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2026-03-20T13:02:00.000Z Memex Chat - Obsidian Plugin I built for myself Memex Chat is an Obsidian plugin enabling vault conversations through Claude AI, leveraging proper context retrieval instead of simple keyword matching.
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Memex Chat is an Obsidian plugin enabling vault conversations through Claude AI, leveraging proper context retrieval instead of simple keyword matching.

Capabilities

The plugin provides these key features:

  • Semantic vault search: TF-IDF indexing across all notes without external APIs
  • Local embeddings: Optional offline semantic search using BGE Micro v2 (~22 MB model)
  • Hybrid search: When embeddings are enabled, TF-IDF keyword ranking and local semantic embeddings are combined via Reciprocal Rank Fusion (RRF) — neither score space needs normalization, and results are better than either engine alone. Falls back to TF-IDF-only while embeddings are still indexing.
  • Automatic context: Relevant notes automatically attached to queries before reaching Claude
  • @ mentions: Direct note references with autocomplete support
  • Active note command: "Memex Chat: Aktive Notiz als Kontext" opens a new thread pre-filled with the current note as explicit context, asking Claude to explain and connect it with other vault concepts
  • Context preview: View and edit included notes before sending
  • Related notes sidebar: Always-visible panel showing semantically similar notes, ranked by similarity, frontmatter links, and shared tags
  • Thread history: Chats saved as Markdown in your vault with inline renaming
  • Message actions: Copy assistant replies or save them as new notes
  • Source links: Answers display which notes provided context
  • Prompt buttons: Configurable header buttons extending Claude's system prompt (e.g., draft checking, monthly reviews); date-mode buttons retrieve notes by date range
  • System context file: Pin vault notes to the system prompt for persistent personal context
  • Manual installation: Download main.js, manifest.json, and styles.css from releases into .obsidian/plugins/memex-chat/, enable in Community Plugins, add Anthropic API key

Resources

Repository: https://github.com/svemagie/obsidian-memex-chat

Together with the Thinking in Public approach, this creates an active knowledge space rather than a passive archive.