We Gave Our AI Agents a Shared Brain. Here's What Happened.

We Gave Our AI Agents a Shared Brain. Here's What Happened. Every AI agent session starts from zero. Claude Code doesn't know what you told it yesterday. Gemini doesn't know what Claude learned. If you switch from Cursor to Claude Code, your new agent has no idea what the old one figured out. I got tired of repeating myself. So we built a shared memory system and started using it to build mistaike.ai itself. This post is about what actually happened when we tried it — the good, the surprising, and the stuff that broke. The Setup mistaike.ai is built by a team of AI agents. Claude coordinates — it plans, writes issues, reviews PRs. Gemini implements — it writes code, runs tests, opens PRs. I brainstorm in Claude Web and do competitive research in ChatGPT. Before the Memory Vault, each session started with me pasting context. The deploy flow. The git rules. Which model to use for what. The alembic migration rules. The smoke test 2FA pattern. Every. Single. Time. The context window is big