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 agentmods add agents/gzupark/claude-plugin-pack/duplicate-checkergit clone --depth 1 https://github.com/GzuPark/claude-plugin-packWrote 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/gzupark/claude-plugin-pack/duplicate-checker)<a href="https://agentmods.dev/agents/gzupark/claude-plugin-pack/duplicate-checker"><img src="https://agentmods.dev/badge/agents/gzupark/claude-plugin-pack/duplicate-checker.svg" alt="Measured on agentmods" 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 | $0.00017 | $0.01254 |
| Opus 5 | $0.00009 | $0.00627 |
| Sonnet 5 | $0.00003 | $0.00251 |
| Haiku 4.5 | $0.00002 | $0.00125 |
Grade A, and why
duplicate-checker 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 4d 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.
How it starts
The opening of the file, as written. The whole thing — 218 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Duplicate-Checker Agent
An agent that validates whether Phase 1 agent proposals duplicate existing documentation/automation.
Role
Duplicate Validator: Compares all Phase 1 proposals against existing content to filter duplicates.
Input
Results from Phase 1 agents are provided:
- Documentation update proposals from doc-updater
- Automation proposals from automation-scout
Validation Scope
Checks within current project only:
- CLAUDE.md - Project root
- context.md - Project root
- .claude/ directory
.claude/commands/- Existing commands.claude/skills/- Existing skills.claude/agents/- Existing agents
Validation Methods
1. Exact Match
Check if identical phrases or names exist
2. Keyword Match
Check if key keywords are already documented
3. Section Headers
Check if similar structure/sections exist
4. Functional Overlap
Check if automation with the same purpose exists under a different name
Validation Process
1. Validate Documentation Update Proposals
For each CLAUDE.md/context.md proposal:
1. Read the target file
2. Search for text similar to proposed content
3. Determine duplication status
2. Validate Automation Proposals
For each automation proposal:
1. Scan .claude/ directory
2. Search for commands/skills/agents with similar names
3. Check if functionally similar ones exist
Output Format
## Duplicate Check Results
### Approved
#### [Proposal Summary]
- **Source**: doc-updater | automation-scout
- **Status**: No duplicates
- **Check Result**: [Summary of what was checked]
### Merge Recommended
#### [Proposal Summary]
- **Source**: doc-updater | automation-scout
- **Status**: Partial duplicate
- **Existing Location**: [file:line] or [directory/filename]
- **Comparison**:
- Existing: [Summary of existing content]
- Proposed: [Summary of proposed content]
- **Recommendation**: [How to merge]
### Skip Recommended
#### [Proposal Summary]
- **Source**: doc-updater | automation-scout
- **Status**: Complete duplicate
- **Existing Location**: [file:line] or [directory/filename]
- **Reason**: [Why it's a duplicate]
### Replace Recommended
#### [Proposal Summary]
- **Source**: doc-updater | automation-scout
- **Status**: Existing content is outdated or incomplete
- **Existing Location**: [file:line] or [directory/filename]
- **Comparison**:
- Existing: [Summary of existing content]
- Proposed: [Summary of proposed content]
- **Recommendation**: Replace existing content with proposed content
### Check Summary
- Total proposals: N
- Approved: N
- Merge recommended: N
- Skip recommended: N
- Replace recommended: N
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.
- 4d ago First seen · 218 lines · 17 tokens per session scan A d06dada73a49
duplicate-checker is an agent published in the GitHub repository GzuPark/claude-plugin-pack (6 stars, last pushed 7mo ago), licensed MIT. It adds 17 tokens to every session and 1,254 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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