essentials

Claude Code Plugin Marketplace

A personal plugin marketplace for Claude Code featuring essential tools for deep investigation, systematic code review, documentation lookup, and code maintenance.

Quick Start

/plugin marketplace add krmcbride/claude-plugins
/plugin marketplace list krmcbride
/plugin install essentials@krmcbride
# Restart Claude Code to activate

Available Plugins

Essentials

Essential tooling for discovering docs, cleaning up code, deep thinking (ultraplan), and systematic code review.

Features:

UltraPlan - Deep Investigation Methodology

Systematic multi-step investigation of complex problems with confidence-based progression.

/ultraplan I need help designing a better architecture for...

What it does:

• Progressive confidence tracking (exploring → low → medium → high → certain)
• Multi-step investigation with state accumulation
• Iterative Haiku agent guidance for next-step suggestions
• Final Sonnet agent validation for comprehensive analysis
• Practical engineering focus with trade-off analysis
• Implementation options with pros/cons (similar to Claude Code plan mode)

CodeReview - Systematic Code Analysis

Multi-step code review with severity-classified findings and actionable fixes.

/codereview src/auth.py src/middleware.py

What it does:

• Progressive confidence tracking (exploring → low → medium → high → certain)
• Severity classification for all issues (🔴 CRITICAL, 🟠 HIGH, 🟡 MEDIUM, 🟢 LOW)
• Multi-step investigation with state accumulation
• Iterative Haiku agent guidance for coverage validation
• Final Sonnet agent validation for independent review
• Actionable fixes with before/after code examples
• Top 3 priorities with effort estimates
• Quick wins vs. long-term improvements

Focus areas:

• Security vulnerabilities (SQL injection, XSS, hardcoded secrets, auth gaps)
• Concurrency issues (race conditions, deadlocks, thread-safety)
• Resource management (memory leaks, unclosed connections)
• Error handling gaps
• Performance bottlenecks (algorithmic complexity, N+1 queries)
• Code quality and maintainability

Best for:

• Security audits before production
• Bug investigation and root cause analysis
• Performance bottleneck identification
• Code quality assessment
• Pre-deployment validation

Documentation Lookup Skill

Fetches library documentation via Context7's HTTP API using the "code execution" pattern.

What it does:

• Proactively activates when you mention libraries or frameworks
• Writes curl commands to fetch documentation from Context7 API
• Two-step process: search for library ID, then fetch docs
• Falls back to web search if needed
• Use: "Check the docs for..."

Why code execution? Instead of always loading MCP tool definitions into context, Claude writes API calls only when needed—reducing context usage and demonstrating the pattern from Anthropic's code execution blog post.

Code Examples Skill

Find real-world code examples across millions of GitHub repositories using grep.app.

What it does:

• Finds how others implement specific patterns in production code
• Filters by language, repository, or file path
• Use: "How do others implement X?" or "Show me usage examples for..."

Complements documentation-lookup: While documentation-lookup fetches official docs, code-examples finds real-world usage in production code.

Code Janitor Agent

Mechanical code maintenance specialist for tedious cleanup work.

What it does:

• Fixes linting errors systematically
• Renames variables consistently across files
• Updates import statements
• Fixes formatting issues
• Iterates until all fixable issues are resolved

Consensus - Multi-Perspective Decision Analysis

Analyze complex decisions from multiple viewpoints using specialized debate agents.

/consensus Should we migrate to microservices?

What it does:

• Launches three parallel Sonnet agents with distinct analytical stances:
  • FOR - Advocates for the proposal with optimistic perspective
  • AGAINST - Critiques the proposal rigorously
  • NEUTRAL - Provides objective analysis weighing evidence
• Presents balanced view of trade-offs and considerations
• Helps avoid confirmation bias in decision-making

Plugin Development

This marketplace follows the Claude Code plugin specification.

Structure:

.claude-plugin/
  marketplace.json       # Marketplace manifest

essentials/
  .claude-plugin/
    plugin.json          # Plugin manifest
  commands/              # Custom slash commands
  agents/                # Specialized subagents
  skills/                # Proactive capabilities
  .mcp.json             # MCP server configurations

Requirements