OpenZync Python SDK

Python SDK for OpenZync — the open-source agent memory platform with persistent, queryable, graph-based memory for AI agents.

Installation

pip install openzync

Requires Python 3.11+.

Quick Start

from openzync import OpenZync

client = OpenZync(api_key="oz_live_your_api_key_here")

# Create a user
user = client.users.create(external_id="alice")
print(f"User: {user.name} ({user.id})")

# Ingest conversation messages
resp = client.memory.ingest(
    messages=[
        {"role": "user", "content": "Hi, I am Alice from Acme Corp."},
        {"role": "assistant", "content": "Hello Alice! How can I help you today?"},
    ],
)
print(f"Ingested {resp.episode_count} episodes")

# Search across memory
results = client.graph.search("Alice Acme Corp", types="episodes,facts")
for r in results:
    print(f"  - {r['content']}")

Client API

Sync (default)

from openzync import OpenZync

client = OpenZync(api_key="...")

# ── Memory ──
client.memory.ingest(messages=[...])
client.memory.get_context(query="...")
client.memory.delete()

# ── Facts ──
client.facts.add(facts=[...])

# ── Graph ──
for node in client.graph.nodes():
    print(node.name)
detail = client.graph.node_detail(node_id)
client.graph.delete_node(node_id)
for edge in client.graph.edges(subject_id):
    print(edge.type)
comms = client.graph.communities()
results = client.graph.search("query")

# ── Users ──
user = client.users.create(external_id="bob")
user = client.users.get(user_id)
user = client.users.update(user_id, name="New Name")
client.users.delete(user_id)
for user in client.users.list_iter():
    print(user["name"])

# ── Sessions ──
session = client.sessions.create(external_id="s1")
msgs = client.sessions.messages(session_id)
client.sessions.delete(session_id)

Async

import asyncio
from openzync import AsyncOpenZync

async def main():
    async with AsyncOpenZync(api_key="...") as client:
        resp = await client.memory.ingest(messages=[...])

asyncio.run(main())

Error Handling

from openzync import OpenZync
from openzync._errors import NotFoundError, RateLimitError

client = OpenZync(api_key="...")

try:
    user = client.users.get("non-existent-id")
except NotFoundError:
    print("User not found")
except RateLimitError:
    print("Rate limited — slow down")

Pagination

List endpoints return an iterator that auto-fetches subsequent pages:

# Iterate over all users (auto-paginated)
for user in client.users.list_iter():
    print(user["name"])

LangChain Integration

LangChain developers can use OpenZync as a drop-in memory provider, graph retriever, and tool set.

pip install "openzync[langchain]"

Chat Message History

Persist conversation history to OpenZync:

from openzync import OpenZync
from openzync.integrations.langchain import OZChatMessageHistory
from langchain_core.messages import HumanMessage

client = OpenZync(api_key="...")
history = OZChatMessageHistory(
    session_id="session-1",
    user_id="user-abc",
    client=client,  # accepts both sync and async clients
)

history.add_message(HumanMessage(content="Hello!"))
print(history.messages)

Memory

Use OZMemory as a standard LangChain BaseMemory inside chains:

from openzync import OpenZync
from openzync.integrations.langchain import OZMemory
from langchain_core.messages import HumanMessage, AIMessage

client = OpenZync(api_key="...")
memory = OZMemory(
    session_id="session-1",
    user_id="user-abc",
    client=client,
    return_messages=True,   # False returns string
    memory_key="history",   # key in memory_variables
)

memory.save_context({"input": "Hi"}, {"output": "Hello!"})
context = memory.load_memory_variables({})
# context["history"] — list of BaseMessage or str depending on return_messages

Graph Retriever

Use OZGraphRetriever as a LangChain retriever for RAG pipelines:

from openzync.integrations.langchain import OZGraphRetriever

retriever = OZGraphRetriever(
    user_id="user-abc",
    client=client,
    k=5,                    # max results
    types="episodes,facts", # filter by node type
    score_threshold=0.7,    # minimum relevance score
)

docs = retriever.invoke("What does Alice know about Acme Corp?")
for doc in docs:
    print(doc.page_content, doc.metadata)

Tool plugins

Expose OpenZync graph search and fact management as LangChain tools:

from openzync.integrations.langchain.tools.graph import GraphSearchTool
from openzync.integrations.langchain.tools.facts import AddFactsTool

tools = [
    GraphSearchTool(client=client),
    AddFactsTool(client=client),
]

# Use with LangGraph / ReAct agents
# agent = create_react_agent(model, tools)

Development

# Install with dev dependencies
pip install "openzync[dev]"

# Install everything (dev + langchain)
pip install "openzync[dev,langchain]"

# Run tests
pytest