Agent skill

Okojo Test262

Run and continue Okojo Test262 compliance work. An agent skill from akeit0/okojo.

MITAuto-check passedDevelopment

Install Okojo Test262

skills CLI

$ npx skills add akeit0/okojo --skill okojo-test262 -a claude-code

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

GitHub CLI

$ gh skill install akeit0/okojo okojo-test262 --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/akeit0/okojo.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/okojo-test262 .claude/skills/okojo-test262 && 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/

Paste into Claude Code

Install the "okojo-test262" agent skill from https://github.com/akeit0/okojo/tree/main/.agents/skills/okojo-test262 into .claude/skills/okojo-test262/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "okojo-test262", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/akeit0/okojo/tree/main/.agents/skills/okojo-test262

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add akeit0/okojo --skill okojo-test262 -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install akeit0/okojo okojo-test262 --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/akeit0/okojo.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/okojo-test262 .agents/skills/okojo-test262 && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "okojo-test262" agent skill from https://github.com/akeit0/okojo/tree/main/.agents/skills/okojo-test262 into .agents/skills/okojo-test262/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "okojo-test262", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add akeit0/okojo --skill okojo-test262 -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install akeit0/okojo okojo-test262 --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/akeit0/okojo.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/okojo-test262 .cursor/skills/okojo-test262 && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "okojo-test262" agent skill from https://github.com/akeit0/okojo/tree/main/.agents/skills/okojo-test262 into .cursor/skills/okojo-test262/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "okojo-test262", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/akeit0/okojo.git --path .agents/skills/okojo-test262

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add akeit0/okojo --skill okojo-test262 -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install akeit0/okojo okojo-test262 --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/akeit0/okojo.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/okojo-test262 .gemini/skills/okojo-test262 && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "okojo-test262" agent skill from https://github.com/akeit0/okojo/tree/main/.agents/skills/okojo-test262 into .gemini/skills/okojo-test262/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "okojo-test262", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install akeit0/okojo okojo-test262

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add akeit0/okojo --skill okojo-test262 -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/akeit0/okojo.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/okojo-test262 .github/skills/okojo-test262 && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "okojo-test262" agent skill from https://github.com/akeit0/okojo/tree/main/.agents/skills/okojo-test262 into .github/skills/okojo-test262/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "okojo-test262", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add akeit0/okojo --skill okojo-test262 -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install akeit0/okojo okojo-test262 --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/akeit0/okojo.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/okojo-test262 .opencode/skills/okojo-test262 && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "okojo-test262" agent skill from https://github.com/akeit0/okojo/tree/main/.agents/skills/okojo-test262 into .opencode/skills/okojo-test262/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "okojo-test262", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: okojo-test262
GitHub stars: 160
Token cost: ~742 tokens
SKILL.md length: 254 words
Files: 1
Skills in repo: 3
Repo updated: Sep 21, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Run and continue Okojo Test262 compliance work. An agent skill from akeit0/okojo.

Works in 7 steps: reproduce the exact Test262 case → classify it as engine/compiler/runtime… → compare V8 for language/compiler/VM… → …
Ordinary Okojo implementation
SKILL.md covers Core policy, Workflow, Focused engine loop and Test262 runner, plus 1 more section
Calls dotnet

What it does

Okojo Test262 is an agent skill from akeit0/okojo. Run and continue Okojo Test262 compliance work. Use only when the request involves Test262, Test262Runner, compliance sweeps, failing Test262 cases, the passed cache, or SkipList. Do not use for ordinary Okojo implementation, refactoring, review, or debugging.

Its SKILL.md is about 740 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 Development, covering Refactoring. It works with C#, JavaScript and .NET. The repository describes itself as: Okojo is an experimental low allocation managed JavaScript engine for .NET. The licence is MIT.

