MUST invoke before creating any git commit. Provides commit message format and safety rules.
Use when choosing or running JETLS tests after code changes. Prefer component-specific tests, avoid the full suite unless needed, and use TestRunner for focused iteration.
Use when adding or modifying JETLS tests. Covers test file and module structure, `@testset` organization, `let` blocks, `withserver` usage, and when subroutine tests are sufficient for language-server features.
When running as Zed's built-in coding agent in JETLS, prefer the faster built-in diagnostics tool for project instructions that require `jetls check` or `./scripts/selfcheck.sh`, with fallback to selfcheck when needed.
Invoke before committing user-facing changes (new features, bug fixes, behavior changes) to update CHANGELOG.md. Skip for internal refactors, CI, docs-only, or minor dependency bumps.