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---
title: Vue d'ensemble
description: TypeScript côté serveur qui s’exécute dans Twenty — déclenché par des routes HTTP, des planifications CRON, des événements de base de données, des outils d’IA ou des actions de flux de travail.
icon: bolt
---
La **couche logique** d’une application Twenty est le code qui *s’exécute* — des gestionnaires TypeScript côté serveur qui réagissent aux requêtes HTTP, aux planifications CRON et aux modifications d’enregistrements ; des compétences et des agents d’IA qui résident dans l’espace de travail ; et des connexions OAuth qui permettent à vos fonctions d’agir au nom d’un utilisateur dans des services tiers.
```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) │
└────────────────────────────┘
```
## Dans cette section
<CardGroup cols={2}>
<Card title="Fonctions logiques" icon="bolt" href="/l/fr/developers/extend/apps/logic/logic-functions">
Le bloc de construction principal — types de déclencheurs, charges utiles et client API typé.
</Card>
<Card title="Compétences et agents" icon="robot" href="/l/fr/developers/extend/apps/logic/skills-and-agents">
Instructions d’agent IA réutilisables et assistants avec invites système personnalisées.
</Card>
<Card title="Connexions" icon="plug" href="/l/fr/developers/extend/apps/logic/connections">
Identifiants OAuth détenus par votre application pour des services tiers — Linear, GitHub, Slack, et plus encore.
</Card>
<Card title="Stockage clé-valeur" icon="database" href="/l/fr/developers/extend/apps/logic/key-value-store">
Conservez l’état entre les exécutions de fonctions logiques — caches, curseurs et revendications inter-espaces de travail.
</Card>
<Card title="Tâches en arrière-plan" icon="layer-group" href="/l/fr/developers/extend/apps/logic/background-jobs">
Mettez en file d’attente l’exécution d’une fonction logique sur les workers afin de contourner la limite de temps par exécution.
</Card>
</CardGroup>
## Aperçu des types de déclencheurs
Une fonction logique choisit un ou plusieurs déclencheurs — chaque entrée ci-dessous est un champ distinct sur `defineLogicFunction()`:
| Déclencheur | Moment d’exécution | Paramètre |
| -------------------------------- | ---------------------------------------------------------------------------- | ------------------------------- |
| **Route HTTP** | Une requête atteint votre point de terminaison `/s/\<path>` | `httpRouteTriggerSettings` |
| **Cron** | Une expression CRON correspond | `cronTriggerSettings` |
| **Événement de base de données** | Un enregistrement de l’espace de travail est créé, mis à jour ou supprimé | `databaseEventTriggerSettings` |
| **Outil IA** | Une fonctionnalité IA de Twenty décide d’appeler votre fonction | `toolTriggerSettings` |
| **Action de flux de travail** | Une étape de flux de travail invoque votre fonction | `workflowActionTriggerSettings` |
Les fonctions s’exécutent dans un environnement isolé dans des processus Node.js sandboxés et accèdent à l’espace de travail via un client API typé, limité au rôle déclaré sur [`defineApplication()`](/l/fr/developers/extend/apps/config/application).
<Note>
Les **hooks au moment de l’installation** — du code qui s’exécute avant ou après l’installation — partagent ce runtime mais utilisent leurs propres fonctions define et se trouvent sous [Config → Install Hooks](/l/fr/developers/extend/apps/config/install-hooks).
</Note>