claudian

Claudian is a plugin for Obsidian, a popular note-taking application that stores notes as plain text files on your computer. The plugin embeds AI coding agents directly inside Obsidian so you can interact with them through a chat sidebar without switching to a separate terminal or application.

The plugin connects to AI agents including Claude Code (from Anthropic), Codex (from OpenAI), and Opencode. Your Obsidian vault, which is the folder containing all your notes, becomes the working directory for the agent. That means the agent can read files, write files, run searches, and execute multi-step tasks directly within your vault using the same tools these agents use in a coding environment.

Features include an inline editing mode where you select text in a note and use a keyboard shortcut to have the agent rewrite it, with a word-level preview of the changes before you accept them. You can type slash commands to reuse saved prompt templates, use @ mentions to pull in specific files or connect external tools via the Model Context Protocol (MCP), and enable a plan mode where the agent describes its intended approach before making any changes.

Installation requires having the Claude Code CLI already installed on your computer and an active Claude subscription or compatible API provider. The plugin works on macOS, Linux, and Windows desktop. It can be installed by downloading release files from GitHub and placing them in Obsidian's plugin folder, or through a community tool called BRAT that handles automatic updates.

No telemetry is collected beyond what your chosen API provider receives from your requests. Conversation history is stored locally in standard locations on your computer. The project is released under the MIT License.