moss-langgraph 0.1.0

MOSS signing integration for LangGraph nodes

moss-langgraph

MOSS signing integration for LangGraph nodes.

Installation

pip install moss-langgraph

Usage

from langgraph.graph import StateGraph
from moss_langgraph import signed_node

def my_node(state):
    state["result"] = "computed"
    return state

# Create graph and add signed node
graph = StateGraph(dict)
graph.add_node("step", signed_node(my_node, "moss:flow:step"))

# After node executes, state["moss_envelope"] is populated

Verification

from moss import Subject

# After graph execution
result = graph.invoke({"input": "data"})
envelope = result["moss_envelope"]

# Verify the node's output
verify_result = Subject.verify(envelope)
assert verify_result.valid

Factory for Multiple Nodes

from moss_langgraph import SignedNodeFactory

# All nodes share the same subject
factory = SignedNodeFactory("moss:flow:pipeline")

graph.add_node("step1", factory.wrap(step1_fn))
graph.add_node("step2", factory.wrap(step2_fn))
graph.add_node("step3", factory.wrap(step3_fn))

Different Subjects per Node

graph.add_node("research", signed_node(research_fn, "moss:flow:research"))
graph.add_node("analyze", signed_node(analyze_fn, "moss:flow:analyze"))
graph.add_node("summarize", signed_node(summarize_fn, "moss:flow:summarize"))