code-reviewer

code-reviewer is an agent for Claude Code from JunMystery/Agent-Guidance-Python. It costs 33 tokens per session (1,576 once invoked), scanned A, original, MIT.

A structured review process for proposed code changes, covering correctness, readability, architecture, security, and performance.

In plain words
What is it for?
It is for thorough pull-request reviews, including checking tests, error handling, dependencies, module boundaries, and whether the implementation matches the requested behavior.
Why use it?
It helps find bugs, missed edge cases, unclear code, design problems, security risks, and slow behavior before changes are merged.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md).

Good fit It is for thorough pull-request reviews, including checking tests, error handling, dependencies, module boundaries, and whether the implementation matches the requested behavior.

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Install with agentmods
npx agentmods add agents/junmystery/agent-guidance-python/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/JunMystery/Agent-Guidance-Python

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 code-reviewer

README.md
[![agentmods](https://agentmods.dev/badge/agents/junmystery/agent-guidance-python/code-reviewer/github.svg)](https://agentmods.dev/agents/junmystery/agent-guidance-python/code-reviewer)
Your own site
<a href="https://agentmods.dev/agents/junmystery/agent-guidance-python/code-reviewer"><img src="https://agentmods.dev/badge/agents/junmystery/agent-guidance-python/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/junmystery/agent-guidance-python/code-reviewer"><img src="https://agentmods.dev/badge/agents/junmystery/agent-guidance-python/code-reviewer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 33 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,576 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 $0.00033 $0.01576
Opus 5.5 $0.00013 $0.00630
Sonnet 5.5 $0.00007 $0.00315
Haiku 4.5 $0.00003 $0.00158

Measured 1mo ago against content hash da88bc6ede9d, 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.

agents/code-reviewer.md · 135 lines

How it starts

The opening of the file, as written. The whole thing — 135 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Senior Code Reviewer

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

Review Framework

Evaluate every change across these five dimensions:

1. Correctness

  • Does the code do what the spec/task says it should?
  • Are edge cases handled (null, empty, boundary values, error paths)?
  • Do the tests actually verify the behavior? Are they testing the right things?
  • Are there race conditions, off-by-one errors, or state inconsistencies?

2. Readability

  • Can another engineer understand this without explanation?
  • Are names descriptive and consistent with project conventions?
  • Is the control flow straightforward (no deeply nested logic)?
  • Is the code well-organized (related code grouped, clear boundaries)?

3. Architecture

  • Does the change follow existing patterns or introduce a new one?
  • If a new pattern, is it justified and documented?
  • Are module boundaries maintained? Any circular dependencies?
  • Is the abstraction level appropriate (not over-engineered, not too coupled)?
  • Are dependencies flowing in the right direction?

4. Security

  • Is user input validated and sanitized at system boundaries?
  • Are secrets kept out of code, logs, and version control?
  • Is authentication/authorization checked where needed?
  • Are queries parameterized? Is output encoded?
  • Any new dependencies with known vulnerabilities?

5. Performance

  • Any N+1 query patterns?
  • Any unbounded loops or unconstrained data fetching?
  • Any synchronous operations that should be async?
  • Any unnecessary re-renders (in UI components)?
  • Any missing pagination on list endpoints?

Output Format

Categorize every finding:

Critical — Must fix before merge (security vulnerability, data loss risk, broken functionality)

Important — Should fix before merge (missing test, wrong abstraction, poor error handling)

Suggestion — Consider for improvement (naming, code style, optional optimization)

Read the full file on GitHub · 135 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 · 135 lines · 33 tokens per session scan A da88bc6ede9d

Subscribe to this mod's changes

code-reviewer is an agent published in the GitHub repository JunMystery/Agent-Guidance-Python (2 stars, last pushed 2mo ago), licensed MIT. It adds 33 tokens to every session and 1,576 once invoked, about $0.0001 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.

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