docs/src/content/en/reference/workflows/run-methods/restart.mdx
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).
const run = await workflow.createRun()
const result = await run.start({ inputData: { value: 'initial data' } })
const restartedResult = await run.restart()
<PropertiesTable content={[ { name: 'requestContext', type: 'RequestContext', description: 'Request Context data to use when resuming', isOptional: true, }, { name: 'tracingContext', type: 'TracingContext', isOptional: true, description: "Tracing context for creating child spans and adding metadata. Automatically injected when using Mastra's tracing system.", properties: [ { parameters: [ { name: 'currentSpan', type: 'Span', isOptional: true, description: 'Current span for creating child spans and adding metadata. Use this to create custom child spans or update span attributes during execution.', }, ], }, ], }, { name: 'tracingOptions', type: 'TracingOptions', isOptional: true, description: 'Options for Tracing configuration.', properties: [ { parameters: [ { name: 'metadata', type: 'Record<string, any>', isOptional: true, description: 'Metadata to add to the root trace span. Useful for adding custom attributes like user IDs, session IDs, or feature flags.', }, ], }, { parameters: [ { name: 'requestContextKeys', type: 'string[]', isOptional: true, description: "Additional RequestContext keys to extract as metadata for this trace. Supports dot notation for nested values (e.g., 'user.id').", }, ], }, { parameters: [ { name: 'traceId', type: 'string', isOptional: true, description: 'Trace ID to use for this execution (1-32 hexadecimal characters). If provided, this trace will be part of the specified trace.', }, ], }, { parameters: [ { name: 'parentSpanId', type: 'string', isOptional: true, description: 'Parent 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.', }, ], }, { parameters: [ { name: 'tags', type: 'string[]', isOptional: true, description: 'Tags to apply to this trace. String labels for categorizing and filtering traces.', }, ], }, ], }, ]} />
<PropertiesTable content={[ { name: 'result', type: 'Promise<WorkflowResult<TState, TOutput, TSteps>>', description: 'A promise that resolves to the workflow execution result containing step outputs and status', }, { name: 'traceId', type: 'string', isOptional: true, description: 'The trace ID associated with this execution when Tracing is enabled. Use this to correlate logs and debug execution flow.', }, { name: 'spanId', type: 'string', isOptional: true, description: 'The root span ID associated with this execution when Tracing is enabled. Use this for span-level lookup and correlation.', }, ]} />