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The SFX pass. Analyze a short's beats + narration and propose tasteful sound effects synced to them, drawing from (and growing) a shared, reusable SFX library, then render an SFX-mixed audition preview. Use when the user wants to "add SFX / sound effects", "suggest sfx", "score t
The SFX pass. Analyze a short's beats + narration and propose tasteful sound effects synced to them, drawing from (and growing) a shared, reusable SFX library, then render an SFX-mixed audition preview. Use when the user wants to "add SFX / sound effects", "suggest sfx", "score the transitions", "sound-design this beat", generate/source sound effects, build or extend the sfx library/catalog, author or audit a sfx-plan, or mix SFX over a rendered short in this repo. Covers reading beats + word times + brand §7, the library-first flow, generating misses with the ElevenLabs Sound Effects API, the per-video sfx-plan.json, the hard user-audit gate, and mixing with tools/mix_sfx.py (light voice ducking).
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Take a rendered, voiced short and add tasteful sound effects, synced to the visual beats and the narration, drawn from a shared, growing SFX library. Work collaboratively and beat-by-beat; the user audits the plan and gives notes.
The shape: a declarative plan (sfx-plan.json) is the source of truth → a tool consumes it
(tools/mix_sfx.py) → a library grows (media/library/sfx/) → a hard USER-AUDIT gate
before anything is mixed.
Sound taste is a brand contract — read brand.md §7 every time. The house style is calm/premium
(Linear / Anthropic / Vercel), felt-not-heard, always under the voice. NOT MrBeast-loud.
brand.md §7 (Sound design) — the SFX taste contract: subtlety, density, palette, levels,
sync, signature motifs, source policy. Non-negotiable.shorts/short-N-<niche>/beats.json — the beats and REAL per-word voice times (written back
by gen_voice.py). Sync cues to these words (a pop on "boom", a chime on "free").remotion/src/shots/short-N/*.tsx — the INTERNAL animation frames are where
the real visual beats are (piece lands, digit pops, badge stamps). Read the shot, convert its
local frame to global time: at_s = (local_frame + sequence_from) / fps. Do not guess — the
cue must land on the exact frame the thing happens.media/library/sfx/catalog.json + palette.json — the library you draw from and grow.media/library/sfx/) — the durable assetpalette.json — generation recipes: generic, reusable sound ids + prompts + duration + tags.
The source of truth for what the library SHOULD contain.catalog.json — the manifest of what EXISTS: {id, file, category, tags, duration_s, peak_dbfs, loudness_lufs, source, model, license, prompt, used_in} per clip. Written by gen_sfx.py.clips/*.mp3 — loudness-normalized clips (~−20 LUFS, −1.5 dBFS ceiling) so a plan's per-cue
gain_db is perceptually meaningful.ui-toggle-on, whoosh-soft, pop-reveal) so future videos reuse them — the library is the
durable asset, each video is one draw from it. Only genuinely-missing sounds get added to
palette.json and generated."optional": true. Layer the 2–3 biggest moments
(build-and-drop): riser→impact on a scripted reveal, whoosh→pop so a cut stands out — in the
plan a layer is two events at the same/adjacent at_s that sum. Sync each cue to the VISUAL
beat and often the exact word.palette.json and generate: python tools/gen_sfx.py
(ElevenLabs Sound Effects API → normalized clip → catalog). Fall back to curated royalty-free
only where generation is weak; record source + license either way.shorts/short-N-<niche>/sfx-plan.json — one event per cue, at_s in global seconds.
