# workflows.WithSpan

```go
func WithSpan(
    ctx context.Context,
    name string,
    f func(ctx context.Context) error,
) error
```

Wrap a function with a [tracing span](/docs/workflows/run-and-inspect/tracing) using the current runner's tracer.

Use `WithSpan` inside a task `Execute` method. If the context is not a task execution context, the function runs without creating a span.

## Parameters

**ctx**

`context.Context`

required: true

The task execution context.

**name**

`string`

required: true

The name of the span.

**f**

`func(context.Context) error`

required: true

The function to wrap.

## Returns

The error returned by `f`, if any.

```go title="Go"
import (
    "context"
    "fmt"

    "github.com/tilebox/tilebox-go/workflows/v1"
)

type ProcessScene struct{}

func (t *ProcessScene) Execute(ctx context.Context) error {
    err := workflows.WithSpan(ctx, "write-output", func(ctx context.Context) error {
        // Write output here.
        return nil
    })
    if err != nil {
        return fmt.Errorf("failed to write output: %w", err)
    }

    return nil
}
```