dotPilot: Skill for Codex

.codex/skills/mcaf-solid-maintainability/SKILL.md

mcaf-solid-maintainability is a skill for Codex from managedcode/dotPilot. It costs 57 tokens per session (971 once invoked), scanned A, original, MIT.

A code-maintenance guide for applying design principles such as keeping each class focused, reducing dependencies, and favouring composition over inheritance.

In plain words
What is it for?
Use it when refactoring oversized files or classes, setting code-size limits in AGENTS.md, reviewing design quality, or documenting temporary exceptions.
Why use it?
It helps prevent large, tightly connected code from becoming difficult to change. It also makes exceptions and maintainability rules explicit for future work.

Skill for Codex

Written for Codex: installed under .codex/. Also seen: mentions AGENTS.md.

This is managedcode/dotPilot's own configuration. It tells Codex how to work on dotPilot itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything dotPilot configures →

Reuse

Borrowing it

Nothing to install: this file belongs to managedcode/dotPilot. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/managedcode/dotPilot/main/.codex/skills/mcaf-solid-maintainability/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/managedcode/dotPilot

Made for: Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for mcaf-solid-maintainability

README.md
[![agentmods](https://agentmods.dev/badge/skills/managedcode/dotpilot/mcaf-solid-maintainability.svg)](https://agentmods.dev/skills/managedcode/dotpilot/mcaf-solid-maintainability)
Your own site
<a href="https://agentmods.dev/skills/managedcode/dotpilot/mcaf-solid-maintainability"><img src="https://agentmods.dev/badge/skills/managedcode/dotpilot/mcaf-solid-maintainability.svg" alt="Measured on agentmods" height="20"></a>
Per session 57 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 971 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00057 $0.00971
Opus 5 $0.00028 $0.00485
Sonnet 5 $0.00011 $0.00194
Haiku 4.5 $0.00006 $0.00097

Measured 3d ago against content hash ab8298a7e359, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

mcaf-solid-maintainability 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 3d 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.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

.codex/skills/mcaf-solid-maintainability/SKILL.md · 115 lines

How it starts

The opening of the file, as written. The whole thing — 115 lines — stays where its author put it; the contents beside it link to each section on GitHub.

MCAF: SOLID Maintainability

Trigger On

  • files, classes, or functions are too large or too coupled
  • maintainability limits in AGENTS.md need to be added or tightened
  • a change needs a justified temporary exception

Value

  • produce a concrete project delta: code, docs, config, tests, CI, or review artifact
  • reduce ambiguity through explicit planning, verification, and final validation skills
  • leave reusable project context so future tasks are faster and safer

Do Not Use For

  • writing architecture docs without touching code structure or policy
  • cosmetic formatting-only edits

Inputs

  • the nearest AGENTS.md
  • the code under change
  • current testing seams and dependency boundaries

Quick Start

  1. Read the nearest AGENTS.md and confirm scope and constraints.
  2. Run this skill's Workflow through the Ralph Loop until outcomes are acceptable.
  3. Return the Required Result Format with concrete artifacts and verification evidence.

Workflow

  1. Read the active values for:
    • file_max_loc
    • type_max_loc
    • function_max_loc
    • max_nesting_depth
    • exception_policy
  2. Evaluate the change through SOLID:
    • single responsibility
    • explicit dependencies
    • composition before inheritance
    • boundaries that are easy to test
  3. Remove hardcoded values and inline string literals from implementation code by moving them into named constants, enums, configuration, or dedicated types.
  4. Split by responsibility, not by arbitrary line count alone.
  5. If a limit must be exceeded temporarily, document the exception exactly where exception_policy requires it.

Deliver

  • smaller, more cohesive code
  • updated maintainability policy when repo rules changed
  • explicit exception records when a temporary breach is justified

Validate

  • size limits are respected or explicitly waived
  • responsibilities are clearer after the change
  • the refactor improves testability instead of only moving lines around
  • literals that matter are named once and reused instead of repeated inline
  • no numeric limit was moved into framework prose or skill metadata

Read the full file on GitHub · 115 lines

Files

What ships with it

3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 3d ago First seen · 115 lines · 57 tokens per session scan A ab8298a7e359

Subscribe to this mod's changes

mcaf-solid-maintainability is a skill published in the GitHub repository managedcode/dotPilot (23 stars, last pushed 4mo ago), licensed MIT. It adds 57 tokens to every session and 971 once invoked, about $0.0003 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 2026-09-03.

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