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@@ -35,7 +35,9 @@ _Avoid_: router body, thin body
 **Hand-invoked skill**:
 A skill reached only by typing its slash command, declared `disable-model-invocation: true`. The host
 withholds it from the model-visible listing entirely, so it pays no preload tax and its description
-becomes human-facing text. Exemplar: `zoom-out`.
+becomes human-facing text. The flag also hard-blocks the Skill tool, so **no other skill can route to
+a hand-invoked skill** — a `Call \`x\`` step in another skill's body stops working the moment `x`
+takes the flag. Check inbound routes before declaring one. Exemplar: `zoom-out`.
 _Avoid_: manual skill, disabled skill
 
 **Delegation discipline**: