Knowledge graphs with expiration dates for every fact

What it does

Graphiti constructs and queries context graphs—temporal knowledge graphs where every entity, relationship, and fact carries a validity window. When new data arrives, old facts are invalidated rather than erased, preserving a queryable history of how truth evolved. It targets AI applications where data changes constantly and agents need to know not just what is true, but what was true at 2:00 PM last Thursday.

The interesting bit

The framework autonomously assembles this structure from raw unstructured or structured episodes, maintaining full provenance back to source data. You can enforce a rigid ontology via Pydantic models or let the schema emerge organically from the data—a flexibility that most static GraphRAG implementations do not offer.

Key highlights

• Bi-temporal edge tracking: every fact records when it became true and when it was superseded.
• Hybrid retrieval combines semantic embeddings, BM25 keyword search, and graph traversal to keep query latency sub-second.
• Incremental ingestion updates the graph immediately as episodes arrive, avoiding batch recomputation.
• Pluggable graph backends include Neo4j, FalkorDB, Kuzu, and Amazon Neptune.
• An optional MCP server exposes temporal graph memory to Claude, Cursor, and other MCP-compatible clients.

Caveats

• The framework defaults to OpenAI and works best with LLMs that support strict Structured Output; the README warns that smaller or alternative models can fail schema validation during ingestion.
• This is strictly self-hosted infrastructure: you supply the graph database, user management, and observability. There is no managed dashboard.
• Ingestion concurrency is intentionally throttled by default to avoid LLM rate limits, so initial throughput may feel conservative until tuned.

Verdict

A strong fit for teams building long-running agents or event-driven analytics over messy, evolving data. If you want a turnkey, managed memory platform with SLAs and a web dashboard, the commercial Zep product is the intended alternative.