Calesthio

Create instrumental tracks, songs with lyrics, background music, and jingles using the ElevenLabs Music API. Describe the sound and duration, or edit a structured composition plan to control musical styles and sections.

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• Creating background music for a video
• Generating a song with lyrics
• Making a short jingle

Write, review, and refactor React and Next.js code using performance guidelines from Vercel. Prioritized rules help identify sequential data requests, oversized JavaScript bundles, unnecessary re-renders, and other opportunities to improve loading and responsiveness.

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• Reviewing React components for performance issues
• Improving data fetching in Next.js pages
• Reducing JavaScript bundle size

Integrate FLUX image generation and editing into applications through the BFL API. The guide covers authentication, checking asynchronous results, completion notifications through webhooks, request limits, error handling, regional endpoints, and downloading generated images before their URLs expire.

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• Add FLUX image generation and editing to an application
• Implement result checks and completion notifications
• Handle request limits and API errors

Download videos, audio, and subtitles from YouTube and other supported sites using yt-dlp. Choose resolution and output filenames, extract MP3 audio, or inspect titles, durations, and other video details without downloading the media.

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• Saving videos at a chosen resolution
• Extracting MP3 audio from a video URL
• Downloading subtitles without the video

Edit local video files with ffmpeg, a command-line media tool. Trim and join clips, resize for social platforms, adjust playback speed, extract or replace audio, add image overlays, and export compressed or converted files.

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• Trimming and joining video clips
• Resizing videos for social platforms
• Extracting or replacing audio

Implement animation in React with Framer Motion examples based on Disney's 12 animation principles. Add squash and stretch, preparatory movements, smooth acceleration, overlapping motion, and hover or tap responses with defined timing.

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• Adding hover and tap responses to buttons
• Animating jumps with preparation and curved paths
• Revealing list items one after another

Generate multilingual narration from scripts in OpenMontage using Azure AI Speech. Choose a voice, adjust speaking rate, pitch, and supported delivery styles, then save individual narration segments as MP3 or WAV files.

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• Creating narration for explainer videos
• Generating voiceovers in multiple languages
• Adjusting narration speed and delivery style

Build reusable interface components with Tailwind CSS v4, using shared design values for colors, corners, and themes. Covers buttons, forms, responsive layouts, accessibility, and dark mode to help standardize interfaces across a project.

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• Build a reusable UI component library
• Standardize colors and component styles
• Add responsive layouts and dark mode

Replace a face in a video using a source photo and the HeyGen API. The skill covers submitting image and video URLs, checking processing status, and retrieving the finished video, including workflows that personalize generated avatar videos.

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• Replace a face in a recorded video
• Personalize an avatar video with a face photo
• Track processing and retrieve the finished video

Generate HeyGen videos from text prompts or specify avatars, voices, scripts, and scenes for controlled production. This deprecated skill covers explainers and presentations; its replacement skills separate prompt-based generation from detailed avatar video creation.

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• Generating explainer videos from text prompts
• Creating avatar presentations with an exact script
• Specifying avatars and backgrounds for each scene

Transcribe audio with Azure AI Speech and obtain word timestamps, speaker labels, and language identification. Use the resulting transcript in OpenMontage subtitle workflows, with a compatible local transcription fallback when Azure is unavailable.

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• Transcribing recorded audio
• Preparing timestamps for video subtitles
• Labeling speakers in interviews

Build asset loading for Three.js scenes, including 3D models, textures, and HDR images for backgrounds and reflections. Coordinate multiple files, track loading progress, reuse cached assets, and handle failures with retries or fallback files.

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• Load GLTF/GLB models into a Three.js scene
• Show loading progress across multiple assets
• Use HDR images for backgrounds and reflections

Build custom interactive charts, network diagrams, and maps with d3.js. Guides data-driven drawing, tooltips, zooming, animation, responsive sizing, and accessibility, with examples that work in plain JavaScript or frameworks such as React, Vue, and Svelte.

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• Building charts with custom layouts and styling
• Creating network diagrams and geographic visualizations
• Adding tooltips, zooming, and animated transitions

Refactor React components with too many true-or-false options into reusable parts. Provides guidance on component composition, shared state, and flexible interfaces, with examples of good and problematic implementations and specific guidance for React 19.

