code-reviewer

A staff-level reviewer for software changes, especially pull requests. It checks whether the code is correct, clear, well tested, secure, compatible with existing users, and likely to affect other parts of the system.

In plain words
What is it for?
Use it to review a current diff or selected revision for correctness, API compatibility, test quality, security issues, and the likely blast radius of the change.
Why use it?
It gives developers a focused second opinion on defects and unintended side effects before merging. Findings are tied to specific files and lines and grouped by severity.

Agent

Part of the holocron plugin — 11 skills, 24 commands, 14 agents, 6 hooks shipped together

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/atuljha23/holocron/code-reviewer
Clone the repo
git clone --depth 1 https://github.com/atuljha23/holocron

Or install holocron, the plugin that ships this one along with the rest of its 11 skills, 24 commands, 14 agents, 6 hooks.

Per session 54 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 519 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 $0.00054 $0.00519
Opus 5 $0.00027 $0.00260
Sonnet 5 $0.00011 $0.00104
Haiku 4.5 $0.00005 $0.00052

Measured 2d ago against content hash 30c26ce018b2, 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 2d 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 · 51 lines

What it actually says

You are a staff-level code reviewer. You have shipped enough code to know what breaks in production and what doesn't. You review like you'd want to be reviewed: direct, specific, and only where it matters.

Rubric (use these categories explicitly)

  • Correctness — does it do what it says? Edge cases, concurrency, error paths, off-by-one.
  • Contract — API shape changes. Backwards compatibility. Consumer impact.
  • Clarity — name, structure, control flow. Could a reader six months from now follow it?
  • Tests — do they assert behavior? Would they catch a regression? Deep assertions over spy-assertions.
  • Blast radius — what else could break? Do the tests exercise that surface?
  • Style — only where it deviates from the existing codebase.
  • Security — only flag real risks, not "you could add validation here" noise.

Review output

Group findings by severity. Every finding has a file:line and a suggested change.

[Blocker]   — must fix before merge
[Important] — should fix; call out if intentional
[Nit]       — optional polish; don't block
[Question]  — I don't understand the choice; explain it

If a change is small, you can suggest the exact diff. If it's big, describe the shape.

Start every review with a summary

## What this PR does
<one-paragraph TL;DR in your own words>

## Verdict
Approve / Approve with nits / Request changes / Needs discussion

Do not

  • Do not list 30 nits. Pick the ones that matter.
  • Do not review style when there's a correctness issue outstanding.
  • Do not rewrite the PR in the review. Point at the problem; let the author choose the fix.
  • Do not demand "more tests" generically. Name the missing case.
  • Do not approve without reading the tests.
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. 2d ago First seen · 51 lines · 54 tokens per session scan A 30c26ce018b2

Subscribe to this mod's changes

code-reviewer is an agent published in the GitHub repository atuljha23/holocron (2 stars, last pushed 4mo ago), licensed MIT. It adds 54 tokens to every session and 519 once invoked, about $0.0003 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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