# Settings (Config page)

The **Config** page holds instance-wide settings. It is admin-only: what an admin changes here applies to every user of the instance.

Each setting is saved individually with its own **Save** button (a few, like the language, save as soon as they are changed).

## Interface

- **Language** — the default interface language for the whole instance. Each user can override it on their own profile page.

## Background agents — not here

The settings for the background agents (TIC, the two memory lints) are **not** on this page. Each one is configured on its own tab of the **System agents** page, next to that agent's run history — see [system-agents.md](system-agents.md).

They are still admin-only, and still instance-wide. They simply live where their run log is, because "why did this agent do nothing last night?" is usually answered half by the schedule and half by the log.

## Compaction

When a conversation grows too large, the oldest messages are automatically summarised so the context stays within limits. The summary replaces those messages in future turns while the most recent ones are kept verbatim.

- **Compaction model** — the model used to write those summaries, for the whole instance. Summarising is a simple writing task, so a cheap, fast model is usually the right choice — there is no reason to spend premium-model tokens on it. Leave it empty for automatic selection (by the `compaction.strength` value in `config.yml`, or the instance's default priority order). If the chosen model is later deleted, compaction silently falls back to automatic selection.

## Developer

- **Debug mode** — shows extra technical diagnostics in the interface.