(Schema below.)python tools/mix_sfx.py <plan> --print) and get the user's approval/notes BEFORE mixing.python tools/mix_sfx.py shorts/short-N-<niche>/sfx-plan.json
→ the plan's render.out. Light sidechain duck under the voice + a safety limiter. Iterate on
the user's notes (gains, timing, add/cut cues) — re-print, re-mix.
gain_db must be than the brand
table implies. The audibility check above is what surfaces this.{
"master": "remotion/out/ShortNName-voiced.mp4", "master_fps": 30,
"catalog": "media/library/sfx/catalog.json",
"render": {
"preview": "remotion/out/ShortNName-voiced.mp4", // the voiced render to mix over
"out": "shorts/short-N-<niche>/output/short-N-sfx.mp4",
"end_s": 42, "duck": true
},
"events": [
{ "at_s": 4.9, "sfx_id": "chess-piece-thock", "gain_db": -8, "shot": "MainScene",
"cue": "e4 pawn lands (local f51)", "note": "diegetic board foley" },
{ "at_s": 13.03, "sfx_id": "ui-click-soft", "gain_db": -18, "optional": true, "cue": "card locks" }
]
}
at_s — global-timeline seconds (same clock as beats.json).gain_db — dB relative to the clip's normalized level (lower = quieter). See the SHORTS
calibration above for starting values.optional: true — deniable texture; mix_sfx.py --no-optional drops it. Use it liberally so
the audit is about the core set.cue / note — human-readable anchor (the exact frame/word) so the audit is legible.python tools/gen_sfx.py [--dry-run] [--only id1,id2] [--force] [--renorm].
--renorm re-balances existing clips to the loudness target (no API/billing). Needs
ELEVENLABS_API_KEY in .env.python tools/mix_sfx.py <plan> --print [--no-optional].python tools/mix_sfx.py <plan> [--no-optional] [--no-duck] [--end S] [--out path].optional.sfx-plan.json first. Non-negotiable.Done = the library has the needed clips (catalogued with source+license), sfx-plan.json is
authored and audited by the user, the SFX-mixed preview is rendered and spot-checked by ear,
and any new clips + used_in are saved back to the library.
name: suggest-sfx description: The SFX pass. Analyze a short's beats + narration and propose tasteful sound effects synced to them, drawing from (and growing) a shared, reusable SFX library, then render an SFX-mixed audition preview. Use when the user wants to "add SFX / sound effects", "suggest sfx", "score the transitions", "sound-design this beat", generate/source sound effects, build or extend the sfx library/catalog, author or audit a sfx-plan, or mix SFX over a rendered short in this repo. Covers reading beats + word times + brand §7, the library-first flow, generating misses with the ElevenLabs Sound Effects API, the per-video sfx-plan.json, the hard user-audit gate, and mixing with tools/mix_sfx.py (light voice ducking).
---
name: suggest-sfx
description: The SFX pass. Analyze a short's beats + narration and propose tasteful sound effects synced to them, drawing from (and growing) a shared, reusable SFX library, then render an SFX-mixed audition preview. Use when the user wants to "add SFX / sound effects", "suggest sfx", "score the transitions", "sound-design this beat", generate/source sound effects, build or extend the sfx library/catalog, author or audit a sfx-plan, or mix SFX over a rendered short in this repo. Covers reading beats + word times + brand §7, the library-first flow, generating misses with the ElevenLabs Sound Effects API, the per-video sfx-plan.json, the hard user-audit gate, and mixing with tools/mix_sfx.py (light voice ducking).
---
# suggest-sfx — the SFX pass
Take a rendered, voiced short and add **tasteful sound effects**, synced to the visual beats and
the narration, drawn from a **shared, growing SFX library**. Work **collaboratively and
beat-by-beat**; the user audits the plan and gives notes.
The shape: a **declarative plan** (`sfx-plan.json`) is the source of truth → a **tool** consumes it
(`tools/mix_sfx.py`) → a **library** grows (`media/library/sfx/`) → a **hard USER-AUDIT gate**
before anything is mixed.
Sound taste is a brand contract — read **`brand.md` §7** every time. The house style is calm/premium
(Linear / Anthropic / Vercel), felt-not-heard, always under the voice. NOT MrBeast-loud.
## Inputs (read these first, every session)
- **`brand.md` §7 (Sound design)** — the SFX taste contract: subtlety, density, palette, levels,
sync, signature motifs, source policy. Non-negotiable.
- **`shorts/short-N-<niche>/beats.json`** — the beats and REAL per-word voice times (written back
by `gen_voice.py`). Sync cues to these words (a pop on "boom", a chime on "free").
- **The shot source** `remotion/src/shots/short-N/*.tsx` — the INTERNAL animation frames are where
the real visual beats are (piece lands, digit pops, badge stamps). Read the shot, convert its
local frame to global time: `at_s = (local_frame + sequence_from) / fps`. Do not guess — the
cue must land on the exact frame the thing happens.
- **`media/library/sfx/catalog.json`** + **`palette.json`** — the library you draw from and grow.
## The library (`media/library/sfx/`) — the durable asset
- `palette.json` — generation recipes: generic, reusable sound ids + prompts + duration + tags.
The source of truth for what the library SHOULD contain.
- `catalog.json` — the manifest of what EXISTS: `{id, file, category, tags, duration_s, peak_dbfs,
loudness_lufs, source, model, license, prompt, used_in}` per clip. Written by `gen_sfx.py`.
- `clips/*.mp3` — loudness-normalized clips (~−20 LUFS, −1.5 dBFS ceiling) so a plan's per-cue
`gain_db` is perceptually meaningful.
- **Library-first, always.** Reuse an existing clip before generating. Name/tag clips GENERICALLY
(`ui-toggle-on`, `whoosh-soft`, `pop-reveal`) so future videos reuse them — the library is the
durable asset, each video is one draw from it. Only genuinely-missing sounds get added to
`palette.json` and generated.
## Workflow
1. **Read** brand §7 + beats.json + the shot source + catalog. Pull exact cue times: for each
candidate beat, find the visual moment's local frame in the shot and/or the narration word,
and convert to global seconds.
2. **Decide taste with the user up front** if unsettled (present-ness, density, which kinds,
source) — then apply brand §7. Don't re-ask settled decisions.
3. **Propose the cue list — function-first.** For each beat ask what it needs (brand §7): **motion**
(whoosh) · **tension** (riser) · **emphasis** (impact/pop) · **snap** (click). Score key
transitions, reveals, and tasteful click-sequences; a 3–4-shot click-sequence counts as ONE
gesture. Mark genuinely deniable texture as `"optional": true`. **Layer the 2–3 biggest moments**
(build-and-drop): riser→impact on a scripted reveal, whoosh→pop so a cut stands out — in the
plan a layer is two events at the same/adjacent `at_s` that sum. Sync each cue to the VISUAL
beat and often the exact word.
4. **Library-first sourcing.** For each distinct sound the plan needs, reuse a catalog clip if one
fits. For misses, add a generic recipe to `palette.json` and generate: `python tools/gen_sfx.py`
(ElevenLabs Sound Effects API → normalized clip → catalog). Fall back to curated royalty-free
only where generation is weak; record `source` + `license` either way.
5. **Author `shorts/short-N-<niche>/sfx-plan.json`** — one event per cue, `at_s` in global seconds.
(Schema below.)
6. **USER-AUDIT GATE (hard).** Present the resolved cue sheet
(`python tools/mix_sfx.py <plan> --print`) and get the user's approval/notes BEFORE mixing.
7. **Mix the audition preview** once approved: `python tools/mix_sfx.py shorts/short-N-<niche>/sfx-plan.json`
→ the plan's `render.out`. Light sidechain duck under the voice + a safety limiter. Iterate on
the user's notes (gains, timing, add/cut cues) — re-print, re-mix.
- **Verify audibility with numbers, not hope.** After mixing, RMS-diff the mixed audio vs the
voice-only preview at each cue window: a story-critical cue should add **≥ +4 dB**, texture
+1–3 dB. Inaudible cues hide in cue sheets — don't ship a cue you haven't confirmed lands.
