A fresh agent answering "what is a commander, how do I start one" has nothing to answer from, and invents.
The mechanism to fix that already existed and had one user: skills/load.ts compiles an INDEX into every
session — name, when to reach for it, path — and the body costs nothing until the agent opens it. The exact
inverse of an affordance, which sends its body always and its description never.
So no affordance was added, and that is the correction worth recording: an affordance saying "there is a
platform skill" would be a second copy of the index entry, paid for on every turn to say what is already
there. Affordances are facts about the CLIENT; this is reference material.
The platform skill is GENERATED, because a hand-written one rots and we measured it — Spotlight's settings
list drifted in two days, CLAUDE.md claimed 27 permissions against 18 and twenty PM2 entries against
thirteen. A wrong skill is worse than a wrong doc: an agent quotes it with confidence and the user cannot
tell.
Generated: every permission with its kind, label, description, API prefixes, sockets, screens, self-service
routes and read-only-writes; and the keyboard shortcuts. Prose, kept beside the generator so the two cannot
separate: what the platform is, what each KIND means for a user, and where to look next.
It also says what it does NOT cover — installed plugins vary per machine so a generated list would be wrong
on every other server, and request shapes are not in the registry — plus a closing instruction not to guess,
on the grounds that a question the registry cannot answer is one this file cannot either.
docs:check regenerates it into memory and fails if the committed file differs. Verified both directions:
appending one line made it fail naming the file, and regenerating made it pass.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
pastilhasandClaude Opus 5
e4f1b75f9b