Developers build shared 'project brain' to sync AI coding tools across sessions

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A development team found that AI coding tools like Claude Code, Codex, and Cursor each maintain separate memories, forcing developers to repeatedly re-explain past decisions when switching between tools or sessions. To solve this, they adopted a two-layer approach: a static rules file (AGENTS.md) for stable conventions, and a shared 'project brain' file committed directly to the repository for evolving decisions, corrections, and open questions. The project brain is powered by an open-source MCP server called klypix-mcp, which lets any connected AI tool query past decisions, log new findings, and flag outdated conclusions when underlying code changes. Each tool accesses the same brain.klypix file via MCP, meaning a Monday Claude Code session can seamlessly pick up where a Saturday Codex session left off without human re-briefing. The entire system runs locally on the developer's machine, and the brain file can also be browsed and edited manually through a companion desktop app.

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