solid-fix

A code-maintenance skill that fixes violations of all five SOLID design principles, which are guidelines for keeping software easier to change and test.

In plain words
What is it for?
Finding and fixing SOLID problems in changed files or a specified path, then summarizing the proposed changes before applying them.
Why use it?
It groups related design fixes into one review and confirmation step instead of changing code without approval.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/muthuspark/solid-audit/solid-fix
Any agent
npx skills add muthuspark/solid-audit --skill solid-fix
Clone the repo
git clone --depth 1 https://github.com/muthuspark/solid-audit

Made for: Claude Code, Codex.

Per session 20 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,397 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00020 $0.01397
Opus 5 $0.00010 $0.00698
Sonnet 5 $0.00004 $0.00279
Haiku 4.5 $0.00002 $0.00140

Measured 2d ago against content hash a963e2b5de02, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

solid-fix scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

solid-audit/skills/solid-fix/SKILL.md · 121 lines

How it starts

The opening of the file, as written. The whole thing — 121 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Trigger

This skill activates when the user runs /solid-fix (optionally with a file path argument, e.g. /solid-fix src/services/order.py).

Scope Detection

Determine which files to analyze using this priority order:

  1. Argument — If the user provided a file or directory path after /solid-fix, use that directly.
  2. Git staged — Run git diff --cached --name-only. If output is non-empty, use those files.
  3. Git unstaged — Run git diff --name-only. If output is non-empty, use those files.
  4. Ask user — If no git diff is available, ask for a file or directory path.

Always skip: *.lock, package-lock.json, yarn.lock, pnpm-lock.yaml, Gemfile.lock, composer.lock, **/migrations/**, **/__generated__/**, **/fixtures/**, **/*.min.js

Orchestration Logic

Run all five SOLID principle analyses sequentially in this order: S → O → L → I → D

This order is deliberate:

  • SRP extraction changes the class structure that OCP/DIP fixes might also target
  • Running S first ensures the class boundaries are stable before open/closed or injection fixes are proposed

Step 1 — Collect All Violations

For each principle in order, analyze the scoped files:

S — Single Responsibility: Classes/functions with multiple unrelated concerns O — Open/Closed: Switch-on-type chains, isinstance dispatch, direct subclass instantiation by condition L — Liskov Substitution: raise NotImplementedError in overrides, narrowed preconditions, strengthened postconditions I — Interface Segregation: Fat ABCs/interfaces where implementors stub ≥ half the methods D — Dependency Inversion: Concrete class instantiation in constructors, no abstraction layer

Group all violations by principle. A violation flagged as unsafe (safe_to_fix = false) during analysis is kept in the report but marked as skipped.

Step 2 — Present Grouped Confirmation Prompt

Present one single confirmation prompt listing all violations grouped by principle:

Read the full file on GitHub · 121 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 121 lines · 20 tokens per session scan A a963e2b5de02

Subscribe to this mod's changes

solid-fix is a skill published in the GitHub repository muthuspark/solid-audit (5 stars, last pushed 5mo ago), licensed Apache-2.0. It adds 20 tokens to every session and 1,397 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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