Incremental Implementation

This is the discipline that prevents you from writing 500 lines across eight files and then spending two hours debugging which change broke everything. It forces you to build in thin vertical slices: implement the smallest complete piece, run the tests, verify it works, commit it, then move to the next slice. The source includes practical slicing strategies (vertical slices for full stack features, contract-first when backend and frontend develop in parallel, risk-first to validate uncertainty early) and hard rules like keeping the build green between increments and using feature flags for incomplete work. The increment checklist is straightforward: one thing per commit, tests pass, build succeeds, functionality verified. Most valuable when you're touching multiple files or feel tempted to write more than 100 lines before testing.

skills.sh installs: 71K
GitHub stars: 114.6K
last updated: Aug 21, 2026

View on GitHub

Install

$ npx -y skills add addyosmani/agent-skills --skill incremental-implementation --agent claude-code

Installs into .claude/skills of the current project.

Files

Incremental Implementation

Overview

Build in thin vertical slices — implement one piece, test it, verify it, then expand. Avoid implementing an entire feature in one pass. Each increment should leave the system in a working, testable state. This is the execution discipline that makes large features manageable.

When to Use

Implementing any multi-file change
Building a new feature from a task breakdown
Refactoring existing code
Any time you're tempted to write more than ~100 lines before testing

When NOT to use: Single-file, single-function changes where the scope is already minimal.

The Increment Cycle

┌──────────────────────────────────────┐
│                                      │
│   Implement ──→ Test ──→ Verify ──┐  │
│       ▲                           │  │
│       └───── Commit ◄─────────────┘  │
│              │                       │
│              ▼                       │
│          Next slice                  │
│                                      │
└──────────────────────────────────────┘

For each slice:

SKILL.md on GitHub