openverse-sfx SKILL.md skillA
openverse-sfx from varnan-tech/opendirectory is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add varnan-tech/opendirectory/openverse-sfx@v1.0.0Pins v1.0.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- varnan-tech/opendirectory
- Path
skills/openverse-sfx/SKILL.md- Versions recorded
- 1
- Latest version
- v1.0.0, committed Oct 17, 2026
- Size
- 6,425 bytes
- Repository stars
- 699
- License
- MIT
Add a licensed soundtrack to any video for $0 with beat-matched music, Openverse sound effects, -16 LUFS mastering, and FFmpeg verification. Searches 5.2M free CC0/CC-BY/public-domain audio files (no API key), aligns cuts to the kick-drum beat grid with librosa, peak-normalizes SFX one-shots, verifies the exported MP4 with ebur128 and cue frame grabs, and auto-writes credits.txt. Trigger when the user says "add sound to this video", "add music to my video", "add sound effects…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# openverse-sfx: Free Licensed Sound Design for Video, Verified by Measurement You cannot hear. Every decision in this skill is made by measurement (`librosa`, `ffmpeg ebur128`, waveform plots) and verified on the exported file - never by feel, and **never tell the user it sounds good**. Hand them a short list of timestamps to check with headphones instead. All audio comes from Openverse (`https://api.openverse.org`): 5.2M free audio files, no API key, $0. **Never synthesize music or sound effects in code** - no sine-wave beeps, no noise bursts. Use real licensed recordings only. --- ## Critical Rules 1. **License filter is mandatory.** Only use Openverse results with `license=cc0,by,pdm` and `source=freesound,jamendo`. `scripts/sfx_search.py` enforces this - do not bypass it. 2. **One search per kind of sound.** Anonymous Openverse use is limited to ~200 searches/day. Search once per sound kind (`"whoosh"`, `"ui pop"`, `"upbeat loop"`) and pick from the shortlist. Do not re-search with rephrased queries. …
Read the whole file at its exact version.
How to install
mdr add varnan-tech/opendirectory/openverse-sfx@sha256:3407e1f8465dcaceThe line at the top of this page pins the label v1.0.0, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_4z2gavbzbk7z6q2s)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Oct 17, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (6425 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
varnan-tech/opendirectory · 699 stars · license MIT · pushed 2026-10-17 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_4z2gavbzbk7z6q2s GET https://markdownregistry.com/api/v1/resolve?ref=varnan-tech/opendirectory/openverse-sfx GET https://markdownregistry.com/api/v1/blob/3407e1f8465dcace75eeb1c23f7f18d470bef5c6a65f4b15fa981f8c055d2fef
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.