How do I install the Inworld skill?

Run npx skillmds@latest add itechmeat/inworld in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Inworld safe to use?

This skill has not completed SkillMD's automated safety review yet. Capability flags: makes network calls, reads secrets. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Inworld?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Inworld free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Inworld?

itechmeat (@itechmeat) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Inworld by itechmeat — Agent Skill

Name: Inworld
Rating: 4.666666666666667 (3 reviews)
Author: itechmeat

Inworld

Inworld TTS API. Covers voice cloning, audio markups, timestamps. Use when integrating Inworld text-to-speech, cloning voices, adding audio markups (SSML-like), or aligning viseme timestamps. Keywords: Inworld, text-to-speech, TTS, voice cloning, visemes.

itechmeat d8ce8cb 6 files · 15.9 KB Updated Sep 9, 2026

File contents

Inworld AI

Text-to-Speech platform with voice cloning, audio markups, and timestamp alignment.

Quick Navigation

Topic	Reference
Installation	installation.md
Voice Cloning	cloning.md
Voice Control	voice-control.md
API Reference	api.md

When to Use

Text-to-speech audio generation
Voice cloning from 5-15 seconds of audio
Emotion-controlled speech ([happy], [sad], etc.)
Word/phoneme timestamps for lip sync
Custom pronunciation with IPA

Models

Model	ID	Latency	Price
TTS-2 Flash	`inworld-tts-2-flash`	lowest	see pricing
TTS-2	`inworld-tts-2`	latest	see pricing
TTS 1.5 Max	`inworld-tts-1.5-max`	legacy	legacy
TTS 1.5 Mini	`inworld-tts-1.5-mini`	legacy	legacy

Minimal Example

import requests, base64, os

response = requests.post(
    "https://api.inworld.ai/tts/v1/voice",
    headers={"Authorization": f"Basic {os.getenv('INWORLD_API_KEY')}"},
    json={"text": "Hello!", "voiceId": "Ashley", "modelId": "inworld-tts-1.5-max"}
)
audio = base64.b64decode(response.json()['audioContent'])

Key Features

15 languages — en, zh, ja, ko, ru, it, es, pt, fr, de, pl, nl, hi, he, ar
Instant cloning — 5-15 seconds audio, no training
Audio markups — [happy], [laughing], [sigh] (English only)
Timestamps — word, phoneme, viseme timing for lip sync
Streaming — /voice:stream endpoint
TTS-2 steering — natural-language bracketed directions such as [say excitedly] or [whisper in a hushed style]
Delivery mode — STABLE, BALANCED, CREATIVE trade consistency for emotional range
Cross-lingual synthesis — reuse one voice across multiple languages; voice localization improves native-sounding output

Release Highlights (TTS-2)

Realtime TTS-2 becomes the new primary model line via modelId="inworld-tts-2".
Steering moves beyond the older fixed emotion tags: free-form bracketed directions can control style, pitch, speed, intensity, and non-verbals.
Multilingual coverage expands with production quality across 15 languages and broader experimental coverage beyond that.
deliveryMode adds a stability-vs-creativity knob, and specifying language matters more for cross-lingual output quality.

Release Updates (August 2026)

New inworld-tts-2-flash model: lowest latency and cost, full language coverage, instant voice cloning, and timestamp alignment. Steering and Professional Voice Cloning remain exclusive to inworld-tts-2.
Steering instructions now persist until explicitly changed: a reserved [reset] tag ends a styled passage, and a <break/> pause no longer clears the active instruction. A request-level instruction field on Synthesize Speech is an alternative to inline tags.
Cross-lingual voice synthesis and voice localization improve native-sounding output when one voice is reused across languages.

Prohibitions

Audio markups work only in English
Use ONE emotion markup at text beginning
Match voice language to text language
Instant cloning may not work for children's voices or unique accents

Links

---name: inworlddescription: Inworld TTS API. Covers voice cloning, audio markups, timestamps. Use when integrating Inworld text-to-speech, cloning voices, adding audio markups (SSML-like), or aligning viseme timestamps. Keywords: Inworld, text-to-speech, TTS, voice cloning, visemes.--- # Inworld AI Text-to-Speech platform with voice cloning, audio markups, and timestamp alignment. ## Quick Navigation | Topic | Reference | | ------------- | ----------------------------------------------- | | Installation | [installation.md](references/installation.md) | | Voice Cloning | [cloning.md](references/cloning.md) | | Voice Control | [voice-control.md](references/voice-control.md) | | API Reference | [api.md](references/api.md) | ## When to Use - Text-to-speech audio generation - Voice cloning from 5-15 seconds of audio - Emotion-controlled speech (`[happy]`, `[sad]`, etc.) - Word/phoneme timestamps for lip sync - Custom pronunciation with IPA ## Models | Model | ID | Latency | Price | | ------------ | ---------------------- | ------- | ----------- | | TTS-2 Flash | `inworld-tts-2-flash` | lowest | see pricing | | TTS-2 | `inworld-tts-2` | latest | see pricing | | TTS 1.5 Max | `inworld-tts-1.5-max` | legacy | legacy | | TTS 1.5 Mini | `inworld-tts-1.5-mini` | legacy | legacy | ## Minimal Example ```python import requests, base64, os response = requests.post( "https://api.inworld.ai/tts/v1/voice", headers={"Authorization": f"Basic {os.getenv('INWORLD_API_KEY')}"}, json={"text": "Hello!", "voiceId": "Ashley", "modelId": "inworld-tts-1.5-max"} ) audio = base64.b64decode(response.json()['audioContent']) ``` ## Key Features - **15 languages** — en, zh, ja, ko, ru, it, es, pt, fr, de, pl, nl, hi, he, ar - **Instant cloning** — 5-15 seconds audio, no training - **Audio markups** — `[happy]`, `[laughing]`, `[sigh]` (English only) - **Timestamps** — word, phoneme, viseme timing for lip sync - **Streaming** — `/voice:stream` endpoint - **TTS-2 steering** — natural-language bracketed directions such as `[say excitedly]` or `[whisper in a hushed style]` - **Delivery mode** — `STABLE`, `BALANCED`, `CREATIVE` trade consistency for emotional range - **Cross-lingual synthesis** — reuse one voice across multiple languages; voice localization improves native-sounding output ## Release Highlights (TTS-2) - `Realtime TTS-2` becomes the new primary model line via `modelId="inworld-tts-2"`. - Steering moves beyond the older fixed emotion tags: free-form bracketed directions can control style, pitch, speed, intensity, and non-verbals. - Multilingual coverage expands with production quality across 15 languages and broader experimental coverage beyond that. - `deliveryMode` adds a stability-vs-creativity knob, and specifying `language` matters more for cross-lingual output quality. ## Release Updates (August 2026) - New `inworld-tts-2-flash` model: lowest latency and cost, full language coverage, instant voice cloning, and timestamp alignment. Steering and Professional Voice Cloning remain exclusive to `inworld-tts-2`. - Steering instructions now persist until explicitly changed: a reserved `[reset]` tag ends a styled passage, and a `<break/>` pause no longer clears the active instruction. A request-level `instruction` field on Synthesize Speech is an alternative to inline tags. - Cross-lingual voice synthesis and voice localization improve native-sounding output when one voice is reused across languages. ## Prohibitions - Audio markups work **only in English** - Use **ONE** emotion markup at text **beginning** - Match voice language to text language - Instant cloning may not work for children's voices or unique accents ## Links - [Documentation](https://docs.inworld.ai/docs/tts/tts) - [Changelog](https://docs.inworld.ai/docs/release-notes/tts) - [Platform](https://platform.inworld.ai/)

Frequently asked questions