@modelcontextprotocol/server-memory

Implements a knowledge graph data structure that persists conversational context and facts across multiple Claude interactions through an MCP server interface. The system stores entities, relationships, and contextual metadata in a graph format, allowing Claude to retrieve and reason over accumulated knowledge without re-sending full conversation history. Uses MCP's resource and tool protocols to expose memory operations as callable functions that Claude can invoke during reasoning.

Exposes the knowledge graph as an MCP resource that Claude can read and write through the Model Context Protocol's resource and tool interfaces. Implements MCP server lifecycle (initialization, request handling, resource listing) and serializes graph state into formats Claude can consume. Uses MCP's tool-calling mechanism to allow Claude to invoke memory operations (create entity, add relationship, query graph) as first-class functions with schema validation.

Provides APIs for Claude to create and manage nodes (entities) and edges (relationships) in the knowledge graph. Implements graph mutation operations that allow Claude to extract facts from conversations and persist them as structured entities with typed relationships. Uses a graph data model where entities have properties and relationships have semantic labels, enabling Claude to build domain-specific knowledge representations incrementally.

Implements query operations that allow Claude to retrieve relevant entities, relationships, and subgraphs from the knowledge graph to inject into its reasoning context. Supports entity lookup by ID/name, relationship traversal, and potentially graph pattern matching to find connected knowledge relevant to the current task. Results are serialized into natural language or structured formats that Claude can consume as additional context during inference.

Enables the knowledge graph to accumulate facts and context across multiple separate Claude conversations without requiring manual state management. The MCP server maintains persistent graph state between conversations, allowing Claude to reference and build upon knowledge from previous interactions. Implements conversation-scoped memory operations where Claude can query what it learned in prior turns and add new facts that persist for future conversations.

Implements the MCP server runtime that handles Claude client connections, request routing, and protocol compliance. Manages server initialization, resource discovery, tool registration, and graceful shutdown. Handles the bidirectional communication protocol between Claude and the memory server, including request/response serialization and error handling through MCP's standard message formats.