Development

OrganizationPopular

ccusage

development

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.

Overview

Publisher	ccusage
Repository	`ccusage`
Skill name	`development`
Stars	19K
Forks	871
Bundled files	1
Links	Skill source Repository Homepage

Markdown instructions
A SKILL.md file the model loads on demand, so it only costs tokens when a request actually matches.
Works with any LLM
AI skills are plain Markdown, not provider-specific code, so this works with GPT, Claude, Gemini, Grok, or a local model.
1 bundled files
Scripts, templates, and references the model can read while it works. Files are read-only and never executed.
Open source
Published by ccusage on GitHub. Read the source before you install it.

Installation

Install the Development AI skill in TypingMind to use it with any LLM, or drop it into another agent that reads SKILL.md.

Install in TypingMind

TypingMind installs a skill straight from its GitHub folder — it reads SKILL.md, bundles the resource files, and stores the result locally.

Open the app and go to Plugins → Skills.
Choose "Install from GitHub".
Paste the skill folder URL below and confirm.
https://github.com/ccusage/ccusage/tree/main/.agents/skills/development
Enable the skill in any chat where you want it available.

Plugins → Skills → Add skill → From GitHub URL, then paste the folder URL and press Continue.

Install in another agent

Any agent that reads the Agent Skills format can use this skill — copy the folder into that agent's skills directory.

Claude Code — .claude/skills

git clone --depth 1 https://github.com/ccusage/ccusage.git /tmp/ccusage
mkdir -p .claude/skills
cp -r /tmp/ccusage/.agents/skills/development .claude/skills/development

Restart Claude Code after copying so it picks up the new skill.

Use it in TypingMind

Enable Development in any TypingMind chat and the model takes it from there. Its name and description sit in the system prompt, and the moment a request matches, the model loads the full instructions itself — you never invoke it by hand, and it costs no tokens until it is actually used.

The model loads Development on its own as soon as a request matches it.

Works with any AI model

AI skills are plain Markdown instructions rather than provider-specific code, so Development is not tied to the model it was written for. Install it once in TypingMind and use it with GPT-5, Claude, Gemini, Grok, DeepSeek, Mistral, Llama, or a local model you run yourself — all on your own API keys.

Loaded only when it is needed
The system prompt carries just the name and description. The instructions are fetched on the first matching request, so an idle skill costs nothing.
Switch models mid-chat
Because the skill is instructions rather than code, changing model does not break it — the next model reads the same SKILL.md.

Skill instructions

This is the SKILL.md content the model loads. Read it before installing — a skill is instructions your model will follow.

ccusage Development

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.

The npm Packaging Seam

apps/ccusage is the npm shell around the Rust binary — package metadata, config-schema.json, and the packaging and benchmark scripts. Its src/cli.js launcher resolves the platform binary from the matching @ccusage/ccusage-<platform>-<arch> optional dependency and spawns it; those packages live in packages/ccusage-<platform>-<arch> and ship nothing but bin/ccusage.

The Nushell scripts in apps/ccusage/scripts/ own the binary side and share native-binary.nu: ensure-native-binary.nu puts a usable, portable binary in place for a local build, stage-native-package.nu fills one platform package, and verify-native-package.nu runs from each platform package's prepack. A packaging change usually touches the launcher and those scripts together.

Gotchas

.claude/skills is generated from .agents/skills by nix/agent-skills.nix. Edit the source tree; leave the generated one uncommitted.
LOG_LEVEL gates runtime noise (rust/crates/ccusage-core/src/logger.rs): 0 suppresses progress and box titles, >= 4 logs pricing refresh detail. Use LOG_LEVEL=0 whenever output is captured or compared.

references/commands.md covers just, where a new dependency or tool belongs, validation, and releases.

Bundled files

The model reads these on demand while the skill is loaded. They are exposed as readable files and are never executed.

references/commands.md1 KB

Frequently asked questions

What does the Development AI skill do?

Why use Development on TypingMind?

Because you install it once and use it with any model. Development is plain Markdown rather than provider-specific code, so the same skill runs on GPT-5, Claude, Gemini, Grok, or a local model — and you can switch model mid-chat without it breaking. TypingMind runs on your own API keys, so you pay providers directly instead of a per-seat subscription, and your skills and chats stay in your own storage.

How do I install Development in TypingMind?

Open Plugins → Skills → Install from GitHub in TypingMind and paste https://github.com/ccusage/ccusage/tree/main/.agents/skills/development. TypingMind reads its SKILL.md and bundles its files and installs it as a skill you can enable per chat.

Which AI models can use Development?

Any model you connect in TypingMind. AI skills are plain Markdown instructions rather than provider-specific code, so GPT, Claude, Gemini, Grok, and local models can all load this skill when a request matches it.

How many AI models can I use with Development?

As many as you like. As long as a model supports skills, you can use Development with it — GPT, Claude, Gemini, Grok, DeepSeek, Mistral, Llama and more — all on TypingMind with your own API keys.

Is the Development AI skill free?

It is published on GitHub by ccusage. Check the repository for licensing terms. You only pay your own AI provider for the tokens you use.

What are AI skills?

An AI skill is a reusable instruction bundle that teaches an AI model how to do one specific task. It follows the open Agent Skills format: a SKILL.md file with a name and description, plus any scripts, templates or reference files the model may need. The model reads the instructions only when your request matches the skill, so an installed skill costs nothing until it is used.

How are AI skills different from plugins or MCP servers?

A plugin or MCP server gives a model new tools to call — code that runs somewhere and returns a result. An AI skill gives the model knowledge and process instead: how to approach a task, which steps to follow, what good output looks like. Skills are plain Markdown, so they need no server, no API key and no runtime, and they work with any model.

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Overview

Installation

Install in TypingMind

Install in another agent

Use it in TypingMind

Works with any AI model

Skill instructions

ccusage Development

The npm Packaging Seam

Gotchas

Bundled files

Frequently asked questions

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