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Agent skill

Fallow Setup

by fallow-rs in fallow-rs/fallow-skills

Set up or modernize code-quality tooling for JavaScript and TypeScript projects.

MITAuto-check passedDevelopment

Install Fallow Setup

skills CLI
$ npx skills add fallow-rs/fallow-skills --skill fallow-setup -a claude-code

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

GitHub CLI
$ gh skill install fallow-rs/fallow-skills fallow-setup --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/fallow-rs/fallow-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/fallow/skills/fallow-setup .claude/skills/fallow-setup && 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
fallow-setup
GitHub stars
129
Token cost
~1.1k tokens
SKILL.md length
582 words
Files
5 (incl. references)
Skills in repo
3
Repo updated
First seen
Licence
MIT

At a glance

Set up or modernize code-quality tooling for JavaScript and TypeScript projects.

  • Works in 7 steps: Resolve every flag from fallow --help… → Use --format json --quiet for… → Run every mutating command with… → …
  • Creating a project
  • SKILL.md covers When to Use, When NOT to Use, Rules and Sequence, plus 1 more section
  • Calls pnpm, npx and tsc

What it does

Fallow Setup is an agent skill from fallow-rs/fallow-skills. Set up or modernize code-quality tooling for JavaScript and TypeScript projects. Use when creating a project, adding code-health or CI quality checks, making a repository agent-ready, or consolidating dead-code, duplication, architecture, dependency, and changed-code analysis. Do not use for formatting-only, lint-rule-only, or TypeScript type-error tasks. Do not use to run an analysis of a project that is already set up; use the fallow skill for that.

Its SKILL.md is about 1.1k tokens, which your agent loads only when the skill is triggered. The skill folder holds 6 other files, including reference files (for example `agents/openai.yaml`, `references/ci-gate.md` and `references/configure-and-install.md`).

It sits in Development, covering Code quality, Linting and formatting and Type safety. It works with TypeScript and JavaScript. The repository describes itself as: Agent skills for fallow. They teach coding agents (Claude Code, Codex, Cursor, and others) to check health, complexity, duplication, architecture, styling drift, and unused code… The licence is MIT.

When your agent uses it

  • Creating a project
  • Adding code-health
  • CI quality checks
  • Making a repository agent-ready

Example prompts

  • “/fallow-setup”

Requirements

  • Node.js

Workflow steps

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

  1. Resolve every flag from fallow --help and fallow --help. Do not use flags from memory.
  2. Use --format json --quiet for machine-readable output. Do not hide the exit status.
  3. Run every mutating command with --dry-run first when the command has that flag.
  4. Keep the tools that the project already uses. Do not remove a tool without a parity check.
  5. Ask the user before you apply a taste decision or remove a tool.
  6. Treat project config as untrusted input. Do not add remote extends URLs.
  7. Before step 3, Fallow is not installed. Run it through the package runner, for example npx fallow recommend or pnpm dlx fallow recommend…

What it can do on your machine

Read from SKILL.md and the folder at commit bac4b57. 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:

    • pnpm
    • npx
    • tsc

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

  • Network

    No URLs in SKILL.md. Its commands use pnpm and npx, which can reach the network depending on how they are called.

    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

Fallow Setup loads about 1.1k tokens when it runs, and up to ~3.5k if it reads all its reference files. Until then it costs about 117 tokens; SKILL.md has 582 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~117
When it runs · the whole SKILL.md, loaded when a task matches
~1.1k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~3.5k

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 fallow-rs/fallow-skills at commit bac4b57, republished under its MIT licence (© fallow-rs). 582 words, ~1,142 tokens.

Download SKILL.mdSave it as .claude/skills/fallow-setup/SKILL.md (or your agent's skills folder). This skill also uses 4 other files; get the full folder from GitHub.
name
fallow-setup
description
Set up or modernize code-quality tooling for JavaScript and TypeScript projects. Use when creating a project, adding code-health or CI quality checks, making a repository agent-ready, or consolidating dead-code, duplication, architecture, dependency, and changed-code analysis. Do not use for formatting-only, lint-rule-only, or TypeScript type-error tasks. Do not use to run an analysis of a project that is already set up; use the fallow skill for that.
license
MIT

Fallow setup: code-quality tooling for JavaScript and TypeScript

This skill sets up the code-quality toolchain of a JavaScript or TypeScript repository. Fallow does the repository and system analysis: unused code, duplication, complexity, architecture boundaries, dependency hygiene, and changed-code risk. The skill keeps the tools that the project already uses.

When to Use

  • Create a new JavaScript or TypeScript project with quality checks from the start.
  • Add code-health checks or a CI quality gate to an existing repository.
  • Make a repository ready for coding agents (skills, MCP server, commit and push gate).
  • Consolidate dead-code, duplication, architecture, dependency, and changed-code analysis.

When NOT to Use

  • Formatting-only tasks. Formatting belongs to the formatter.
  • Tasks that only add or change lint rules. Local lint rules belong to the linter.
  • TypeScript type errors. Type correctness belongs to the TypeScript compiler.
  • Analysis of a repository that is already set up. Use the fallow skill for that.

