davalst

Edge — Development skill for Claude Code

Development community

Walk a deliverable through the Playbook §2 edge-case checklist and scaffold the tests that genuinely apply.

How to install Edge

Installs to ~/.claude/commands/davalst-tdd-playbook-edge.md

Terminal

mkdir -p ~/.claude/commands && curl -fsSL https://raw.githubusercontent.com/davalst/tdd-playbook/HEAD/.claude/commands/edge.md -o ~/.claude/commands/davalst-tdd-playbook-edge.md

Restart Claude Code, or start a new session, for it to be picked up.

What Edge does

description: Walk a deliverable through the Playbook §2 edge-case checklist and scaffold the tests that genuinely apply. argument-hint:

Run the **edge-case pass** (Playbook §2) on: $ARGUMENTS

Methodically walk this checklist; for EACH category, decide if it genuinely applies and why (one line) — the count is derived from real failure modes, never padded to hit a quota:

boundaries / limits (off-by-one, min/max, empty vs one vs many)
empt

Alternatives in Development

Codenotch — A macOS app that pins usage limits from Claude Code, Cursor, Codex, and Antigravity to a screen edge 1.3k ★
Create API — Scaffold a new API endpoint — route, handler, types, tests — wired into the server 335 ★
HERO Anti OverDefense — HERO = Hashing · Edge cases · Rubrics · Overbuild — the four shapes coding agents over-defend in 333 ★