synap-langgraph

Synap memory integration for LangGraph.

Install

pip install synap-langgraph

Requires langgraph>=1.0, maximem-synap>=0.2.0.

What's in the box

• SynapStore — implements LangGraph's BaseStore for cross-thread long-term memory. Semantic search via store.search(namespace, query=...) routes to sdk.fetch(...), so your graph nodes get Synap-powered recall out of the box.

• SynapCheckpointSaver — implements BaseCheckpointSaver with best-effort fuzzy retrieval. Checkpoint writes succeed durably; reads use sdk.fetch which is semantic-search shaped rather than exact KV. Use for observability/audit and demo flows. For production checkpoint durability, pair with SqliteSaver / PostgresSaver.

• create_synap_node — re-exported from synap-langchain for users who discovered our LangGraph support through the LangChain package. This is the canonical home.

Quickstart

from langgraph.graph import StateGraph, START, END
from maximem_synap import MaximemSynapSDK
from synap_langgraph import SynapStore, SynapCheckpointSaver

sdk = MaximemSynapSDK(api_key="sk-...")

store = SynapStore(sdk, user_id="alice", customer_id="acme")
saver = SynapCheckpointSaver(sdk, user_id="alice", customer_id="acme")

graph = StateGraph(MyState)
# ... add nodes / edges ...
app = graph.compile(checkpointer=saver, store=store)

# Store usage inside a node:
async def remember(state, runtime):
    await runtime.store.aput(
        ("alice", "preferences"),
        "language",
        {"value": "English"},
    )

Error policy

• Writes (SynapStore.put, SynapCheckpointSaver.put, put_writes) surface SDK failures as SynapIntegrationError. Silent drops would hide ingestion outages.
• Reads (get, search, get_tuple, list) degrade gracefully — they log at ERROR and return None/[] rather than crashing the graph.
• Deletes (SynapStore.delete, SynapCheckpointSaver.delete_thread) warn once and no-op — Synap has no public delete API.

When to use which checkpointer

Cross-thread long-term memory (BaseStore) maps cleanly to Synap — use SynapStore as your default.