MCPGateway: Skill for Codex

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