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lore

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Semantic search MCP server for Claude Code conversations. Hybrid vector + keyword search across all your sessions, fully local.

lore

License: MITTypeScript

Semantic search across your Claude Code conversations.Find anything you've ever discussed -- across all projects, all sessions, any branch.

Features

  • Hybrid search (vector + keyword)Combines multilingual-e5-small embeddings with FTS5/BM25 via Reciprocal Rank Fusion. Finds results by meaning and exact terms.

  • Fully local, zero API keysEverything runs on your machine. ONNX Runtime for embedding, sqlite-vec for storage. No data leaves your device.

  • Background indexingIndex triggers return instantly. Monitor progress while you keep working. Search what's already indexed while the rest catches up.

  • Project-selectiveRegister only the projects you care about. Add or remove anytime. Unregistering deletes indexed data to keep things clean. Browsing your session inventory also makes it easy to spot stale or unnecessary sessions you may want to clean up.

  • Conversation-aware chunkingSplits by logical turns (user question + full assistant response chain), not arbitrary token windows. Handles tool-use chains, thinking blocks, and multi-step interactions correctly.

  • 100+ languagesKorean, Japanese, Chinese, English, and 90+ more. CJK-aware token estimation for accurate chunking.

Quick Start

Add to Claude Code

# No install needed — always runs latest version
claude mcp add -s user lore -- npx getlore

# Or for a single project only
claude mcp add -s project lore -- npx getlore

Add to OpenAI Codex CLI

# No install needed
codex mcp add lore -- npx getlore
Alternative: global install (faster startup, works offline) 
npm install -g getlore

# Then register with your tool:
claude mcp add -s user lore -- getlore   # Claude Code
codex mcp add lore -- getlore            # Codex CLI

# Manage your install:
getlore --version   # Check installed version
getlore update      # Update to latest

Usage

Once connected, the AI can use lore's tools directly:

You: "What did we discuss about auth refactoring last week?"

Claude: [calls lore search] Found 3 relevant conversations...
        In your "my-webapp" project on March 15, you decided to...

First time setup:

  1. Browse projects -- lore shows all your Claude Code projects
  2. Register -- pick which ones to index
  3. Index -- runs in background, takes ~15 seconds per project
  4. Search -- ask anything about past conversations

Tools

Tool Purpose
manage_projects Register/unregister projects for indexing
index Start background indexing. Modes: incremental (default), full (requires confirm: true), cancel
status Check indexing progress, ETA, skip reasons, DB health
search Semantic + keyword search across conversations
get_context Expand search results with surrounding conversation
list_sessions Browse indexed sessions by project

full mode requires confirm: true as a safety gate — the AI doesn't know about this parameter, so it has to ask you before triggering a destructive reindex.

Why This Exists

Claude Code stores every conversation as a JSONL transcript in ~/.claude/projects/. After a few weeks, you have hundreds of sessions across dozens of projects -- discussions about architecture decisions, debugging sessions, code reviews, and design explorations.

But there's no way to search through them. You can't ask "what approach did we take for the auth middleware?" or "which project had that database migration discussion?"

Existing tools either require cloud APIs, spawn zombie processes, or treat conversations as generic documents. lore is purpose-built for Claude Code sessions: it understands turn boundaries, tool-use chains, and thinking blocks. It runs entirely locally with zero dependencies beyond Node.js.

How It Works

~/.claude/projects/*/*.jsonl
        |
   JSONL Parser (extracts user/assistant messages, skips noise)
        |
   Turn-pair Chunker (groups by logical conversation turns)
        |
   Transformers.js (multilingual-e5-small, INT8 quantized, 384d)
        |
   sqlite-vec + FTS5 (hybrid vector + keyword storage)
        |
   Reciprocal Rank Fusion (combines both signals for ranking)

Storage: Single SQLite file at ~/.lore/lore.db with WAL mode for concurrent reads.

Config: Project registration stored in ~/.lore/config.json.

Configuration

Environment Variables

Variable Default Description
LORE_DIR ~/.lore Data directory
LORE_DB ~/.lore/lore.db Database path
CLAUDE_PROJECTS_DIR ~/.claude/projects Claude Code transcripts location
Performance

Measured on Apple Silicon (M-series):

Metric Value
Search latency 7-15ms
Index speed ~10 sessions/sec
First search (cold model load) ~5s
DB size ~0.1MB per 10 sessions
Model size (downloaded once) ~112MB
Troubleshooting

"No projects registered"

Run manage_projects with action list to see available projects, then add the ones you want.

Stale lock file

If indexing was interrupted, the lock file auto-cleans on next run (PID-based detection).

DB corruption

Delete ~/.lore/lore.db and re-index. Your source data (~/.claude/projects/) is never modified.

Development

git clone https://github.com/hyunjae-labs/lore.git
cd lore
npm install
npm run build
npm test          # 114 tests

Tech Stack

License

MIT

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