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• Refactoring components with too many boolean options
• Designing reusable component libraries
• Reviewing shared state and component architecture

Build voice assistants and conversational characters with ElevenLabs. Configure voices, language models, and external tools, then connect conversations to a website widget or use Twilio integration for outbound phone calls.

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• Creating a voice bot for customer support
• Embedding a voice assistant on a website
• Building an interactive voice character

Create mathematical and geometric animations in Python with Manim Community Edition. Use guidance, examples, and scene templates to structure animations, display equations, plot graphs, control cameras, and render two-dimensional or three-dimensional scenes.

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• Animating equations and derivations
• Creating function graphs and area visualizations
• Building 3D surfaces with camera movement

Set up an ElevenLabs API key for MCP tools that connect agents to ElevenLabs. Checks existing credentials, guides key creation when needed, validates access, and saves a working key in a .env file.

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• Setting up ElevenLabs MCP tools for the first time
• Resolving errors caused by a missing API key
• Checking whether an existing API key works

Generate background music and songs with lyrics using ACE-Step 1.5, with controls for duration, tempo, and musical key. You can also restyle reference audio and separate vocals or individual instruments from mixed tracks.

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• Generate background music to match a video scene
• Create a short jingle with supplied lyrics
• Make a jazz arrangement of reference audio

Translate and dub existing videos with HeyGen to create versions in multiple languages. Preserve the speaker’s voice characteristics, match lip movements to translated speech, or choose audio-only translation without adjusting the video’s lip movements.

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• Create multilingual versions of a product demo
• Dub videos with matching lip movements
• Translate audio without changing lip movements

Plan and scope production work with Odyssey's real-time interactive video world models (odyssey.ml — Odyssey-1/Odyssey-2/Starchild-1/Agora-1). Use when a request involves generating video that a user steers live with keyboard, text, speech, or controller input (streamed frames that respond in the moment), or when someone must decide between Odyssey-style interactive generation and offline clip generators (Sora/Veo/Kling) or downloadable 3D / game engines. Covers what is verified versus announced, current access routes, latency and coherence limits, feasible-now versus speculative use cases, pricing/access terms, and content/rights considerations. This is a fast-moving research-stage product; the skill teaches honest scoping, not a promise of production reliability.

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Build production OpenAI Realtime voice agents and low-latency spoken interactions with live audio sessions, WebRTC or WebSocket transport, voice activity detection, tool/function calling, prompt design, logging, consent, privacy, safety, latency, and cost controls. Use for speech-to-speech agents and live voice UX; do not use for separate request-based transcription, text-to-speech, or offline audio generation work.

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Generate persistent, explorable 3D worlds/environments with Marble by World Labs — from text, a single image, multiple images, video, or a 360 panorama, plus coarse-structure blocking with Chisel. Use this skill when a task needs a navigable 3D scene, VR/immersive backdrop, virtual-production environment, previz set, game-blockout, or web/engine-ready Gaussian splat or mesh, and you must choose an input mode, a Marble model, an export format, and a plan/API route, then review world quality. Covers the Marble web app and the World API, editing/expansion, output formats and what each supports downstream, import into Unity/Unreal/Blender/Houdini/web, pricing/credits, capability limits, and rights/licensing. Not for flat text-to-image, text-to-video clips, or real-time on-the-fly world models (Marble outputs are downloadable, static 3D environments).

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Production guidance for mainland-China Volcengine Doubao Speech text-to-speech. Use for TTS 1.0/2.0 selection, V3 bidirectional or unidirectional streaming, asynchronous long-text submit/query jobs, current voices and controls, timestamps and SSML caveats, expiring results, quota/error handling, authorized cloned voices, privacy, and audio QA. Do not use for international BytePlus endpoints.

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Select, run, and govern NVIDIA Cosmos world-video generation across Cosmos 3 Generator, Predict2.5, Transfer2.5, downloadable checkpoints, self-hosted NIMs, and hosted preview surfaces. Use for text/image/video-to-world, controlled world transfer, multiview or action-conditioned physical-AI video, local checkpoint pinning, hardware planning, inference approval, and output validation; do not use for Cosmos Reason/Embed-only tasks.

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