- **Transient-clip gain gotcha.** Short percussive clips (knock/stamp/keys/snap) hit the
−1.5 dBFS peak ceiling BEFORE reaching the −20 LUFS loudness target, so they catalog ~3–5 dB
quieter than sustained clips. Their plan `gain_db` must be **~3–5 dB higher** than the brand
table implies. The audibility check above is what surfaces this.
- **SHORTS calibration.** Under a short's near-continuous narration (~2.7 w/s, few gaps) a
conservative gain table is **4–8 dB too quiet across the board** — the duck + voice masking
eat everything. Proven landing zone: transitions/whooshes **−3**, story pops/impacts **0..+3**,
stamps/snaps **0..+7**, layered-hero risers **0..+2**. Start a short's plan there.
- **Cues that sit fully UNDER continuous speech never measure — accept felt-not-heard or cut
them.** The sidechain duck suppresses quiet clips the whole time the voice is active (a
click-sequence can measure +0 dB at ANY gain). Set such cues at a sane +6-ish and let them
live in the word gaps, or delete them; do NOT chase them with gain (a pause would make them
spike).
- **Measure transients with tight windows.** RMS over 0.6s dilutes a 50 ms click to nothing and
an adjacent loud cue can leak in and fake a pass. Use ~0.3s windows for snap/pop/zap/stamp,
and measure a riser at its final third (its energy is at the END).
- **A noisy TEXTURE cannot be fixed by gain.** Static/glitchy/hummy clips read as NOISE over
speech even at −4 dB; lowering them just makes quiet noise. If the user says "noisy", swap the
sound's CHARACTER (clean mechanical snap) or use silence — see brand §7 "no static/glitch
textures under narration".
8. **Save back.** New clips stay in the library + catalog (they carry to the next video). Update
`used_in`.
## sfx-plan.json (the source of truth)
```jsonc
{
"master": "remotion/out/ShortNName-voiced.mp4", "master_fps": 30,
"catalog": "media/library/sfx/catalog.json",
"render": {
"preview": "remotion/out/ShortNName-voiced.mp4", // the voiced render to mix over
"out": "shorts/short-N-<niche>/output/short-N-sfx.mp4",
"end_s": 42, "duck": true
},
"events": [
{ "at_s": 4.9, "sfx_id": "chess-piece-thock", "gain_db": -8, "shot": "MainScene",
"cue": "e4 pawn lands (local f51)", "note": "diegetic board foley" },
{ "at_s": 13.03, "sfx_id": "ui-click-soft", "gain_db": -18, "optional": true, "cue": "card locks" }
]
}
```
- `at_s` — global-timeline seconds (same clock as beats.json).
- `gain_db` — dB relative to the clip's normalized level (lower = quieter). See the SHORTS
calibration above for starting values.
- `optional: true` — deniable texture; `mix_sfx.py --no-optional` drops it. Use it liberally so
the audit is about the core set.
- `cue` / `note` — human-readable anchor (the exact frame/word) so the audit is legible.
## Tooling quick reference
- Grow the library: `python tools/gen_sfx.py [--dry-run] [--only id1,id2] [--force] [--renorm]`.
`--renorm` re-balances existing clips to the loudness target (no API/billing). Needs
`ELEVENLABS_API_KEY` in `.env`.
- Print the cue sheet (the audit artifact): `python tools/mix_sfx.py <plan> --print [--no-optional]`.
- Mix: `python tools/mix_sfx.py <plan> [--no-optional] [--no-duck] [--end S] [--out path]`.
## Principles (the house style — apply them)
- **Under the voice, always.** SFX are seasoning; the voice is the show. Duck them, keep them
quiet, never let one peak above the narration. Silence is part of the mix.
- **Key transitions & reveals only** — plus the diegetic action sounds that ARE a synthetic short's
content (piece thocks, digit pops). Everything past that is `optional`.
- **Sync to the visual beat AND the word.** A click exactly on the toggle flip; a pop exactly on
the reveal. Off-by-100ms reads as sloppy — use real frame/word times.
