---
title: Logic Functions
description: Define server-side TypeScript functions with HTTP, cron, and database event triggers.
icon: "bolt"
---

Logic functions are server-side TypeScript functions that run on the Twenty platform. They can be triggered by HTTP requests, cron schedules, or database events — and can also be exposed as tools for AI agents.

<AccordionGroup>
<Accordion title="defineLogicFunction" description="Define logic functions and their triggers">

Each function file uses `defineLogicFunction()` to export a configuration with a handler and optional triggers.

```ts src/logic-functions/createPostCard.logic-function.ts
import { defineLogicFunction } from 'twenty-sdk/define';
import type { DatabaseEventPayload, ObjectRecordCreateEvent, CronPayload, RoutePayload } from 'twenty-sdk/define';
import { CoreApiClient, type Person } from 'twenty-client-sdk/core';

const handler = async (params: RoutePayload) => {
  const client = new CoreApiClient();
  const body = (params.body ?? {}) as { name?: string };
  const name = body.name ?? process.env.DEFAULT_RECIPIENT_NAME ?? 'Hello world';

  const result = await client.mutation({
    createPostCard: {
      __args: { data: { name } },
      id: true,
      name: true,
    },
  });
  return result;
};

export default defineLogicFunction({
  universalIdentifier: 'e56d363b-0bdc-4d8a-a393-6f0d1c75bdcf',
  name: 'create-new-post-card',
  timeoutSeconds: 2,
  handler,
  httpRouteTriggerSettings: {
    path: '/post-card/create',
    httpMethod: 'POST',
    isAuthRequired: true,
  },
  /*databaseEventTriggerSettings: {
    eventName: 'people.created',
  },*/
  /*cronTriggerSettings: {
    pattern: '0 0 1 1 *',
  },*/
});
```

Available trigger types:
- **httpRoute**: Exposes your function on an HTTP path and method **under the `/s/` endpoint**:
> e.g. `path: '/post-card/create'` is callable at `https://your-twenty-server.com/s/post-card/create`
- **cron**: Runs your function on a schedule using a CRON expression.
- **databaseEvent**: Runs on workspace object lifecycle events. When the event operation is `updated`, specific fields to listen to can be specified in the `updatedFields` array. If left undefined or empty, any update will trigger the function.
> e.g. `person.updated`, `*.created`, `company.*`

<Note>
You can also manually execute a function using the CLI:

```bash filename="Terminal"
yarn twenty exec -n create-new-post-card -p '{"key": "value"}'
```

```bash filename="Terminal"
yarn twenty exec -y e56d363b-0bdc-4d8a-a393-6f0d1c75bdcf
```

You can watch logs with:

```bash filename="Terminal"
yarn twenty logs
```
</Note>

#### Route trigger payload

When a route trigger invokes your logic function, it receives a `RoutePayload` object that follows the
[AWS HTTP API v2 format](https://docs.aws.amazon.com/apigateway/latest/developerguide/http-api-develop-integrations-lambda.html).
Import the `RoutePayload` type from `twenty-sdk`:

```ts
import { defineLogicFunction, type RoutePayload } from 'twenty-sdk/define';

const handler = async (event: RoutePayload) => {
  const { headers, queryStringParameters, pathParameters, body } = event;
  const { method, path } = event.requestContext.http;

  return { message: 'Success' };
};
```

The `RoutePayload` type has the following structure:

  | Property | Type | Description | Example |
  |----------|------|-------------|---------|
  | `headers` | `Record<string, string \| undefined>` | HTTP headers (only those listed in `forwardedRequestHeaders`) | see section below |
  | `queryStringParameters` | `Record<string, string \| undefined>` | Query string parameters (multiple values joined with commas)  | `/users?ids=1&ids=2&ids=3&name=Alice` -> `{ ids: '1,2,3', name: 'Alice' }`|
  | `pathParameters` | `Record<string, string \| undefined>` | Path parameters extracted from the route pattern | `/users/:id`, `/users/123` -> `{ id: '123' }` |
  | `body` | `object \| null` | Parsed request body (JSON) | `{ id: 1 }` -> `{ id: 1 }` |
  | `rawBody` | `string \| undefined` | Original UTF-8 request body, before JSON parsing. Useful for verifying HMAC-style webhook signatures (e.g. GitHub's `X-Hub-Signature-256`, Stripe). `undefined` when the runtime did not preserve it. | |
  | `isBase64Encoded` | `boolean` | Whether the body is base64 encoded | |
  | `requestContext.http.method` | `string` | HTTP method (GET, POST, PUT, PATCH, DELETE) | |
  | `requestContext.http.path` | `string` | Raw request path | |


