You like Obsidian? Your LLM will love it too.

Memex: Vannevar Bush's 1945 concept of a "memory extender" - a device for storing and retrieving personal knowledge. The conceptual ancestor of personal wikis and second brains.

Semantic search and wikilink graph traversal for markdown vaults. Uses any sentence-transformers model. Point it at your Obsidian vault (or any markdown folder).

uvx memex-md --help

or

uv tool install memex-md

If installed, you can run memex directly, or via the alias mx:

mx vault:add personal ~/notes ~/journal
mx search "How does the auth flow handle token refresh?" -v personal
mx explore auth personal

For a memex skill, see my agent workflows.

A vault is a named collection of directories. Each vault has its own embedding model and SQLite index (~/.local/share/memex-md/<vault-name>/index.db).

The index contains:

• Embeddings for semantic similarity (default: embeddinggemma-300m)
• Wikilink graph for backlink/outlink queries
• Extracted frontmatter (aliases, tags)

Indexing is incremental — on each command, only files with changed mtimes are re-indexed. Hidden directories (.obsidian, .trash, .git, etc.) are excluded.

Note: Initial indexing requires embedding computation. Example: ~3800 notes took ~7 minutes on an RTX 3070 Ti.

Vaults are configured via CLI. Config lives at ~/.config/memex/config.toml.

mx vault:add personal ~/notes ~/journal
mx vault:add work ~/work-docs --model some/other-model
mx vault:list
mx vault:info personal
mx vault:remove personal --path ~/journal   # remove one path
mx vault:remove work                        # remove entire vault

Re-add a vault with --model to change its embedding model (triggers re-embedding). Use --model none to disable semantic search (wikilink navigation only).

mx search "How does the auth flow handle token refresh?" -v personal
mx search "What approaches did we consider for caching?" -v work --full

Embeds the query and ranks indexed notes by cosine distance. Natural language questions of a few sentences tend to work well.

mx explore auth personal
mx explore docs/api-design work --full

Shows a note's outlinks ([[wikilinks]]), backlinks, and semantically similar notes.

note_path can be a title (auth) or path (docs/auth.md). Titles must be unique in the vault.

mx rename old-name new-name personal
mx rename docs/guide manual work

Renames a note file and updates all [[wikilinks]] pointing to it. Handles path links, title links, aliases, and heading refs. Ambiguous links (multiple files share a name) are skipped with warning.

mx index
mx index -v personal

Trigger indexing. Runs automatically before search/explore.

uv sync
make check          # ruff + ty
make test           # pytest
make release-patch  # 1.0.0 -> 1.0.1, tag, push
make release-minor  # 1.0.0 -> 1.1.0
make release-major  # 1.0.0 -> 2.0.0