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 codebygarv/Ai-skills --skill snapshot-testing-auditorgit clone --depth 1 https://github.com/codebygarv/Ai-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/codebygarv/ai-skills/snapshot-testing-auditor)<a href="https://agentmods.dev/skills/codebygarv/ai-skills/snapshot-testing-auditor"><img src="https://agentmods.dev/badge/skills/codebygarv/ai-skills/snapshot-testing-auditor.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/codebygarv/ai-skills/snapshot-testing-auditor"><img src="https://agentmods.dev/badge/skills/codebygarv/ai-skills/snapshot-testing-auditor.svg?style=web" alt="Reviewed on agentmods" width="80" height="15"></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 | $0.00027 | $0.00350 |
| Opus 5 | $0.00014 | $0.00175 |
| Sonnet 5 | $0.00005 | $0.00070 |
| Haiku 4.5 | $0.00003 | $0.00035 |
Grade A, and why
snapshot-testing-auditor 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 5d 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
Purpose
Audit test suites for brittle, oversized snapshot tests (Jest/Vitest toMatchSnapshot()) that create false alarms during trivial styling updates, blind -u approval habits, and slow CI runs, replacing them with precise semantic assertions.
When to Use
- Developers routinely run
jest -uwithout reading git diffs because snapshots break on every commit. - Huge 500-line JSON/HTML snapshots stored in repository bloating git history.
- Distinguishing when inline snapshot testing is valuable vs when it provides illusory test coverage.
What to Analyze
- Snapshot Granularity: Giant DOM tree snapshots vs targeted component state / schema snapshots.
- Volatile Data: Dynamic dates, random UUIDs, or counter variables causing non-deterministic snapshot diffs.
- Assertion Intent: Is the snapshot verifying business logic or just blindly serializing HTML structure?
- Blind Update Risk: Identifying snapshots that were updated post-hoc without verifying correctness.
- Alternative Semantic Assertions: Converting DOM snapshots to accessible role/text assertions.
Output Format
- Brittle Snapshot Audit Report: Categorized list of anti-pattern snapshots.
- Refactored Test Snippets: Resilient semantic unit tests using
@testing-library. - Snapshot Policy Guidelines: Concrete rules for when snapshots are permitted.
Avoid
- Taking snapshots of 1,000-line component trees with all nested child dependencies rendered.
- Snapshotting generated timestamps without mocking system clocks.
What ships with it
2 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.
- 5d ago First seen · 34 lines · 27 tokens per session scan A 76d8823caf63
snapshot-testing-auditor is a skill published in the GitHub repository codebygarv/Ai-skills (25 stars, last pushed 19d ago), licensed MIT. It adds 27 tokens to every session and 350 once invoked, about $0.0001 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 2026-09-03.
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