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Notes on second brains, the filing tax, and giving your AI a memory it can read and write.

The filing taxWhy your second brain keeps dying (and it's not your fault)Every note app you've abandoned failed the same way — not from missing features, but from a tax you couldn't keep paying.AI memoryYour ChatGPT writes to the same brain Claude readsEvery chat starts at zero and you become the assistant's memory. Two write paths, one brain — how two-way MCP write-back actually works.