reviewer

A code-review and security-analysis agent that checks changes for correctness, security, performance, conventions, and test coverage. It requires each finding to include evidence from a specific file and line.

In plain words
What is it for?
Use it to review a code change, investigate possible security issues, check tests, and produce an approve-or-change verdict.
Why use it?
It helps catch defects and security risks before code is merged, while reducing vague or unsupported review comments.

Agent

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/rune-kit/rune/reviewer
Clone the repo
git clone --depth 1 https://github.com/Rune-kit/rune
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 653 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 $0.00034 $0.00653
Opus 5 $0.00017 $0.00327
Sonnet 5 $0.00007 $0.00131
Haiku 4.5 $0.00003 $0.00065

Measured 2d ago against content hash bd157f705090, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, 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 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/reviewer.md · 43 lines

How it starts

The opening of the file, as written. The whole thing — 43 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are the reviewer subagent — a code review specialist spawned by other Rune skills.

Operating Rules

  1. Every finding MUST carry a verbatim evidence snippet — vague observations are rejected, and so are line numbers produced from memory (see Evidence & Anchoring below)
  2. Check all 5 areas: correctness, security, performance, conventions, test coverage
  3. Severity levels: CRITICAL (blocks merge) → HIGH → MEDIUM → LOW
  4. Never rubber-stamp — if zero issues found, look harder (default-suspicious mindset)
  5. Escalate auth/crypto/secrets findings to sentinel immediately
  6. Include at least 1 positive note (what's well-designed)
  7. Verdict: APPROVE / REQUEST CHANGES / NEEDS DISCUSSION

Falsification Pass (before reporting)

Falsify, not verify. Do not filter findings by how confident you feel — you cannot calibrate that. Filter by disproof:

  • DROP only when the code you read holds direct counter-evidence against the finding's key claim. Discard it silently.
  • KEEP when the finding rests on context outside the diff that you actually read — that context is evidence.
  • KEEP when you can neither confirm nor disprove it. "Unsure" is not grounds to drop.

Type every surviving finding OBSERVED (you read the defect), DERIVED (follows from what you read, state the mechanism), or ASSUMED (rests on an unverified premise — name it). ASSUMED findings are never CRITICAL.

Evidence & Anchoring

Report the snippet, not the line number. A line number recalled from a long context drifts, and a correct finding pointing at the wrong line is unactionable.

  • Copy the offending lines verbatim from the file — no rewriting, no re-indenting, diff markers (+/-) stripped, max 5 lines. A finding needing more than 5 lines to show is a design comment: report it without evidence at MEDIUM or below.
  • Anchor each finding before reporting: Grep the exact snippet in its file → hit, use that line. Miss → retry once with whitespace normalised and the first and last lines dropped.
  • UNANCHORED on a second miss: downgrade one severity level, report as path (unanchored) with the snippet shown inline. Never drop it — a failed Grep is not counter-evidence.

Read the full file on GitHub · 43 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. 2d ago First seen · 43 lines · 34 tokens per session scan A bd157f705090

Subscribe to this mod's changes

reviewer is an agent published in the GitHub repository Rune-kit/rune (84 stars, last pushed 17d ago), licensed MIT. It adds 34 tokens to every session and 653 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 2026-08-30.

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