diff --git a/03-DESIGN/01-to-be/47-milestones/G-22-lead-answers-2.md b/03-DESIGN/01-to-be/47-milestones/G-22-lead-answers-2.md
index 385335f4..ab58f8ba 100644
--- a/03-DESIGN/01-to-be/47-milestones/G-22-lead-answers-2.md
+++ b/03-DESIGN/01-to-be/47-milestones/G-22-lead-answers-2.md
@@ -173,3 +173,7 @@ the principle that settles it, cited as "design 47 G A-n".
   candidate's catalog half. An unanswered drop is said `call-unanswered` on a five-minute bound key's expiry.
 - **A-223** (corrects A-221; principle 8) A merged pull request's own branch is `head-branch`; `head` stays the head
   commit, as everywhere in the forge messages.
+- **A-224** (§677, A-219; principle 7; code shared between modules is in mesh-sdk) The approval gate is one package,
+  mesh-sdk `go/approval`: the tool runner's gate (node-tools `internal/approval`) moves there and both the tool
+  runner and `go/process`'s seat server use it, each passing the operator channel as an interface (A-219); no second
+  gate is written.