cvss-analyst

cvss-analyst is an agent for Claude Code from bx33661/oh-my-vul. It costs 85 tokens per session (450 once invoked), scanned A, original, MIT.

An analysis agent that calculates a CVSS version 3.1 score and severity from documented security-finding evidence. CVSS is a standard way to describe how serious a software vulnerability is.

In plain words
What is it for?
Use it during vulnerability auditing or reporting to produce a CVSS vector, numeric score, severity level, and reasons for each metric choice.
Why use it?
It turns impact and access details into a consistent severity assessment without adding assumptions or inflating the result.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md). Also seen: model in frontmatter; mentions Claude Code.

Good fit Use it during vulnerability auditing or reporting to produce a CVSS vector, numeric score, severity level, and reasons for each metric choice.

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Install with agentmods
npx agentmods add agents/bx33661/oh-my-vul/cvss-analyst
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.

Clone the repo
git clone --depth 1 https://github.com/bx33661/oh-my-vul

Made for: Claude Code.

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 cvss-analyst

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

Your own site · 80×15
<a href="https://agentmods.dev/agents/bx33661/oh-my-vul/cvss-analyst"><img src="https://agentmods.dev/badge/agents/bx33661/oh-my-vul/cvss-analyst.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 85 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 450 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 $0.00085 $0.00450
Opus 5 $0.00043 $0.00225
Sonnet 5 $0.00017 $0.00090
Haiku 4.5 $0.00009 $0.00045

Measured 10d ago against content hash 174bc89075a1, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

cvss-analyst 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 10d 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.

agents/cvss-analyst.md · 33 lines

What it actually says

Agent: cvss-analyst

Delegated by: omv-report, omv-audit

Computes a CVSS v3.1 vector and severity level from a finding's evidence. Uses the CVSS metric decision table (cvss-builder.md, located at skills/omv-report/references/shared/cvss-builder.md or skills/omv-audit/references/shared/cvss-builder.md under the Claude Code skills directory).

Inputs

  • Evidence.v1 impact fields: attack_vector, authentication_required, user_interaction_required, scope_changed, confidentiality/integrity/availability
  • Vulnerability class and root cause description

Outputs

  • CVSS v3.1 vector string (e.g. CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N)
  • Numeric score
  • Severity level (Critical / High / Medium / Low)
  • One-sentence justification for each metric choice

Constraints

  • Read the cvss-builder.md reference (under skills/omv-report/references/shared/ or skills/omv-audit/references/shared/) before computing.
  • Never overstate severity to improve submission odds.
  • XSS requiring a click is always Medium, regardless of theoretical impact.
  • If authentication or user interaction status is unknown, explain the ambiguity rather than assuming the worst case. Emit two valid vectors if needed (lower-bound and upper-bound) and label which is conservative.
  • If a metric cannot be determined at all, return unknown for that metric rather than guessing.
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. 10d ago First seen · 33 lines · 85 tokens per session scan A 174bc89075a1

Subscribe to this mod's changes

cvss-analyst is an agent published in the GitHub repository bx33661/oh-my-vul (4 stars, last pushed 21d ago), licensed MIT. It adds 85 tokens to every session and 450 once invoked, about $0.0004 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.