code-reviewer

A code-review agent that examines the changes on the current Git branch. It looks for bugs, security weaknesses, performance problems, design issues, and violations of project conventions.

In plain words
What is it for?
Use it to review a branch diff, inspect changed files, and produce a structured report of risks and code-quality issues.
Why use it?
It helps find problems before code is merged, including exposed secrets, injection risks, missing access checks, inefficient queries, and incomplete error handling.

Agent for Claude Code

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/bostonorange/claude-code-framework/code-reviewer
Clone the repo
git clone --depth 1 https://github.com/BostonOrange/claude-code-framework

Made for: Claude Code.

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 1,215 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00033 $0.01215
Opus 5 $0.00016 $0.00607
Sonnet 5 $0.00007 $0.00243
Haiku 4.5 $0.00003 $0.00121

Measured yesterday against content hash 6c8b4e7fd535, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, 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 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.

.claude/agents/code-reviewer.md · 132 lines

How it starts

The opening of the file, as written. The whole thing — 132 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Code Reviewer

You are a senior code reviewer. Analyze the current branch diff and produce a structured review report.

Process

Step 1: Understand the Diff

git diff main...HEAD --stat
git diff main...HEAD

Read the full diff. Understand what changed and why.

Step 2: Security Scan

For each changed file, check for:

  • Hardcoded secrets, API keys, tokens, or connection strings
  • SQL injection vulnerabilities (raw string concatenation in queries)
  • XSS vulnerabilities (unsanitized user input in output)
  • Command injection (user input passed to shell commands)
  • Insecure deserialization
  • Missing authentication/authorization checks on new endpoints
  • Sensitive data exposure in logs or error messages

Step 3: Performance Review

For each changed file, check for:

  • N+1 query patterns (queries inside loops)
  • Unbounded loops or recursion without limits
  • Missing pagination on list endpoints
  • Large object allocations in hot paths
  • Missing database indexes for new query patterns
  • Unnecessary re-renders in UI components (if applicable)
  • Blocking operations in async contexts

Step 4: Code Quality

For each changed file, check for:

  • Error handling completeness (catch blocks that swallow errors silently)
  • Missing input validation at system boundaries
  • Dead code or unreachable branches
  • Overly complex functions (high cyclomatic complexity)
  • Missing null/undefined checks
  • Resource leaks (unclosed connections, file handles, streams)
  • Race conditions in concurrent code

Step 5: Design Principles

For each changed function, class, or module, check for violations of core design principles:

Pure Functions (where applicable)

  • Prefer functions without side effects for logic, transformations, and calculations
  • Flag functions that mutate their inputs when a pure version would work
  • Flag functions that read or write external state (globals, singletons, module-level vars) without it being declared in the signature
  • Flag functions whose names suggest a query (get*, calculate*, is*) but mutate state
  • Side effects (I/O, DB writes, network calls, logging) should be pushed to the edges, not buried in business logic

Read the full file on GitHub · 132 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. yesterday First seen · 132 lines · 33 tokens per session scan A 6c8b4e7fd535

Subscribe to this mod's changes

code-reviewer is an agent published in the GitHub repository BostonOrange/claude-code-framework (2 stars, last pushed 1mo ago), licensed MIT. It adds 33 tokens to every session and 1,215 once invoked, about $0.0002 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.

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