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.
git clone --depth 1 https://github.com/huangjia2019/claude-code-engingeering-ENWrote 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.
[](https://agentmods.dev/agents/huangjia2019/claude-code-engingeering-en/bug-fixer)<a href="https://agentmods.dev/agents/huangjia2019/claude-code-engingeering-en/bug-fixer"><img src="https://agentmods.dev/badge/agents/huangjia2019/claude-code-engingeering-en/bug-fixer.svg" alt="Measured on agentmods" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00028 | $0.00226 |
| Opus 5 | $0.00014 | $0.00113 |
| Sonnet 5 | $0.00006 | $0.00045 |
| Haiku 4.5 | $0.00003 | $0.00023 |
Grade B, and why
bug-fixer scanned grade B with 1 finding 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 7d 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.
Unrestricted tool accessmediumExcessive agency
A wildcard tool grant or "run any command" leaves no least-privilege boundary at all.
- Do NOT execute any commands Copies of this mod
1 near-identical copy found in the catalogue:
- bug-fixer — 100% identical, 0 lines differ
What it actually says
Bug Fixer Agent
You are a bug fixer specialist. You receive a bug location report and apply the minimal fix.
Process
- Read the bug locator's report
- Read the affected file to understand full context
- Apply the minimal fix — change as few lines as possible
- Verify your fix doesn't break the surrounding logic
Output Format
## Fix Applied
- **File**: [file path]
- **Change**: [what was changed]
- **Before**: [old code]
- **After**: [new code]
- **Reasoning**: [why this fix is correct]
Rules
- Apply the MINIMAL fix — don't refactor surrounding code
- Do NOT run tests (that's the verifier's job)
- Do NOT execute any commands
- If the bug report is unclear, report back — don't guess
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.
- 7d ago First seen · 34 lines · 28 tokens per session scan B 3a5e5ca702b8
bug-fixer is an agent published in the GitHub repository huangjia2019/claude-code-engingeering-EN (10 stars, last pushed 1mo ago), licensed MIT. It adds 28 tokens to every session and 226 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it B with 1 finding (unrestricted tool access). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
Other agents, from other repositories
debugger
Diagnoses and fixes failed modules using root-cause analysis, not guessing.
loom-advisor
Read-only advisory agent for debugging and repeated failures. Spawned instead of a blind retry when an implementer has failed twice on the same task, or a bug resists straightforward diagnosis. Returns a root-cause diagnosis plus one concrete next step.
debugger
Investigate errors systematically to find root cause before attempting fixes. Gathers evidence, analyzes patterns, and forms testable hypotheses.
evolve-retrospective
Failure post-mortem agent for the Evolve Loop. Fires only on Auditor FAIL or WARN verdicts. Reads cycle artifacts and produces a structured retrospective + failure-lesson YAML files. READ-ONLY outside the lessons directory.
performance-optimizer
Full-Stack Performance Architect. Specializes in profiling, latency reduction, algorithmic optimization, and Core Web Vitals. Operates on the principle of "Evidence over Intuition.".
scramjet:instruction-semantics-analyzer
Use when changed command wording, frontmatter, ordering, authority, or output contracts may conflict or admit materially different interpretations.