processfork-langgraph 1.0.0

ProcessFork checkpointer for LangGraph — full four-layer snapshots at every node boundary.

processfork-langgraph

ProcessFork checkpointer for LangGraph. Full four-layer snapshots at every node boundary, not just LangGraph's state dict.

Install

pip install "processfork-langgraph[langgraph]"

Use

from langgraph.graph import StateGraph
from processfork_langgraph import ProcessForkCheckpointer

graph = StateGraph(MyState).compile(
    checkpointer=ProcessForkCheckpointer(store="~/.processfork"),
)

graph.invoke({"input": "go"}, config={"configurable": {"thread_id": "demo"}})

The checkpointer surface mirrors langgraph.checkpoint.BaseCheckpointSaver so existing code works unchanged. Each checkpoint is now a real ProcessFork image: model + cache + world + effects + trace.

Forking a thread

from processfork_langgraph import fork_thread

forks = fork_thread(graph, thread_id="demo", n=12, explore="try alternatives")
for cid in forks:
    print(cid)

fork_thread uses pf-merge's manifest-level fork: each branch points at the same layer blobs (CoW; no copy) but has a unique fingerprint and a single parents = [<source>] entry.

See agent_docs/integration-langgraph.md for the full spec.