#### forwardedRequestHeaders

By default, HTTP headers from incoming requests are **not** passed to your logic function for security reasons.
To access specific headers, list them in the `forwardedRequestHeaders` array:

```ts
export default defineLogicFunction({
  universalIdentifier: 'e56d363b-0bdc-4d8a-a393-6f0d1c75bdcf',
  name: 'webhook-handler',
  handler,
  httpRouteTriggerSettings: {
    path: '/webhook',
    httpMethod: 'POST',
    isAuthRequired: false,
    forwardedRequestHeaders: ['x-webhook-signature', 'content-type'],
  },
});
```

In your handler, access the forwarded headers like this:

```ts
const handler = async (event: RoutePayload) => {
  const signature = event.headers['x-webhook-signature'];
  const contentType = event.headers['content-type'];

  // Validate webhook signature...
  return { received: true };
};
```

<Note>
Header names are normalized to lowercase. Access them using lowercase keys (e.g., `event.headers['content-type']`).
</Note>

#### Exposing a function as an AI tool or workflow action

Logic functions can be exposed on two surfaces, each with its own trigger:

- **`toolTriggerSettings`** — makes the function discoverable by Twenty's AI features (chat, MCP, function calling). Uses standard JSON Schema, the format LLMs natively understand.
- **`workflowActionTriggerSettings`** — makes the function appear as a step in the visual workflow builder. Uses Twenty's rich `InputSchema` so the builder can render proper field editors, variable pickers, and labels.

A function can opt into one, the other, or both. They sit alongside `cronTriggerSettings`, `databaseEventTriggerSettings`, and `httpRouteTriggerSettings` — same pattern, same shape.

```ts src/logic-functions/enrich-company.logic-function.ts
import { defineLogicFunction } from 'twenty-sdk/define';
import { CoreApiClient } from 'twenty-client-sdk/core';

const handler = async (params: { companyName: string; domain?: string }) => {
  const client = new CoreApiClient();

  const result = await client.mutation({
    createTask: {
      __args: {
        data: {
          title: `Enrich data for ${params.companyName}`,
          body: `Domain: ${params.domain ?? 'unknown'}`,
        },
      },
      id: true,
    },
  });

  return { taskId: result.createTask.id };
};

export default defineLogicFunction({
  universalIdentifier: 'f47ac10b-58cc-4372-a567-0e02b2c3d479',
  name: 'enrich-company',
  description: 'Enrich a company record with external data',
  timeoutSeconds: 10,
  handler,
  toolTriggerSettings: {},
});
```

Key points:

- A function can mix surfaces — declare both `toolTriggerSettings` and `workflowActionTriggerSettings` to expose it in chat AND in the workflow builder.
- `toolTriggerSettings.inputSchema` and `workflowActionTriggerSettings.inputSchema` are both optional. When omitted, the manifest builder infers them from the handler source code (JSON Schema for the AI tool, Twenty's `InputSchema` for the workflow action). Provide one explicitly when you want richer typing — for example, with `FieldMetadataType`-aware fields like `CURRENCY` or `RELATION` for the workflow builder, or with `description` fields the AI agent can read:

```ts
export default defineLogicFunction({
  ...,
  toolTriggerSettings: {
    inputSchema: {
      type: 'object',
      properties: {
        companyName: {
          type: 'string',
          description: 'The name of the company to enrich',
        },
        domain: {
          type: 'string',
          description: 'The company website domain (optional)',
        },
      },
      required: ['companyName'],
    },
  },
});
```

<Note>
**Write a good `description`.** AI agents rely on the function's `description` field to decide when to use the tool. Be specific about what the tool does and when it should be called.
</Note>

</Accordion>
</AccordionGroup>

<Note>
**Install hooks** — pre-install and post-install handlers — share this runtime but are declared with their own define functions and don't take trigger settings. See [Install Hooks](/developers/extend/apps/config/install-hooks) for `definePreInstallLogicFunction` and `definePostInstallLogicFunction`.
</Note>

## Typed API clients (twenty-client-sdk)

The `twenty-client-sdk` package provides two typed GraphQL clients for interacting with the Twenty API from your logic functions and front components.

| Client | Import | Endpoint | Generated? |
|--------|--------|----------|------------|
| `CoreApiClient` | `twenty-client-sdk/core` | `/graphql` — workspace data (records, objects) | Yes, at dev/build time |
| `MetadataApiClient` | `twenty-client-sdk/metadata` | `/metadata` — workspace config, file uploads | No, ships pre-built |

