Scone

A memory engine, built the way engines should be built: a Rust library first, a single-binary CLI + daemon second, a self-hostable API third — all one core.

Scone ingests what you and your AI agents encounter (episodic memory), distills it into temporal facts that know when they were true (semantic memory), and returns budgeted, provenance-cited context on demand — fully offline by default, frontier models when you want them.

Status: M2 complete - episodic AND semantic engines work offline end-to-end. Episodic: add / search / status / doctor --rebuild, hybrid BM25+vector recall, local ONNX embeddings, SQLite as the single truth. Semantic: distill extracts temporal facts (subject-predicate-object with validity intervals) via a pluggable LLM (Ollama / OpenAI-compatible / Anthropic / none), contradictions close the old interval with a reason instead of deleting, and search --as-of answers "what did I believe in March". M3: scone mcp serves that memory to any MCP agent — memory_store, memory_recall, memory_facts_about, memory_forget — space-scoped and input-bounded, with immediate fact distillation when an LLM is configured. M4: scone serve is a self-hostable multi-user HTTP API (Bearer keys, each bound to one space), and scone-ffi ships a C ABI (include/scone.h) so any language can embed the engine. Measured on-device (Apple Silicon, criterion): recall over a 5k-chunk corpus in ~300 µs, 3.6 ms end-to-end including local query embedding, ingest at 2.9 ms/note - no datacenter involved.

Give Claude Code persistent memory:

cargo build --release
claude mcp add scone -- $PWD/target/release/scone --space myproject mcp

scone add --note "mark switched from pnpm to bun"
scone distill                      # facts, via your configured LLM
scone facts list --all             # history, with closure reasons
scone search "mark" --as-of 2026-03-15T00:00:00Z   # time travel

cargo build --release
scone add --note "changed the oil on the truck"
scone search "vehicle maintenance"     # semantic hit, fully offline
scone watch ~/notes --once             # ingest a directory
scone distill                          # extract temporal facts (LLM)
scone facts list --all                 # history, with closure reasons
scone search "tools" --as-of 2026-03-15T00:00:00Z   # time travel
scone export > memory.jsonl            # your memory is portable
scone mcp                              # persistent memory for agents
scone serve                            # self-hostable multi-user API

License: MIT