Claude Code with memory

Claude Code starts every session without remembering the last one. What applies in your project — conventions, decisions, the pitfalls of an API — you explain again, or you maintain it by hand in a CLAUDE.md. Osiris is a development environment for coding with Claude that keeps this knowledge in one place and hands it to Claude by itself.

The brain: write it down once

At the core of Osiris is the brain — in the app, the Ultrabrain. Rules, notes and decisions live in it as nodes: Markdown files with a short header, linked with [[double square brackets]]. Every project gets its own branch with areas for rules, API contracts, templates, decisions and docs; what applies everywhere sits above it.

• Rules like “never store money as a float” — Claude reads them before the first decision that matters.
• Priority and scope — a node can rank higher in the context or apply to every project at once.
• Notes and decisions — what you know about a project and why it is built the way it is.

Three ways Claude finds it

• The chat in Osiris. Osiris starts the Claude Code CLI itself and passes it the MCP configuration. Access to the brain is there from the first message, and the connected project applies automatically.
• CLAUDE.md sync. Osiris writes the rules that apply to a project into a marked block of its CLAUDE.md; whatever you wrote around it stays. A short signpost in ~/.claude/CLAUDE.md tells Claude Code where the brain lives and which project is connected — even while Osiris is not running.
• MCP server. For Claude Code in your own terminal and for the Claude desktop app: tools such as ultrabrain_search, ultrabrain_read, ultrabrain_context and ultrabrain_write let Claude look things up and record new findings; memory_query and memory_read open the Memory.

The Memory: learning from conversations

Besides what applies, Osiris keeps what happened. After every conversation, a separate run condenses it into wiki pages with sources — following the pattern Andrej Karpathy called the LLM wiki. How that differs from RAG is explained under LLM wiki instead of RAG.

You see what goes to Claude

Osiris talks to Claude through Anthropic's Claude Code, with your own access. Only what you write in the chat goes to Anthropic, together with the rules and notes Osiris adds from the brain — and the context preview shows you every character of it before you send. The account you hold with Osiris carries the licence and nothing else; your projects, notes and conversations never reach it.

Markdown that stays yours

Because the files are the source of truth, Claude Code can also work in them directly; Osiris notices the change and updates the graph at once. Rename a node and Osiris carries the links pointing to it along. The brain stays a folder of Markdown — readable in Obsidian, versioned in Git, usable without Osiris. Osiris runs locally on Windows, macOS and Linux.