A workflow for adding music or spoken narration to a video, or generating audio files on their own. It produces a re-rendered video soundtrack or standalone music and narration files.

Use it to make a soundtrack, voiceover, narration, short music sting, jingle, or other standalone audio asset.

It gives video and audio work a defined process for writing voice lines, choosing music, checking timing, and handling the required audio service connection.

audio-track — Skill for Claude Code by ucsandman/marketing-studio

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add ucsandman/marketing-studio --skill audio-track

Clone the repo

git clone --depth 1 https://github.com/ucsandman/marketing-studio

Made for: Claude Code.

Or install marketing-studio, the plugin that ships this one along with the rest of its 15 skills.

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/ucsandman/marketing-studio/audio-track/github.svg)](https://agentmods.dev/skills/ucsandman/marketing-studio/audio-track)

Your own site

<a href="https://agentmods.dev/skills/ucsandman/marketing-studio/audio-track"><img src="https://agentmods.dev/badge/skills/ucsandman/marketing-studio/audio-track/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/ucsandman/marketing-studio/audio-track"><img src="https://agentmods.dev/badge/skills/ucsandman/marketing-studio/audio-track.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 79 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,192 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

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	$0.00079	$0.01192
Opus 5.5	$0.00032	$0.00477
Sonnet 5.5	$0.00016	$0.00238
Haiku 4.5	$0.00008	$0.00119

Measured 2mo ago against content hash 399821b37926, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

audio-track 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.

skills/audio-track/SKILL.md · 72 lines

How it starts

The opening of the file, as written. The whole thing — 72 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Audio Track

REQUIRED BACKGROUND: marketing-studio skill. Work in ${CLAUDE_SKILL_DIR}/../... Read ${CLAUDE_SKILL_DIR}/../../docs/playbook/audio.md first (endpoints, ducking, manifest contract).

Every film gets this pass; it is not opt-in (CLAUDE.md: a film is not done without audio, and audio means narration). node scripts/check-audio.mjs <brand> --project <product> is the exit gate for all three recipes that touch video.

Three modes; pick by what the target is:

Bespoke film (studio/src/films/<brand>/, e.g. PostflopFilm) — post-render scoring with scripts/build-<brand>-film-audio.mjs + scripts/score-film.mjs. Recipe A0.
Video soundtrack — a directed LaunchVideo composition scored with music and voiceover inside the product workspace. Recipe A.
Standalone audio — a music track and/or narration mp3s delivered as files (a sting, a jingle, a narration for something outside this studio). Recipe B.

Both need ELEVENLABS_API_KEY in the repo .env (missing key = feeder exits 2; videos stay silent). Generation costs real money: one pass, trim copy rather than regenerate blindly. Free tier returns 402; Starter or above required.

Recipe A0: bespoke film

Shared-repo guard + toolchain per marketing-studio.
Copy source of truth: scripts/build-<brand>-film-audio.mjs (copy postflop's). Narration lines carry the film SECOND they start on, computed from the film's timeline.ts so a re-timed shot moves its line with it; SFX cues carry the frame the shot lands something on (Stamp/Rule/click constants + the shot's from), max two per beat. Budget ~2.6 words/second minus a 150ms breath per line.
Run it (VO lines and the exact-length bed hit the API once; re-runs reuse files, --force <id,...|music> regenerates). Read the printed start/end table: every line inside its shot.
node scripts/score-film.mjs <brand> <product-film> --project <product> — refuses overlapping lines (trim copy, re-run the builder) and zero-VO manifests; masters by measured gain and verifies the DELIVERED file (I within 0.5 of TARGET_I, TP <= -1).
Listen-proof: node scripts/verify-cue.mjs <scored.mp4> <voStart> <voDur> on one narration window and one bed-only window (voice ~6 dB above the bed), then node scripts/check-audio.mjs <brand> --project <product> (exit 0), then SEND the scored file.

Read the full file on GitHub · 72 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 Changed 399821b37926
2mo ago Changed · +1 lines c716fdc8d421
2mo ago Changed · +25 lines 17f43a3ced36
2mo ago First seen · 46 lines · 79 tokens per session scan A be853484b255

Subscribe to this mod's changes

audio-track is a skill published in the GitHub repository ucsandman/marketing-studio (255 stars, last pushed 2mo ago), licensed MIT. It adds 79 tokens to every session and 1,192 once invoked, about $0.0003 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.

Claude Code Creative and media ai-agents blender marketing remotion video-generation

audio-track next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
audio-trackucsandman/marketing-studio	Skill	255	2mo ago	MIT	A	79	Claude Code
saas-product-demo-videonoamdorr/saas-product-demo-video	Skill	69	yesterday	MIT	A	130	Claude Code
seedance-promptsideshowroberto/vfx-agent-toolkit	Skill	17	yesterday	MIT	A	68	Claude Code
ccvideoAmazingAng/ccvideo	Skill	21	3mo ago	MIT	A	59	Claude Code, Codex
remotion-video-workflowshaom/infocard-video-skills	Skill	4	7mo ago	MIT	A	50	Codex
html-ppt-zhangzara-coralnexu-io/open-design	Skill	107k	today	Apache-2.0	A	55	Claude Code, Codex
adscoreyhaines31/marketingskills	Skill	59k	yesterday	MIT	A	239	Claude Code