Make your notes a second brain in Claude management with these free tools Obsidian saves notes as plain text files on your computer so Claude Code can read and write them directly. Three free and open source projects make the definition: 1. Obsidian-Skills by Steph Ango, Obsidian CEO (50K GitHub stars). Teaches Claude Code, Codex and OpenCode Obsidian own formats: wikilinks, bases, canvas, obsidian command line. Install: npx skills add 2. Cloud-Obsidian (16K stars). Drop articles, documents or notes into an inbox. Claude writes linked notes with sources, answers questions from your vault with quotes and checks for dead links. Start with /cloud-obsidian:wiki. 3. Obsidian-second brain (5K stars). Long-term memory for Claude Code, Codex, and six other agents, is stored in your vault. Start with /obsidian-init. All three are MIT licensed.

Make your notes a second brain in Claude management with these free tools Obsidian saves notes as plain text files on your computer so Claude Code can read and write them directly. Three free and open source projects make the definition: 1. Obsidian-Skills by Steph Ango, Obsidian CEO (50K GitHub stars). Teaches Claude Code, Codex and OpenCode Obsidian own formats: wikilinks, bases, canvas, obsidian command line. Install: npx skills add 2. Cloud-Obsidian (16K stars). Drop articles, documents or notes into an inbox. Claude writes linked notes with sources, answers questions from your vault with quotes and checks for dead links. Start with /cloud-obsidian:wiki. 3. Obsidian-second brain (5K stars). Long-term memory for Claude Code, Codex, and six other agents, is stored in your vault. Start with /obsidian-init. All three are MIT licensed.