DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.
Inter-session messaging lost its feature-flag refusal
You'll notice
Useful3Signal3
Inter-Session Messaging
Session-to-session messages can no longer be refused for lacking a feature flag.
What's wrong with this entry?
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What
The set of reasons a session-to-session message can be refused no longer includes a feature-flag one, and the check that tested for it is gone. Refusals now come only from deployment, policy and authentication rules.
Evidence
"flag_off"
Strings lifted out of the shipped bundle, so the claim above can be checked against them.