What is add-tts-engine?

A development skill for adding a text-to-speech engine to Voicebox. Text-to-speech turns written text into spoken audio, and the skill covers the engine, user interface, packaged application, and frozen-build testing.

Use it to research an engine, connect it to the backend and interface, update dependencies and build files, bundle it with PyInstaller, and test the finished build.

It provides a staged path for checking dependencies and making sure a new speech engine works both during development and in the packaged app.

How jamiepine/voicebox configures Claude Code and Codex

About the project

Voicebox is a local AI voice studio that clones voices, generates speech, and turns spoken input into text on a computer. People use it for dictation, voice creation, and giving MCP-compatible agents spoken output. The catalogue add-ons support workflows around operating Voicebox.

jamiepine/voicebox · 59,479 stars · on GitHub · voicebox.sh

Reuse

Borrowing it

Nothing to install: this file belongs to jamiepine/voicebox. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/jamiepine/voicebox/main/.agents/skills/add-tts-engine/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/jamiepine/voicebox

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/jamiepine/voicebox/add-tts-engine/github.svg)](https://agentmods.dev/skills/jamiepine/voicebox/add-tts-engine)

Your own site

<a href="https://agentmods.dev/skills/jamiepine/voicebox/add-tts-engine"><img src="https://agentmods.dev/badge/skills/jamiepine/voicebox/add-tts-engine/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/jamiepine/voicebox/add-tts-engine"><img src="https://agentmods.dev/badge/skills/jamiepine/voicebox/add-tts-engine.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 56 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,308 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

Snyk warn 7 Sept 2026
NVIDIA SkillSpector pass 7 Sept 2026

How audits are shown

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00056	$0.01308
Opus 5.5	$0.00022	$0.00523
Sonnet 5.5	$0.00011	$0.00262
Haiku 4.5	$0.00006	$0.00131

Measured 2mo ago against content hash ac1d6d859938, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

add-tts-engine scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

add-tts-engine — 100% identical, 0 lines differ

.agents/skills/add-tts-engine/SKILL.md · 121 lines

How it starts

The opening of the file, as written. The whole thing — 121 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Add TTS Engine

Goal

Integrate a new text-to-speech engine into Voicebox end-to-end: dependency research, backend protocol implementation, frontend UI wiring, PyInstaller bundling, and frozen-build verification. The user should only need to test the final build locally.

Reference Doc

The full phased guide lives at docs/content/docs/developer/tts-engines.mdx. Read this file in its entirety before starting. It contains:

Phase 0: Dependency research (mandatory before writing code)
Phase 1: Backend implementation (TTSBackend protocol)
Phase 2: Route and service integration (usually zero changes)
Phase 3: Frontend integration (5 files)
Phase 4: Dependencies (requirements.txt, justfile, CI, Docker)
Phase 5: PyInstaller bundling (build_binary.py + server.py)
Phase 6: Common upstream workarounds
Implementation checklist (gate between phases)

Workflow

1. Read the guide

# Read the full TTS engines doc
cat docs/content/docs/developer/tts-engines.mdx

Internalize all phases, especially Phase 0 and Phase 5. The v0.2.3 release was three patch releases because Phase 0 was skipped.

2. Dependency research (Phase 0)

Clone the model library into a temporary directory and audit it. Do NOT skip this.

mkdir /tmp/engine-research && cd /tmp/engine-research
git clone <model-library-url>

Run the grep searches from Phase 0.2 in the guide against the cloned source and its transitive dependencies. Produce a written dependency audit covering:

PyPI vs non-PyPI packages
PyInstaller directives needed (--collect-all, --copy-metadata, --hidden-import)
Runtime data files that must be bundled
Native library paths that need env var overrides in frozen builds
Monkey-patches needed (torch.load, float64, MPS, HF token)
Sample rate
Model download method (from_pretrained vs snapshot_download + from_local)

Test model loading and generation on CPU in the throwaway venv before proceeding.

3. Implement (Phases 1–4)

Read the full file on GitHub · 121 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 121 lines · 56 tokens per session scan A ac1d6d859938

Subscribe to this mod's changes

add-tts-engine is a skill published in the GitHub repository jamiepine/voicebox (59,479 stars, last pushed 1mo ago), licensed MIT. It adds 56 tokens to every session and 1,308 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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add-tts-engine next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
add-tts-enginejamiepine/voicebox	Skill	59k	1mo ago	MIT	A	56	Claude Code, Codex
voicestudio-maintainerdebpalash/VoiceStudio	Skill	102k	today	AGPL-3.0	A	50	Claude Code, Codex
voicestudiodebpalash/VoiceStudio	Skill	102k	today	AGPL-3.0	A	55	Claude Code, Codex
remotion-videoericrisco/rsc-harness	Skill	503	2d ago	MIT	A	116	Claude Code, Codex
transcribe-toolxuiltul/animaworks	Skill	269	yesterday	Apache-2.0	A	49	Claude Code, Codex
txtify-transcribelkmeta/txtify	Skill	135	10d ago	Apache-2.0	A	88	Claude Code, Codex
kb-to-mptanbeime/skill	Skill	9.2k	yesterday	none	A	102	Claude Code, Codex

voicebox: Skill for Claude Code