ai-dev-skillset: Skill for Claude Code

.agents/skills/testing-coverage-quality/SKILL.md

testing-coverage-quality is a skill for Claude Code, Codex from gianverdum/ai-dev-skillset. It costs 205 tokens per session (2,258 once invoked), scanned A, original, MIT.

A testing and coverage process for software changes. Coverage measures how much of the code automated tests exercise, with a target of at least 80 percent where practical.

In plain words
What is it for?
Use it when changing software behaviour to plan unit, integration, and applicable end-to-end tests and measure coverage.
Why use it?
It helps reveal untested behaviour and makes changes safer, including error paths and end-to-end flows when needed.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: installed under .agents/ (shared by several agents).

This is gianverdum/ai-dev-skillset's own configuration. It tells Claude Code and Codex how to work on ai-dev-skillset itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything ai-dev-skillset configures →

Reuse

Borrowing it

Nothing to install: this file belongs to gianverdum/ai-dev-skillset. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/gianverdum/ai-dev-skillset/main/.agents/skills/testing-coverage-quality/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/gianverdum/ai-dev-skillset

Made for: Claude Code, Codex.

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README.md
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<a href="https://agentmods.dev/skills/gianverdum/ai-dev-skillset/testing-coverage-quality"><img src="https://agentmods.dev/badge/skills/gianverdum/ai-dev-skillset/testing-coverage-quality.svg" alt="Measured on agentmods" height="20"></a>
Per session 205 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,258 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 $0.00205 $0.02258
Opus 5 $0.00102 $0.01129
Sonnet 5 $0.00041 $0.00452
Haiku 4.5 $0.00020 $0.00226

Measured 8d ago against content hash bcd513f54bd5, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

testing-coverage-quality 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 8d 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.

.agents/skills/testing-coverage-quality/SKILL.md · 107 lines

How it starts

The opening of the file, as written. The whole thing — 107 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Qualidade e Cobertura de Testes

Use esta skill junto da skill de TDD em qualquer mudança de software.

Regras

  • Garanta ao menos 80% de cobertura automatizada para o módulo alterado ou para o projeto quando a ferramenta medir apenas cobertura global.
  • Configure o comando de cobertura para falhar abaixo de 80% quando a stack oferecer suporte prático a limiar mínimo.
  • Se a ferramenta de cobertura não existir, adicione-a como dependência de desenvolvimento do projeto pelo gerenciador da stack antes de considerar a medição indisponível.
  • Para Python, use sempre uv: adicione coverage, pytest-cov ou ferramenta equivalente com uv add --dev, execute com uv run e registre a configuração em pyproject.toml quando aplicável.
  • Configure a cobertura para medir o pacote ou módulo de produção inteiro, não apenas os arquivos importados acidentalmente pelos testes.
  • Não aumente cobertura com testes vazios, snapshots sem asserção relevante ou testes que só exercitam código sem validar comportamento.
  • Priorize cobertura de regras de domínio, casos de uso, validações, cálculos, parsing, serialização e fluxos de erro.
  • Teste e2e e obrigatorio quando o modulo (a) persiste estado externo — arquivo, banco, fila, cache, message broker, request HTTP de saida — OU (b) expoe entrypoint executavel — CLI, HTTP server, daemon, worker, cron job. Nesses casos, alem de unit e integration, inclua pelo menos um teste e2e do fluxo completo a partir do entrypoint real. Integration sozinho NAO substitui e2e: integration valida o adapter contra o recurso; e2e valida o fluxo cross-command/cross-request inteiro, incluindo parsing, wiring e estado final observavel.
  • E2E em CLI: invoque a CLI compilada (ou main()/runCli() chamada como subprocesso ou in-process) com argv, capture exit code, stdout e stderr, e VERIFIQUE o estado do recurso externo (arquivo, banco) depois de uma sequencia de comandos representativa. Exemplo: add "X" -> list -> done <id> -> list --done, verificando que o arquivo persistido contem a tarefa com status: "done".
  • E2E em HTTP server: suba o servidor (ou use supertest), chame os endpoints na ordem do fluxo real (criar -> ler -> atualizar -> ler), verifique status e payload de resposta E o estado final do recurso externo.
  • E2E nao substitui unit/integration. Os tres niveis convivem: unit cobre regras puras com a maior densidade; integration cobre adapters contra recursos reais; e2e cobre o fluxo completo do ponto de entrada ate o estado final.
  • E2E nao e so caminho feliz. Um unico e2e do happy path satisfaz o minimo absoluto, mas modulo com autorizacao, validacao cruzada ou multiplos comandos precisa de e2e tambem para os fluxos de erro criticos. No minimo: (1) sequencia feliz cross-command; (2) acesso negado por permissao (permission_denied); (3) recurso inexistente (not_found); (4) validacao de entrada falhando no entrypoint. Cada e2e verifica exit code, stderr, e estado do recurso externo (nao mutado em caminhos de falha).

Read the full file on GitHub · 107 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. 8d ago First seen · 107 lines · 0 tokens per session scan A bcd513f54bd5

Subscribe to this mod's changes

testing-coverage-quality is a skill published in the GitHub repository gianverdum/ai-dev-skillset (5 stars, last pushed 2mo ago), licensed MIT. It adds 205 tokens to every session and 2,258 once invoked, about $0.0010 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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