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 skills add AntheaLaffy/the-missing-semester-skills --skill testinggit clone --depth 1 https://github.com/AntheaLaffy/the-missing-semester-skillsWrote 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/anthealaffy/the-missing-semester-skills/testing)<a href="https://agentmods.dev/skills/anthealaffy/the-missing-semester-skills/testing"><img src="https://agentmods.dev/badge/skills/anthealaffy/the-missing-semester-skills/testing/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/anthealaffy/the-missing-semester-skills/testing"><img src="https://agentmods.dev/badge/skills/anthealaffy/the-missing-semester-skills/testing.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 | $0.00080 | $0.00697 |
| Opus 5 | $0.00040 | $0.00349 |
| Sonnet 5 | $0.00016 | $0.00139 |
| Haiku 4.5 | $0.00008 | $0.00070 |
Grade A, and why
testing 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 10d 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.
The source is not reproduced here
No licence file
A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.
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.
- 10d ago First seen · 32 lines · 80 tokens per session scan A 5fb89027e6e4
testing is a skill published in the GitHub repository AntheaLaffy/the-missing-semester-skills (1 stars, last pushed 10d ago), with no licence file. It adds 80 tokens to every session and 697 once invoked, about $0.0004 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.
Other skills, from other repositories
testing-best-practices
Unit testing, integration testing, and test-driven development principles. Use when writing tests, reviewing test code, improving test coverage, or setting up testing strategy. Triggers on "write tests", "review tests", "testing best practices", or "TDD".
laravel-testing
Use when testing controllers, services, or models, or implementing TDD on Laravel 13 with Pest 4 / PHPUnit 12.
Unit Test Improver
Reviews existing unit tests for gaps, weak assertions, and missing edge cases, then rewrites them to be more robust.
craft-testing
Craftsman standard for automated testing: strategy, unit/integration/e2e selection, refactor-proof design, flaky tests, mocking boundaries, deterministic data, and merge-gate policy. Use WHENEVER work touches tests: writing/reviewing tests, strategy, "add tests", "why is this flaky", "what should I test", "tests pass…
Delphi Test-Driven Development (TDD) and DUnitX
Guidelines on how the AI should act and code when the user requests TDD, unit tests, DUnitX or fakes/mocks using Interfaces in Delphi.
seams
Use when you want to unit-test logic but can't without a database, network, clock, or a pile of mocks — or when a function fetches, computes, branches on policy, and writes all in one breath. Splits the decision (pure logic) from the action (I/O and side effects) along the natural seam, so the logic becomes testable…