Orchestration
Akka Orchestration guides and controls long-running processes so that agents and services reliably reach their goals despite failures, delays, or runs that stretch from seconds to months. It gives you a durable execution engine for coordinating the steps of a business process, a multi-step agent plan, or a distributed transaction. You never write the retry loops, state machines, or recovery logic yourself.
Orchestration is the coordination layer of the platform. Where an individual agent decides what to do next, orchestration governs how that work is sequenced, retried, compensated, and resumed. It is exposed through the Workflow component in the SDK.
Why orchestration matters for agentic systems
Multi-agent and multi-step systems fail in ways that simple request/response services do not. A plan may call several tools, wait on a human approval, invoke an external API that times out, and then need to undo earlier work when a later step fails. Coordinating this correctly by hand means reinventing durable state, idempotency, retries, and rollback for every workflow.
Akka Orchestration provides these guarantees as first-class building blocks:
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Always completes — Workflows persist through crashes, restarts, and downtime. Once started, a workflow runs to completion or to a defined failure outcome; work is never silently abandoned.
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Exactly-once actions — Each step executes once and only once, preventing duplicate messages, repeated API calls, and corrupted downstream state caused by redundant writes.
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Instant recovery — After a failure, a workflow resumes from its last durable point, with no manual intervention and no lost progress.
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Reactive coordination — Workflows respond to events and data as they arrive, staying responsive under load while adapting to changing conditions.
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Safe evolution — Workflow logic and schema can change while instances are still in flight, so you can ship updates to long-running processes without disrupting them.
How the orchestration engine works
Durable, exactly-once execution
The workflow engine executes each step sequentially with strong consistency. State is made durable through event sourcing with periodic snapshots, so the exact position of every in-flight workflow survives process restarts and node failures. When a workflow resumes, it continues from where it left off rather than re-running completed steps.
External calls as workflow steps
Calls to external APIs, models, and services are modeled as native workflow steps. The engine applies built-in retry logic, flow control, and error handling to each call, so transient failures in downstream systems are absorbed by the orchestration layer instead of surfacing as workflow failures.
Error handling and compensation
Each step can define timeouts, retry policies, and recovery strategies. When a later step fails, compensation handlers reverse the effects of earlier completed steps. This is the saga pattern, and it lets a partially executed workflow unwind to a consistent state. This is what makes it safe to orchestrate distributed transactions across systems that have no shared transaction boundary.
Orchestration patterns
Akka Orchestration supports the range of coordination shapes that agentic and business processes require:
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Sequential plans — an ordered series of steps where each depends on the result of the previous one.
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Branching decisions — conditional paths chosen at runtime based on step results, model output, or external data.
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Human-in-the-loop checkpoints — pauses where a workflow waits, potentially for hours or days, on human approval or input before continuing, without holding resources.
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Dynamic agent goals — complex plans where the sequence of steps is determined as the workflow runs, letting an agent adapt its approach while the engine keeps every step durable and recoverable.
Where orchestration fits in the platform
Orchestration works together with the other components: Agents provide the reasoning for each step, Memory provides durable state that steps read from and write to, and Streaming provides the flow of events that workflows react to. Orchestration ties these together, turning individual agent actions into durable, long-running processes.