Borrowing it
Nothing to install: this file belongs to kodustech/kodus-ai. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/kodustech/kodus-ai/main/.claude/skills/perf-debug/SKILL.mdgit clone --depth 1 https://github.com/kodustech/kodus-aiWrote 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/skills/kodustech/kodus-ai/perf-debug)<a href="https://agentmods.dev/skills/kodustech/kodus-ai/perf-debug"><img src="https://agentmods.dev/badge/skills/kodustech/kodus-ai/perf-debug/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.
<a href="https://agentmods.dev/skills/kodustech/kodus-ai/perf-debug"><img src="https://agentmods.dev/badge/skills/kodustech/kodus-ai/perf-debug.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00088 | $0.01273 |
| Opus 5.5 | $0.00035 | $0.00509 |
| Sonnet 5.5 | $0.00018 | $0.00255 |
| Haiku 4.5 | $0.00009 | $0.00127 |
Grade C, and why
perf-debug scanned grade C 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 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.
Harvests environment variableshighData exfiltration
Enumerating or grepping the environment for keys collects credentials unrelated to what the mod says it does.
- Postgres: `docker exec kodus_api printenv API_PG_DB_PASSWORD`, then The source is not reproduced here
A licence we could not identify
The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.
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.
- 2mo ago First seen · 82 lines · 88 tokens per session scan C 81e1e3045262
perf-debug is a skill published in the GitHub repository kodustech/kodus-ai (1,539 stars, last pushed yesterday), with no licence file. It adds 88 tokens to every session and 1,273 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it C with 1 finding (harvests environment variables). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other skills, from other repositories
vet
Run vet immediately after ANY logical unit of code changes. Do not batch your changes, do not wait to be asked to run vet, make sure you are proactive.
Async Correctness 非同期処理の正しさ検証
A code review check for asynchronous code, meaning work that finishes later through async/await, promises, or chained callbacks. It looks for missing waits, ignored errors, and operations that can run in the wrong order or interfere with each other.
End-to-End Wiring 末端到達・貫通の検証
A review check that follows a new or changed process from its starting point to its final result. It checks whether actions such as validation, notification, measurement, or saving remain connected across all involved parts of the application.
Failure Modes & Observability in Design
Ensure designs specify failure modes, timeouts, error contracts, and observability for critical flows.
skeptic
Adversarial code reviewer for Bug Hunter. Rigorously challenges each reported bug to determine if it's real or a false positive. Uses doc-lookup (Context Hub + Context7) to verify framework claims before disproval. The immune system that kills false positives.
ring:using-assert
Using lib-observability/assert, Lerian's runtime assertion package, in two modes. Sweep Mode detects panic()/log.Fatal zero-panic violations, DIY invariant checks, hand-rolled domain predicates, and missing InitAssertionMetrics. Reference Mode catalogs the asserter lifecycle, domain predicates, observability trident…