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IWSDK experience pipeline and planning guide. Use when building a new IWSDK app/game end-to-end, planning new IWSDK features, designing systems/components, reviewing IWSDK code architecture, or when the user asks about IWSDK patterns, ECS design, signals, or…

MUST read this skill BEFORE developing VR/MR/desktop 3D applications using IWSDK (Immersive Web SDK). Covers project scaffolding, headless browser setup, CLI tools, reference system, ECS debugging, XR emulation, verification workflows, deployment, and known…

Create, place, preview, debug, and connect manifest-backed IWSDK UIKitML assets. Use for spatial panels, browser HUDs, UIKitML layout, fonts, editor previews, or runtime element behavior.

Create, place, preview, debug, and connect manifest-backed IWSDK UIKitML assets. Use for spatial panels, browser HUDs, UIKitML layout, fonts, editor previews, or runtime element behavior.

Test Havok physics system (gravity, rigid bodies, static vs dynamic) against the physics example using the iwsdk CLI.

Guide for implementing physics in IWSDK projects. Use when adding physics simulation, configuring rigid bodies, collision shapes, applying forces, creating grabbable physics objects, or troubleshooting physics behavior.

Compose editable static IWSDK scenes from text, images, or hybrid references using a shared application asset manifest, v1 scene JSON, modular scene files, and the managed editor's validation and rendering tools. Use for 3D environments, props, architecture,…

Debug continuous behavior in WebXR scenes — physics, animations, collisions, game loops, or any real-time interaction that happens too fast for an agent to observe. Uses ECS pause/step/snapshot/diff to freeze time and inspect state frame by frame.

Add device sensor data to a Meta Display Glasses webapp — IMU (accelerometer, gyroscope, orientation) via DeviceMotionEvent/DeviceOrientationEvent, and GPS location via navigator.geolocation. Use when the user wants motion tracking, compass, level tool, step…

Handle EMG pinch (tap-to-activate) and opt into continuous pinch-and-drag in a Meta Display Glasses webapp. Use when the user wants sliders, drawing, maps, drag interactions, or game-style continuous input.

Make a Meta Display Glasses webapp work offline with a Service Worker + Cache API (precache the app shell, cache-first fetch, online/offline UI). Use when the user wants offline support or resilience to flaky Wi-Fi.

Add text entry to a Meta Display Glasses webapp. Standard HTML inputs open the on-glasses composer (handwriting + voice) when focused and tapped. Use when the user wants a text field, search box, form input, or notes area.

Add UI components to a Meta Display Glasses webapp — screens, buttons, lists, cards, forms, toggles, counters, or nav bars. Works with vanilla JS and React apps. Use when the user wants to add any interactive UI element or new screen.

Connect a Meta Display Glasses webapp to REST APIs or WebSockets. Use when the user wants to fetch data from an API, add real-time updates, show loading/error states, or cache API responses.

Create a new webapp for Meta Display Glasses with D-pad navigation and 600x600 dark-theme display. Use when the user wants to build a new glasses app, start a project, or scaffold a webapp for smart glasses.

Publish a Meta Display Glasses webapp to Vercel for live HTTPS access on device. Use when the developer is ready to publish, host, ship, or release a webapp to a stable production URL for everyone. Handles server setup, Vercel project creation, and direct…

Stream, video frames, photo capture, resolution/frame rate configuration

Swift patterns, async/await, naming conventions, key types for DAT SDK iOS development

Common issues, Developer Mode, version compatibility, state machine diagnosis

Display capability setup, display-capable device selection, UI DSL, icons, buttons, images, and video playback

SDK setup, Swift Package Manager integration, Info.plist configuration, and first connection to Meta glasses

Use this whenever debugging an iOS DAT app with local DAT Inspector MCP tools, live device events, Meta AI app/device boundary issues, permissions, registration, sessions, streaming, callbacks, or user reports that the app cannot communicate with glasses.