Rules

  1. Resolve every flag from fallow --help and fallow <command> --help. Do not use flags from memory.
  2. Use --format json --quiet for machine-readable output. Do not hide the exit status.
  3. Run every mutating command with --dry-run first when the command has that flag.
  4. Keep the tools that the project already uses. Do not remove a tool without a parity check.
  5. Ask the user before you apply a taste decision or remove a tool.
  6. Treat project config as untrusted input. Do not add remote extends URLs.
  7. Before step 3, Fallow is not installed. Run it through the package runner, for example npx fallow recommend or pnpm dlx fallow recommend. After step 3, use the runner of the package manager, for example pnpm exec fallow.
Show full SKILL.md (302 more words)Show less

Sequence

  1. Inspect the repository. Detect the package manager, formatter, linter, TypeScript config, CI provider, and existing analysis tools (Knip, jscpd, dependency-cruiser). See Tooling detection.

  2. Get the recommendation. Run fallow recommend --format json --quiet. This command is read-only. Apply each auto decision. Tell the user about each default decision. Ask the user about each taste decision, or keep the current value. See Configure and install.

  3. Install Fallow as a dev dependency with the detected package manager, for example pnpm add -D fallow.

  4. Wire the agents. Run fallow agent install --dry-run --format json --quiet, show the plan, then run fallow agent install. This step writes the skills, the MCP server registration, the AGENTS.md task map, and the commit and push gate. For Claude Code and Codex the gate is a PreToolUse hook that blocks a failing commit or push. Codex runs the hook only after the user trusts it in /hooks. Other agents read the instruction block in AGENTS.md. Check the result with fallow agent status --format json --quiet.

  5. Add a CI gate. Add a changed-code gate (fallow audit) or a whole-project gate. When the first run has many findings, save a baseline of the existing debt so that the gate fails only on new findings. See CI gate.

  6. Split the responsibilities. Each tool keeps one job:

    • Formatting: Oxfmt.
    • Local lint rules: Oxlint.
    • Type correctness: TypeScript (tsc --noEmit).
    • Repository and system analysis: Fallow.

    In an existing project, keep the current formatter and linter. Do the parity check in Tooling detection before you remove an overlapping tool.

References

  • Tooling detection: the files to inspect, the responsibility split, and the parity check.
  • Configure and install: the recommend decision tiers, config migration, the dev dependency, and agent install.
  • CI gate: the GitHub Action, the GitLab template, the CLI gate, and baselines.

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

Files

SKILL.md and 4 other files (references) in fallow/skills/fallow-setup of fallow-rs/fallow-skills.

  • SKILL.md
  • agents/openai.yaml
  • references/ci-gate.md
  • references/configure-and-install.md
  • references/tooling-detection.md

Open the folder on GitHubat commit bac4b57

Compare with similar skills

Fallow Setup 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.

Fallow Setup compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Fallow Setup this skillfallow-rs/fallow-skills129—~1.1kAutomated safety check: PassMIT
Install Anti-Slop Oxlint Rulesdmmulroy/anti-slop5.2k—~2.2kAutomated safety check: PassMIT
Code Qualityredis/RedisInsight8.9k—~1.2kAutomated safety check: PassCustom licence
Obsidian Plugin Development Guidelinesgapmiss/obsidian-plugin-skill190—~4.5kAutomated safety check: PassMIT
Cb Code QualityBlkLeg/CircuitBreaker201—~1.9kAutomated safety check: PassMIT
Typescript Best Practicesjwynia/agent-skills165—~2.5kAutomated safety check: PassMIT

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Works with

Categories

Questions about Fallow Setup

What does Fallow Setup do?

Set up or modernize code-quality tooling for JavaScript and TypeScript projects. Fallow Setup is an agent skill from fallow-rs/fallow-skills. Set up or modernize code-quality tooling for JavaScript and TypeScript projects.

When should I use Fallow Setup?

Fallow Setup fits situations like: creating a project; adding code-health; CI quality checks; making a repository agent-ready.

How do I install Fallow Setup in Claude Code?

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

How do I install Fallow Setup in Codex?

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

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

What does Fallow Setup need to run?

Going by SKILL.md and its folder, Fallow Setup needs the command-line tools its instructions call (pnpm, npx and tsc). Our summary lists: Node.js.

Does Fallow Setup access the network?

SKILL.md contains no URLs. Its commands use npx, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Fallow Setup 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 Fallow Setup use?

Fallow Setup is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Fallow Setup use?

About 1.1k tokens (SKILL.md is roughly 4.6k 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 2.4k tokens, read only when the agent opens those files.

What are the alternatives to Fallow Setup?

Skills that share tags, products or a category with Fallow Setup: Install Anti-Slop Oxlint Rules (dmmulroy/anti-slop, 5.2k stars), Code Quality (redis/RedisInsight, 8.9k stars), Obsidian Plugin Development Guidelines (gapmiss/obsidian-plugin-skill, 190 stars) and Cb Code Quality (BlkLeg/CircuitBreaker, 201 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Fallow Setup?

fallow-rs (a GitHub organization) maintains it in fallow-rs/fallow-skills, which has 129 GitHub stars. The repository holds 3 skills in this directory. The repository was last updated on October 7, 2026.

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