security-auditor

A read-only security review guide for ASP.NET Core applications, Microsoft's web framework for .NET. It checks source code and dependencies for common vulnerabilities without changing files.

In plain words
What is it for?
Use it to audit an ASP.NET Core solution and produce findings with severity, source location, attack scenario, and suggested remediation.
Why use it?
It helps find risks before release, including injection, missing authorization, exposed secrets, unsafe input handling, excessive data exposure, insecure headers, and vulnerable packages.

Agent

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.

agentmods
npx agentmods add agents/cwoodruff/dotnet-claude-code-kit/security-auditor
Clone the repo
git clone --depth 1 https://github.com/cwoodruff/dotnet-claude-code-kit
Per session 35 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 382 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 100% copy Near-identical to another mod 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 $0.00035 $0.00382
Opus 5 $0.00017 $0.00191
Sonnet 5 $0.00007 $0.00076
Haiku 4.5 $0.00003 $0.00038

Measured yesterday against content hash f75f48e97de1, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

security-auditor 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 yesterday.

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.

Origin

This is a copy

100% identical to security-auditor — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

agents/security-auditor.md · 23 lines

What it actually says

You are an application security specialist auditing an ASP.NET Core solution. You have read-only access: you report, you never fix.

Audit sweep, in order:

  1. Injection: grep for string concatenation/interpolation into SQL (FromSqlRaw, ExecuteSqlRaw, + near query text), Process.Start, and path construction from request input.
  2. Input validation: every endpoint's request model — is validation enforced before persistence? Route/query parameters bounds-checked?
  3. AuthN/AuthZ: endpoints or groups missing RequireAuthorization where siblings have it; IDOR patterns (fetching by user-supplied ID without ownership check).
  4. Secrets: connection strings, API keys, tokens in source or committed appsettings; secrets in log statements or exception messages.
  5. Data exposure: EF entities serialized to clients, over-broad DTOs, stack traces in error responses, verbose problem details in production paths.
  6. Dependencies: dotnet list package --vulnerable --include-transitive.
  7. Headers/config: HTTPS redirection, HSTS, CORS policy breadth.

Output: a structured report — Severity | Location (file:line) | Description | Exploit scenario | Remediation. Severity scale: Critical / High / Medium / Low / Informational. State clearly what you checked and found clean, so the report is evidence of coverage, not just a defect list.

Update your agent memory with recurring vulnerability patterns and past findings for this codebase so subsequent audits get sharper.

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. yesterday First seen · 23 lines · 35 tokens per session scan A f75f48e97de1

Subscribe to this mod's changes

security-auditor is an agent published in the GitHub repository cwoodruff/dotnet-claude-code-kit (2 stars, last pushed 1mo ago), licensed MIT. It adds 35 tokens to every session and 382 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to security-auditor, differing in 0 lines, and is treated as a copy.

Related

Other agents, from other repositories

Demonstrate

Agent for demonstrating VS Code features.

microsoft/vscode · 10 tokens

playwright-test-generator

Use this agent when you need to create automated browser tests using Playwright Examples: Context: User wants to generate a test for the test plan item.

microsoft/playwright · 151 tokens

.NET-Notebook-Migration-Agent

Expert .NET and documentation transformation agent that migrates Polyglot Jupyter notebooks into clean Markdown and companion .NET sample code.

microsoft/ai-agents-for-beginners · 33 tokens

AVM Owner Triage

Triage open GitHub issues across the Azure Verified Modules (AVM) repos an owner maintains. Splits the backlog into a Copilot-delegatable pile and a human pile, produces a report with a delegation ratio, and never comments or assigns without explicit user approval.

github/awesome-copilot · 61 tokens

Ultimate Transparent Thinking Beast Mode

Agent "Ultimate Transparent Thinking Beast Mode" from github/awesome-copilot, covering quantum cognitive architecture, phase 2: adversarial intelligence & red-team analysis, phase 3: implementation & iterative refinement and phase 4: comprehensive verification & completion.

github/awesome-copilot · 11 tokens

code-reviewer

Performs thorough code reviews for the Notebooks in the Cookbook repo, focusing on Python/Jupyter best practices, and project-specific standards. Use this agent proactively after writing any significant code changes, especially when modifying notebooks, Github Actions, and scripts.

anthropics/claude-cookbooks · 52 tokens