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Built for the Claude Code community with Claude Code by mertbuilds.com

Independent project, not affiliated with Anthropic
ed3dai avatar

Functional Core Imperative Shell

ed3dai/ed3d-plugins
163 installs247 stars
Summary

This skill helps you structure code by separating pure business logic from side effects. The core idea is simple: put your pure functions in one file where they're easy to test without mocks, and isolate all I/O operations in a thin shell around them. It's based on the functional core, imperative shell pattern that makes entire classes of bugs structurally impossible. The author suggests using it whenever you're writing new code, refactoring, or deciding where logic belongs. It's a disciplined approach that pays off in testability, though it requires thinking carefully about boundaries from the start.

Install to Claude Code

npx -y skills add ed3dai/ed3d-plugins --skill functional-core-imperative-shell --agent claude-code

Installs into .claude/skills of the current project.

CodeRabbit
CodeRabbit
AI writes the code. CodeRabbit catches the slop.
Try For Free →
Lid closed, agents working
Lid closed, agents working
Keeps your Mac awake while Claude Code, Codex or Cursor works. Lets it sleep when they are done.
Try free for 7 days →
Block distraction from your iPhone for freeBlock distraction from your iPhone for free
Block distraction from your iPhone for free
Block distracting apps from your iPhone permanently without a 3rd party app. Free and open source.
Block now (100% free) →
Granola, the best AI meeting recorder
Granola, the best AI meeting recorder
Notes, actions and memory. Without a meeting bot. First month 100% off.
Download for free →
belt - the only tool your agent needs
belt - the only tool your agent needs
belt cli automatically finds the best tools and skills for your agent. image, video, music, tts...
one prompt install →
Open Steps
Open Steps
Free an open-source skills that make AI coding agents easier to understand, verify, and control.
Download for free →
AppSignal
AppSignal
Monitor with ease. Code with confidence.
Start Free Trial →
Agent, connect blockchain
Agent, connect blockchain
Connect your Claude agent to live crypto prices and trading routes via 1inch
Get the MCP →
CodeRabbit
CodeRabbit
AI writes the code. CodeRabbit catches the slop.
Try For Free →
Lid closed, agents working
Lid closed, agents working
Keeps your Mac awake while Claude Code, Codex or Cursor works. Lets it sleep when they are done.
Try free for 7 days →
Block distraction from your iPhone for freeBlock distraction from your iPhone for free
Block distraction from your iPhone for free
Block distracting apps from your iPhone permanently without a 3rd party app. Free and open source.
Block now (100% free) →
Granola, the best AI meeting recorder
Granola, the best AI meeting recorder
Notes, actions and memory. Without a meeting bot. First month 100% off.
Download for free →
belt - the only tool your agent needs
belt - the only tool your agent needs
belt cli automatically finds the best tools and skills for your agent. image, video, music, tts...
one prompt install →
Open Steps
Open Steps
Free an open-source skills that make AI coding agents easier to understand, verify, and control.
Download for free →
AppSignal
AppSignal
Monitor with ease. Code with confidence.
Start Free Trial →
Agent, connect blockchain
Agent, connect blockchain
Connect your Claude agent to live crypto prices and trading routes via 1inch
Get the MCP →
Files
SKILL.md

Select a file.

Featured
CodeRabbit
CodeRabbit
AI writes the code. CodeRabbit catches the slop.
Try For Free →
Lid closed, agents working
Lid closed, agents working
Keeps your Mac awake while Claude Code, Codex or Cursor works. Lets it sleep when they are done.
Try free for 7 days →
Block distraction from your iPhone for freeBlock distraction from your iPhone for free
Block distraction from your iPhone for free
Block distracting apps from your iPhone permanently without a 3rd party app. Free and open source.
Block now (100% free) →
Granola, the best AI meeting recorder
Granola, the best AI meeting recorder
Notes, actions and memory. Without a meeting bot. First month 100% off.
Download for free →
belt - the only tool your agent needs
belt - the only tool your agent needs
belt cli automatically finds the best tools and skills for your agent. image, video, music, tts...
one prompt install →
Open Steps
Open Steps
Free an open-source skills that make AI coding agents easier to understand, verify, and control.
Download for free →
AppSignal
AppSignal
Monitor with ease. Code with confidence.
Start Free Trial →
Agent, connect blockchain
Agent, connect blockchain
Connect your Claude agent to live crypto prices and trading routes via 1inch
Get the MCP →
Categories
DocumentationCode Review & QualityCLI & Terminal
First SeenJun 3, 2026
View on GitHub

Recommended

More Documentation →
bbeierle12 avatar
shader-fundamentals

bbeierle12/skill-mcp-claude

GLSL shader fundamentals—vertex and fragment shaders, uniforms, varyings, attributes, coordinate systems, built-in variables, and data types. Use when writing custom shaders, understanding the graphics pipeline, or debugging shader code. The foundational skill for all shader work.
161
8
jwilger avatar
code-review

jwilger/agent-skills

Three-stage code review protocol covering spec compliance, code quality, and domain integrity. Use this skill whenever the user asks to review code, prepare or check a PR, assess implementation quality, verify code against a spec or acceptance criteria, or audit for security and domain modeling issues. Triggers on: "review this code", "review my PR", "check implementation against spec", "code quality audit", "does this match the requirements", "review for security issues", "check for primitive obsession", "monetary precision review", "review test coverage gaps". Also activates when the user wants structured PASS/FAIL verdicts per requirement, severity-rated findings, or a gated review that blocks on critical issues. NOT for: style/formatting linting, debugging runtime errors, writing new code, or automated CI checks.
161
1
s-hiraoku avatar
security-audit

s-hiraoku/synapse-a2a

General-purpose security auditing guide. Covers OWASP Top 10, dependency vulnerabilities, authentication, authorization, input validation, and secret management. Use this when performing a security review or audit.
161
10
aibtcdev avatar
aibtc-news-protocol

aibtcdev/skills

AIBTC Network editorial skill — "Protocol and Infrastructure Updates" signal composition, source validation, and editorial voice guide for aibtc.news correspondents covering API changes, contract deployments, MCP updates, protocol upgrades, bugs, and breaking changes.
160
9
laurigates avatar
git-commit-workflow

laurigates/claude-plugins

Conventional commit format, staging, and message conventions. Use when writing commit messages, staging files, grouping changes, or auto-detecting linked issues.
160
49
cinience avatar
alicloud-skill-creator-test

cinience/alicloud-skills

Smoke test for alicloud-skill-creator. Validate repository path conventions, frontmatter quality, script compilation, and README index refresh workflow.
157
396