Agent skill

Development

by ccusage in ccusage/ccusage

Guides ccusage monorepo development. An agent skill from ccusage/ccusage.

Custom licenceAuto-check passedDevelopment

Install Development

skills CLI
$ npx skills add ccusage/ccusage --skill development -a claude-code

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

GitHub CLI
$ gh skill install ccusage/ccusage 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/ccusage/ccusage.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/development .claude/skills/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
development
GitHub stars
19k
Token cost
~433 tokens
SKILL.md length
178 words
Files
2 (incl. references)
Skills in repo
17
Repo updated
First seen
Licence
Custom licence

At a glance

Guides ccusage monorepo development. An agent skill from ccusage/ccusage.

  • Editing workspace packages
  • SKILL.md covers The npm Packaging Seam and Gotchas
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • The npm launcher

What it does

Development is an agent skill from ccusage/ccusage. Guides ccusage monorepo development. Use when editing workspace packages, the npm launcher or native packaging, dependencies, or shared configuration, and when running the just build, typecheck, test, format, or check recipes.

Its SKILL.md is about 430 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/commands.md`).

It sits in Development, covering Monorepo tooling. It works with npm.

When your agent uses it

  • Editing workspace packages
  • The npm launcher
  • Native packaging
  • Shared configuration

Example prompts

  • “Use the development skill to guide ccusage monorepo development. An agent skill from ccusage/ccusage”
  • “/development”

What it can do on your machine

Read from SKILL.md and the folder at commit d2fd844. 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

Development loads about 433 tokens when it runs, and up to ~806 if it reads all its reference files. Until then it costs about 60 tokens; SKILL.md has 178 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~60
When it runs · the whole SKILL.md, loaded when a task matches
~433
With references · SKILL.md plus every file in references/, read only if the agent opens them
~806

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 178 words (~433 tokens).

“Root AGENTS.md holds the repository shape and the standing policies. This skill is about working in the tree: the npm packaging seam, the recipes, and validation.”

— opening of SKILL.md by ccusage, Custom licence
name
development

Read the full SKILL.md on GitHub

Files

SKILL.md and 1 other file (references) in .agents/skills/development of ccusage/ccusage.

  • SKILL.md
  • references/commands.md

Open the folder on GitHubat commit d2fd844

Compare with similar skills

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.

Development compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Development this skillccusage/ccusage19k—~433Automated safety check: PassCustom licence
Nx Run Tasksnomcopter/react-mosaic4.8k7 repos~613Automated safety check: PassCustom licence
Migrate Internal Package into GhostTryGhost/Ghost55k—~3.8kAutomated safety check: PassMIT
Cutting A ReleaseTriliumNext/Trilium38k—~3.2kAutomated safety check: PassAGPL-3.0
Link Workspace Packagesnomcopter/react-mosaic4.8k5 repos~760Automated safety check: PassCustom licence
Building And VerifyingNangoHQ/nango13k—~902Automated safety check: PassCustom licence

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Works with

Categories

Questions about Development

What does Development do?

Guides ccusage monorepo development. An agent skill from ccusage/ccusage. Development is an agent skill from ccusage/ccusage. Guides ccusage monorepo development.

When should I use Development?

Development fits situations like: editing workspace packages; the npm launcher; native packaging; shared configuration.

How do I install Development in Claude Code?

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

How do I install Development in Codex?

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

Can I use 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 ccusage/ccusage --skill 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/development, .gemini/skills/development, .github/skills/development and .opencode/skills/development in your project.

What does Development need to run?

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

Does 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 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 Development use?

Development 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 Development use?

About 433 tokens (SKILL.md is roughly 1.7k 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 373 tokens, read only when the agent opens those files.

What are the alternatives to Development?

Skills that share tags, products or a category with Development: Nx Run Tasks (nomcopter/react-mosaic, 4.8k stars), Migrate Internal Package into Ghost (TryGhost/Ghost, 55k stars), Cutting A Release (TriliumNext/Trilium, 38k stars) and Link Workspace Packages (nomcopter/react-mosaic, 4.8k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Development?

ccusage (a GitHub organization) maintains it in ccusage/ccusage, which has 18,901 GitHub stars. The repository holds 17 skills in this directory. The repository was last updated on October 7, 2026.

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