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Official agent skill

Web Renderer Test

by remotion-dev in remotion-dev/remotion

Add explicitly requested web renderer tests or update existing ones for implementation changes.

OfficialCustom licenceAuto-check passedTesting & QA

Install Web Renderer Test

skills CLI
$ npx skills add remotion-dev/remotion --skill web-renderer-test -a claude-code

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

GitHub CLI
$ gh skill install remotion-dev/remotion web-renderer-test --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/remotion-dev/remotion.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/web-renderer-test .claude/skills/web-renderer-test && 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
web-renderer-test
GitHub stars
62k
Token cost
~547 tokens
SKILL.md length
127 words
Files
1
Skills in repo
71
Repo updated
First seen
Licence
Custom licence

At a glance

Add explicitly requested web renderer tests or update existing ones for implementation changes.

  • Works in 5 steps: Add a new fixture in… → Important: Add the fixture to… → Add a new test in… → …
  • Testing & QA work in your project
  • SKILL.md covers Example and Adding a new test
  • Calls bunx

What it does

Web Renderer Test is an agent skill from remotion-dev/remotion, published by the product's own GitHub organization. Add explicitly requested web renderer tests or update existing ones for implementation changes.

Its SKILL.md is about 550 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Testing & QA. The repository describes itself as: 🎥 Make videos programmatically with React.

When your agent uses it

  • Testing & QA work in your project

Example prompts

  • “/web-renderer-test”

Workflow steps

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

  1. Add a new fixture in packages/web-renderer/src/test/fixtures.
  2. Important: Add the fixture to packages/web-renderer/src/test/Root.tsx to add a way to preview it.
  3. Add a new test in packages/web-renderer/src/test.
  4. Run bunx vitest src/test/video.test.tsx to execute the test.
  5. Important: Update packages/docs/docs/client-side-rendering/limitations.mdx to reflect the newly supported property.

What it can do on your machine

Read from SKILL.md and the folder at commit 1e4c5de. 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

    Shell commands in SKILL.md call:

    • bunx

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

  • Network

    No URLs in SKILL.md. Its commands use bunx, which can reach the network depending on how they are called.

    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

Web Renderer Test loads about 547 tokens when it runs. Until then it costs about 28 tokens; SKILL.md has 127 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~28
When it runs · the whole SKILL.md, loaded when a task matches
~547

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 127 words (~547 tokens).

“Use this skill to update existing web renderer tests when needed for implementation changes. Add new tests only when the user explicitly requests them.”

— opening of SKILL.md by remotion-dev, Custom licence
name
web-renderer-test

Read the full SKILL.md on GitHub

Files

Just SKILL.md in .agents/skills/web-renderer-test of remotion-dev/remotion.

Open the folder on GitHubat commit 1e4c5de

Compare with similar skills

Web Renderer Test 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.

Web Renderer Test compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Web Renderer Test this skillremotion-dev/remotion62k—~547Automated safety check: PassCustom licence
Web Application Testinganthropics/skills180k51 repos~966Automated safety check: PassApache-2.0
Diagnosing Bugsfossasia/eventyay-interpretation1.6k31 repos~2.1kAutomated safety check: PassApache-2.0
TDDfossasia/eventyay-interpretation1.6k28 repos~1.1kAutomated safety check: PassApache-2.0
TDD WorkflowhellangleZ/burn-in-cceverywhere-ralph11211 repos~2.4kAutomated safety check: PassNone
TDDsanity-io/sanity6.4k20 repos~1kAutomated safety check: PassMIT

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Categories

Questions about Web Renderer Test

What does Web Renderer Test do?

Add explicitly requested web renderer tests or update existing ones for implementation changes. Web Renderer Test is an agent skill from remotion-dev/remotion, published by the product's own GitHub organization. Add explicitly requested web renderer tests or update existing ones for implementation changes.

When should I use Web Renderer Test?

Web Renderer Test fits situations like: testing & QA work in your project.

How do I install Web Renderer Test in Claude Code?

Run `npx skills add remotion-dev/remotion --skill web-renderer-test -a claude-code`. Or copy the skill folder (.agents/skills/web-renderer-test in remotion-dev/remotion) into .claude/skills/web-renderer-test in your project. Claude Code loads it when a task matches its description.

How do I install Web Renderer Test in Codex?

Run `npx skills add remotion-dev/remotion --skill web-renderer-test -a codex`. Or copy the skill folder (.agents/skills/web-renderer-test in remotion-dev/remotion) into .agents/skills/web-renderer-test in your project. Codex loads it when a task matches its description.

Can I use Web Renderer Test 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 remotion-dev/remotion --skill web-renderer-test -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/web-renderer-test, .gemini/skills/web-renderer-test, .github/skills/web-renderer-test and .opencode/skills/web-renderer-test in your project.

What does Web Renderer Test need to run?

Going by SKILL.md and its folder, Web Renderer Test needs the command-line tools its instructions call (bunx).

Does Web Renderer Test 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 Web Renderer Test 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 Web Renderer Test use?

Web Renderer Test 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 Web Renderer Test use?

About 547 tokens (SKILL.md is roughly 2.2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Web Renderer Test?

Skills that share tags, products or a category with Web Renderer Test: Web Application Testing (anthropics/skills, 180k stars), Diagnosing Bugs (fossasia/eventyay-interpretation, 1.6k stars), TDD (fossasia/eventyay-interpretation, 1.6k stars) and TDD Workflow (hellangleZ/burn-in-cceverywhere-ralph, 112 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Web Renderer Test?

remotion-dev (a GitHub organization, an official publisher) maintains it in remotion-dev/remotion, which has 62,235 GitHub stars. The repository holds 71 skills in this directory. The repository was last updated on October 7, 2026.

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