When your agent uses it

Ordinary Okojo implementation
Tasks that involve Refactoring

Example prompts

“/okojo-test262”

Workflow steps

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

reproduce the exact Test262 case
classify it as engine/compiler/runtime behavior or intentionally unsupported coverage
compare V8 for language/compiler/VM behavior or Node for built-in/runtime behavior
implement the narrow root-cause fix
add a focused regression under tests/Okojo.Tests
rebuild the runner before trusting an exact rerun
rerun the exact case, nearby coverage, and the requested continuation batch

What it can do on your machine

Read from SKILL.md and the folder at commit 478ec2d. 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:
- dotnet
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

Okojo Test262 loads about 742 tokens when it runs. Until then it costs about 69 tokens; SKILL.md has 254 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~69
When it runs · the whole SKILL.md, loaded when a task matches: ~742

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

The full file from akeit0/okojo at commit 478ec2d, republished under its MIT licence (© akeit0). 254 words, ~742 tokens.

Download SKILL.mdSave it as .claude/skills/okojo-test262/SKILL.md (or your agent's skills folder).

name: okojo-test262
description: Run and continue Okojo Test262 compliance work. Use only when the request involves Test262, Test262Runner, compliance sweeps, failing Test262 cases, the passed cache, or SkipList. Do not use for ordinary Okojo implementation, refactoring, review, or debugging.

Okojo Test262

Use this skill only for Test262-driven work in tools/Test262Runner and the engine/test files needed to resolve a selected Test262 failure. Ordinary engine work belongs to the general Okojo development workflow.

Core policy

Fix standards-aligned behavior.

Do not prioritize deprecated/legacy behavior unless explicitly re-approved. Treat these as intentionally unsupported by default:

direct-eval-specific semantics
with
legacy __proto__
deprecated legacy accessor APIs
Function.prototype.arguments / Function.prototype.caller
arguments.callee

For these, prefer narrow intended Test262 skips with a clear reason over regressing core paths.

Do not add a skip merely to make a run green. A skip requires an intentionally unsupported feature or an explicit user decision.

Workflow

reproduce the exact Test262 case
classify it as engine/compiler/runtime behavior or intentionally unsupported coverage
compare V8 for language/compiler/VM behavior or Node for built-in/runtime behavior
implement the narrow root-cause fix
add a focused regression under tests/Okojo.Tests
rebuild the runner before trusting an exact rerun
rerun the exact case, nearby coverage, and the requested continuation batch

Focused engine loop

powershell

dotnet build tests/Okojo.Tests/Okojo.Tests.csproj -c Release /p:UseSharedCompilation=false
dotnet test tests/Okojo.Tests/Okojo.Tests.csproj -c Release --no-build --filter <Name>

When the runner is involved:

powershell

dotnet build tools/Test262Runner/Test262Runner.csproj -c Release /p:UseSharedCompilation=false

Test262 runner

Show help:

powershell

dotnet run --project tools/Test262Runner/Test262Runner.csproj -c Release -- --help

Common continuation pattern:

powershell

dotnet run --project tools/Test262Runner/Test262Runner.csproj -c Release -- --max-tests 30 --full-path --skip-passed

Array.prototype sweep example:

powershell

dotnet run --project tools/Test262Runner/Test262Runner.csproj -c Release -- --max-tests 30 --category built-ins --filter Array/prototype --full-path --skip-passed

Useful runner notes:

--skip-passed uses the local passed cache
rebuild the runner after runtime/compiler changes before trusting exact reruns
SkipList.cs contains intentional exclusions
do not run a broad sweep when an exact or category-filtered rerun answers the current question

Editing guidance

Prefer minimal, local fixes.
Add a focused regression test for each fix.
Do not revert unrelated user changes.
Do not widen policy support accidentally just to satisfy a single Test262 file.

Files

Just SKILL.md in .agents/skills/okojo-test262 of akeit0/okojo.

Open the folder on GitHubat commit 478ec2d

Compare with similar skills

Okojo Test262 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.

