MemPalace gives coding agents local verbatim memory with 96.6% recall on LongMemEval
thisguyknowsai · x · 2026-10-17
Open-source MemPalace (59.6K stars, MIT) gives AI coding agents searchable long-term memory across sessions — fully local, no cloud, no LLM, no API key.
Design: Most memory tools summarize chats, discarding whatever they deem unimportant. MemPalace keeps everything verbatim and organizes it like a memory palace: people and projects become wings, topics become rooms, original conversations live in drawers — so searches are scoped instead of running against one giant pile of text.
Key numbers and features:
- 96.6% R@5 raw on LongMemEval with zero LLM calls; 98.4% on a held-out set
- 47 MCP tools for reads, writes, knowledge graph and agent coordination
- Auto-save hooks for Claude Code, Codex CLI and Cursor; also works with Gemini CLI, Antigravity and local models
- Semantic search pulls exact conversations from months ago
Pro tip: Claude Code sessions expire after 30 days unless save hooks are wired — MemPalace backs them up automatically. Nothing leaves your machine unless you opt in.
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