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.
npx skills add saranambiar/hyperframes-video-agent-skills --skill captions-and-music-bedgit clone --depth 1 https://github.com/saranambiar/hyperframes-video-agent-skillsWrote 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.
[](https://agentmods.dev/skills/saranambiar/hyperframes-video-agent-skills/captions-and-music-bed)<a href="https://agentmods.dev/skills/saranambiar/hyperframes-video-agent-skills/captions-and-music-bed"><img src="https://agentmods.dev/badge/skills/saranambiar/hyperframes-video-agent-skills/captions-and-music-bed/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.
<a href="https://agentmods.dev/skills/saranambiar/hyperframes-video-agent-skills/captions-and-music-bed"><img src="https://agentmods.dev/badge/skills/saranambiar/hyperframes-video-agent-skills/captions-and-music-bed.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00073 | $0.00851 |
| Opus 5 | $0.00036 | $0.00426 |
| Sonnet 5 | $0.00015 | $0.00170 |
| Haiku 4.5 | $0.00007 | $0.00085 |
Grade A, and why
captions-and-music-bed 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 11d 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.
How it starts
The opening of the file, as written. The whole thing — 151 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Captions And Music Bed
Use this skill after the narration timeline is stable.
Captions
Caption source rules:
- Use the user's script as wording source.
- Use the final narration-only master as timing source.
- Preserve punctuation and capitalization.
- Show one caption line at a time.
- Start the caption when the first word is spoken.
- Avoid captions over silent hooks or silent CTA holds unless requested.
Preview style before burning the full video when style changes.
Read references/caption-rules.md for timing and style guidance.
Caption Style Defaults
- Bottom center.
- White text.
- Translucent dark backing.
- Generous bottom margin.
- Font size small enough not to dominate UI.
- One line only; split long sentences into natural phrase chunks.
Use templates/caption-style.ass as a starter.
Music Bed
Music source rules:
- Start from a chosen offset when the intro of the source track is weak.
- Keep hook music audible if there is no voiceover.
- Duck under narration.
- Do not raise music during later narration pauses if the user says it is distracting.
- End music at the requested time, including final silence if requested.
- If the music source ends early, restart from a musically useful tail section.
Read references/music-ducking.md for FFmpeg patterns.
QA
- Listen to start, middle, and final tail.
- Check music is present and audible, not merely technically in the stream.
- Confirm no clipped narration.
- Confirm captions are not late by several words.
- Extract a caption proof frame from a visually busy scene.
- Probe final audio stream.
Output
Return:
- Caption file path.
- Caption preview frame.
- Music bed strategy.
- Final mixed video path.
- Audio/caption checks performed.
Caption Chunking Rules
Split captions by:
- Natural phrase boundaries.
- Breath points.
- Punctuation.
- Maximum line length.
- Visual complexity behind the caption.
Do not split in a way that changes meaning. Do not add punctuation that the script does not contain.
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 11d ago First seen · 151 lines · 73 tokens per session scan A ef0d2a265f54
captions-and-music-bed is a skill published in the GitHub repository saranambiar/hyperframes-video-agent-skills (47 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 73 tokens to every session and 851 once invoked, about $0.0004 per session on Opus 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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