How much data is required for this skill to be effective?

A minimum of 100 instances (such as errors or test failures) is recommended for high statistical confidence, though it can provide insights with as few as 50.

How is the confidence score calculated?

Confidence is determined by multiplying Data Quality (D), Accuracy/True Positive Rate (A), and Logical Correctness (L) to provide a decimal score between 0 and 1.

When should I avoid using Retrospective Validation?

Avoid using it when you have insufficient data, when you are measuring emergent human behavior changes, or when pattern matching is unreliable (over 20% false positives).

Can this skill prevent future errors?

Yes, by identifying patterns in historical errors, it helps you build and validate tools that can be deployed to prevent those specific types of errors in the future.

What is the primary benefit of Retrospective Validation?

It allows you to validate if a tool or methodology works by using past data (like logs or git history), saving 40-60% of the time usually spent waiting for live results.

Retrospective Validation

Name: Retrospective Validation
Author: yaleh

byyaleh

•

セキュリティとテスト

Validates methodology effectiveness and tool performance using historical data instead of live deployment cycles.

Retrospective Validation enables developers and teams to prove the effectiveness of new tools, linting rules, or error-prevention strategies by analyzing past failures and session history rather than waiting for future events. By applying a structured four-phase process—collection, pattern definition, execution, and confidence assessment—this skill provides statistical rigor for workflow optimizations. It is particularly effective for teams with 100+ historical data instances, offering a 40-60% reduction in validation time and a 60-80% cost reduction by bypassing the friction of CI/CD integration and long-term user studies.

主な機能

01Rigorous confidence calculation model based on data quality, accuracy, and logic.

0215 GitHub stars

03Quantifiable impact analysis including prevention rates and speedup metrics.

04Pattern matching heuristics for automated detection of preventable errors.

05Structured framework for analyzing historical CI logs, git history, and session data.

06Significant time reduction compared to prospective (live) validation methods.

ユースケース

01Testing a new error-recovery script against hundreds of historical crash logs to prove its ROI.

02Evaluating a workflow optimization rule before committing to costly CI/CD infrastructure changes.

03Performing a baseline quality assessment of a codebase using existing software session history.

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add yaleh/meta-cc retrospective-validation

For use in Claude.ai and ChatGPT

Download Skill