Tolaria
Canonical version: Tolaria.
Tolaria is a free, open-source desktop app for managing markdown knowledge bases, created by Luca Rossi (author of the Refactoring newsletter). Positioned as "a second brain for the AI era", it stores everything as plain Markdown files with YAML frontmatter on disk, ships a block-based editor with Bidirectional Links and slash commands, integrates Git for version control and sync, and exposes a Model Context Protocol (MCP) server so Claude Code can read and write the vault directly.
It enters a crowded space dominated by Obsidian, Logseq, Notion, and Roam Research, but stakes a clear position: file-based, AI-native from day one, AGPL-licensed, and built around the MCP integration story rather than bolted-on AI features.
Key Features
| Feature | Description |
|---|---|
| File-based | Plain .md files + YAML frontmatter, no database |
| Block editor | Slash commands, drag-and-drop, rich blocks |
| Bidirectional Links | Wikilinks with backlinks |
| Native relationships | First-class typed connections between notes |
| Integrated Git | Commit history and change tracking built-in |
| MCP server | Native Claude Code integration |
| Cross-platform | macOS, Windows, Linux |
| Open source | AGPL-3.0, free forever |
Tolaria vs the field
| Aspect | Tolaria | Obsidian | Logseq |
|---|---|---|---|
| Storage | Markdown + YAML | Markdown | Markdown / Org |
| License | AGPL-3.0 | Proprietary (free tier) | AGPL-3.0 |
| Source | Open Source | Closed source | Open Source |
| Editor | Block-based, WYSIWYG | Markdown + live preview | Outliner blocks |
| AI integration | Native MCP server | Plugins / BYOK | Plugins |
| Version control | Built-in Git client | Plugin (Obsidian Git) | DIY |
| Mobile | Desktop only (for now) | iOS + Android | iOS + Android |
| Price | Free | Free / Sync paid / Publish | Free |
Why it matters
Tolaria is part of a 2026 wave of Personal Knowledge Management (PKM) tools designed AI-native from the start: rather than retrofitting AI agents onto a closed format, it gives the agent first-class access to the vault via MCP while keeping the storage open and inspectable. The bet is that the next generation of Tools for Thought (TfTs) will be the ones that a LLM can read, write, and reason over without friction.
The Open Source AGPL license + plain-files + Git combination is a strong signal of local-first values — your data, your machine, your version history.
References
- https://tolaria.md/
- https://github.com/refactoringhq/tolaria
- https://news.ycombinator.com/item?id=47882697
Related
- Luca Rossi
- Obsidian
- Logseq
- Notion
- Roam Research
- Markdown
- Personal Knowledge Management (PKM)
- Tools for Thought (TfTs)
- Bidirectional Links
- Model Context Protocol (MCP)
- Claude Code
- Open Source
- Affero General Public License (AGPL)
- Local-First Software
- AI-Ready Second Brain
About Sébastien
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