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

# workflows.WithSpan

```go theme={"system"}
func WithSpan(
    ctx context.Context,
    name string,
    f func(ctx context.Context) error,
) error
```

Wrap a function with a [tracing span](https://docs-old.tilebox.com/workflows/run-and-inspect/tracing.md) 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*

The task execution context.

**name** `string` *required*

The name of the span.

**f** `func(context.Context) error` *required*

The function to wrap.

## Returns

The error returned by `f`, if any.

```go Go theme={"system"}
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
}
```


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