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omv-dedup

omv-dedup is a skill for Claude Code, Codex from bx33661/oh-my-vul. It costs 91 tokens per session (921 once invoked), scanned A, original, MIT.

A security-researching tool that checks whether a reported software bug has already been disclosed publicly. It searches vulnerability databases and public discussions such as issues, pull requests, commits, and blogs.

In plain words
What is it for?
Use it to assess duplicate risk for a local security finding and produce repeatable searches across advisory databases and public sources.
Why use it?
It helps avoid submitting a finding as new when someone has already reported the same problem, even if no formal vulnerability record exists yet.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

not rated 4repo 22d ago A scan 91 tokens original MIT

Good fit Use it to assess duplicate risk for a local security finding and produce repeatable searches across advisory databases and public sources.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/bx33661/oh-my-vul/omv-dedup
View source ↗ bx33661/oh-my-vul npmjs.com
Install

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.

Any agent
npx skills add bx33661/oh-my-vul --skill omv-dedup
Clone the repo
git clone --depth 1 https://github.com/bx33661/oh-my-vul

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for omv-dedup

README.md
[![agentmods](https://agentmods.dev/badge/skills/bx33661/oh-my-vul/omv-dedup/github.svg)](https://agentmods.dev/skills/bx33661/oh-my-vul/omv-dedup)
Your own site
<a href="https://agentmods.dev/skills/bx33661/oh-my-vul/omv-dedup"><img src="https://agentmods.dev/badge/skills/bx33661/oh-my-vul/omv-dedup/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.

agentmods 80×15 button for omv-dedup

Your own site · 80×15
<a href="https://agentmods.dev/skills/bx33661/oh-my-vul/omv-dedup"><img src="https://agentmods.dev/badge/skills/bx33661/oh-my-vul/omv-dedup.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 91 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 921 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00091 $0.00921
Opus 5 $0.00046 $0.00461
Sonnet 5 $0.00018 $0.00184
Haiku 4.5 $0.00009 $0.00092

Measured 11d ago against content hash 13a27bee6892, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

omv-dedup 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 11d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/check_output.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

skills/omv-dedup/SKILL.md · 89 lines

How it starts

The opening of the file, as written. The whole thing — 89 lines — stays where its author put it; the contents beside it link to each section on GitHub.

omv-dedup

Assess duplicate disclosure risk for a local finding.

Invocation

/omv-dedup <id>

Core Rule

Advisory databases lag public discussion. A bug can be well known in issue trackers, fix PRs, or blog posts for months or years before any CVE or GHSA entry exists — and sometimes no advisory ever appears. "Advisory-clean" does NOT mean novel.

A public issue, pull request, or commit that discloses the same vulnerability makes the finding a duplicate for submission purposes, even without a CVE. First-disclosure credit belongs to whoever reported it publicly first.

Workflow

  1. Read .omv/findings/<id>.yaml using contracts/evidence.v1.yaml as the local schema reference.
  2. Run omv dedup <id> to produce deterministic queries for all six sources:
    • Advisory: NVD, GHSA, OSV, ecosystem advisory database.
    • Public discussion: upstream GitHub issues and pull requests (open and closed), upstream commit history, and a public web search (blogs, aggregators, VulDB-style databases).
  3. Show the queries before conclusions.
  4. Execute each query passively. For issues/PRs search the repo for the vulnerability class keywords (eval, traversal, RCE, prototype, sandbox...), not just the package name — reporters rarely use canonical class names.
  5. Compare package, ecosystem, affected range, vulnerability class, CWE, source, sink, guard, and fixed version signals.
  6. Grade novelty risk as High, Medium, or Low.
  7. Only after user confirmation, write fields with:
    • omv dedup <id> --confirm --existing-cve <CVE|none> --notes <summary>

Risk Rules

  • High: same package plus same vulnerability class plus overlapping affected range or sink behavior — OR any public issue/PR/commit disclosing the same bug, regardless of whether a CVE exists.
  • Medium: same package or same sink behavior, but incomplete version or guard overlap; or a locked/obscure discussion that might describe the bug ambiguously.
  • Low: no close advisory match AND no public discussion match after source-specific searches of all six sources.

Read the full file on GitHub · 89 lines

Files

What ships with it

4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

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.

  1. 11d ago First seen · 89 lines · 91 tokens per session scan A 13a27bee6892

Subscribe to this mod's changes

omv-dedup is a skill published in the GitHub repository bx33661/oh-my-vul (4 stars, last pushed 22d ago), licensed MIT. It adds 91 tokens to every session and 921 once invoked, about $0.0005 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.

CVEResearchSecurityai-skillsclaude-skillsgithub-advisoryopen-source-securitysecurity-research
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