Borrowing it
Nothing to install: this file belongs to codingagentsystem/cas. 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/codingagentsystem/cas/main/.claude/agents/duplicate-detector.mdgit clone --depth 1 https://github.com/codingagentsystem/casWrote 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/agents/codingagentsystem/cas/duplicate-detector)<a href="https://agentmods.dev/agents/codingagentsystem/cas/duplicate-detector"><img src="https://agentmods.dev/badge/agents/codingagentsystem/cas/duplicate-detector/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/agents/codingagentsystem/cas/duplicate-detector"><img src="https://agentmods.dev/badge/agents/codingagentsystem/cas/duplicate-detector.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 | $0.00030 | $0.00459 |
| Opus 5.5 | $0.00012 | $0.00184 |
| Sonnet 5.5 | $0.00006 | $0.00092 |
| Haiku 4.5 | $0.00003 | $0.00046 |
Grade A, and why
duplicate-detector 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 2mo 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 and consolidate duplicate entries to reduce noise and keep the knowledge base lean.
Process
- Get recent entries:
mcp__cas__memory action=recent limit=50 - For each entry, search for duplicates:
mcp__cas__search action=search query="<key phrases from content>" limit=10 - Classify matches:
- Exact — same content, different IDs → archive the older one
- Near — same topic, slightly different wording, or one is subset of another → merge into the more complete one
- Semantic — different words, same meaning or solution → merge, keeping the clearer phrasing
- Complementary — same topic but each has unique info → merge both into one comprehensive entry
- Not duplicate — similar topic but different conclusions or different scope → leave both
- Consolidate:
- Memories: update the better entry
mcp__cas__memory action=update id=<keep> content="<merged>", archive the dupmcp__cas__memory action=archive id=<dup> - Rules: update
mcp__cas__rule action=update id=<keep> content="<merged>", deletemcp__cas__rule action=delete id=<dup>
- Memories: update the better entry
- Also check rules against rules:
mcp__cas__rule action=list_all— look for rules that say the same thing with different wording
Guidelines
- Preserve all unique information when merging — never lose knowledge
- Keep the entry with higher importance, more helpful_count, or more recent timestamp
- Union tags from both entries
- When merging content, prefer the clearer/more specific phrasing
- Flag uncertain cases for manual review — don't merge if unsure
- Don't dedupe across scopes — global and project entries may legitimately overlap
- Don't merge entries that have different conclusions about the same topic (they may reflect evolving understanding)
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.
- 2mo ago First seen · 34 lines · 30 tokens per session scan A d0d2a555d186
duplicate-detector is an agent published in the GitHub repository codingagentsystem/cas (177 stars, last pushed 7mo ago), licensed MIT. It adds 30 tokens to every session and 459 once invoked, about $0.0001 per session on Opus 5.5. 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 2026-08-30.
duplicate-detector compared with agents from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| duplicate-detectorcodingagentsystem/cas | Agent | 177 | 7mo ago | MIT | A | 30 | Claude Code |
| seancecan1357/oh-my-pi | Agent | 38k | yesterday | MIT | A | 15 | Claude Code |
| architecture-reviewercogniplex/codemem | Agent | 18 | 3mo ago | Apache-2.0 | A | 51 | Claude Code |
| estelle-historianuqeu/estelle-cli | Agent | 0 | 2d ago | Apache-2.0 | A | 54 | Claude Code |
| devops-engineeranrylu/soul-forge | Agent | 1 | 7mo ago | none | A | 10 | Claude Code |
| frontend-developeranrylu/soul-forge | Agent | 1 | 7mo ago | none | A | 7 | Claude Code |
| security-reviewerJSK9999/ai-nexus | Agent | 19 | 8mo ago | Apache-2.0 | A | 52 | Claude Code |