- **Reusable-first.** Generic names + tags so the library compounds across videos. Reuse before
you generate. The library is the deliverable that outlives this video.
- **Function over vibe.** Pick the sound by its job — motion/tension/emphasis/snap (brand §7) —
not by browsing the catalog for something that "feels right." The same few foundational sounds
do the heavy lifting; more is not better. Keep signature motifs consistent.
- **Layer the big moments, keep the rest single.** Build-and-drop (riser→impact, whoosh→pop) is
where SFX earn their keep — but only on the 2–3 hero beats.
- **Take structure, not drama.** Calm/premium: no cymbal-urgency risers, no trailer slams, no
whoosh on every move.
- **Audit before mixing.** The user reads and approves `sfx-plan.json` first. Non-negotiable.
Done = the library has the needed clips (catalogued with source+license), `sfx-plan.json` is
authored and **audited by the user**, the SFX-mixed preview is rendered and spot-checked by ear,
and any new clips + `used_in` are saved back to the library.
Skill source recorded
Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.
Review before install: Avoid automatic install
License: MIT
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Check the source for dependencies, API keys and third-party costs. A public repository does not mean every service is free.
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Quality
67/100
Promising
Trust
65/100
This page exposes the same decision, trust, audit, use-case, and install signals through the Registry API, so agents can rank this skill without scraping the UI.
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"license": "MIT",
"repository": "https://github.com/hassancs91/claude-faceless-shorts-creator/tree/main/.claude/skills/suggest-sfx",
"install": "npx skills add hassancs91/claude-faceless-shorts-creator --skill suggest-sfx",
"installSafety": "standard package or runtime install path",
"permissionSurface": "secrets or environment access, filesystem or document access",
"documentation": "Usable metadata, review docs",
"agentOutcomes": "No agent outcome data yet"
},
"outcome_evidence": {
"total": 0,
"successes": 0,
"failures": 0,
"not_relevant": 0,
"success_rate": null,
"recent_success_rate": null,
"recent_failure_rate": null,
"install_attempts": 0,
"install_success_rate": null,
"risk_blocked": 0,
"setup_required": 0,
"avg_output_quality": null,
"production_outcomes": 0,
"last_outcome_at": null,
"label": "No agent outcome data yet"
},
"auto_install": {
"allowed": false,
"sandbox_required": true,
"reason": "Do not auto-install. Inspect the source, dependencies, and permission surface first."
},
"best_for": [
"security",
"agent-skill"
],
"known_risks": [
"This skill may touch real-money trading, broker, wallet, or exchange operations; use only in a sandbox with explicit approval.",
"Quality score needs review",
"Permission surface needs review: secrets or environment access, filesystem or document access",
"Permission surface: secrets or environment access, filesystem or document access"
]
},
"agent_proven": {
"version": "agent-proven-v1",
"score": 0,
"tier": "unproven",
"label": "Needs first agent run",
"summary": "No agent outcome reports yet. Use Resolve, run one narrow sandbox task, then report the result.",
"metrics": {
"totalOutcomes": 0,
"successfulOutcomes": 0,
"failedOutcomes": 0,
"installAttempts": 0,
"installSuccessRate": null,
"successRate": null,
"recentSuccessRate": null,
"recentFailureRate": null,
"riskBlocked": 0,
"setupRequired": 0,
"notRelevant": 0,
"avgOutputQuality": null,
"avgTimeToUsefulMs": null,
"productionOutcomes": 0,
"humanReviewRequired": 0,
"uniqueAgents": 0,
"lastOutcomeAt": null
},
"signals": [],
"penalties": [
"No real agent outcome evidence yet"
]
},
"audit": {
"score": 77,
"risk_level": "risky",
"risk_label": "Risky",
"warnings": [
"Permission surface may require sandboxing",
"Potential broker, wallet, exchange, or real-money execution surface; sandbox and explicit approval are required",
"This skill may touch real-money trading, broker, wallet, or exchange operations; use only in a sandbox with explicit approval.",
"Quality score needs review",
"Permission surface needs review: secrets or environment access, filesystem or document access",
"Permission surface: secrets or environment access, filesystem or document access"
]
},
"safety_gate": {
"tier": "blocked",
"label": "Blocked for auto-install",
"auto_install_policy": "block",
"auto_install_allowed": false,
"human_review_required": true,
"blocked": true,
"recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first."
