS.mddidn't cause a miss in the demo, because Copilot only reads it when a new session starts. - A miss is rarely total: the chunks before the change can still be used.
Sources
- Burke Holland, “Your AI credits are vanishing - here's the fix” (YouTube): the “what breaks the cache” demos, on Copilot with OpenAI models