writing-tests SKILL.md skillA
writing-tests from amplifthq/openmeld is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add amplifthq/openmeld/writing-tests@git:20260910.c390b58Pins git:20260910.c390b58 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- amplifthq/openmeld
- Path
.agents/skills/writing-tests/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260910.c390b58, committed Sep 10, 2026
- Size
- 20,243 bytes
- Repository stars
- 1,397
- License
- MIT
Gates whether a new test should exist and forces it to be efficient, protecting CI from low-value test bloat. Use before any change to what a pytest, Jest, or Playwright test asserts or sets up, down to one fixture or one assertion added to an existing block. Front-loads the value bar (every test must catch a realistic regression no existing test already catches; extend the nearest existing test before writing a new standalone one; test behavior through the public interface, not implementation…
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
# Writing tests worth keeping The rationale and the same rules in human-facing form live in the handbook: [Backend coding conventions › Testing](https://posthog.com/handbook/engineering/conventions/backend-coding#testing) (`docs/published/handbook/engineering/conventions/backend-coding.md`). This skill is the operational gate — run it before writing tests. It carries the decision procedure plus [a catalog of the bug shapes we actually ship](references/mistakes-we-make.md). The gate covers added coverage, not new test functions. One fixture and one assertion added to an existing block goes through the same two questions, because that is the shape this skill asks you to prefer. ## The gate: two questions Before writing any test, answer both in one sentence each. ### 1. Does it earn its place? > **What realistic regression does this test catch that no existing test already catches?** If you can't answer it concretely — name the bug, the code path, the input that would break — **do not write the test.** "Increases coverage", "good practice", and "the function exists" are not answers. …
Read the whole file at its exact version.
How to install
mdr add amplifthq/openmeld/writing-tests@sha256:e6005730691ccf0eThe line at the top of this page pins the label git:20260910.c390b58, 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_44hhh467liiigkez)
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Versions
The registry has recorded 1 version of this file, committed on Sep 10, 2026.
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 (20243 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
amplifthq/openmeld · 1,397 stars · license MIT · pushed 2026-10-21 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_44hhh467liiigkez GET https://markdownregistry.com/api/v1/resolve?ref=amplifthq/openmeld/writing-tests GET https://markdownregistry.com/api/v1/blob/e6005730691ccf0ee3cdaca54ffca80c64ae9964ef7dde571790d54901bee6bd
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.
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