ai-for-dummies/public/submitted-skills/Tatyana Ardyntceva/skills/duplicate-code-check/SKILL.md

name, description

name	description
duplicate-code-check	Find and report code duplication introduced by a merge request. Use when asked to check for duplicates, repeated logic, or copy-paste code in a branch or MR diff.

Duplicate Code Check

Scans the diff of a branch or merge request for duplicated logic and produces a structured report with locations, severity and suggested actions. Does not remove any code without explicit user approval.

Input

User should provide:

• branch name where duplication check should be done
• target branch name to compare

Steps

1. Fetch the diff for the branch or MR

2. Scan the diff for duplicate blocks. Use criteria:

   • identical or near-identical method bodies (more than 10 lines);
   • copy-pasted conditional blocks or switch/case arms;
   • repeated string literals or constants that could be extracted;
   • utility functions that already exist elsewhere in the codebase.

3. Ask the user before suggesting any removal

4. Write the report.

Output format

Create the file duplication-check-<branch name>.md with the table with next columns:

• all duplications
• risk level of removing each code duplication
• user decision is necessary.

Rules

• Always check that safe delete is being suggested and there are no usages of removed code.
• Always ask before removing any code duplication.

Passing criteria

The skill is complete only if:

• all files in the diff were scanned;
• no code was modified without explicit user approval;
• the report is written to duplication-check-<branch name>.md file.