Conciseness

The body is mostly tight (terse Use/Do-not-use, Instructions, and Safety bullets), but the 'Limitations' section is generic boilerplate, the opening line duplicates the frontmatter description verbatim, and the ~250-word single-paragraph 'Simulation boundaries' section could be tightened into structured bullets. It is not noticeably padded enough for a 2, but several parts could be trimmed, keeping it at the level-3 anchor.

Actionability

The Instructions are high-level directives ('Build point-in-time data pipelines and realistic cost models', 'Implement event-driven simulation') with no code, commands, or specific steps, but the 'Simulation boundaries' section provides genuinely concrete executable guardrails (sorted unique timestamps, finite positive OHLC, 252 trading-day annualization, preserve initial wealth, report undefined ratios). Concrete guidance exists but the core build process is abstract, and the detailed examples are deferred to a referenced playbook.

Workflow Clarity

The Instructions imply a rough lifecycle sequence (define hypothesis -> build data pipelines and cost models -> implement simulation -> train/validation/test and walk-forward), but validation checkpoints are implicit at best; record-keeping and untouched-holdout guidance in 'Simulation boundaries' partially covers verification without being framed as workflow steps. For a batch analytical operation, the sequence is present but checkpoints are missing, matching the level-3 anchor.

Progressive Disclosure

The body is well sectioned and clearly signals a single one-level-deep reference ('resources/implementation-playbook.md' in both Instructions and a Resources section), but that file does not exist in the bundle, so the promised detailed patterns and examples layer is absent. Scored against the actual (empty) bundle structure, the navigation promise is broken, which is a worse defect than the 'references not clearly signaled' of the level-3 anchor but not monolithic or buried content.

Specificity

The description names the domain ('backtesting systems') and one concrete action ('Build robust, production-grade backtesting systems'), but 'avoid common pitfalls' and 'produce reliable strategy performance estimates' are generic outcomes rather than specific actions like cost modeling or walk-forward analysis. It does not list several specific concrete actions, so it falls short of the level-4 anchor while being more than minimal.

Completeness

The 'what' is clear (build production-grade backtesting systems that avoid pitfalls), but there is no 'Use when...' clause or equivalent explicit trigger guidance; the 'when' is only weakly implied by the backtesting context. Per the judging guideline, a missing 'Use when...' clause caps completeness at 3.

Trigger Term Quality

'backtesting' and 'strategy performance' are natural keywords users would say, but common variations like 'backtest', 'trading strategy', 'quant', or 'walk-forward' are missing. Keyword coverage is present but incomplete, matching the level-3 anchor rather than the comprehensive synonym coverage of level 5.

Distinctiveness Conflict Risk

'Backtesting systems' is a clear niche with minimal conflict risk against unrelated skills, though it could overlap with general quant-finance or trading-analysis skills. It lacks the explicit distinct trigger phrases needed for the level-5 anchor, so it sits at 'mostly distinct; minor overlap risk'.