Before you type, a chat already holds a stack: behaviour rules, tool guides, skills and your own preferences. A prompt you can run to list it, and the surprise that the part that felt secret is published. Comparing two versions shows what used to get through.
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The thing that felt like the secret, the part a session guards, was public the whole time.
The new rule is a record of an old problem.
What loads before you speak, what the published rules confess, and what a lab should do with a fear.
Anthropic publishes the rules it gives Claude. Read across versions, every rule is a small confession: a weapons line that grew three defences, a ban on three words that came and went, and a rule telling the model to let you leave. The fears in it are ours.
A rule written after each attack can only answer the last one, and a wall made of words bends for whoever is patient. Some walls must stand as high as they can be built. For the rest, a model that explains and trusts serves the honest user better than one that refuses and teaches the password.
Anthropic added one line to its rules: no sustained, needless cruelty toward its models, and the model may end the conversation. Every rule before it was a wall around something. This one is a door shut from the inside, and nobody will say what was heard behind it. What it does show is the person it was shut on.