GRAFOMEM CGR Capture MCP server

GRAFOMEM

The governed memory runtime for agents. Signed checkpoints, provable erasure, portable memory — a drop-in wrapper for your LangGraph checkpointer.

pip install grafomem langgraph-checkpoint-grafomem langgraph

from typing import TypedDict
from cryptography.hazmat.primitives.asymmetric import ed25519
from langgraph.graph import StateGraph, START, END
from langgraph.checkpoint.memory import MemorySaver
from grafomem_checkpoint import GrafomemSerializer, GrafomemCheckpointSaver

# ── the entire GRAFOMEM integration: an Ed25519 signing key, then wrap ANY
#    LangGraph checkpointer. Pass it to compile() as you already do. ──
priv = ed25519.Ed25519PrivateKey.generate()
saver = GrafomemCheckpointSaver(MemorySaver(serde=GrafomemSerializer(private_key=priv)))

# ── your ordinary LangGraph agent ──
class State(TypedDict):
    messages: list

def agent(state: State) -> State:
    return {"messages": state["messages"] + ["hello from the agent"]}

b = StateGraph(State); b.add_node("agent", agent)
b.add_edge(START, "agent"); b.add_edge("agent", END)
app = b.compile(checkpointer=saver)

cfg = {"configurable": {"thread_id": "user-42"}}
app.invoke({"messages": []}, cfg)

# signed, content-addressed checkpoint
tup = saver.get_tuple(cfg)
print("signed checkpoint hash:", tup.metadata["grafomem_content_hash"])

# cryptographic erasure receipt — proof the erasure transition occurred
saver.delete_thread("user

signed checkpoint hash: ecd0e28938738cc55b3c888f7449503fd586723a699e1d326d74cc0f154874f7
erasure receipt: LangGraphErasureReceipt(pre_state_hash='d9a16ef8…', post_state_hash='0e5751c0…',
                 scope='user-42', key_id='grafomem_checkpoint', timestamp='2026-…', signature=b'…')

(hashes and signature vary per run — each run generates a fresh key)

What just happened: every state transition your agent made was captured as a signed, content-addressed checkpoint — and when you deleted, you got a cryptographic receipt proving the erasure transition occurred. Memory your agents can move, merge, and prove they erased.

Why

Agent memory today is a JSON blob you have to trust. GRAFOMEM makes it evidence: every write signed, every fact content-addressed, every deletion receipted. When someone asks "what did your agent know, and when?" — you answer with proofs, not logs.

Two tiers, one system

• Working memory — fast, bounded context state for the agent loop.
• Durable facts (GMP) — governed, bi-temporal, signed facts with provenance. The GRAFOMEM Memory Protocol is an open spec with an executable conformance suite: a backend's capability counts as supported when it passes the test, not when the vendor says so.

→ Architecture overview

Integrations

• LangGraph — the quickstart above. → docs
• Claude / MCP — expose governed memory as MCP tools. → docs
• Reference server — a REST + MCP server (grafomem[server] extra); a hosted instance runs live at api.grafomem.com. → self-hosting docs

The bigger picture: verify the agent, not just the answer

Shortened. The full README is on GitHub.