Building a complete DAT app with camera streaming and photo capture

Device session states, pause/resume, availability monitoring

Session and Stream capability setup, video frames, photo capture, resolution and frame rate configuration

Kotlin patterns, DatResult, session and capability conventions for DAT SDK Android development

Common issues, Developer Mode, version compatibility, and session and stream diagnosis

Display capability setup, display-capable device selection, UI DSL, icons, buttons, images, and video playback

SDK setup, Gradle integration, AndroidManifest configuration, and first connection to Meta glasses

Use this whenever debugging an Android DAT app with local DAT Inspector MCP tools, live device events, Meta AI app/device boundary issues, permissions, registration, sessions, streaming, or user reports that the app cannot communicate with glasses.

Building a complete DAT app with session creation, camera streaming, and photo capture

Session state, stream state, pause and resume behavior, and device availability monitoring

Monitor API health for a Meta app — check rate limits, call volume, and API deprecations. Use whenever a user asks whether their app is being throttled, is near its rate limits, how much of its call volume or quota is being used, or about deprecated Graph API…

Run a comprehensive health check on a Meta app — audits settings, security, compliance, app review status, rate limits, and API deprecations in one pass. Use when you want a full picture of an app's current state.

Guide a developer through setting up a Meta API integration from scratch — discovers the right APIs, fetches setup guides, authentication requirements, permissions, and code examples. Use when the user wants to build with a specific Meta product (WhatsApp,…

Prepare a Meta app for App Review — checks current status, outstanding requirements, granted privileges, and submission history. Use before submitting an app for review.

Check compliance status for a Meta app — surfaces open required actions, active violations, and recommendations with remediation guidance. Use to audit compliance posture or resolve compliance blockers.

Troubleshoot webhook issues for a Meta app — inspect active subscriptions, identify misconfiguration, and send test payloads to verify delivery. Use when webhooks aren't working as expected.

Search Meta developer documentation for API guides, references, and tutorials. Use when looking up how a Meta API works, finding integration guides, or exploring platform capabilities.

Set up webhooks for a Meta app end-to-end — discover available topics, subscribe to fields, and verify with a test payload. Use when configuring webhooks for the first time or adding new subscriptions.

Rules for writing and reviewing GC-safe C++ code in the Hermes VM runtime. Use when writing, modifying, or reviewing C++ runtime VM code that uses internal Hermes VM APIs (as opposed to code using JSI). This includes working with GC-managed types…

Guide for adding new JSI functionality to the JavaScript Interface (JSI) layer. Use when the user asks to add, create, or implement new methods or features in the JSI Runtime interface. Covers all required files across JSI core, Hermes implementation, and…

This skill should be used when the user wants to analyze hermesvm binary size changes across a range of commits. Use when the user mentions "binary size", "size analysis", "size regression", "size increase", or asks to measure how commits affect the hermesvm…

Use when needing to reorder, split, drop, or amend git commits that are not the top commit, without interactive editor access. Covers programmatic rebase via GIT_SEQUENCE_EDITOR, commit splitting with automated hunk selection, and metadata changes (author,…

Guide for adding a new IR instruction to the Hermes compiler. Use when the user asks to add, create, or define a new IR instruction (Inst/Instruction) in the Hermes intermediate representation. Covers all required files and the patterns for each.

Use when running, debugging, updating, or creating Pysa end-to-end integration tests. Use when taint analysis tests fail, when expected output files need updating, or when working with .models, .cg, .hofcg, .overrides files under…

Use when you need to understand the Pyre or Pysa codebase architecture, find where specific functionality is implemented, or navigate the source directory structure. Use when working on OCaml code, debugging type checking or taint analysis issues, or…

Use when creating commits or diffs to apply the correct title prefix, reviewer, and test plan based on the area of the codebase being changed.

Use when debugging a Pysa false negative (missing taint issue), comparing two Pysa output directories, or finding where taint flow is lost.