<AccordionGroup>
<Accordion title="CoreApiClient" description="Query and mutate workspace data (records, objects)">

`CoreApiClient` is the main client for querying and mutating workspace data. It is **generated from your workspace schema** during `yarn twenty dev` or `yarn twenty build`, so it is fully typed to match your objects and fields.

```ts
import { CoreApiClient } from 'twenty-client-sdk/core';

const client = new CoreApiClient();

// Query records
const { companies } = await client.query({
  companies: {
    edges: {
      node: {
        id: true,
        name: true,
        domainName: {
          primaryLinkLabel: true,
          primaryLinkUrl: true,
        },
      },
    },
  },
});

// Create a record
const { createCompany } = await client.mutation({
  createCompany: {
    __args: {
      data: {
        name: 'Acme Corp',
      },
    },
    id: true,
    name: true,
  },
});
```

The client uses a selection-set syntax: pass `true` to include a field, use `__args` for arguments, and nest objects for relations. You get full autocompletion and type checking based on your workspace schema.

<Note>
**CoreApiClient is generated at dev/build time.** If you use it without running `yarn twenty dev` or `yarn twenty build` first, it throws an error. The generation happens automatically — the CLI introspects your workspace's GraphQL schema and generates a typed client using `@genql/cli`.
</Note>

#### Using CoreSchema for type annotations

`CoreSchema` provides TypeScript types matching your workspace objects — useful for typing component state or function parameters:

```ts
import { CoreApiClient, CoreSchema } from 'twenty-client-sdk/core';
import { useState } from 'react';

const [company, setCompany] = useState<
  Pick<CoreSchema.Company, 'id' | 'name'> | undefined
>(undefined);

const client = new CoreApiClient();
const result = await client.query({
  company: {
    __args: { filter: { position: { eq: 1 } } },
    id: true,
    name: true,
  },
});
setCompany(result.company);
```

</Accordion>
<Accordion title="MetadataApiClient" description="Workspace config, applications, and file uploads">

`MetadataApiClient` ships pre-built with the SDK (no generation required). It queries the `/metadata` endpoint for workspace configuration, applications, and file uploads.

```ts
import { MetadataApiClient } from 'twenty-client-sdk/metadata';

const metadataClient = new MetadataApiClient();

// List first 10 objects in the workspace
const { objects } = await metadataClient.query({
  objects: {
    edges: {
      node: {
        id: true,
        nameSingular: true,
        namePlural: true,
        labelSingular: true,
        isCustom: true,
      },
    },
    __args: {
      filter: {},
      paging: { first: 10 },
    },
  },
});
```

#### Uploading files

`MetadataApiClient` includes an `uploadFile` method for attaching files to file-type fields:

```ts
import { MetadataApiClient } from 'twenty-client-sdk/metadata';
import * as fs from 'fs';

const metadataClient = new MetadataApiClient();

const fileBuffer = fs.readFileSync('./invoice.pdf');

const uploadedFile = await metadataClient.uploadFile(
  fileBuffer,                                         // file contents as a Buffer
  'invoice.pdf',                                      // filename
  'application/pdf',                                  // MIME type
  '58a0a314-d7ea-4865-9850-7fb84e72f30b',            // field universalIdentifier
);

console.log(uploadedFile);
// { id: '...', path: '...', size: 12345, createdAt: '...', url: 'https://...' }
```

| Parameter | Type | Description |
|-----------|------|-------------|
| `fileBuffer` | `Buffer` | The raw file contents |
| `filename` | `string` | The name of the file (used for storage and display) |
| `contentType` | `string` | MIME type (defaults to `application/octet-stream` if omitted) |
| `fieldMetadataUniversalIdentifier` | `string` | The `universalIdentifier` of the file-type field on your object |

Key points:
- Uses the field's `universalIdentifier` (not its workspace-specific ID), so your upload code works across any workspace where your app is installed.
- The returned `url` is a signed URL you can use to access the uploaded file.

</Accordion>
</AccordionGroup>


<Note>
  When your code runs on Twenty (logic functions or front components), the platform injects credentials as environment variables:

  - `TWENTY_API_URL` — Base URL of the Twenty API
  - `TWENTY_APP_ACCESS_TOKEN` — Short-lived key scoped to your application's default function role

  You do **not** need to pass these to the clients — they read from `process.env` automatically. The API key's permissions are determined by the role referenced in `defaultRoleUniversalIdentifier` in your `application-config.ts`.
</Note>
