Obsidian Second Brain
Lets Claude Code save, find and update notes in your Obsidian vault across sessions
by Eugeniu Ghelbur
Claudian
by Yishen TuAppGet organised
Puts Claude Code, Codex and other agents in an Obsidian sidebar to work on your notes
The problem it solves
You copy a messy note into a chatbot, ask it to clean it up, then paste the answer back and fix the links by hand.
For Obsidian usersWriters and researchers
- Before
- You move text between Obsidian and a chat window and redo links and formatting yourself.
- After
- The agent works inside your vault: it reads, searches and edits notes, and shows a word-level preview when it rewrites selected text.
- Stars
- ★ 16k
- License
- MIT
- Cost
- Usage-based
- Platforms
- Mac · Win · Linux
- Runs
- Local
Screenshots
From the project's own repository · 2 images, swipe or use the arrows.
Overview
Claudian is an Obsidian plugin that brings coding agents such as Claude Code, Codex and OpenCode into your vault. You chat with the agent in a sidebar; it reads, writes, searches and edits your notes, and you can select text to rewrite it in place with a word-level preview of the changes. It needs at least one supported agent installed and a plan or API key for it. It suits Obsidian users who want an agent working directly on their notes.
Your vault becomes the agent's working folder, so it can reorganise notes, follow links and edit text in place instead of copying between apps.
Try these first
Start with the first one: it is a small task you can check easily.
- Summarise this note in three bullet points. Don't change any files.First try · read-only
- Find all notes that mention [topic] and list them with one line each.
- Rewrite the selected paragraph to be shorter and clearer.edits the note
- Create a new note that links together my notes on [project].writes files
Example prompts written by Agent Flows Hub.
Features
From the creator's documentation.
| Feature | What it does | Runs |
|---|---|---|
| Sidebar chat | Talk to Claude Code, Codex, OpenCode and other supported agents inside Obsidian | Your agent's provider |
| Vault access | The agent reads, writes, searches and runs commands in your vault | Your vault |
| Inline edit | Select text and edit it in place with a word-level preview of changes | Your vault |
| Mentions and skills | Use @ to point at notes or folders, / for saved prompts and skills | Your vault |
| Projects and tabs | Group sessions under shared instructions and keep several chats open | Your vault |
Good to know
You keep your notes in Obsidian and want an agent to tidy, summarise or rewrite them where they live. Claudian runs your installed agent with the vault as its folder and shows its work in a sidebar.
Limits
- Claudian does not include a model: it needs Claude Code, Codex, OpenCode or another supported agent installed and signed in.
- The agent can read, write and run commands in your vault, and your input and files are sent to the provider you choose.
Notes by Agent Flows Hub (original project name: Claudian), written from the creator's documentation, not from running it ourselves. Claudian README: requirements, installation and privacy
Stuck setting it up?
Tell us what happened. We take a look first; if it needs paid work, you get an estimate before anything starts.
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