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test-development

Test development. Use when adding or changing Vitest or Tstyche coverage. Choose Tstyche only for intended compiler behavior such as inference, assignability, rejection, or displayed public types.

repos/effect/.agents/skills/test-development/SKILL.md

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Source commit a471adb24d750ab9e8d8312edad53ff6f26d961b

What was checked

Matches the observed repository HEAD
Yes
Scanner rules are current
Yes
Repository scan complete
No
Skill scan complete
Yes
Observed behavior
Network or broad shell
Last checked
Nov 4, 2026

These are observations at the recorded commit, not a guarantee of safety. Review the source before running it.

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Choose an agent in your Stack or copy a command below. Commands fetch the pinned commit and copy only this skill directory. Existing destinations are refused. Copying a command does not install anything.

An install command is unavailable: current rules, complete repository and skill scans, an eligible behavior level and a permitted license are required.

Repository context

Repository stars (not skill ratings)
1,206
Repository last updated
Nov 7, 2026
License
MIT

Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.

Files and excerpt

File metadata and permitted, redacted excerpts come from the recorded scan. Source links are pinned to that commit.

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Choose branches from the task's acceptance criteria before editing:

- **Runtime behavior:** The intended result is observable when code executes.
  Read [runtime.md](runtime.md).
- **Compiler behavior:** The intended result is TypeScript accepting, rejecting,
  or inferring a consumer expression in a particular way. Read
  [types.md](types.md).

An exported signature alone is validated by `pnpm check`; it enters the compiler
branch only when its inference, assignability, rejection, overload selection, or
displayed type is part of the task. Some changes require both branches because
they independently change runtime and compiler behavior.

The task is complete when each intended behavior in scope has the relevant