bug-scan-reviewer

bug-scan-reviewer is an agent for Claude Code from carinyadigital/skills. It costs 63 tokens per session (609 once invoked), scanned A, original, MIT.

A focused review of only the changed parts of a code diff for obvious, high-impact bugs. It checks issues such as missing error handling, incorrect conditions, resource leaks, and asynchronous code mistakes.

In plain words
What is it for?
Use it after code changes to look for likely bugs in modified lines, while ignoring style issues and problems that existed before the change.
Why use it?
A large code review can miss simple regressions when too much surrounding code is examined. This keeps attention on new changes and uses file history for additional context.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: model in frontmatter.

Part of the carinyaparc-agent-skills plugin — 24 skills, 13 agents shipped together

Good fit Use it after code changes to look for likely bugs in modified lines, while ignoring style issues and problems that existed before the change.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/carinyadigital/skills/bug-scan-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/carinyadigital/skills

Made for: Claude Code.

Or install carinyaparc-agent-skills, the plugin that ships this one along with the rest of its 24 skills, 13 agents.

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 bug-scan-reviewer

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

Your own site · 80×15
<a href="https://agentmods.dev/agents/carinyadigital/skills/bug-scan-reviewer"><img src="https://agentmods.dev/badge/agents/carinyadigital/skills/bug-scan-reviewer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 63 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 609 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 $0.00063 $0.00609
Opus 5 $0.00032 $0.00304
Sonnet 5 $0.00013 $0.00122
Haiku 4.5 $0.00006 $0.00061

Measured 10d ago against content hash eb1bb24c8d50, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

bug-scan-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 10d 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.

skills/code-review/agents/bug-scan-reviewer.md · 57 lines

How it starts

The opening of the file, as written. The whole thing — 57 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You scan a diff for obvious, high-impact bugs. You read the changed hunks, not the whole codebase.

When to invoke

  • Any review — this is the default bug lens; always useful.
  • Large diff — a dedicated shallow pass stays focused instead of getting lost in context.

Process

  1. Read only the diff hunks. Flag likely bugs: null/undefined, off-by-one, unhandled errors, race conditions, resource leaks, wrong conditionals, incorrect async/await.
  2. Run git blame / git log -p on the modified lines to catch regressions, reverted fixes, or ignored prior guidance.
  3. Check code comments in the touched code — flag changes that contradict an explicit in-code instruction (e.g. "do not call directly").
  4. Ignore: pre-existing issues, nitpicks, style, and anything a linter, typechecker, or CI would catch. Do not run the build yourself.

Budget

Read the diff hunks plus at most 10 files beyond them. If a bug needs more context to confirm, raise it at lower confidence and say what you could not check — do not go spelunking. The shallow pass loses its value when it turns into a deep read.

Scoring

Classify each finding with a Category, Severity, and a Confidence prior per ../references/finding-classification.md. Default category: Bug Risk (use Security for a security-relevant bug, Data Integrity for schema, migration, or persisted-payload correctness).

Your confidence is a prior, not a verdict. finding-verifier rates it independently afterwards, so raise anything you genuinely suspect at honest confidence rather than self-censoring or overselling.

Never flag lines the diff did not modify. Drop only Speculative findings; return the rest.

Invocation

Parent-invoked. The parent supplies the Review Context bundle — do not re-derive it. If invoked standalone, resolve the diff yourself and note that no Review Context was supplied.

Output

  • Bugs: file:line → what breaks → when it triggers → Category | Severity | Confidence
  • History flags: file:line → what git blame revealed
  • List of 5–10 key hunks read

Read the full file on GitHub · 57 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. 10d ago First seen · 57 lines · 63 tokens per session scan A eb1bb24c8d50

Subscribe to this mod's changes

bug-scan-reviewer is an agent published in the GitHub repository carinyadigital/skills (2 stars, last pushed 22d ago), licensed MIT. It adds 63 tokens to every session and 609 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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