vitest SKILL.md skillA
vitest from cratis/ai is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add cratis/ai/vitest@git:20261026.fc845e3Pins git:20261026.fc845e3 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- cratis/ai
- Path
Source/AgentHarnesses/skills/react-agent-skills/skills/vitest/SKILL.md- Versions recorded
- 2
- Latest version
- git:20261026.fc845e3, committed Oct 26, 2026
- First version recorded
- Sep 15, 2026
- Size
- 4,957 bytes
- Repository stars
- 4
- License
- MIT
Use when writing or debugging Vitest assertions, vi mocks, fake timers, snapshots or runner configuration. Not for test-first methodology, HTTP interception or Jest-only APIs; use tdd or msw where applicable.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Vitest Best Practices Comprehensive performance optimization and best practices guide for Vitest testing framework. Contains 44 rules across 8 categories, prioritized by impact to guide test writing, refactoring, and code review. ## When to Apply Reference these guidelines when: - Writing new Vitest tests - Debugging flaky or slow tests - Setting up test configuration - Reviewing test code in PRs - Migrating from Jest to Vitest - Optimizing CI/CD test performance ## Rule Categories by Priority | Priority | Category | Impact | Prefix | |----------|----------|--------|--------| | 1 | Async Patterns | CRITICAL | `async-` | | 2 | Test Setup & Isolation | CRITICAL | `setup-` | | 3 | Mocking Patterns | HIGH | `mock-` | | 4 | Performance | HIGH | `perf-` | | 5 | Snapshot Testing | MEDIUM | `snap-` | | 6 | Environment | MEDIUM | `env-` | | 7 | Assertions | LOW-MEDIUM | `assert-` | | 8 | Test Organization | LOW | `org-` | ## Quick Reference ### 1. Async Patterns (CRITICAL) - `async-await-assertions` - Await async assertions to prevent false positives - `async-return-promises` - Return promises from test functions - `async-fake-timers` - Use fake timers for time-dependent code …
Read the whole file at its exact version.
How to install
mdr add cratis/ai/vitest@sha256:924f9961a41ba712The line at the top of this page pins the label git:20261026.fc845e3, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_ftuitrygv6hknbnr)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Sep 15, 2026 and Oct 26, 2026, about one every 41 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261026.fc845e3 latest | 2026-10-26 | fc845e3 | 4,957 B | A | view · diff |
| git:20260915.531ebfd | 2026-09-15 | 531ebfd | 5,084 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (4957 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
cratis/ai · 4 stars · license MIT · pushed 2026-11-04 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_ftuitrygv6hknbnr GET https://markdownregistry.com/api/v1/resolve?ref=cratis/ai/vitest GET https://markdownregistry.com/api/v1/blob/924f9961a41ba71238599d9ffe076bc61afaffbd887563e19d60802368b9afe7
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.