mrambossekandClaude Opus 5
7e1015c211
The grant is the keystone that makes server->client sends safe: created only by an authenticated control-plane action, bound at creation to the session's OBSERVED data-plane source (so it can never be aimed at a third party), and bounded by bytes, average rate and expiry. Sends stop the moment the budget runs out, so a buggy action cannot become a flood. Two granted actions on top of it: - downtrain: N packets at a given size/interval toward the client, with seq + send-timestamp in the payload — downstream loss/reorder/jitter, which an upstream-only train cannot measure. - big_send: one datagram per requested size, echoing the intended size in the payload — downstream MTU / black-hole evidence the client cannot produce for itself (only the far end can emit a large packet toward it). Tests cover the security properties: no grant without a verified destination, client requests clamped to server limits, byte budget stops sending exactly, expiry refuses, and the rate ceiling throttles a burst. Capabilities gain downtrain + big-send. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>