Building a Second Brain with Obsidian and Claude

AI summary focused on the core points of the original article.

Key Concepts and Purpose

Issue: Existing AI (ChatGPT, Claude, etc.) forgets all previous context and memory every time a conversation ends, so you have to explain your background about yourself/project every time.
Solution: Connect a locally managed memo system (an Obsidian vault) to Claude to create a "second brain" where the AI can keep remembering and expanding the user's knowledge and context.

Core Summary of the 10-Step Build

1. Install Claude Desktop: Prepare the Claude Desktop version to use a secure local environment and Claude Code features.

2. Create an Obsidian vault: Create a personal digital repository (Vault) and lay the foundation for a knowledge network through links between notes ([[links]]).

3. Install the local REST API plugin: Enable Obsidian's community plugin, Local REST API, and obtain an API key for communicating with Claude.

4. Connect MCP (Model Context Protocol): Register the API key in Claude Code so that Claude can read, modify, and create Obsidian notes.

5. User interview and write CLAUDE.md: Create a personal manual (CLAUDE.md) that organizes your goals, style, job, etc. through an interview with Claude.

6. Structure by project: Instead of leaving notes scattered randomly, organize them by domain into project folders (input/research/process/output/feedback).

7. Minimize context (project-based work): When proceeding with a specific task, open only the relevant project space to increase the accuracy of AI responses.

8. Turn repetitive work into 'skills': Save repeated best-practice workflows (email writing, summarization, etc.) as reusable commands/skills for Claude.

9. Integrate external tools: Through MCP, connect with everyday apps such as Google Calendar, Gmail, and Slack to build an integrated management environment.

10. Automation and maintenance: Set it up so that Claude periodically organizes notes and prepares daily briefings, automatically running the second brain.

Key Caution

Rather than relying only on prompt instructions to the AI such as "do not delete files," you must directly set technical security measures such as API permission restrictions and read-only settings to ensure data safety.

XPLORED View

It is close to a practical setup that attaches local notes as the AI's memory device and reduces the context that had to be explained every time. It is especially well-suited to the point when you want to reorganize your personal workflow or project document structure.

Good situations to read

When the AI keeps repeating the same questions and it's frustrating
When imagining a work hub with the Obsidian, Claude, and MCP combination

Points to take away

You need to establish the memo structure first for the AI's memory to attach stably
Along with convenience, you also look at safety measures such as permission restrictions and read-only settings

Read original

This article is summarized and interpreted by XPLORED based on publicly available original sources and related materials. Rights to the original source and materials included in it belong to their respective rights holders. If a rights holder requests a correction or removal, we will review and respond promptly.

Get the week's signal by email, every Saturday.

A short read on the tools and articles added that week.