Grail Pattern Manager

Example Use Cases

• 1

  Find reusable code patterns semantically rather than by keyword across a multi-language codebase.

• 2

  Store, retrieve, and apply code templates or idioms programmatically via MCP tools.

• 3

  Index pattern content into a vector store and perform semantic ranking/reranking for high-quality results.

Description

Grail is an AI-powered pattern management MCP server that stores code patterns with vector embeddings, enabling semantic search and retrieval. It exposes MCP tools (store, search, get, update, delete, apply, extract) and integrates with Claude Code, a CLI, and a Reflex UI for pattern exploration and application. The architecture uses SQLite for metadata, ChromaDB for vector storage, and optional reranking via a reranker API; it is open-source (MIT) and designed to streamline pattern discovery across languages and projects.