How do I install the Modify Feature Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/modify-feature/SKILL.md and restart Claude Code. Both flows are detailed at https://claudskills.com/install/.

Is this skill free to install?

Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.

ClaudSkills / Engineering / performance

Modify Feature

Category: Engineering · Sub-category: performance · Last updated: 2026-05-21

You MUST use this skill before changing, enhancing, or refactoring any existing functionality. Use when the code already exists and you are altering its behavior, performance, or structure — not fixing a bug. Stronger signals: "modify", "refactor", "optimize", "improve", "change how X works", "enhance", "update the logic". Use sextant:add-feature instead when the thing being built does not yet exist. Use sextant:fix-bug instead when the existing behavior is broken and needs to be restored.

From the source SKILL.md

!../principles/SKILL_BODY.md

What this skill does

Modify Feature is a community-contributed Claude Code skill in the performance sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/modify-feature/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when the code already exists and you are altering its behavior, performance, or structure — not fixing a bug. Stronger signals: "modify", "refactor", "optimize", "improve", "change how X works", "enhance", "update the logic".

Who uses this skill

The Modify Feature Claude Code skill is built for software engineers, backend developers, full-stack teams, and technical leads building and maintaining production systems. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 69,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/modify-feature
curl -L https://claudskills.com/skills/modify-feature/SKILL.md \
  -o ~/.claude/skills/modify-feature/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/modify-feature/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/modify-feature/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\modify-feature\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Attribution & license

Source: https://github.com/hellotern/Sextant/blob/HEAD/skills/modify-feature/SKILL.md
License: MIT
Author: hellotern

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Modify Feature

From the source SKILL.md

What this skill does

Who uses this skill

How to install

Manual install (2 steps)

One-click install via the desktop app

Attribution & license

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