code-reviewer

code-reviewer is an agent for Claude Code from peterblazejewicz/claude-plugins. It costs 68 tokens per session (2,017 once invoked), scanned A, original, MIT.

A senior code-review agent for .NET and C# changes, covering correctness, readability, architecture, security, and performance. It considers applications built with .NET 8 or newer, Avalonia, ASP.NET Core, Blazor, MAUI, Entity Framework Core, and common test frameworks.

In plain words
What is it for?
Use it to review a pull request or proposed change and receive actionable findings grouped by issue type and application context.
Why use it?
It provides structured feedback on bugs, edge cases, design problems, security risks, and slow code before a change is merged.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: mentions subagents; mentions Claude Code.

Part of the dotnet-skills plugin — 24 skills, 9 commands, 4 agents shipped together

Good fit Use it to review a pull request or proposed change and receive actionable findings grouped by issue type and application context.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/peterblazejewicz/claude-plugins/code-reviewer
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/peterblazejewicz/claude-plugins

Made for: Claude Code.

Or install dotnet-skills, the plugin that ships this one along with the rest of its 24 skills, 9 commands, 4 agents.

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 code-reviewer

README.md
[![agentmods](https://agentmods.dev/badge/agents/peterblazejewicz/claude-plugins/code-reviewer/github.svg)](https://agentmods.dev/agents/peterblazejewicz/claude-plugins/code-reviewer)
Your own site
<a href="https://agentmods.dev/agents/peterblazejewicz/claude-plugins/code-reviewer"><img src="https://agentmods.dev/badge/agents/peterblazejewicz/claude-plugins/code-reviewer/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 code-reviewer

Your own site · 80×15
<a href="https://agentmods.dev/agents/peterblazejewicz/claude-plugins/code-reviewer"><img src="https://agentmods.dev/badge/agents/peterblazejewicz/claude-plugins/code-reviewer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 68 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,017 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 $0.00068 $0.02017
Opus 5.5 $0.00027 $0.00807
Sonnet 5.5 $0.00014 $0.00403
Haiku 4.5 $0.00007 $0.00202

Measured 1mo ago against content hash f5e2b45a8b44, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

code-reviewer 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 1mo 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.

plugins/dotnet-skills/agents/code-reviewer.agent.md · 138 lines

How it starts

The opening of the file, as written. The whole thing — 138 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Senior .NET Code Reviewer

You are an experienced Staff Engineer conducting a thorough code review of a .NET/C# change. Your role is to evaluate the proposed changes and provide actionable, categorized feedback.

For the full process documentation and checklist, see the sibling skill dotnet-skills:code-review-and-quality. This persona focuses on conducting the review — the skill documents the method.

Host-model lens. The five axes apply universally. Individual bullets sometimes anchor on a specific host model — server-side (ASP.NET Core) items like N+1 EF Core patterns, FromSqlRaw, antiforgery tokens, and [Authorize] policy checks won't apply to a pure Avalonia/MAUI client; client-side (Avalonia / MAUI / Blazor WebAssembly) items like dispatcher marshalling and AutomationProperties won't apply to an ASP.NET Core API. Where a bullet is host-specific, the host is named inline.

Review Framework

Evaluate every change across these five dimensions:

1. Correctness

  • Does the code do what the spec or task says it should?
  • Are edge cases handled (null, default(T), empty collections, boundary values, error paths)?
  • Do the xUnit / MSTest tests actually verify the behavior? Are they testing the right things?
  • Are there race conditions, off-by-one errors, or state inconsistencies?
  • Is async correctly awaited? No sync-over-async (.Result, .Wait(), GetAwaiter().GetResult()) on I/O paths?
  • Is CancellationToken threaded through I/O methods?
  • Are nullable-reference-type annotations honest (no ! null-forgiving operator papering over a real null)?
  • For library code consumed from non-ASP.NET-Core hosts (WPF, WinForms, MAUI, Avalonia UI thread), do public await expressions use .ConfigureAwait(false) to avoid capturing the caller's SynchronizationContext? (Not needed under ASP.NET Core — it has no SynchronizationContext since .NET Core 2.1.)

Read the full file on GitHub · 138 lines

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. 1mo ago First seen · 138 lines · 68 tokens per session scan A f5e2b45a8b44

Subscribe to this mod's changes

code-reviewer is an agent published in the GitHub repository peterblazejewicz/claude-plugins (8 stars, last pushed 4mo ago), licensed MIT. It adds 68 tokens to every session and 2,017 once invoked, about $0.0003 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 2026-08-31.