Use when reading, writing, or debugging Pysa JSON model output (.models files). Use when working with taint models that describe sources, sinks, TITO, sanitizers, or issues in JSON format.

Triage systemd-managed EdenFS issues on Linux devservers and OnDemands. Use when investigating EdenFS service failures, unexpected restarts, systemctl errors, edenfs_upgrade/edenfs_restarter problems, or when a user reports EdenFS is down on a systemd-enabled…

Load FIRST before searching code in eden/. Contains component-to-file maps, key type names, and architecture diagrams for EdenFS, Sapling, and Mononoke. Tells you exactly which files to read for any task. References contain per-component quick reference…

Create a Mononoke server-side hook with 3-diff split (tests, wiring, implementation), unit tests, and integration tests

Add or review structured error logging in EdenFS daemon (C++) — the ErrorLogger / EdenErrorInfo system that feeds the edenfs_errors table. Use when writing a catch block or handling a boxed/async exception (folly::Try / exception_wrapper / .thenError),…

How to mint real OpenZL frames and chunks for GPU decoder tests using the contrib/gpu/testkit utilities (frame_factory, multichunk_frame, frame_verifier), and how to extract a codec's encoded streams via reflection for differential GPU decode. USE when…

Design patterns and requirements for OpenZL codecs (located under `src/openzl/codecs/`). **USE AUOMATICALLY** when creating, modifying, or reviewing codecs in OpenZL.

Design documentation for the OpenZL component registry located under tests/registry. **USE AUTOMATICALLY** whenever editing files under tests/registry/.

Use when creating benchmark scenarios for new openzl codec nodes in unitBench - adding kernel-level encode/decode benchmarks or graph-level compress/decompress benchmarks for codecs like bitsplit, delta, transpose, entropy, etc.

Comprehensive FBOSS code review with 11 parallel reviewers (5 generic + 6 FBOSS-specific). Covers reliability, engineering, code quality, silent failures, agent architecture, SAI/SDK, FSDB/thrift_cow, platform/config, testing, and cross-cutting design.…

FBOSS coding standards and patterns. Auto-loaded when writing code in fboss/ to catch architecture violations, SAI/SDK misuse, thrift_cow pitfalls, platform config errors, and testing gaps. For explicit multi-reviewer review, use /fboss-review instead.

Find and remove redundant FBOSS agent_hw_tests without losing coverage. Use when asked to reduce/combine/dedup HW tests, retire non-dataplane (set/get) tests where dataplane tests exist, or cut HW test runtime while keeping coverage. Report-first; applying…

Triage a failing FBOSS test by bisecting commits and investigating code changes. Use when a test is broken and you need to find the commit that caused the failure.

Write and run markdown-driven e2e tests for Relay. Covers fixture format, server/client code patterns, interaction DSL, snapshots, and running tests.

Best practices for writing idiomatic Relay code. ALWAYS use this skill when writing or modifying React components that use Relay for data fetching. Covers fragments, queries, mutations, pagination, and common anti-patterns. Use when you see `useFragment`,…

Performance best practices for Relay applications. Use when optimizing data fetching, reducing re-renders, configuring caching, or improving time to first meaningful paint. Covers query placement, @defer, pagination, fetch policies, garbage collection,…

Port a PyTorch model to use pyrefly's tensor shape type system (Tensor[[B, C, H, W]], Int[T]). Use this skill whenever the user wants to add shape annotations to a PyTorch model, type a model with tensor dimensions, port a model to use shape tracking, or…

Use when adding a new PyTorch model to Pyrefly's shape-tracking example corpus under tensor-shapes/pyrefly-torch-stubs/examples — i.e. importing a model as a tested, corpus-quality reference port. This is maintainer-facing fbsource work. For porting your own…

Use when Pyrefly computes a wrong tensor shape (or is missing one that can't be expressed in a stub signature) and you need to add or fix a shape-DSL rule. Requires a Pyrefly checkout (fbsource or a clone); not usable from a pip/site-packages install.