# ContextTrimmingMode

What happens when an interaction's conversation no longer fits the model's context window.

**Kind:** a string enum, used in requests and responses.

## Values

| Value | Description |
|---|---|
| `"None"` | Nothing until the conversation reaches the model's hard limit; then it is shortened just enough to be sent. |
| `"Automatic"` | The conversation is shortened once it passes the target share of the window: large tool results first, then the oldest turns in the middle, with a notice that it was trimmed. |
| `"Aggressive"` | Accepted, and trims as Automatic does. |
| `"FailOnOverflow"` | No trimming: a conversation that no longer fits makes the run fail, instead of going on without part of it. |

New values can appear, so treat one you don't know as "something else", not as an error.

## Where it's used

- Inside [`InteractionContextSettings`](https://docs.maitento.com/reference/types/interaction-context-settings.md)