How does this skill help with legacy code?

It helps map out complex, undocumented relationships in legacy systems by forcing a systematic trace of what a component uses (upstream) and what uses that component (downstream).

What does 'Blast Radius' mean in this context?

Blast Radius refers to the maximum extent of the system that could be affected by a specific change, helping developers determine if a change is small, medium, or system-wide.

What is the 150% Impact Rule?

The 150% Impact Rule requires a 100% understanding of the core change being made, plus a 50% enhancement focused on clear visibility of all external dependencies and downstream effects.

When should I trigger the Impact Map 150 skill?

You should trigger this skill before making significant changes to code, when debugging to understand cause-and-effect chains, or when performing risk assessments for refactoring.

Impact Map 150

Name: Impact Map 150
Author: MykhailoDmytriakha

byMykhailoDmytriakha

Productivity & Workflow

Analyzes and maps the ripple effects of code changes to identify dependencies, risks, and total system impact.

About

Impact Map 150 is a strategic analysis tool for Claude Code that helps developers visualize the "blast radius" of any modification before a single line of code is committed. By systematically mapping upstream dependencies and downstream effects, it prevents unexpected regressions and ensures complete system awareness. The skill follows a rigorous protocol to define the core change while providing a clear view of how changes propagate through the entire ecosystem, making it an essential utility for planning features, refactoring legacy systems, and performing high-stakes risk assessments.

Key Features

Blast Radius estimation to identify high-risk system modifications
Systematic boundary definition to isolate unaffected code areas
Trigger-based analysis for planning, refactoring, and complex debugging
Standardized impact reports categorized by critical, affected, and monitoring zones
0 GitHub stars
Bi-directional mapping of upstream dependencies and downstream effects

Use Cases

Pre-deployment risk assessment for major architectural refactors
Debugging unexpected regressions by tracing cause-and-effect chains
Planning new features that must integrate with sensitive legacy components

About

Key Features

Blast Radius estimation to identify high-risk system modifications
Systematic boundary definition to isolate unaffected code areas
Trigger-based analysis for planning, refactoring, and complex debugging
Standardized impact reports categorized by critical, affected, and monitoring zones
0 GitHub stars
Bi-directional mapping of upstream dependencies and downstream effects

Use Cases

Pre-deployment risk assessment for major architectural refactors
Debugging unexpected regressions by tracing cause-and-effect chains
Planning new features that must integrate with sensitive legacy components