functor

Write, run, and debug Functor Lang (.fun) — Functor's F#-inspired game-logic language. Use whenever creating or editing .fun files, answering Functor Lang syntax/semantics questions, or debugging Functor Lang parse/run/check errors. Functor Lang is a custom language — do NOT guess from F#/OCaml intuition; this skill is the source of truth for the current subset.

Build, install, launch, live-reload, inspect, capture, troubleshoot, and benchmark Functor on an adb-attached Meta Quest. Use for Oculus/OpenXR runtime changes, `functor run vr`, headset rendering verification, stereo captures, device performance measurements, or recovery when the APK remains at Meta Home, the XR session dozes, or adb forwarding disappears.

Capture a looping GIF + a still PNG of a visual/rendering change and embed them in its pull request. Uses Functor's headless frame-capture path (no screen recording, deterministic via --fixed-time), assembles a GIF with PIL, hosts the binaries in a gist (pushed via git, the only token-friendly host for binary images), and embeds them in the PR body. Use whenever a change adds or alters something visible (a new example/scene, a rendering/material/lighting/camera feature, a shader) and you're opening or updating a PR — see CLAUDE.md.