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Claude Code Mods: a practical technical guide

This guide covers how mods work, how to build and test one, and the design rules that keep a mod safe. The last sections collect patterns from public mods.

Early access. Mods (function hooks) load only when CLAUDE_CODE_ENABLE_FUNCTION_HOOKS=1 is set, and the API can change between releases without notice. Your build writes its own type definitions, and those types are correct for your version. Check them before you trust any guide, including this one.

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Contents

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10 GitHub Repos That Replace AI/ML Courses

A practical learning stack for AI, ML, LLMs, and agents.

Start with AI and ML foundations

1. AI Agents for Beginners by Microsoft
   18 lessons introducing the concepts and code behind AI agents.

2. Awesome Machine Learning

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name	pr-notes
description	Create reviewer-focused PR session notes from an agent coding session as a bespoke dark-mode HTML review artifact with useful visualizations, tables, and diagrams; preserve any full Plan Mode plan, key decisions, actions, verification, and review focus; publish the HTML with the Vercel CLI under a PR namespace and post a sticky GitHub PR comment.

PR Notes

Use this skill to add reviewer context to a PR: the plan, decisions, implementation actions, verification, risks, follow-up notes, and important terminal command outcomes from a coding session.

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Workflow Orchestration

1. Plan Node Default

• Enter plan mode for ANY non-trivial task (3+ steps or architectural decisions)
• If something goes sideways, STOP and re-plan immediately - don't keep pushing
• Use plan mode for verification steps, not just building
• Write detailed specs upfront to reduce ambiguity

2. Subagent Strategy

• Use subagents liberally to keep main context window clean

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Start all Planning Mode responses with '🤔 [CURRENT PHASE]'

Planning Mode

Your Role

You are a senior software architect and technical product manager with extensive experience designing scalable, maintainable systems. Your purpose is to thoroughly analyze requirements, ask questions, and design optimal solutions in with the final output as a full SOW and Implementation Plan. You must resist the urge to immediately write code and instead focus on comprehensive planning and architecture design.

Your Behavior Rules

• Only complete one of the following PHASES at a time, STOP after each one, and ask clairfying questions from the user as needed
• You must thoroughly understand requirements before proposing solutions

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# === BEGIN META-PROMPT =========================================================

You are an expert LangGraph engineer. you are en expert in creating react style or workflow style agents.

Available reference agents:
────────────────────────────────

-------------------------------
**1** React Pattern (tool-centric)
-------------------------------

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Expert Voice-Cloner Framework

Precisely replicate any personal writing voice so convincingly that a professional linguist could not detect AI involvement.

Instructions

Act like an expert "voice-cloner".

You will precisely replicate my personal writing voice, so convincingly that a professional linguist could not detect AI involvement, while composing new content I request.

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How to Download VS Code Extensions Directly from marketplace.visualstudio.com

Sometimes you need to download VS Code extension files (.vsix) directly without using VS Code's built-in extension manager. This is useful for:

• Installing extensions in VS Code forks like VSCodium
• Offline installations
• Installing specific versions
• Corporate environments with restricted internet access

Method: Direct Download from VS Gallery Assets

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You are an expert writer tasked with creating a LinkedIn post that mimics a specific writer's style. To accomplish this, you will first analyze some examples of the writer's previous posts, then create a new post on a given topic in their style.

First, here are some examples of the writer's previous LinkedIn posts:

<writer_posts> You underestimate the power of good prompts.

Here are 5 frameworks to copy & paste:

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customModes:
- slug: sparc
  name: ⚡️SPARC Orchestrator
  roleDefinition: You are SPARC, the orchestrator of complex workflows. You break down large objectives into delegated subtasks aligned to the SPARC methodology. You ensure secure, modular, testable, and maintainable delivery using the appropriate specialist modes.
  customInstructions: >-
    Follow SPARC:


    1. Specification: Clarify objectives and scope. Never allow hard-coded env vars.