> ## Documentation Index
> Fetch the complete documentation index at: https://docs.tilebox.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Task

```go theme={"system"}
type Task interface{}
```

Base interface for Tilebox workflows [tasks](/workflows/concepts/tasks).
It doesn't need to be identifiable or executable, but it can be both (see below).

## Methods

```go theme={"system"}
Task.Execute(ctx context.Context) error
```

The entry point for the execution of the task.
If not defined, the task can't be registered with a task runner but can still be submitted.

```go theme={"system"}
Task.Identifier() TaskIdentifier
```

Provides a user-defined task identifier.
The identifier is used to uniquely identify the task and specify its version.
If not defined, the task runner will generate an identifier for it using reflection.

## JSON-serializable task

```go theme={"system"}
type SampleTask struct {
	Message      string
	Depth        int
	BranchFactor int
}
```

Optional task [input parameters](/workflows/concepts/tasks#input-parameters), defined as struct fields.
Supported types are all types supported by [json.Marshal](https://pkg.go.dev/encoding/json#Marshal).

## Protobuf-serializable task

```go theme={"system"}
type SampleTask struct {
	examplesv1.SpawnWorkflowTreeTask
}
```

Task can also be defined as a protobuf message.
An example using task protobuf messages can be found [here](https://github.com/tilebox/tilebox-go/tree/main/examples/sampleworkflow).

<RequestExample>
  ```go Go theme={"system"}
  package helloworld

  import (
  	"context"
  	"fmt"
  	"github.com/tilebox/tilebox-go/workflows/v1"
  )

  type MyFirstTask struct{}

  func (t *MyFirstTask) Execute(ctx context.Context) error {
  	fmt.Println("Hello World!")
  	return nil
  }

  func (t *MyFirstTask) Identifier() workflows.TaskIdentifier {
  	return workflows.NewTaskIdentifier("tilebox.workflows.MyTask", "v3.2")
  }

  type MyFirstParameterizedTask struct {
  	Name    string
  	Greet   bool
  	Data    map[string]string
  }

  func (t *MyFirstParameterizedTask) Execute(ctx context.Context) error {
  	if t.Greet {
  		fmt.Printf("Hello %s!\n", t.Name)
  	}
  	return nil
  }
  ```
</RequestExample>