Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add berkcangumusisik/claude-code-practices --skill duplicate-findergit clone --depth 1 https://github.com/berkcangumusisik/claude-code-practicesWrote 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/berkcangumusisik/claude-code-practices/duplicate-finder)<a href="https://agentmods.dev/skills/berkcangumusisik/claude-code-practices/duplicate-finder"><img src="https://agentmods.dev/badge/skills/berkcangumusisik/claude-code-practices/duplicate-finder/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/berkcangumusisik/claude-code-practices/duplicate-finder"><img src="https://agentmods.dev/badge/skills/berkcangumusisik/claude-code-practices/duplicate-finder.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00017 | $0.00260 |
| Opus 5 | $0.00009 | $0.00130 |
| Sonnet 5 | $0.00003 | $0.00052 |
| Haiku 4.5 | $0.00002 | $0.00026 |
Grade A, and why
duplicate-finder 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 9d 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.
What it actually says
Find Duplicate Code
- Look for structural duplication:
# Similar function signatures
grep -rn "async function\|const .* = async" ${1:-src}/ --include="*.ts" | sort | head -40
# Similar patterns (fetch calls, error handling, etc.)
grep -rn "try {" ${1:-src}/ --include="*.ts" -l
-
Read suspected duplicate files side by side.
-
Identify duplication categories:
- Identical blocks: copy-pasted code
- Near-duplicates: same logic, different variable names
- Structural similarity: same pattern, different implementations
-
For each duplication cluster:
- Show the duplicated sections
- Propose a shared abstraction (utility function, custom hook, base class)
- Show how call sites would look after extraction
-
Ask which ones to consolidate, then apply.
Focus on impactful duplications (3+ occurrences or > 20 lines).
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.
- 9d ago First seen · 36 lines · 17 tokens per session scan A a622689c3029
duplicate-finder is a skill published in the GitHub repository berkcangumusisik/claude-code-practices (10 stars, last pushed 4mo ago), licensed MIT. It adds 17 tokens to every session and 260 once invoked, about $0.0001 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 2026-08-31.
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