langchain-hs-graph

Graph-based stateful agent orchestration engine for langchain-hs

https://github.com/tusharad/langchain-hs#readme

Stackage Nightly 2026-11-14:0.0.6.2
Latest on Hackage:0.0.6.2

See all snapshots langchain-hs-graph appears in

MIT licensed by Tushar Adhatrao
Maintained by [email protected]
This version can be pinned in stack with:langchain-hs-graph-0.0.6.2@sha256:19e0fd1178532b9adc76a5c9010e84ef26fae72c66698d861ad214a405a79ec9,2833

Module documentation for 0.0.6.2

Used by 1 package in nightly-2026-11-14(full list with versions):
langchain-hs

langchain-hs-graph

Stateful agent orchestration and cyclic graph workflows for langchain-hs (LangGraph in Haskell).

langchain-hs-graph provides cyclic state machines, pure monoidal state reducers, in-memory STM checkpointers, persistent SQLite checkpointers, Human-in-the-Loop (HITL) interrupts, and multi-agent coordination patterns.

Key Primitives

  • StateGraph s m: Cyclic workflow builder with typed nodes, directed edges, and conditional branches.
  • StateReducer s: Pure binary state merge reducer (s -> s -> s) satisfying monoid associativity laws.
  • Checkpointers:
    • MemoryCheckpointer: In-memory thread-safe state persistence using STM TVar.
    • SQLiteCheckpointer: Persistent state checkpointer for production runs.
  • Human-in-the-Loop (HITL): Node interruption before execution, inspection/modification, and resumed execution via resumeGraph.
  • Parallel Nodes: Concurrent node evaluation using async.
  • Multi-Agent Architectures: Supervisor teams with capability routing, multi-agent debate, and majority voting.

Installation

build-depends: langchain-hs-graph >= 0.0.6.2 && < 0.0.7

License

MIT License. See LICENSE.

Changes

Changelog for langchain-hs-graph

All notable changes to this package will be documented in this file.

0.0.6.2 - 2026-11-14

Note: 0.0.6.1 was skipped globally after langchain-hs-ollama-v0.0.6.1.

  • Coordinated monorepo release alignment to 0.0.6.2.
  • Tightened langchain-hs-core dependency bound to >= 0.0.6.2 && < 0.0.7.
  • Added StateGraph event streaming via streamGraphEvents with typed GraphStreamEvent constructors (GraphStart, GraphNodeStart, GraphNodeChunk, GraphNodeEnd, GraphStateUpdate, GraphEnd).

0.0.6.0 - 2026-10-02

  • Updated bounds for GHC 9.12 and modern Stackage LTS releases.
  • Standalone stack configuration and verified test suite.

0.0.5.0 - 2026-09-10

  • Initial standalone Hackage release of langchain-hs-graph.
  • Cyclic graph orchestration engine (StateGraph s m).
  • Pure monoidal state merge reducers (StateReducer s).
  • In-memory STM TVar checkpointer and persistent SQLite checkpointer.
  • Human-in-the-Loop (HITL) interruption and resumption.
  • Parallel concurrent node execution via async.
  • Multi-Agent coordination: Supervisor teams, debate loops, and voting classifiers.
  • Graphviz DOT export for visual workflow inspection.