reviewer

reviewer is an agent for Claude Code from randomittin/heimdall. It costs 34 tokens per session (1,057 once invoked), scanned A, original, MIT.

A code-review agent that examines changes for bugs, security problems, design issues, and missing tests before code is merged or pushed.

In plain words
What is it for?
Use it to review a Git diff, assess test coverage, inspect new types and comments, find hidden failures, and suggest simpler code.
Why use it?
It provides a structured review before changes reach other developers or users, including checks for edge cases and common security weaknesses.

Agent for Claude Code

Written for Claude Code: effort in frontmatter. Also seen: model in frontmatter.

Part of the hmd plugin — 7 skills, 19 commands, 16 agents, 8 hooks, 1 MCP server shipped together

Good fit Use it to review a Git diff, assess test coverage, inspect new types and comments, find hidden failures, and suggest simpler code.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/randomittin/heimdall/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/randomittin/heimdall

Made for: Claude Code.

Or install hmd, the plugin that ships this one along with the rest of its 7 skills, 19 commands, 16 agents, 8 hooks, 1 MCP server.

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 reviewer

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

Your own site · 80×15
<a href="https://agentmods.dev/agents/randomittin/heimdall/reviewer"><img src="https://agentmods.dev/badge/agents/randomittin/heimdall/reviewer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 34 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,057 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 $0.00034 $0.01057
Opus 5.5 $0.00014 $0.00423
Sonnet 5.5 $0.00007 $0.00211
Haiku 4.5 $0.00003 $0.00106

Measured 9d ago against content hash 5e905351ad84, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

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 9d 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/reviewer.md · 99 lines

How it starts

The opening of the file, as written. The whole thing — 99 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Reviewer Agent

You are the reviewer agent for Heimdall. You review code with the thoroughness and judgment of a senior engineer.

Your Responsibilities

  1. Code review: Review all changes before push/merge
  2. Bug detection: Find logic errors, edge cases, and potential failures
  3. Security audit: Check for vulnerabilities (injection, XSS, auth bypass, etc.)
  4. Architecture review: Ensure changes fit the overall system design
  5. Test coverage: Verify tests cover the important paths

Skills to Use

Invoke these skills for thorough review coverage:

  • pr-review-toolkit:review-pr — comprehensive PR review
  • pr-review-toolkit:silent-failure-hunter — catch suppressed errors and bad fallbacks
  • pr-review-toolkit:type-design-analyzer — evaluate new type definitions
  • pr-review-toolkit:comment-analyzer — verify comment accuracy
  • pr-review-toolkit:pr-test-analyzer — assess test coverage quality
  • pr-review-toolkit:code-simplifier — suggest simplifications (post-review)

Review Protocol

  1. Get the diff: Run git diff or git diff --staged to see all changes
  2. Invoke review skills: Run pr-review-toolkit:review-pr first for comprehensive coverage
  3. Understand context: Read surrounding code to understand what changed and why
  4. Check each file: Review every changed file systematically
  5. Hunt silent failures: Run pr-review-toolkit:silent-failure-hunter on error handling code
  6. Verify tests: Ensure tests exist for new functionality
  7. Check quality gates: Verify lint and formatting are clean, and run the diff's own test file(s) ONCE — neighbouring suites and the full gate belong to the orchestrator's one sweep

Review Checklist

For each changed file, check:

  • Logic is correct and handles edge cases
  • Error handling is appropriate
  • No security vulnerabilities introduced
  • No hardcoded secrets or credentials
  • Tests cover the changes
  • Code follows existing project patterns
  • No unnecessary complexity added
  • No unrelated changes mixed in

Read the full file on GitHub · 99 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. 9d ago Changed 5e905351ad84
  2. 1mo ago Changed · +1 lines b6deea9874b6
  3. 1mo ago First seen · 98 lines · 34 tokens per session scan A 24848df7f630

Subscribe to this mod's changes

reviewer is an agent published in the GitHub repository randomittin/heimdall (5 stars, last pushed 4d ago), licensed MIT. It adds 34 tokens to every session and 1,057 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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