Facebook Skills

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…

When adding a new IR instruction, you must touch a specific set of files. This skill describes each file, the pattern to follow, and important conventions.

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

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

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…

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…

Monitor API health for a Meta app — check rate limits, call volume, and API deprecations. Use to diagnose throttling, plan capacity, or prepare for API version…

Guide a developer through setting up a Meta API integration from scratch — discovers the right APIs, fetches setup guides, authentication requirements,…

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…

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

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",…

Analyze per-commit binary size changes of the hermesvm shared library across a git commit range. Produces a markdown report with per-commit sizes and summary tables of significant increases and decreases.

Guide users through writing their first Buck2 rule to learn fundamental concepts including rules, actions, targets, configurations, analysis, and select(). Use…

Guide users through writing their first Buck2 rule to learn fundamental concepts including rules, actions, targets, configurations, analysis, and select(). Use…

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

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

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

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

Find and click a target object in XR. Use when testing UI interactions, clicking buttons, or verifying interactable elements work correctly.

Find and click a target object in XR. Use when testing UI interactions, clicking buttons, or verifying interactable elements work correctly.

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

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

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

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

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

Troubleshoot webhook issues for a Meta app — inspect active subscriptions, identify misconfiguration, and send test payloads to verify delivery. Use when…

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

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

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

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

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

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

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

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

Extract and manage error codes for React applications. Automatically extracts error messages from React source code and assigns unique error codes to new messages Detects "unknown error code" warnings and flags messages that need code assignment Validates that error codes remain synchronized with the current codebase through a simple yarn command

Manage React feature flags across channels, gate tests conditionally, and debug flag-specific test failures. Four flag files control defaults and channel-specific overrides (canary, www, React Native, test renderer) with __VARIANT__ flags simulating gatekeepers tested in both states Use @gate flagName pragma to skip tests entirely when a flag is unavailable, or inline gate() to branch assertions when behavior differs Adding a new flag requires entries in the main file plus all fork files;...

Automated code formatting and linting to resolve style issues before CI checks. Runs Prettier for code formatting and linc for lint validation in sequence Identifies remaining manual fixes needed after automated corrections Prevents CI failures by catching formatting and lint errors before commit

Inspect and compare feature flag states across React release channels. View all flags across channels (www, www-modern, canary, next, experimental, rn variants) or compare specific channels with --diff Output formats include default table view, CSV export, and cleanup status grouping Flag states indicated by symbols: enabled (✅), disabled (❌), variant testing (🧪), profiling-only (📊) Common pitfall: __VARIANT__ flags are tested in both states on www; use --diff to spot meaningful...

Static type checking for React code across DOM and native platforms. Four renderer options cover standard DOM, browser-specific code, React Native, and Fabric environments Run yarn flow with optional renderer argument; use yarn flow-ci for comprehensive but slower checks Reports type errors with file locations to help identify and fix issues quickly Watch for common pitfalls: missing renderer specification, unexamined $FlowFixMe suppressions, and incorrect type imports

For the full explanation and rationale, see doc/GCSafeCoding.md .

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

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

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

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

IWSDK project planning and best practices guide. Use when planning new IWSDK features, designing systems/components, reviewing IWSDK code architecture, or when…

IWSDK project planning and best practices guide. Use when planning new IWSDK features, designing systems/components, reviewing IWSDK code architecture, or when…

Develop and iterate on IWSDK UI panels efficiently. Use when working on PanelUI components, debugging UI layout, or improving UI design in IWSDK applications.

Develop and iterate on IWSDK UI panels efficiently. Use when working on PanelUI components, debugging UI layout, or improving UI design in IWSDK applications.

MockDeviceKit for testing without physical glasses hardware

MockDeviceKit for testing without physical glasses hardware

MockDeviceKit for testing without physical glasses hardware

MockDeviceKit for testing without physical glasses hardware

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…

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…

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.…

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.…

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…

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…

App registration with Meta AI and device permission flows

App registration with Meta AI, camera permission flows

App registration with Meta AI and device permission flows

App registration with Meta AI, camera permission flows

Relay is a GraphQL client for React that enforces colocated, composable, and type-safe data fetching. Its core insight is that each component should declare exactly what data it needs via GraphQL fragments, and Relay handles the rest — fetching, caching, consistency, and updates.

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

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

Performance best practices for Relay applications. Use when optimizing data fetching, reducing re-renders, configuring caching, or improving time to first…

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

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

Building a complete DAT app with camera streaming and photo capture

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

Device session states, pause/resume, availability monitoring

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

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

Device session states, pause/resume, availability monitoring

Run tests for React codebase across multiple release channels and configurations. Supports six release channels: source (default), experimental, www, www with variant false, stable, and classic, each with distinct feature flag configurations Accepts test patterns, watch mode for TDD, and variant flags to test different code paths Requires explicit test pattern argument to avoid running the entire test suite; uses --silent flag to surface failures and --no-watchman for sandboxing...

Parallel test orchestrator. Runs all 9 test suites concurrently via Task sub-agents and the iwsdk CLI. Handles build, example setup, dev servers, agent launch,…

Parallel test orchestrator. Runs all 9 test suites concurrently via Task sub-agents and the iwsdk CLI. Handles build, example setup, dev servers, agent launch,…

Test audio system (AudioSource loading, playback state, stop, spatial audio) against the audio example using the iwsdk CLI.

Test audio system (AudioSource loading, playback state, stop, spatial audio) against the audio example using the iwsdk CLI.

Test ECS core functionality (system registration, components, Transform sync, pause/step/resume, system toggle, entity discovery, snapshots) against the poke…

Test ECS core functionality (system registration, components, Transform sync, pause/step/resume, system toggle, entity discovery, snapshots) against the poke…

Test environment system (DomeGradient, IBLGradient, default lighting, component schemas) against the poke example using the iwsdk CLI.

Test environment system (DomeGradient, IBLGradient, default lighting, component schemas) against the poke example using the iwsdk CLI.

Test grab system (distance grab, one-hand grab, two-hand grab) against the grab example using the iwsdk CLI.

Test grab system (distance grab, one-hand grab, two-hand grab) against the grab example using the iwsdk CLI.

Test XR interactions (ray, poke/touch, dual-mode, audio, UI panel) against the poke example using the iwsdk CLI.

Test XR interactions (ray, poke/touch, dual-mode, audio, UI panel) against the poke example using the iwsdk CLI.

Test level system (LevelRoot, LevelTag, default lighting, scene hierarchy) against the poke example using the iwsdk CLI.

Test level system (LevelRoot, LevelTag, default lighting, scene hierarchy) against the poke example using the iwsdk CLI.

Test locomotion system (slide, snap turn, teleport, jump) against the locomotion example using the iwsdk CLI.

Test locomotion system (slide, snap turn, teleport, jump) against the locomotion example using the iwsdk CLI.

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

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

Test UI system (PanelUI, ScreenSpace) against the poke example using the iwsdk CLI.

Test UI system (PanelUI, ScreenSpace) against the poke example using the iwsdk CLI.

Pre-commit validation for React contributions with parallel type checking and testing. Runs formatting and linting sequentially, stopping on first failure to catch issues early Executes type checking and dual test suites (source and www) in parallel using subagents for efficiency Accepts optional test pattern argument to filter which tests run Provides detailed failure reporting with suggested fixes when any step fails

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…

Test XR session lifecycle and mode transitions. Use when verifying XR enter/exit behavior, testing mode-dependent features, or debugging session state issues.

Test XR session lifecycle and mode transitions. Use when verifying XR enter/exit behavior, testing mode-dependent features, or debugging session state issues.