OpenAgentSkill
GitHub200+

Pre-install eval

ffmpeg Eval report.

A machine-readable install decision for agents: task fit, Trust Score, Audit Score, install safety, permission surface, and a concrete validation plan before this skill touches a workspace.

FailedHigh riskBLOCK Policy
75
Eval report
72
Trust
82
Audit
50
Agent safety

do not auto install

Permission surface: shell or command execution, filesystem or document access

Required gates

Checks an agent must pass before install

Open JSON

Task fit

84

pass

Task wording matches this skill metadata.

  • Evaluate ffmpeg before installing it in an agent workflow
  • design-creative
  • Multimodal media workflows; Claude Code teams; teams that value GitHub adoption signals

Install path

92

pass

Install handoff is available.

  • npx skills add calesthio/OpenMontage --skill ffmpeg

Install command safety

92

pass

standard package or runtime install path

  • npx skills add calesthio/OpenMontage --skill ffmpeg

Trust score

72

warn

Good trust signals with a few areas worth checking before rollout.

  • Strong shortlist
  • 56K GitHub stars
  • AGPL-3.0

Audit score

82

warn

Needs review

  • Permission surface may require sandboxing

Agent safety gate

50

warn

Sparse or mixed signals. Useful for discovery, but not for autonomous installation.

  • Test manually in an isolated workspace and compare against safer alternatives.
  • High-risk permission hints: Shell or command execution

License clarity

86

pass

AGPL-3.0

  • AGPL-3.0

Permission surface

48

fail

shell or command execution, filesystem or document access

  • Shell or command execution: high
  • Browser automation: medium
  • Network access: medium

Validation plan

What the agent should do next

  1. 1Inspect repository, README/SKILL.md, license, and recent commits before production use.
  2. 2Install in an isolated workspace or sandbox with no production secrets available.
  3. 3Run the smallest representative task and record files touched, commands run, network access, and outputs.
  4. 4Compare the selected skill against at least one alternative when the eval status is review or failed.
  5. 5Promote only after the agent reports a successful verification result and unresolved warnings are accepted.

Do not use when

Conditions that require another skill

  • teams that need a vendor-supported SLA
  • production agents without a repository review
  • SKILL.md does not include a prerequisites section stating that ffmpeg and ffprobe must be installed, so agents may fail with confusing 'command not found' errors.
  • High-risk permission hints: Shell or command execution
  • Permission surface may require sandboxing
  • No security guidance is provided about quoting/escaping user-controlled filenames or treating media inputs as untrusted, which is important when an LLM generates shell commands.

Supporting checks

Trust signals behind the decision

README/SKILL.md completeness

warn

76

Public metadata needs stronger README/SKILL.md context

Recent maintenance

pass

88

2mo since push

Alternatives available

pass

82

Alternative skills are available for comparison.