# Gemini 3.1 Flash Tts

> Use when someone needs spoken narration or voiceover — explainer tracks, documentary lines, or voice to pair with generated video.

- Skill: `prunaai/gemini-3-1-flash-tts` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add prunaai/gemini-3-1-flash-tts`
- Raw SKILL.md: https://api.skillmd.com/api/skills/prunaai/gemini-3-1-flash-tts/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- License: MIT
- Author: PrunaAI (https://skillmd.com/u/prunaai)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/prunaai/gemini-3-1-flash-tts

---


## Prerequisites

Install and load these skills before generating (skip if already in context via `@pruna`):

| Skill | Description | Install |
| --- | --- | --- |
| `generation-diversity` | Use when writing any generative prompt — ritual seed, explicit structure, scenario axes, and quality gates before paid API calls. | `npx skills add PrunaAI/pruna-skills@generation-diversity -y` |
| `audio-prompting` | Use when crafting TTS, music, or bed prompts for any generative audio model — director style, song structure, and post-production layering. | `npx skills add PrunaAI/pruna-skills@audio-prompting -y` |
| `video-prompting` | Use when crafting video or motion prompts for any generative model — dramaturgy, camera, physics-safe motion, frame anchors, and clip chaining. | `npx skills add PrunaAI/pruna-skills@video-prompting -y` |
| `pruna-api` | Use before any Pruna or Replicate HTTP call — credentials, upload/poll/download, parallel batches, and agent safety. | `npx skills add PrunaAI/pruna-skills@pruna-api -y` |

Or install the full suite once: `npx skills add PrunaAI/pruna-skills@pruna -y`

Follow each skill's **Before generating** / craft sections — do not restate guide content here.

## Agent habit

In the **first reply**, name `` `gemini-3.1-flash-tts` `` in backticks, confirm `REPLICATE_API_TOKEN` (or stop with signup links from `pruna-api`), then ask for required inputs. Open intake → **`generation-diversity`** clarification intake (locale, voice, script) before the first `POST`. Redirect when **When NOT to use** fits better.

## When NOT to use

Use a different skill instead:

| Skill | Description | Install |
| --- | --- | --- |
| `p-video-avatar` | Use when someone wants a person on camera speaking a script — lip-synced host, spokesperson, or narrated avatar from a portrait photo. | `npx skills add PrunaAI/pruna-skills@p-video-avatar -y` |
| `music-2.5` | Use when someone wants an original AI song with vocals — sung lyrics, a style prompt track, or source audio for a music video. | `npx skills add PrunaAI/pruna-skills@music-2.5 -y` |
| `stable-audio-2.5` | Use when someone wants light instrumental background music — an ambient bed under dialogue or underscore for reels and explainers. | `npx skills add PrunaAI/pruna-skills@stable-audio-2.5 -y` |

## Environment

```bash
export REPLICATE_API_TOKEN=r8_...
```

Requires **`ffmpeg`** / **`ffprobe`** when trimming, concatenating scene VO, or mixing with a bed.

## HTTP (curl)

```bash
curl -s -X POST \
  -H "Authorization: Bearer ${REPLICATE_API_TOKEN}" \
  -H "Content-Type: application/json" \
  -d '{
    "input": {
      "text": "[warmly] The plush went flying. [short pause] And then it was gone.",
      "voice": "Sulafat",
      "prompt": "Warm storybook narrator, gentle pace, empathetic, no announcer voice.",
      "language_code": "en-US"
    }
  }' \
  "https://api.replicate.com/v1/models/google/gemini-3.1-flash-tts/predictions"
```

Poll `urls.get` until `status` is `succeeded`; download `output` (audio URL). Shared client: follow `pruna-api` (Replicate HTTP in the tool skill).

## Before generating

1. Complete Prerequisites guide reading order.
2. Confirm **`text`**, **`voice`**, **`prompt`**, and **`language_code`** with the user. **`text`**, **`prompt`**, and inline `[tags]` must **align** — same emotional direction (see `audio-prompting` tts-style-prompting). When listing fields, name **`REPLICATE_API_TOKEN`** (Replicate — not `PRUNA_API_KEY`).
3. **Model notes:** combined `text` + `prompt` ≤ ~8,000 bytes; output capped ~655s. When TTS feeds **`p-video`** as `input.audio`, keep each line **≤ ~19s** (`ffprobe`) — P-API clips audio at **20s**. Common voices: `Kore`, `Aoede`, `Sulafat`, `Achird`, `Charon`, `Puck`, `Vindemiatrix` — full list on the [Replicate readme](https://replicate.com/google/gemini-3.1-flash-tts/readme).

## Required input

- `text` (string) — spoken copy; supports inline `[tags]`. Max ~4,000 bytes.

## Common optional fields

- `voice` (default `Kore`)
- `prompt` — style / director notes (max ~4,000 bytes)
- `language_code` — BCP-47 (default `en-US`)

Inline tags (examples): `[sigh]` `[laughing]` `[whispering]` `[short pause]` `[medium pause]` `[long pause]` `[excitedly]`.

## Typical next steps

Common follow-ons after this skill:

| Skill | Description | Install |
| --- | --- | --- |
| `p-video` | Use when someone wants a simple short clip from text or images — quick B-roll, drafts, or start/end frame animation. Not when the brief needs the highest quality or tight lip-sync. | `npx skills add PrunaAI/pruna-skills@p-video -y` |
| `p-video-avatar` | Use when someone wants a person on camera speaking a script — lip-synced host, spokesperson, or narrated avatar from a portrait photo. | `npx skills add PrunaAI/pruna-skills@p-video-avatar -y` |
| `stable-audio-2.5` | Use when someone wants light instrumental background music — an ambient bed under dialogue or underscore for reels and explainers. | `npx skills add PrunaAI/pruna-skills@stable-audio-2.5 -y` |
| `narrated-multi-scene` | Use when someone wants a multi-part story with voiceover — episodic B-roll, chaptered promo, or several linked video scenes without on-camera dialogue. | `npx skills add PrunaAI/pruna-skills@narrated-multi-scene -y` |
| `video-editing` | Use when assembling or polishing already-rendered clips with ffmpeg — concat, crossfades, burned captions and subtitles, text/logo overlays, before/after sliders, background music beds, platform export — or when composing a multi-layer HTML combination video with Hyperframes. Not for AI video generation, prompt craft, or model-based video edits. | `npx skills add PrunaAI/pruna-skills@video-editing -y` |