Build a second brain every AI can share: your content in Oracle AI Database 26ai — semantic search with in-database embeddings, a self-compiling wiki, four kinds of agent memory, and an MCP server that plugs it into Claude, ChatGPT, and any MCP client. Runs on the free local container or Always Free cloud.
4 files for Claude Code, Codex and OpenCode: PreToolUse, second-brain, second-brain AGENTS.md, second-brain CLAUDE.md — 1,835 tokens loaded in every session.
AGENTS.md A 1,778 tok CLAUDE.md A 57 tok .claude/settings.json A — .claude/settings.json A — These files are LindaHaviv/second-brain's own configuration — they tell Claude Code, Codex and OpenCode how to work on this repository, so they are not mods to install elsewhere. Copy one as a starting point and replace the parts that are about this project.