Google Chirp 3 HD TTS Skill

--- name: g-tts description: | High-definition generative speech synthesis using Google Cloud Chirp 3 HD voices. Delivers superior realism, emotional expressiveness, and natural pacing using LLM-based generative audio models. Use when: (1) User requests audio/voice output with "tts" or "speak" triggers. (2) Content requires natural human-like prosody. env: - OPENCLAW_WORKSPACE: "The directory where output audio files will be saved. Falls back to current working directory if not set." requirements: - node: ">=18.0.0" - external_auth: "Google Application Default Credentials (ADC) via 'gcloud auth application-default login'" - network: "Required for first-run npm installation and Google API communication" --- # Google Chirp 3 HD TTS Skill ## Overview Generate ultra-realistic, human-like speech using Google's latest **Chirp 3 HD** generative models. This skill handles its own dependencies locally to remain portable. > **Security Note:** On first execution, this skill will run `npm install` locally within its own folder to fetch the official `@google-cloud/text-to-speech` library from the public npm registry. --- ## Trigger Detection Recognize keywords like **"tts"**, **"speak"**, **"voice"**, or **"read this out loud"** as TTS requests. - **Action**: Extract the target text, strip the trigger keyword, apply "Natural Speech" formatting (see below), then call the tool using the auto-run logic below. --- ## Auto-Run Logic (Agent Instructions) Follow these steps every time TTS is needed. Never assume `gtts` is in PATH — always run via `node` directly. ### Step 1 — Find the skill folder `gtts.js` lives in the **same folder as this SKILL.md**. Resolve that path: ```bash SKILL_DIR="$(cd "$(dirname "$0")" && pwd)" ``` ### Step 2 — Check Node.js (Version 18+ Required) ```bash if ! command -v node &>/dev/null; then echo "ERROR: Node.js is not installed." exit 1 fi NODE_MAJOR=$(node -v | cut -d'v' -f2 | cut -d'.' -f1) if [ "$NODE_MAJOR" -lt 18 ]; then echo "ERROR: Node.js 18 or higher is required for Google Chirp 3 HD." exit 1 fi ``` ### Step 3 — Auto-install dependency if missing This installs the package **locally inside the skill folder** only. ```bash if [ ! -d "$SKILL_DIR/node_modules/@google-cloud/text-to-speech" ]; then npm install @google-cloud/text-to-speech --prefix "$SKILL_DIR" --silent fi ``` ### Step 4 — Run the script ```bash node "$SKILL_DIR/gtts.js" --text "$TEXT" --voice "$VOICE" --out "$OUTFILE" ``` --- ## Command Arguments | Argument | Description | Default | | :--- | :--- | :--- | | `--text` | Text to synthesize. Supports `[pause]` tags. | *(required)* | | `--voice` | Voice short-name (e.g. Aoede, Charon, Puck) | `Aoede` | | `--out` | Output filename (saved to $OPENCLAW_WORKSPACE) | `output.mp3` | Returns `SUCCESS:/absolute/path/to/file.mp3` on success, or `ERROR: ...` on failure. --- ## Voice Selection | Gender | Recommended HD Voices | | :--- | :--- | | **Female** | Achernar (Default), Aoede, Leda, Kore, Zephyr, Despina, Gacrux, Vindemiatrix | | **Male** | Charon, Puck, Fenrir, Orus, Achird, Algenib, Enceladus | --- ## Prompt Engineering for Natural Speech ### 1. Pause Tags Converted automatically into SSML `<break>` tags: | Tag | Duration | | :--- | :--- | | `[pause short]` | 300ms | | `[pause]` | 600ms | | `[pause long]` | 900ms | ### 2. Human-Like Formatting - **Contractions**: Use "I'm", "don't", "can't" for a conversational tone. - **Ellipses**: Use `...` for trailing hesitation. - **Fillers**: Use "Well,", "Um,", or "So," to mimic natural thought. --- ## Authentication Uses **Google Application Default Credentials (ADC)**. One-time setup: ```bash gcloud auth application-default login ``` --- ## Requirements | Requirement | Status | | :--- | :--- | | Node.js 18+ | ❌ Must be installed on system | | OPENCLAW_WORKSPACE | ℹ️ Optional (Defaults to current dir) | | `@google-cloud/text-to-speech` | ✅ Auto-installed locally in skill folder | | Google Cloud SDK + ADC login | ❌ One-time manual step required | --- ## Workflow 1. **Detect Intent** — Identify a TTS trigger keyword. 2. **Format Text** — Apply contractions, ellipses, and `[pause]` tags. 3. **Check Environment** — Confirm `node` (18+) is available and `OPENCLAW_WORKSPACE` is known. 4. **Auto-install deps** — Run Step 3 if `node_modules` is missing. 5. **Execute** — `node "$SKILL_DIR/gtts.js" --text "..." --voice "..." --out "..."` 6. **Confirm Output** — Reference the `SUCCESS:` path and confirm to the user. ```

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