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 petrkindlmann/qa-skills --skill service-virtualizationgit clone --depth 1 https://github.com/petrkindlmann/qa-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/petrkindlmann/qa-skills/service-virtualization)<a href="https://agentmods.dev/skills/petrkindlmann/qa-skills/service-virtualization"><img src="https://agentmods.dev/badge/skills/petrkindlmann/qa-skills/service-virtualization/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/petrkindlmann/qa-skills/service-virtualization"><img src="https://agentmods.dev/badge/skills/petrkindlmann/qa-skills/service-virtualization.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk warn
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 | $0.00178 | $0.03932 |
| Opus 5 | $0.00089 | $0.01966 |
| Sonnet 5 | $0.00036 | $0.00786 |
| Haiku 4.5 | $0.00018 | $0.00393 |
Grade A, and why
service-virtualization 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.
How it starts
The opening of the file, as written. The whole thing — 310 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Quick Route
| Situation | Go to |
|---|---|
| Node/browser test hitting an external HTTP API | MSW → references/msw.md |
| Polyglot CI, complex matching, or you need a standalone stub server | WireMock → references/wiremock.md |
| Dependency is a DB / cache / queue | Testcontainers → references/testcontainers.md |
| Testing timeouts, latency, connection resets | Toxiproxy → references/toxiproxy.md |
| Bootstrapping stubs from a real API, or a multi-step baseline | Record-replay → references/record-replay.md |
| Wiring any of these into GitHub Actions | references/ci.md |
| Not sure which to reach for | Decision Tree (below) |
Discovery Questions
Check .agents/qa-project-context.md first — if it exists, use it, respect existing mocking
conventions, and skip anything answered there. Then:
- How many external dependencies does the system call, and which are painful in tests? Rate-limited, slow, flaky, or paid dependencies are the highest-priority virtualization candidates; list payment, email, auth, and third-party data sources.
- What testing levels need isolation? Unit tests want fast in-process mocks; integration tests want HTTP-level stubs; E2E wants real or containerized services — the level sets the strategy.
- Does the provider offer an official test mode or sandbox? Stripe test mode, Twilio test creds, etc. beat any home-grown stub for fidelity — prefer them where they exist.
- Do you have contracts with these dependencies? If yes, contract tests keep stubs in sync;
see
contract-testing. If no, mocking what you don't own is a known risk (Core Principle 3). - Docker available in CI? No Docker steers you to MSW (in-process); Docker unlocks WireMock, Testcontainers, and Toxiproxy.
What ships with it
6 files 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 · 310 lines · 178 tokens per session scan A 51ec9e2d83af
service-virtualization is a skill published in the GitHub repository petrkindlmann/qa-skills (114 stars, last pushed 3mo ago), licensed MIT. It adds 178 tokens to every session and 3,932 once invoked, about $0.0009 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 2026-08-30.
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