Pyrula

Workflows and agents that don't lose their place.

Pyrula runs durable workflows, pipelines, and LLM agents on a fast Rust-backed functional core. They survive crashes and pick up where they stopped.

Quickstart Open the console
● score_invoices.py ▶ Run
Run inspector run_01K9F8live
Execute·Checkpoint·Replay
One core, composable packages

Each package builds on the core.

Install only what you need. Every piece depends on the same Rust-backed functional core.

pyrula
Either · Option · Try · IList · IMap · serde
workflows
Append-only run streams. After a crash, a run replays and resumes at the point it stopped.
$ pip install pyrula-workflows
agents
Write agents with @agent and @tool. Stream turns over SSE and serve them over plain HTTP.
$ pip install pyrula-agents
kafka
A pure-Rust client (no librdkafka) that tracks the confluent-kafka API, with exactly-once (EOS) transactions.
$ pip install pyrula-kafka
pipelines
Exactly-once Kafka, Delta, and Postgres connectors. Batches are Arrow; the decode hot path is Rust.
$ pip install pyrula-pipelines
Why Pyrula

Built for jobs that have to finish.

Survives crashes

Every run is an append-only event stream. Status comes from the stream, so a restart picks up where it stopped instead of running again from the top.

Exactly-once over Kafka

An agent's output and its offset commit land in the same transaction. Read-process-write pipelines with no duplicates and nothing dropped.

Rust-backed core

A fast, typed functional core sits under every package: Either, Option, Try, immutable collections, and Rust serde.

Install what you need

Each piece ships as its own package built on the core. Start with the primitives and add workflows, agents, or Kafka when you need them.

Get started

Ship durable agents.

Read the quickstart, or open the cloud console to run and watch your agents.

Read the docs Star on GitHub