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.
curl -O https://raw.githubusercontent.com/managedcode/dotPilot/main/.codex/skills/mcaf-solid-maintainability/SKILL.mdgit clone --depth 1 https://github.com/managedcode/dotPilotWrote 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.
[](https://agentmods.dev/skills/managedcode/dotpilot/mcaf-solid-maintainability)<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>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.
| Model | Per session | Once 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 |
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.
Copies of this mod
1 near-identical copy found in the catalogue:
- mcaf-solid-maintainability — 89% identical, 21 lines differ
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.mdneed 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
- Read the nearest
AGENTS.mdand confirm scope and constraints. - Run this skill's
Workflowthrough theRalph Loopuntil outcomes are acceptable. - Return the
Required Result Formatwith concrete artifacts and verification evidence.
Workflow
- Read the active values for:
file_max_loctype_max_locfunction_max_locmax_nesting_depthexception_policy
- Evaluate the change through SOLID:
- single responsibility
- explicit dependencies
- composition before inheritance
- boundaries that are easy to test
- Remove hardcoded values and inline string literals from implementation code by moving them into named constants, enums, configuration, or dedicated types.
- Split by responsibility, not by arbitrary line count alone.
- If a limit must be exceeded temporarily, document the exception exactly where
exception_policyrequires 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
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.
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.
- 3d ago First seen · 115 lines · 57 tokens per session scan A ab8298a7e359
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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