Error Codes

Every stolid diagnostic is an SLDxxx code. The leading digit groups codes by the concern they enforce, so a whole family can be reasoned about — or silenced — together:

• SLD1xx — testing and dynamic execution (mocking, exec/eval).

• SLD2xx — abstract base classes and wide-module coupling.

• SLD3xx — object-oriented design and the enum-over-strings smells.

• SLD4xx — inheritance from concrete classes.

• SLD5xx — dataclass configuration (frozen, slotted, keyword-only).

• SLD6xx — code complexity (function weight, argument counts, cleanup).

• SLD7xx — naming (vague words, shadowing, confusable pairs).

• SLD8xx — cross-file contracts, documentation, and import-graph architecture (the checks that need a workspace-wide view).

• SLD9xx — privacy and the underscore-prefix convention.

Each page below lists the codes in its family with the rationale and a bad/good example where one helps.

• SLD1xx - Testing and Dynamic Execution
• SLD2xx - Abstract Base Classes
• SLD3xx - Object-Oriented Design
• SLD4xx - Inheritance
• SLD5xx - Dataclass Configuration
• SLD6xx - Code Complexity
• SLD7xx - Naming
• SLD8xx - Cross-File Contracts, Documentation, and Architecture
• SLD9xx - Privacy