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OpenArmature

A workflow framework for LLM pipelines and tool-calling agents. Typed state, structural graph checks, and observability that doesn't require buy-in from every node.

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  • :material-shield-check:{ .lg .middle }   Workflows to agents, one engine

    Built for LLM-infused pipelines first. Tool-calling agents (cycle back to an LLM node) and pure deterministic ETL sit at the two ends of the same spectrum.

  • :material-content-save:{ .lg .middle }   Crash-safe by contract

    Synchronous checkpoint save after every node. Process dies mid-step, next invoke(resume_invocation=...) picks up from the last save with correlation_id preserved.

  • :material-eye:{ .lg .middle }   Pluggable observability

    Native OTelObserver emits GenAI semantic conventions any OTLP backend renders. Separate LangfuseObserver for the Langfuse destination. No vendor lock-in to a paid SaaS.

  • :material-graph:{ .lg .middle }   Bad graphs don't compile

    .compile() rejects six categories of structural error before invoke() is reachable: dangling edges, unreachable nodes, conflicting reducers, no entry, undeclared subgraph fields, multiple outgoing edges.

  • :material-arrow-split-vertical:{ .lg .middle }   Parallelism, formalized

    Fan-out with bounded concurrency and per-instance error policy. Parallel-branches runs N named sub-graphs. Both nest with attribution-correct observability.

  • :material-language-python:{ .lg .middle }   Async-first, LLM-agnostic

    asyncio-native throughout: every node, observer, and checkpointer is async. Use any LLM provider, any model, any external system. Drops directly into FastAPI lifespan hooks.

Open specification

OpenArmature is defined by a public, language-agnostic specification, not a Python-shaped opinion exported to other languages. Reference implementations share conformance fixtures, so behavior stays identical across languages, runtimes, and tooling stacks.

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