Mostly efficient with concrete code, but 'Testing Philosophy' and 'Key Testing Principles' restate the same points (time-skipping, mock activities, replay), and 'How to Use Resources' repeats the resource listings already given in 'Available Resources'. Not score 3 due to this redundancy; not score 1 because it does not explain concepts Claude already knows and the code is lean.

Provides two complete, copy-paste-ready code examples (a workflow test fixture with Worker + execute_workflow, and an ActivityEnvironment activity test) plus concrete coverage targets. Not score 2 because the code is executable rather than pseudocode and includes the key imports and assertions.

This is an overview/reference skill with no multi-step process to sequence, and there are no validation checkpoints or feedback loops. Per the rubric's simple-skill note a single clear action can score 3, but the content presents several loosely connected sections without a clear testing sequence, so it stays at 2. Not score 1 because the Quick Start gives a runnable starting point.

References to 'resources/unit-testing.md', 'integration-testing.md', 'replay-testing.md', and 'local-setup.md' are clearly signaled with 'When to load' and 'Contains' blocks — well-structured one-level-deep intent. However, per the judging guideline to score against the actual bundle, none of these resource files exist in references/, scripts/, or assets/, so the progressive disclosure is promised but not delivered. Not score 1 because the in-skill organization and signaling are genuinely good; not score 3 because the referenced files are missing.

Lists multiple concrete actions — 'unit testing, integration testing, replay testing, and local development setup' plus 'pytest, time-skipping, and mocking strategies' — rather than vague language. Not score 2 because it goes beyond naming a domain to enumerating several specific capabilities.

Explicitly answers both what ('Test Temporal workflows with pytest, time-skipping, and mocking strategies') and when ('Use when implementing Temporal workflow tests or debugging test failures'). Not score 2 because the 'when' is explicit, not merely implied.

Includes natural terms a user would say ('pytest', 'Temporal workflows', 'mocking', 'debugging test failures') alongside a clear 'Use when' trigger. Good coverage of common phrasings; not score 2 because it captures multiple natural variations rather than a single technical term.

Targets a clear niche — Temporal Python workflow testing — with triggers unlikely to fire for unrelated skills. Not score 2 because the scope (Temporal + pytest + time-skipping) is specific enough to avoid overlap with generic testing skills.