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ffmpeg

Video and audio processing with FFmpeg. Use for format conversion, resizing, compression, audio extraction, and preparing assets for Remotion. Triggers include converting GIF to MP4, resizing video, extracting audio, compressing files, or any media transformation task.

68

Quality

82%

Does it follow best practices?

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SecuritybySnyk

Passed

No findings from the security scan

SKILL.md
Quality
Evals
Security

Quality

Content

65%

Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.

The content is highly actionable with comprehensive executable commands, but it carries explanatory prose Claude already knows and keeps everything inline rather than splitting large sections into reference files. Batch workflows also lack inline validation checkpoints.

Suggestions

Trim introductory/obvious commentary (e.g. "FFmpeg is the essential tool", "YouTube re-encodes everything") and the Feedback & Contributions section to reduce tokens on concepts Claude already knows.

Add inline validation checkpoints to batch and destructive workflows — e.g. after batch GIF conversion or concatenation, run an ffprobe validity check before proceeding, rather than only documenting error handling separately.

Move the large Platform-Specific Output Optimization and Remotion-Specific Patterns sections into reference files under references/ and signal them from the main body, so SKILL.md stays a lean overview.

DimensionReasoningScore

Conciseness

The body is mostly efficient command reference, but includes commentary Claude already knows ("FFmpeg is the essential tool", "YouTube re-encodes everything, so upload high quality", "CRF 23 is default, lower = better quality") and an off-topic Feedback & Contributions section that could be trimmed.

2 / 3

Actionability

It provides extensive copy-paste-ready, fully executable ffmpeg/ffprobe commands with specific flags, batch loops, and a complete export-all-platforms.sh script — matching the anchor for concrete, executable guidance.

3 / 3

Workflow Clarity

Validation tooling exists in a separate Error Handling section, but batch and destructive operations (concatenate, batch GIF conversion, batch platform export) lack inline validate-then-proceed checkpoints, so per the feedback-loops note workflow clarity is capped at 2.

2 / 3

Progressive Disclosure

The skill is a ~430-line monolithic SKILL.md with no bundle files; large self-contained sections (platform-specific output optimization, Remotion patterns) that could be split into reference files are instead inline, though sections are clearly organized.

2 / 3

Total

9

/

12

Passed

Description

100%

Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.

The description is strong: it names concrete actions, provides natural trigger terms, and explicitly covers both what the skill does and when to use it. No significant weaknesses to address.

DimensionReasoningScore

Specificity

The description lists multiple concrete actions — "format conversion, resizing, compression, audio extraction, and preparing assets for Remotion" — matching the anchor that rewards several specific named actions rather than a vague domain.

3 / 3

Completeness

It explicitly answers both what ("Video and audio processing with FFmpeg" plus specific actions) and when ("Use for..." and "Triggers include..."), with explicit trigger guidance rather than implied timing.

3 / 3

Trigger Term Quality

Phrases like "converting GIF to MP4, resizing video, extracting audio, compressing files, or any media transformation task" are natural terms a user would actually say, giving good coverage of common variations.

3 / 3

Distinctiveness Conflict Risk

FFmpeg is a specific named tool with a clear niche, and "preparing assets for Remotion" further narrows it, making it unlikely to trigger for the wrong skill.

3 / 3

Total

12

/

12

Passed

Validation

100%

Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.

Validation16 / 16 Passed

Validation for skill structure

No warnings or errors.

Repository
calesthio/OpenMontage
Reviewed

Table of Contents

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