map-reduce

Execute map and reduce phases to aggregate batch processing results.

60|2|Updated Jan 21, 2026
One-click install
npx skills add https://github.com/ElliotJLT/Claude-Skill-Potions --skill map-reduce
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: map-reduce
Source: https://github.com/ElliotJLT/Claude-Skill-Potions/tree/main/skills/map-reduce
Command: npx skills add https://github.com/ElliotJLT/Claude-Skill-Potions --skill map-reduce

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill provides a structured pattern for processing large collections of items by splitting work into a Map phase and then reducing results, enabling scalable batch operations.

Core Features & Use Cases

  • Map Phase: Split work into items and apply a per-item operation in parallel.
  • Reduce Phase: Aggregate per-item results into a final summary or report.
  • Use Case: Analyze an entire codebase to compute per-file statistics (lines, functions, complexity) and produce a codebase report.

Quick Start

Define a Map-Reduce Job: map-reduce job name. Input: specify the collection of items. Map function: the per-item operation. Reduce function: the aggregation/summary operation. Then execute to obtain the final results.

Frequently Asked Questions about map-reduce

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I process large datasets across multiple items in parallel?▼

Map-reduce splits batch processing into two phases: a map phase applies an operation to each item in parallel, then a reduce phase aggregates results into a final summary. This pattern scales codebase-wide analyses, bulk transformations, and large-scale data processing tasks efficiently.

Can I use map-reduce to analyze an entire codebase and generate statistics?▼

Yes. Map-reduce orchestrates codebase analysis by mapping per-file operations—counting lines, functions, complexity—across all files in parallel, then reducing those results into a unified codebase report with aggregated metrics.

What do I need to define before executing a map-reduce job?▼

Define four elements: a job name, the input collection of items, a map function specifying the per-item operation, and a reduce function that aggregates results. Execute the job to obtain final processed results.

When should I use map-reduce instead of sequential batch processing?▼

Map-reduce is suited for large-scale data processing where splitting work into independent per-item operations and then aggregating results improves performance. It handles automation and parallel processing across many items more effectively than sequential approaches.

What aggregation strategy should my reduce function implement?▼

Your reduce function should combine per-item results into a final summary matching your analysis goal. For codebase statistics, aggregate counts and metrics; for bulk transformations, consolidate outputs. The strategy depends on your end-state reporting or data needs.