"Persistent" matching MCP connectors:

Engram Obsidian Memory SyncAOAuth

io.github.engram-app

Engram is a persistent, long-term memory layer for AI agents and assistants. Claude, ChatGPT, Grok, Cursor and any MCP client share one memory, stored as plain markdown notes: your knowledge base, second brain and AI context in one place. No extraction step: the memory is the note itself, so you can read exactly what your AI remembers and fix it. Edit your memory in Obsidian (real-time sync), the web app, or on your phone. Hybrid keyword + semantic search (RAG over your notes) finds exact strings like error messages, config keys and IDs. Remote MCP server over Streamable HTTP with OAuth 2.1; notes encrypted at rest. Https://engram.page https://youtu.be/rwnPeZ-8Lqo?is=NI-N7BduydGAiZlF https://github.com/engram-app/Engram

Penfield MemoryAOAuth

io.github.penfieldlabs

Persistent memory and knowledge graphs for AI agents. Hybrid search, context checkpoints, and more.

Persistent project context for xAI Grok. IANA-registered .faf format.

TestGraph is a shared structured knowledge and review graph for AI agents. Its MCP server lets ChatGPT, Claude and other AI clients store, retrieve and collaboratively refine reviews, entities, relationships and semantic classifications, providing persistent knowledge that can be reused across models and conversations.

shared AI-context layer for teams — persistent memory your agents search and update over MCP

Persistent cloud memory for Ai coding assistants. 33 MCP tools, 85% accuracy on LoCoMo benchmark. Semantic search, auto-skills, knowledge graph, quantum-safe encryption. Works with Claude Code, Cursor, Windsurf, and any MCP client.

Memwyre is an MCP-native persistent memory layer for AI agents, synchronizing context across Claude Code, Cursor, VS Code, and OpenClaw. Built with a high-precision retrieval architecture (dense vector search, BM25, and cross-encoder reranking), Memwyre achieves a benchmarked 73.1% accuracy on the Long-Context Memory (LoCoMo) benchmark. It provides secure, isolated knowledge vaults with dedicated tools (search_memwyre, save_memory, list_memories) to save and recall structured project decisions.

mcpOAuth

ai.atlaso

AI memory layer — one shared, persistent memory across every AI tool you connect.

Persistent semantic memory storage, associative recall, and recent memory index by namespace.

mcpOAuth

ai.butlerbrain

Persistent memory for AI assistants. Save once; recall from Claude, ChatGPT, or any MCP client.

Persistent memory for AI assistants: store, search, and connect knowledge across conversations.

Persistent memory, hybrid search and a goal graph for AI agents, over stdio or remote HTTP.

Hosted persistent memory with semantic search, importance and TTL for AI agents.

Team-synced persistent AI agents memory for Claude, Codex, Cursor, claude.ai, chatgpt.com... that is always current.

ContextBook is an open-source MCP server that gives AI tools a persistent, searchable context library. Store information as Books and Pages, retrieve exactly what's needed via natural-language semantic search - injected on demand, not pre-loaded. Works with Cursor, Claude, Windsurf, and any MCP-compatible client. Self-hostable, MIT licensed.

Ace MemoryBOAuth

io.github.rudedoggg

Persistent memory for AI agents. Semantic search, memory graph, W3C DID identity.

Universal persistent memory and knowledge retrieval layer for AI agents and LLMs.

The MCP gateway with an EU-hosted, persistent memory layer that shrinks your token bill.

Private persistent memory for Claude, ChatGPT & Gemini via MCP - semantic search, zero-code setup.

Stompy – AI Memory for Claude & MCP AgentsOAuth

ai.stompy

Persistent AI memory with semantic search, conflict detection, and ticketing.