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---
title: Übersicht
description: Serverseitiges TypeScript, das innerhalb von Twenty ausgeführt wird – ausgelöst durch HTTP-Routen, Cron-Zeitpläne, Datenbankereignisse, KI-Tools oder Workflow-Aktionen.
icon: bolt
---
Die **Logikschicht** einer Twenty-App ist der Code, der *ausgeführt wird* – serverseitige TypeScript-Handler, die auf HTTP-Anfragen, Cron-Zeitpläne und Datensatzänderungen reagieren; KI-Skills und -Agenten, die innerhalb des Workspaces leben; und OAuth-Verbindungen, die es Ihren Funktionen ermöglichen, im Namen eines Benutzers in Drittanbieterdiensten zu agieren.
```text
┌─ HTTP route ──┐
│ Cron schedule │
│ Database event │ ┌────────────────────┐
triggers ─┤ AI tool call ├─────▶│ Logic function │
│ Workflow action │ │ (your handler) │
│ Manual exec │ └────────────────────┘
└────────────────────┘ │
▼
┌────────────────────────────┐
│ Twenty API (records) │
│ Third-party API │
│ (via Connection token) │
└────────────────────────────┘
```
## In diesem Abschnitt
<CardGroup cols={2}>
<Card title="Logikfunktionen" icon="bolt" href="/l/de/developers/extend/apps/logic/logic-functions">
Der zentrale Baustein – Auslösertypen, Payloads und der typisierte API-Client.
</Card>
<Card title="Skills & Agenten" icon="robot" href="/l/de/developers/extend/apps/logic/skills-and-agents">
Wiederverwendbare Anweisungen für KI-Agenten und Assistenten mit benutzerdefinierten System-Prompts.
</Card>
<Card title="Verbindungen" icon="plug" href="/l/de/developers/extend/apps/logic/connections">
OAuth-Anmeldedaten, die Ihre App für Dienste von Drittanbietern verwaltet – Linear, GitHub, Slack und mehr.
</Card>
<Card title="Key-Value-Store" icon="database" href="/l/de/developers/extend/apps/logic/key-value-store">
Zustand zwischen Ausführungen von Logikfunktionen beibehalten — Caches, Cursor und arbeitsbereichsübergreifende Claims.
</Card>
<Card title="Hintergrundjobs" icon="layer-group" href="/l/de/developers/extend/apps/logic/background-jobs">
Reihen Sie die Ausführung einer Logikfunktion in die Warteschlange der Worker ein, um das Timeout je Ausführung zu umgehen.
</Card>
</CardGroup>
## Auslösertypen im Überblick
Eine Logikfunktion wählt einen oder mehrere Auslöser – jeder Eintrag unten ist ein eigenes Feld auf `defineLogicFunction()`:
| Auslöser | Wann sie ausgeführt wird | Einstellung |
| --------------------- | ------------------------------------------------------------------ | ------------------------------- |
| **HTTP-Route** | Eine Anfrage erreicht Ihren `/s/\<path>`-Endpunkt | `httpRouteTriggerSettings` |
| **Cron** | Ein CRON-Ausdruck trifft zu | `cronTriggerSettings` |
| **Datenbankereignis** | Ein Workspace-Datensatz wird erstellt, aktualisiert oder gelöscht | `databaseEventTriggerSettings` |
| **KI-Tool** | Eine Twenty-KI-Funktion entscheidet sich, Ihre Funktion aufzurufen | `toolTriggerSettings` |
| **Workflow-Aktion** | Ein Workflow-Schritt ruft Ihre Funktion auf | `workflowActionTriggerSettings` |
Funktionen werden in isolierten Node.js-Prozessen in einer Sandbox ausgeführt und greifen über einen typisierten API-Client, der auf die in [`defineApplication()`](/l/de/developers/extend/apps/config/application) deklarierte Rolle beschränkt ist, auf den Workspace zu.
<Note>
**Installations-Hooks** – Code, der vor oder nach der Installation ausgeführt wird – teilen sich diese Laufzeitumgebung, verwenden jedoch eigene Define-Funktionen und befinden sich unter [Config → Install Hooks](/l/de/developers/extend/apps/config/install-hooks).
</Note>