},
"quality": {
"score": 67,
"label": "Promising"
},
"supply": {
"track": "Design and creative production",
"scenario": "Design and creative",
"maintenance": "1mo since push",
"risk": "Risky"
},
"alternative_skills": [],
"do_not_use_when": [
"teams that need a vendor-supported SLA",
"high-compliance environments without internal security review",
"No OpenAgentSkill engagement data yet",
"Audit risk risky exceeds max_risk=medium",
"High-risk permission hints: Secrets or environment access",
"Permission surface may require sandboxing",
"Potential broker, wallet, exchange, or real-money execution surface; sandbox and explicit approval are required",
"This skill may touch real-money trading, broker, wallet, or exchange operations; use only in a sandbox with explicit approval."
],
"agent_contract": {
"task_input": "Use suggest-sfx in an agent workflow",
"recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first.",
"install_policy": "block",
"minimum_review_before_use": [
"Trust: 73/100 Strong shortlist",
"Audit: 77/100 Risky",
"Safety: 45/100 Avoid automatic install",
"Review repository, license, install command, and permission surface before production use."
],
"expected_agent_output": {
"selected_skill": "hassancs91-suggest-sfx-ac094e2e (suggest-sfx)",
"install_command": "npx skills add hassancs91/claude-faceless-shorts-creator --skill suggest-sfx",
"risk_summary": "Risky; Blocked for auto-install; Review before production",
"verification_result": "Report the smallest successful task, files touched, warnings, and any missing setup."
}
},
"outcome_feedback": {
"endpoint": "https://www.openagentskill.com/api/agent/outcome",
"method": "POST",
"requires_resolve_event_id": true,
"event_id_source": "Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.",
"expected_outcomes": [
"success",
"failed",
"not_relevant",
"blocked_by_risk",
"setup_required"
],
"payload_template": {
"event_id": "<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>",
"skill_slug": "hassancs91-suggest-sfx-ac094e2e",
"task": "Use suggest-sfx in an agent workflow",
"agent": "codex",
"outcome": "success",
"install_used": true,
"risk_blocked": false,
"setup_required": false,
"task_success": true,
"output_quality": 4,
"error_type": null,
"human_review_required": false,
"workspace": "sandbox",
"time_to_useful_ms": 120000,
"notes": "Report the smallest successful task, setup friction, files touched, and risk notes."
}
},
"endpoints": {
"web": "https://www.openagentskill.com/skills/hassancs91-suggest-sfx-ac094e2e",
"api": "https://www.openagentskill.com/api/agent/skills/hassancs91-suggest-sfx-ac094e2e",
"audit": "https://www.openagentskill.com/skills/hassancs91-suggest-sfx-ac094e2e/audit",
"eval": "https://www.openagentskill.com/api/agent/evals?slug=hassancs91-suggest-sfx-ac094e2e&task=Use%20suggest-sfx%20in%20an%20agent%20workflow&max_risk=medium",
"resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20suggest-sfx%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
"receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20suggest-sfx%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
"install": "https://www.openagentskill.com/api/skills/hassancs91-suggest-sfx-ac094e2e/install",
"manifest": "https://www.openagentskill.com/api/registry/manifest/hassancs91-suggest-sfx-ac094e2e"
}
}Listing source
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used_in.Audit
77/100
Risky
Copies are not installs. Installation counts require a reported successful installation; they are not a blanket quality guarantee.