Agent skill

Nushell

by ccusage in ccusage/ccusage

Guides ccusage Nushell scripts. An agent skill from ccusage/ccusage.

Custom licenceAuto-check passedDevOps & Cloud

Install Nushell

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

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

GitHub CLI
$ gh skill install ccusage/ccusage nushell --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/nushell .claude/skills/nushell && 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
nushell
GitHub stars
19k
Token cost
~938 tokens
SKILL.md length
467 words
Files
1
Skills in repo
17
Repo updated
First seen
Licence
Custom licence

At a glance

Guides ccusage Nushell scripts. An agent skill from ccusage/ccusage.

  • Validating .nu files under .github/scripts
  • SKILL.md covers Runtime Shape, Docs, Style and Validation
  • Calls just
  • Apps/ccusage/scripts

What it does

Nushell is an agent skill from ccusage/ccusage. Guides ccusage Nushell scripts. Use when adding, editing, formatting, or validating .nu files under .github/scripts, apps/ccusage/scripts, or scripts, including their Nix shebangs and GitHub Actions callers.

Its SKILL.md is about 940 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 DevOps & Cloud, covering CI/CD. It works with GitHub and GitHub Actions.

When your agent uses it

  • Validating .nu files under .github/scripts
  • Apps/ccusage/scripts
  • Including their Nix shebangs and GitHub Actions callers

Example prompts

  • “Use the nushell skill to guide ccusage Nushell scripts. An agent skill from ccusage/ccusage”
  • “/nushell”

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

    Shell commands in SKILL.md call:

    • just

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

  • Network

    Links to these hosts (documentation or services it may open):

    • nushell.sh

    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

Nushell loads about 938 tokens when it runs. Until then it costs about 54 tokens; SKILL.md has 467 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~54
When it runs · the whole SKILL.md, loaded when a task matches
~938

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 467 words (~938 tokens).

“Nushell is a functional, structured-data language that happens to be a shell. Write it that way: pipelines of transformations over records and tables, not bash with different syntax. Root AGENTS.md says when to pick Nushell over Babashka, Rust, or TypeScript.”

— opening of SKILL.md by ccusage, Custom licence
name
nushell
paths
**/*.nu
globs
*.nu

Read the full SKILL.md on GitHub

Files

Just SKILL.md in .agents/skills/nushell of ccusage/ccusage.

Open the folder on GitHubat commit d2fd844

Compare with similar skills

Nushell 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.

Nushell compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Nushell this skillccusage/ccusage19k—~938Automated safety check: PassCustom licence
AI News RadarLearnPrompt/ai-news-radar1.8k—~2.5kAutomated safety check: NotesMIT
Make GitHub Actions Workflowdotnet/efcore15k—~1.7kAutomated safety check: PassMIT
ONNX Runtime CI Managementmicrosoft/onnxruntime22k—~4.1kAutomated safety check: PassMIT
CI Watchdoglatitude-dev/latitude-llm4.7k—~1.6kAutomated safety check: PassMIT
Use Vercel Actionamondnet/vercel-action765—~2.7kAutomated safety check: PassMIT

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    1.8k GitHub stars~2.5k tokensUpdated today
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  • Official

    Create GitHub Actions workflows for CI, automation, or PR management.

    15k GitHub stars~1.7k tokensUpdated today
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    Official

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  • CI Watchdog

    latitude-dev/latitude-llm

    Continuously monitor GitHub PR CI checks and automatically fix failures until all checks pass.

    4.7k GitHub stars~1.6k tokensUpdated yesterday
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  • Release

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More from ccusage/ccusage

All 17 skills in this repo
  • Rust Binary Size

    ccusage/ccusage

    Guides Rust binary size reduction for ccusage. An agent skill from ccusage/ccusage.

    19k GitHub stars~591 tokensUpdated today
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  • Skill Creator

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    Guides repo-local skill creation and updates. An agent skill from ccusage/ccusage.

    19k GitHub stars~1.1k tokensUpdated today
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  • TDD

    ccusage/ccusage

    Guides t-wada Red-Green-Refactor TDD for ccusage logic changes.

    19k GitHub stars~665 tokensUpdated today
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  • Commit

    ccusage/ccusage

    Creates atomic Conventional Commits. An agent skill from ccusage/ccusage.

    19k GitHub stars~722 tokensUpdated today
    Auto-check passed
  • Create PR

    ccusage/ccusage

    Runs the full PR lifecycle. An agent skill from ccusage/ccusage.

    19k GitHub stars~646 tokensUpdated today
    Auto-check passed
  • Cmux Debug

    ccusage/ccusage

    Verifies ccusage terminal output in a real cmux pane. An agent skill from ccusage/ccusage.

    19k GitHub stars~466 tokensUpdated today
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Categories

Questions about Nushell

What does Nushell do?

Guides ccusage Nushell scripts. An agent skill from ccusage/ccusage. Nushell is an agent skill from ccusage/ccusage. Guides ccusage Nushell scripts.

When should I use Nushell?

Nushell fits situations like: validating .nu files under .github/scripts; apps/ccusage/scripts; including their Nix shebangs and GitHub Actions callers.

How do I install Nushell in Claude Code?

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

How do I install Nushell in Codex?

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

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

What does Nushell need to run?

Going by SKILL.md and its folder, Nushell needs the command-line tools its instructions call (just).

Does Nushell access the network?

SKILL.md names 1 domain. As links in the text: nushell.sh. This is read from the text; nothing was executed.

Is Nushell 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 Nushell use?

Nushell 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 Nushell use?

About 938 tokens (SKILL.md is roughly 3.8k 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 Nushell?

Skills that share tags, products or a category with Nushell: AI News Radar (LearnPrompt/ai-news-radar, 1.8k stars), Make GitHub Actions Workflow (dotnet/efcore, 15k stars), ONNX Runtime CI Management (microsoft/onnxruntime, 22k stars) and CI Watchdog (latitude-dev/latitude-llm, 4.7k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Nushell?

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.