# Run.restart()

The `.restart()` method restarts an active workflow run that lost connection to the server, allowing you to continue execution from the moment it lost connection (the last active step).

## Usage example

```typescript
const run = await workflow.createRun();

const result = await run.start({ inputData: { value: "initial data" } });

const restartedResult = await run.restart();
```

## Parameters

**requestContext?:** (`RequestContext`): Request Context data to use when resuming

**tracingContext?:** (`TracingContext`): currentSpan?:SpanCurrent span for creating child spans and adding metadata. Use this to create custom child spans or update span attributes during execution.

**tracingOptions?:** (`TracingOptions`): metadata?:Record\<string, any>Metadata to add to the root trace span. Useful for adding custom attributes like user IDs, session IDs, or feature flags.requestContextKeys?:string\[]Additional RequestContext keys to extract as metadata for this trace. Supports dot notation for nested values (e.g., 'user.id').traceId?:stringTrace ID to use for this execution (1-32 hexadecimal characters). If provided, this trace will be part of the specified trace.parentSpanId?:stringParent span ID to use for this execution (1-16 hexadecimal characters). If provided, the root span will be created as a child of this span.tags?:string\[]Tags to apply to this trace. String labels for categorizing and filtering traces.

## Returns

**result:** (`Promise<WorkflowResult<TState, TOutput, TSteps>>`): A promise that resolves to the workflow execution result containing step outputs and status

**traceId?:** (`string`): The trace ID associated with this execution when Tracing is enabled. Use this to correlate logs and debug execution flow.

## Related

- [Workflows overview](https://mastra.ai/docs/workflows/overview)
- [Restart workflows](https://mastra.ai/docs/workflows/overview)
- [Workflow.createRun()](https://mastra.ai/reference/workflows/workflow-methods/create-run)