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Agent skill

Effect Development

by foldkit in foldkit/foldkit

Effect development guidance. An agent skill from foldkit/foldkit.

MITAuto-check passed

Install Effect Development

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

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

GitHub CLI
$ gh skill install foldkit/foldkit effect-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/foldkit/foldkit.git skills-src && mkdir -p .claude/skills && cp -r skills-src/repos/effect/.agents/skills/effect-development .claude/skills/effect-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
effect-development
GitHub stars
912
Token cost
~181 tokens
SKILL.md length
84 words
Files
1
Skills in repo
17
Repo updated
First seen
Licence
MIT

At a glance

Effect development guidance. An agent skill from foldkit/foldkit.

  • Works in 3 steps: Identify the Effect APIs and concepts… → Search LLMS.md and ai-docs/src for those… → Apply the relevant guidance and inspect…
  • Reviewing code that composes Effect APIs
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Effect Development is an agent skill from foldkit/foldkit. Effect development guidance. Use when implementing or reviewing code that composes Effect APIs or patterns.

Its SKILL.md is about 180 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

The licence is MIT.

When your agent uses it

  • Reviewing code that composes Effect APIs

Example prompts

  • “/effect-development”

Workflow steps

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

  1. Identify the Effect APIs and concepts involved in the change.
  2. Search LLMS.md and ai-docs/src for those names and concepts, then read
  3. Apply the relevant guidance and inspect nearby source and tests for any

What it can do on your machine

Read from SKILL.md and the folder at commit ffbbde1. 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

Effect Development loads about 181 tokens when it runs. Until then it costs about 32 tokens; SKILL.md has 84 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~32
When it runs · the whole SKILL.md, loaded when a task matches
~181

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 foldkit/foldkit at commit ffbbde1, republished under its MIT licence (© foldkit). 84 words, ~181 tokens.

Download SKILL.mdSave it as .claude/skills/effect-development/SKILL.md (or your agent's skills folder).
name
effect-development
description
Effect development guidance. Use when implementing or reviewing code that composes Effect APIs or patterns.

Use the repository's AI documentation as targeted reference, not ambient context:

  1. Identify the Effect APIs and concepts involved in the change.
  2. Search LLMS.md and ai-docs/src for those names and concepts, then read the matching sections and examples.
  3. Apply the relevant guidance and inspect nearby source and tests for any repository-internal conventions not covered by the documentation.

The task is ready for implementation when every material Effect API or pattern has matching local guidance, or the search has established that none exists.

© foldkit, 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 repos/effect/.agents/skills/effect-development of foldkit/foldkit.

Open the folder on GitHubat commit ffbbde1

Compare with similar skills

Effect 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.

Effect Development compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Effect Development this skillfoldkit/foldkit912—~181Automated safety check: PassMIT
Effectshobcoder/shob5775 repos~694Automated safety check: PassMIT
Effectdxos/dxos525—~1.3kAutomated safety check: PassCustom licence
Effectusenotra/notra2551 repos~1.8kAutomated safety check: PassMIT
Effectstandardnguyen/rolandcode1061 repos~192Automated safety check: PassMIT
Add Effectremotion-dev/remotion62k—~2.8kAutomated safety check: PassCustom licence

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Questions about Effect Development

What does Effect Development do?

Effect development guidance. An agent skill from foldkit/foldkit. Effect Development is an agent skill from foldkit/foldkit. Effect development guidance.

When should I use Effect Development?

Effect Development fits situations like: reviewing code that composes Effect APIs.

How do I install Effect Development in Claude Code?

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

How do I install Effect Development in Codex?

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

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

What does Effect Development need to run?

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

Does Effect 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 Effect 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 Effect Development use?

Effect 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 Effect Development use?

About 181 tokens (SKILL.md is roughly 724 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 Effect Development?

Skills that share tags, products or a category with Effect Development: Effect (shobcoder/shob, 577 stars), Effect (dxos/dxos, 525 stars), Effect (usenotra/notra, 255 stars) and Effect (standardnguyen/rolandcode, 106 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Effect Development?

foldkit (a GitHub organization) maintains it in foldkit/foldkit, which has 912 GitHub stars. The repository holds 17 skills in this directory. The repository was last updated on October 7, 2026.

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