Documentation

Hopskip is a durable execution engine, in the same family as Temporal. You write a workflow as an ordinary async function. Hopskip records every step it takes in an event log, so if the process dies mid-run, the workflow resumes from where it left off instead of starting over.

Three design choices separate it from orchestrators built on task polling:

1. Sandboxed execution. Workflow code runs inside a Wasm runtime that Hopskip controls. Determinism is enforced at the sandbox boundary, not by lint rules and code review.
2. A log-structured, cryptographically verifiable event store. State is an append-only log with Merkle commitments, tiered from memory to object storage and queryable in place.
3. Push-based dispatch. Workers hold persistent bidirectional gRPC streams to the server. The server sees every task first, so retries and other resilience policies are declared server-side instead of written into each worker.

What you get

• Workflows are ordinary async functions. Mark the durable entry point and every await becomes a checkpoint. No base class to extend, no replay annotations, no ContinueAsNew.
• Millisecond replay. Memory snapshots every N events keep the cost of resuming a workflow constant, no matter how long it has been running.
• Verifiable history. Every event carries the SHA-256 of its predecessor and the OIDC identity of its trigger, forming a per-workflow Merkle Mountain Range. Any run’s history can be proven with an inclusion proof.
• SQL visibility, built in. The server projects the log into an embedded columnar store, so you can query live workflow state in plain SQL. No Elasticsearch.
• Polyglot, and proven. TypeScript, Python, Rust, Haskell, and Go are launch languages. A cross-SDK conformance suite runs every feature in all five with interchangeable histories: a history recorded by one SDK replays through any other.

Where to go next

If you want to	Read
Run your first workflow	Getting started
Understand the execution model	Durable execution
Know why replay is safe	Determinism & the sandbox
See what executes your code	Workflow modes
Pick an SDK	TypeScript · Python · Rust · Go · Haskell
See the whole system	Architecture

Status: draft 0.1. Hopskip is pre-1.0. The workflow ABI (hopskip:workflow@x) is frozen per version, but SDK ergonomics and the CLI are still moving. See Compatibility & versioning for what is stable today.