Okojo Test262 compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Okojo Test262 this skillakeit0/okojo	160	—	~742	Automated safety check: Pass	MIT	17 days ago
Add Refactoringdotnet/roslynator	3.5k	—	~946	Automated safety check: Pass	Custom licence	4 days ago
Dynamo Dotnet ExpertDynamoDS/Dynamo	2k	—	~922	Automated safety check: Pass	Apache-2.0	today
Deprecate Analyzer Or Refactoringdotnet/roslynator	3.5k	—	~511	Automated safety check: Pass	Custom licence	4 days ago
Dotnet10 Featuresrunceel/ReactiveProperty	944	—	~2.7k	Automated safety check: Pass	MIT	1 mo ago
Git HooksProrise-cool/Claude-Code-Multi-Agent	305	—	~3.6k	Automated safety check: Notes	None	22 days ago

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Questions about Okojo Test262

What does Okojo Test262 do?

Run and continue Okojo Test262 compliance work. An agent skill from akeit0/okojo. Okojo Test262 is an agent skill from akeit0/okojo. Run and continue Okojo Test262 compliance work.

When should I use Okojo Test262?

Okojo Test262 fits situations like: ordinary Okojo implementation; tasks that involve Refactoring.

How do I install Okojo Test262 in Claude Code?

Run `npx skills add akeit0/okojo --skill okojo-test262 -a claude-code`. Or copy the skill folder (.agents/skills/okojo-test262 in akeit0/okojo) into .claude/skills/okojo-test262 in your project. Claude Code loads it when a task matches its description.

How do I install Okojo Test262 in Codex?

Run `npx skills add akeit0/okojo --skill okojo-test262 -a codex`. Or copy the skill folder (.agents/skills/okojo-test262 in akeit0/okojo) into .agents/skills/okojo-test262 in your project. Codex loads it when a task matches its description.

Can I use Okojo Test262 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 akeit0/okojo --skill okojo-test262 -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/okojo-test262, .gemini/skills/okojo-test262, .github/skills/okojo-test262 and .opencode/skills/okojo-test262 in your project.

What does Okojo Test262 need to run?

Going by SKILL.md and its folder, Okojo Test262 needs the command-line tools its instructions call (dotnet).

Does Okojo Test262 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 Okojo Test262 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 Okojo Test262 use?

Okojo Test262 is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Okojo Test262 use?

About 742 tokens (SKILL.md is roughly 3k 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 Okojo Test262?

Skills that share tags, products or a category with Okojo Test262: Add Refactoring (dotnet/roslynator, 3.5k stars), Dynamo Dotnet Expert (DynamoDS/Dynamo, 2k stars), Deprecate Analyzer Or Refactoring (dotnet/roslynator, 3.5k stars) and Dotnet10 Features (runceel/ReactiveProperty, 944 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Okojo Test262?

akeit0 (a GitHub user) maintains it in akeit0/okojo, which has 160 GitHub stars. The repository holds 3 skills in this directory. The repository was last updated on September 21, 2026.

Source: akeit0/okojo on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Okojo Test262

Install Okojo Test262

Facts

At a glance

What it does

When your agent uses it

Example prompts

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Okojo Test262

Core policy

Workflow

Focused engine loop

Test262 runner

Editing guidance

Files

Compare with similar skills

Similar skills

Add Refactoring

Dynamo Dotnet Expert

Deprecate Analyzer Or Refactoring

Dotnet10 Features

Git Hooks

Refactor Analysis

More from akeit0/okojo

Okojo Node Ink Debug

Okojo Engine Development

Questions about Okojo Test262

Install Okojo Test262

Facts

At a glance

What it does

When your agent uses it

Example prompts

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Okojo Test262

Core policy

Workflow

Focused engine loop

Test262 runner

Editing guidance

Files

Compare with similar skills

Similar skills

More from akeit0/okojo

Related

Questions about Okojo Test262