Is the Solidifier skill free?

Yes. The skill itself is free from FernandoJRR/solidifier. SkillProof publishes the install command and an independent test verdict at no cost.

What is the Solidifier SkillProof Score?

9.2/10 — installs cleanly 5/5, triggers reliably 5/5, output vs. baseline 8/10, docs & honesty 5/5.

How do I install Solidifier?

Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.

Can I use Solidifier with Cursor, Copilot, Gemini CLI, Codex or other AI tools?

The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.

Solidifier

SOLID refactoring with restraint — measurably less abstraction bloat

by FernandoJRR · FernandoJRR/solidifier

Tested · Works

Install — copy the command Download source ↗

Test report

Verdict: Tested · Works
Score: 9.2/10
Tested: Jul 17, 2026
Environment: Claude Code 2.x (agent harness)
Upstream re-checked: Aug 10, 2026 · 2a12fb1

Refactored the same tangled Python billing service twice: without the skill the result was 178 lines and 14 classes of ABC-and-factory ceremony; following the skill produced a behavior-identical 111-line, 3-class version, with equivalence proven by a shared test harness run against the original. The skill's restraint rules measurably prevented abstraction bloat while keeping the pure logic testable without any I/O mocks. It also correctly left an already-clean helper file untouched, exactly as its docs promise. Install command verified verbatim from a bare HOME with no ~/.claude.

Scored on four weighted criteria — install, triggering, output vs. baseline, docs. How scoring works

Installs cleanly 5/5
Triggers reliably 5/5
Output vs. baseline 8/10
Docs & honesty 5/5

What Solidifier does

Applies SOLID principles and design patterns to backend code with explicit restraint rules: prefer a function over a class, a class over an interface, and no pattern without a named axis of variation. Triggers on refactoring, design review, coupling, testability, and 'hard to change' requests in any backend language, with a .solidifier.json config for rigor level, scope globs, and pattern allow/deny lists.

How to install Solidifier

git clone https://github.com/FernandoJRR/solidifier
mkdir -p ~/.claude/skills
cp -r solidifier/claude-code/plugins/solidifier/skills/solidifier ~/.claude/skills/solidifier

Skills live in ~/.claude/skills/ (global) or .claude/skills/ (per-project). Restart Claude Code after installing.

Commands — how to trigger Solidifier

/solidifier SOLID refactoring with restraint — measurably less abstraction bloat

It also activates on plain-language prompts like these:

Refactor this billing service so it's easier to test and change
This class is hard to change, apply SOLID without overdoing it
Clean up the coupling in this module but don't add interfaces

Frequently asked questions

Is the Solidifier skill free?: Yes. The skill itself is free from FernandoJRR/solidifier. SkillProof publishes the install command and an independent test verdict at no cost.
Does Solidifier work with Claude Code?: We tested it with Claude Code 2.x (agent harness) on Jul 17, 2026. Verdict: Tested · Works. Refactored the same tangled Python billing service twice: without the skill the result was 178 lines and 14 classes of ABC-and-factory ceremony; following the skill produced a behavior-identical 111-line, 3-class version, with equivalence proven by a shared test harness run against the original. The skill's restraint rules measurably prevented abstraction bloat while keeping the pure logic testable without any I/O mocks. It also correctly left an already-clean helper file untouched, exactly as its docs promise. Install command verified verbatim from a bare HOME with no ~/.claude.
What is the Solidifier SkillProof Score?: 9.2/10 — installs cleanly 5/5, triggers reliably 5/5, output vs. baseline 8/10, docs & honesty 5/5.
How do I install Solidifier?: Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.
Can I use Solidifier with Cursor, Copilot, Gemini CLI, Codex or other AI tools?: The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.