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Agent skill

Create Spf Behavior

by videojs in videojs/video.js

Create or extract one SPF playback-engine behavior. An agent skill from videojs/video.js.

Custom licenceAuto-check passed

Install Create Spf Behavior

skills CLI
$ npx skills add videojs/video.js --skill create-spf-behavior -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install videojs/video.js create-spf-behavior --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/videojs/video.js.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/create-spf-behavior .claude/skills/create-spf-behavior && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
create-spf-behavior
GitHub stars
40k
Token cost
~389 tokens
SKILL.md length
179 words
Files
2 (incl. references)
Skills in repo
38
Repo updated
First seen
Licence
Custom licence

At a glance

Create or extract one SPF playback-engine behavior. An agent skill from videojs/video.js.

  • Works in 4 steps: Define one-sentence purpose, inputs,… → Confirm the responsibility is… → Add focused failing tests, implement the… → …
  • A new atomic responsibility with signals
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Create Spf Behavior is an agent skill from videojs/video.js. Create or extract one SPF playback-engine behavior. Use for a new atomic responsibility with signals, lifecycle, cleanup, composition, and tests.

Its SKILL.md is about 390 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/workflow.md`).

The repository describes itself as: Video.js v10 - open source media player framework for HTML and React.

When your agent uses it

  • A new atomic responsibility with signals

Example prompts

  • “/create-spf-behavior”

Workflow steps

4 steps, taken from the first numbered list in SKILL.md.

  1. Define one-sentence purpose, inputs, writes, lifecycle, cleanup, ordering, and source-reset rules.
  2. Confirm the responsibility is independently testable and does not hide coordination with another behavior.
  3. Add focused failing tests, implement the smallest behavior, and wire it at the owning composition layer.
  4. Verify slot ownership, naming, cleanup, boundaries, and final test coverage.

What it can do on your machine

Read from SKILL.md and the folder at commit 74cf8cd. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Create Spf Behavior loads about 389 tokens when it runs, and up to ~2.6k if it reads all its reference files. Until then it costs about 41 tokens; SKILL.md has 179 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~41
When it runs · the whole SKILL.md, loaded when a task matches
~389
With references · SKILL.md plus every file in references/, read only if the agent opens them
~2.6k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 179 words (~389 tokens).

“Read references/workflow.md completely before acting; it contains the detailed SPF creation workflow and failure checks.”

— opening of SKILL.md by videojs, Custom licence
name
create-spf-behavior

Read the full SKILL.md on GitHub

Files

SKILL.md and 1 other file (references) in .agents/skills/create-spf-behavior of videojs/video.js.

  • SKILL.md
  • references/workflow.md

Open the folder on GitHubat commit 74cf8cd

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders. This page covers the copy in videojs/video.js, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Create Spf Behavior next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Create Spf Behavior compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Create Spf Behavior this skillvideojs/video.js40k—~389Automated safety check: PassCustom licence
Extractalirezarezvani/claude-skills28k—~1.4kAutomated safety check: PassMIT
Brand Extractnexu-io/open-design100k—~3.1kAutomated safety check: PassApache-2.0
Design Extractnexu-io/open-design100k—~549Automated safety check: PassApache-2.0
Kg Extractruvnet/ruflo74k—~751Automated safety check: NotesMIT
Browser Extractruvnet/ruflo74k1 repos~888Automated safety check: NotesMIT

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More from videojs/video.js

All 38 skills in this repo

  • Commit PR

    videojs/video.js

    Commit, push, and create or update a Video.js pull request. An agent skill from videojs/video.js.

    40k GitHub stars~445 tokensUpdated today
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  • Maintain Tests

    videojs/video.js

    Gate and audit test value. An agent skill from videojs/video.js.

    40k GitHub stars~2.2k tokensUpdated today
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  • Write API Reference

    videojs/video.js

    Write generated Video.js API reference pages. An agent skill from videojs/video.js.

    40k GitHub stars~804 tokensUpdated today
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  • Write Docs

    videojs/video.js

    Write Video.js guides, concepts, READMEs, and JSDoc. An agent skill from videojs/video.js.

    40k GitHub stars~741 tokensUpdated today
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  • Write Locale Translations

    videojs/video.js

    Translate or audit the values in a Video.js locale pack. An agent skill from videojs/video.js.

    40k GitHub stars~723 tokensUpdated today
    Auto-check passed

  • Change Spf Behavior

    videojs/video.js

    Change SPF playback-engine behaviors. An agent skill from videojs/video.js.

    40k GitHub stars~451 tokensUpdated today
    Auto-check passed

Questions about Create Spf Behavior

What does Create Spf Behavior do?

Create or extract one SPF playback-engine behavior. An agent skill from videojs/video.js. js. Create or extract one SPF playback-engine behavior.

When should I use Create Spf Behavior?

Create Spf Behavior fits situations like: A new atomic responsibility with signals.

How do I install Create Spf Behavior in Claude Code?

Run `npx skills add videojs/video.js --skill create-spf-behavior -a claude-code`. Or copy the skill folder (.agents/skills/create-spf-behavior in videojs/video.js) into .claude/skills/create-spf-behavior in your project. Claude Code loads it when a task matches its description.

How do I install Create Spf Behavior in Codex?

Run `npx skills add videojs/video.js --skill create-spf-behavior -a codex`. Or copy the skill folder (.agents/skills/create-spf-behavior in videojs/video.js) into .agents/skills/create-spf-behavior in your project. Codex loads it when a task matches its description.

Can I use Create Spf Behavior in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add videojs/video.js --skill create-spf-behavior -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/create-spf-behavior, .gemini/skills/create-spf-behavior, .github/skills/create-spf-behavior and .opencode/skills/create-spf-behavior in your project.

What does Create Spf Behavior need to run?

SKILL.md names no scripts, command-line tools or credentials: Create Spf Behavior is instructions for the agent only.

Does Create Spf Behavior access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Create Spf Behavior safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Create Spf Behavior use?

Create Spf Behavior has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does Create Spf Behavior use?

About 389 tokens (SKILL.md is roughly 1.6k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 2.2k tokens, read only when the agent opens those files.

What are the alternatives to Create Spf Behavior?

Skills that share tags, products or a category with Create Spf Behavior: Extract (alirezarezvani/claude-skills, 28k stars), Brand Extract (nexu-io/open-design, 100k stars), Design Extract (nexu-io/open-design, 100k stars) and Kg Extract (ruvnet/ruflo, 74k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Create Spf Behavior?

videojs (a GitHub organization) maintains it in videojs/video.js, which has 39,909 GitHub stars. The repository holds 38 skills in this directory. The repository was last updated on October 8, 2026.

Source: videojs/video.js on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.