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safe-video-concat-workflow

Two-pass video concatenation workflow that avoids encoder compatibility issues by separating concat and audio mixing

57

Quality

64%

Does it follow best practices?

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Adds up to 20 points to the overall score

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SecuritybySnyk

Passed

No findings from the security scan

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tessl review fix ./benchmarks/gdpval/skills/safe-video-concat-workflow/SKILL.md
SKILL.md
Quality
Evals
Security

Quality

Content

76%Weight 40%Scale 1-5

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

The body is actionable and well-structured with executable ffmpeg commands, but lacks validation/verification checkpoints for a batch concat operation, which caps workflow clarity. Conciseness and progressive disclosure are solid with only minor tightening possible.

Suggestions

Add an explicit validation step between passes, e.g. verify interim.mp4 exists, has expected duration, and plays before running pass 2 (ffprobe the interim file).

Add a final verification step that probes final_output.mp4 to confirm duration roughly equals the sum of inputs and that an audio stream is present.

Trim the 'Why Two Passes?' section or fold its bullet points into a single line, since the two-pass rationale is already implied by the step structure.

DimensionReasoningScore

Conciseness

Largely efficient with command examples and brief comments, though the 'Why Two Passes?' section and a few explanatory lines slightly restate what the steps already show and could be trimmed.

4 / 5

Actionability

Provides concrete, copy-paste-ready ffprobe and ffmpeg commands covering probing, stream copy, concat, and audio mixing — fully executable across the common cases.

5 / 5

Workflow Clarity

Steps are clearly sequenced into a two-pass workflow, but this is a batch operation (concatenating multiple clips) with no validation checkpoint verifying the interim output before pass 2 or confirming the final file — per guideline this caps workflow clarity at 3.

3 / 5

Progressive Disclosure

Well-organized into clearly labeled sections (When to Use, Steps, Quick Reference) with no unnecessary external references; a single self-contained SKILL.md with minor room for tighter organization.

4 / 5

Total

16

/

20

Passed

Description

53%Weight 40%Scale 1-5

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 conveys a clear, specific purpose but omits explicit 'when to use' trigger guidance and lacks the natural keyword variations users would actually say. It is distinguishable but would benefit from a 'Use when...' clause and broader trigger terms.

Suggestions

Add an explicit trigger clause, e.g. 'Use when creating video showreels or compilations, combining multiple clips, or adding background music to concatenated videos.'

Broaden trigger terms to include natural phrases like 'merge videos', 'combine clips', 'showreel', and file extensions such as .mp4 to improve recall.

Mention key capabilities (probe sources, stream copy, audio mixing) in the description to lift specificity toward comprehensive coverage.

DimensionReasoningScore

Specificity

Names the domain (video concatenation) and 1-2 concrete actions (two-pass, separating concat and audio mixing), but coverage is not comprehensive — no mention of probing, stream copy, or format handling in the description itself.

3 / 5

Completeness

Provides a clear 'what' (two-pass concat workflow avoiding encoder issues) but lacks any 'when'/'Use when' trigger clause; per guideline a missing trigger clause caps completeness at 3.

3 / 5

Trigger Term Quality

Includes relevant terms like 'video concatenation' and 'audio mixing', but misses common natural variations users would say such as 'merge videos', 'combine clips', 'showreel', or file extensions like .mp4.

3 / 5

Distinctiveness Conflict Risk

The two-pass concat-specific niche is fairly distinct from generic video skills, with only minor overlap risk against general ffmpeg or editing skills.

4 / 5

Total

13

/

20

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
HKUDS/OpenSpace
Reviewed

Table of Contents

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