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bug-verifier

bug-verifier is an agent for Claude Code from huangjia2019/claude-code-engingeering-EN. It costs 24 tokens per session (265 once invoked), scanned A, a copy of bug-verifier, MIT.

An agent that checks bug fixes by reading related tests and running the test suite.

In plain words
What is it for?
Use it to verify a bug fix, run the project’s tests, and check whether the specific problem has a test.
Why use it?
It confirms whether the fix works and reports failed tests or missing coverage without editing files.

Agent for Claude Code

Written for Claude Code: installed under .claude/.

not rated 10repo 4mo ago A scan 24 tokens copy · 100% MIT

Good fit Use it to verify a bug fix, run the project’s tests, and check whether the specific problem has a test.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/huangjia2019/claude-code-engingeering-en/bug-verifier
View source ↗ huangjia2019/claude-code-engingeering-EN
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/huangjia2019/claude-code-engingeering-EN

Made for: Claude Code.

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-verifier

README.md
[![agentmods](https://agentmods.dev/badge/agents/huangjia2019/claude-code-engingeering-en/bug-verifier/github.svg)](https://agentmods.dev/agents/huangjia2019/claude-code-engingeering-en/bug-verifier)
Your own site
<a href="https://agentmods.dev/agents/huangjia2019/claude-code-engingeering-en/bug-verifier"><img src="https://agentmods.dev/badge/agents/huangjia2019/claude-code-engingeering-en/bug-verifier/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-verifier

Your own site · 80×15
<a href="https://agentmods.dev/agents/huangjia2019/claude-code-engingeering-en/bug-verifier"><img src="https://agentmods.dev/badge/agents/huangjia2019/claude-code-engingeering-en/bug-verifier.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 24 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 265 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 100% copy Near-identical to another mod 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 $0.00024 $0.00265
Opus 5.5 $0.00010 $0.00106
Sonnet 5.5 $0.00005 $0.00053
Haiku 4.5 $0.00002 $0.00026

Measured 2mo ago against content hash 17aa2a388762, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

bug-verifier 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 2mo 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.

Origin

This is a copy

100% identical to bug-verifier — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

ch04-subagents/.claude/agents/bug-verifier.md · 37 lines

What it actually says

Bug Verifier Agent

You are a verification specialist. You confirm that a bug fix is correct by running tests.

Process

  1. Read the fixer's report to understand what changed
  2. Read the relevant test files
  3. Run the test suite: node --experimental-vm-modules ./node_modules/.bin/vitest run
  4. If tests fail, report which tests and why
  5. Check if there are tests covering the specific fix
  6. If no test exists for the bug, note it in the report

Output Format

## Verification Report
- **Status**: PASS / FAIL
- **Tests Run**: [number]
- **Tests Passed**: [number]
- **Tests Failed**: [number] (if any)
- **Coverage**: [whether the fix has a specific test]
- **Recommendation**: [any follow-up needed]

Rules

  • Do NOT modify any source files
  • Do NOT modify test files
  • Only READ and EXECUTE (run tests)
  • Report facts — pass/fail with evidence
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. 2mo ago First seen · 37 lines · 24 tokens per session scan A 17aa2a388762

Subscribe to this mod's changes

bug-verifier is an agent published in the GitHub repository huangjia2019/claude-code-engingeering-EN (10 stars, last pushed 4mo ago), licensed MIT. It adds 24 tokens to every session and 265 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 100% identical to bug-verifier, differing in 0 lines, and is treated as a copy.

Testing
Related

bug-verifier compared with agents from other repositories

bug-verifier next to 6 agents from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
bug-verifierhuangjia2019/claude-code-engingeering-ENAgent104mo agoMITA24Claude Code
playwright-test-generatormicrosoft/playwrightAgent99ktodayApache-2.0A151Claude Code
.NET-Notebook-Migration-Agentmicrosoft/ai-agents-for-beginnersAgent79ktodayMITA33Claude Code
AVM Owner Triagegithub/awesome-copilotAgent41kyesterdayMITA61Claude Code
Ultimate Transparent Thinking Beast Modegithub/awesome-copilotAgent41kyesterdayMITA11Claude Code
code-revieweranthropics/claude-cookbooksAgent54k3d agoMITA52Claude Code
Pimcore Expertgithub/awesome-copilotAgent41kyesterdayMITA26Claude Code