# 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 (event triage, 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

Compaction summarises the older part of a conversation so the context stays within limits: the summary replaces those messages in future turns, while the most recent ones are kept verbatim.

It runs **on request, not on its own**. Type `/compact` in the chat whenever a conversation has grown long and you want it condensed. Nothing is summarised until you ask, so a conversation keeps its full history — which is also what lets the model provider reuse its cache of the conversation instead of re-reading it from scratch every message.

(An admin can arm an automatic pass by setting `compaction.threshold_tokens` in `config.yml`; it is off in the shipped configuration.)

- **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.