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Agent skill

Okojo Engine Development

by akeit0 in akeit0/okojo

Develop or debug Okojo ECMAScript engine internals. An agent skill from akeit0/okojo.

MITAuto-check passedDevelopment

Install Okojo Engine Development

skills CLI
$ npx skills add akeit0/okojo --skill okojo-engine-development -a claude-code

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

GitHub CLI
$ gh skill install akeit0/okojo okojo-engine-development --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-engine-development .claude/skills/okojo-engine-development && 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
okojo-engine-development
GitHub stars
160
Token cost
~509 tokens
SKILL.md length
207 words
Files
1
Skills in repo
3
Repo updated
First seen
Licence
MIT

At a glance

Develop or debug Okojo ECMAScript engine internals. An agent skill from akeit0/okojo.

  • Built-in implementation work
  • SKILL.md covers Route only when needed and Minimal default
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Use the linked specialist skill only when its task matches

What it does

Okojo Engine Development is an agent skill from akeit0/okojo. Develop or debug Okojo ECMAScript engine internals. Use for parser, compiler, bytecode, VM, object-model, or built-in implementation work; use the linked specialist skill only when its task matches.

Its SKILL.md is about 510 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. It works with JavaScript, C# 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

  • Built-in implementation work
  • Use the linked specialist skill only when its task matches

Example prompts

  • “/okojo-engine-development”

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

    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

Okojo Engine Development loads about 509 tokens when it runs. Until then it costs about 56 tokens; SKILL.md has 207 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~56
When it runs · the whole SKILL.md, loaded when a task matches
~509

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). 207 words, ~509 tokens.

Download SKILL.mdSave it as .claude/skills/okojo-engine-development/SKILL.md (or your agent's skills folder).
name
okojo-engine-development
description
Develop or debug Okojo ECMAScript engine internals. Use for parser, compiler, bytecode, VM, object-model, or built-in implementation work; use the linked specialist skill only when its task matches.

Okojo Engine Development

Use this skill only for Okojo engine implementation or debugging. Read ../../../AGENTS.md for repository rules; this skill does not replace them.

Route only when needed

  • Language/compiler/VM investigation: use the V8 reference and read ../../../docs/performance/OKOJO_VM_DEEP_INSPECTION_METHOD.md when the task is non-trivial.
  • VM-loop optimization: also read ../../../docs/performance/OKOJO_VM_LOOP_OPTIMIZATION_FOUNDATION.md (workflow) and ../../../docs/performance/OKOJO_VM_DISPATCH_REDUCTION_PROPOSALS.md (active plan) only for that optimization work.
  • Test262 campaigns: use okojo-test262, not this workflow.
  • Okojo.Node/Ink debugging: use okojo-node-ink-debug, not this workflow.

API/package/namespace migration, documentation-only edits, and mechanical refactoring do not require this skill.

Minimal default

Inspect the relevant code and tests, make the smallest correct change, and follow the focused-test/full-suite workflow in AGENTS.md. Use V8 for language/compiler/VM behavior and Node for built-in behavior when a semantic reference is needed.

For compiler-only optimization experiments, compare the emitted Okojo bytecode/opcodes with the target first; do not inspect C# IL/JIT for a change that cannot affect them. Run the shortest representative benchmark only after the opcode artifact reaches a plausible target or the comparison is inconclusive. Use C# IL/JIT inspection only when the VM/runtime implementation changed and that native code can be affected; use longer benchmark runs only after the focused check warrants them.

Do not load the deep references or specialist skills unless the current task actually needs them.

© akeit0, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

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

Open the folder on GitHubat commit 478ec2d

Compare with similar skills

Okojo Engine Development 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 Engine Development compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Okojo Engine Development this skillakeit0/okojo160—~509Automated safety check: PassMIT
Git HooksProrise-cool/Claude-Code-Multi-Agent305—~3.6kAutomated safety check: NotesNone
Corvus Typescript Evaluatorcorvus-dotnet/Corvus.JsonSchema199—~1.3kAutomated safety check: PassApache-2.0
Use JS Interopdotnet/skills5.6k1 repos~2.7kAutomated safety check: PassMIT
Blazormanagedcode/dotnet-skills486—~2.1kAutomated safety check: PassMIT
Speckit ConstitutionWeihanLi/WeihanLi.Common24211 repos~2.1kAutomated safety check: PassApache-2.0

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  • Okojo Node Ink Debug

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Works with

Categories

Questions about Okojo Engine Development

What does Okojo Engine Development do?

Develop or debug Okojo ECMAScript engine internals. An agent skill from akeit0/okojo. Okojo Engine Development is an agent skill from akeit0/okojo. Develop or debug Okojo ECMAScript engine internals.

When should I use Okojo Engine Development?

Okojo Engine Development fits situations like: built-in implementation work; use the linked specialist skill only when its task matches.

How do I install Okojo Engine Development in Claude Code?

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

How do I install Okojo Engine Development in Codex?

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

Can I use Okojo Engine Development 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-engine-development -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-engine-development, .gemini/skills/okojo-engine-development, .github/skills/okojo-engine-development and .opencode/skills/okojo-engine-development in your project.

What does Okojo Engine Development need to run?

SKILL.md names no scripts, command-line tools or credentials: Okojo Engine Development is instructions for the agent only.

Does Okojo Engine Development 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 Engine Development 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 Engine Development use?

Okojo Engine Development 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 Engine Development use?

About 509 tokens (SKILL.md is roughly 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 Okojo Engine Development?

Skills that share tags, products or a category with Okojo Engine Development: Git Hooks (Prorise-cool/Claude-Code-Multi-Agent, 305 stars), Corvus Typescript Evaluator (corvus-dotnet/Corvus.JsonSchema, 199 stars), Use JS Interop (dotnet/skills, 5.6k stars) and Blazor (managedcode/dotnet-skills, 486 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Okojo Engine Development?

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.