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.
npx agentmods add skills/demodev-lab/claude-code-plugin-demokit/exceptionnpx skills add demodev-lab/claude-code-plugin-demokit --skill exceptiongit clone --depth 1 https://github.com/demodev-lab/claude-code-plugin-demokitWhat 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 | $0.00041 | $0.00318 |
| Opus 5 | $0.00020 | $0.00159 |
| Sonnet 5 | $0.00008 | $0.00064 |
| Haiku 4.5 | $0.00004 | $0.00032 |
Grade A, and why
exception 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.
What it actually says
/exception - 예외 처리 설정
help
인자가 help이면 아래 도움말만 출력하고 실행을 중단한다:
/exception — 도메인 예외 및 GlobalExceptionHandler 생성
사용법:
/exception {Name}
파라미터:
Name PascalCase 도메인명 (필수)
예시:
/exception User
/exception Order
관련 명령:
/crud — CRUD 일괄 생성
/entity — JPA Entity 생성
실행 절차
- 도메인 예외 생성:
domain/{name}/exception/{Name}NotFoundException.javaRuntimeException상속String.formatted()메시지
- GlobalExceptionHandler (없으면 생성):
common/exception/GlobalExceptionHandler.java@RestControllerAdvice extends ResponseEntityExceptionHandler- ProblemDetail (RFC 9457) 기반
- 4xx → warn 로그, 5xx → error 로그
- ProblemDetail 활성화 안내:
spring.mvc.problemdetails.enabled=true
관련 Agent
- api-expert
관련 템플릿
templates/code/exception.template.java
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 2d ago First seen · 45 lines · 41 tokens per session scan A 209059481a5b
exception is a skill published in the GitHub repository demodev-lab/claude-code-plugin-demokit (2 stars, last pushed 6mo ago), licensed MIT. It adds 41 tokens to every session and 318 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 2026-08-31.
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