# YAMS — Yet Another Memory System

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**Note**: Pre‑1.0 releases (v0.x) are not considered stable. Expect breaking changes until v1.0.

Persistent memory for LLMs and applications. Content‑addressed storage with deduplication, compression, semantic search, and full‑text indexing.

## What it does

- Content‑addressed storage (SHA‑256)
- Block‑level deduplication (Rabin fingerprinting)
- Compression: zstd and LZMA
- Search: full‑text (SQLite FTS5) + semantic (vector)
- Crash safety: WAL
- Fast and portable CLI + MCP server

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## Install

### Docker (simplest)

```bash
docker run --rm -it ghcr.io/trvon/yams:latest --version
```

### Build from Source (Meson)

```bash
# 1. Install dependencies (Debug)
conan install . -of build/debug -s build_type=Debug -b missing

# 2. Configure (first time)
meson setup build/debug \
  --prefix /usr/local \
  --native-file build/debug/build-debug/conan/conan_meson_native.ini

# 3. Build
meson compile -C build/debug

# 4. Install (optional)
sudo meson install -C build/debug
```

## Quick start

```bash
# init storage (non-interactive)
yams init --non-interactive

# store from stdin
echo "hello world" | yams add - --tags example

# search
yams search "hello" --json

# retrieve
yams list --format minimal --limit 1 | xargs yams get
```

## Versioning

YAMS provides comprehensive versioning through content-addressed storage. Every stored document gets a unique SHA-256 hash that serves as an immutable version identifier. You can track changes using metadata updates (`yams update`), organize versions with collections (`--collection release-v1.0`), and capture point-in-time states with snapshots (`--snapshot-id 2024Q4`).

## Docs

- Get Started: Installation, CLI, and prompts
- Usage: Search guide, vector search, tutorials
- API: REST/OpenAPI, MCP tools
- Architecture: search and vector systems
- Developer/Operations/Admin: build, deploy, configure, tune

Use the left navigation to browse all docs.

## Links

- SourceHut: https://sr.ht/~trvon/yams/
- GitHub (mirror): https://github.com/trvon/yams
- License: Apache-2.0