grouping

Group rows with columnGroupingFeature, groupedRowModel, groupedColumnMode, and manualGrouping. Load for grouped or placeholder cells and grouping interactions with expansion or pagination.

Quality

84%

Does it follow best practices?

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Securityby

Passed

No findings from the security scan

Quality

Content

90%Weight 40%Scale 1-5

Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.

A tight, highly actionable reference skill with executable code and valuable non-obvious mistake guidance. Structure is clear and appropriately scoped, with only minor workflow-sequencing and disclosure refinements possible.

Dimension	Reasoning	Score
Conciseness	Lean body that assumes competence: no generic explanations of tables or grouping, just setup code, render-mode patterns, and non-obvious mistake corrections where every token earns its place.	5 / 5
Actionability	Provides copy-paste-ready TypeScript setup plus executable wrong/correct code pairs (recursive countLeafRows, placeholder handling) covering the common grouped/placeholder rendering cases.	5 / 5
Workflow Clarity	Logical sequence (Setup, Core Patterns, Common Mistakes, API Discovery) with no destructive/batch operations requiring validation checkpoints, but it is a patterns reference rather than a tightly sequenced workflow.	4 / 5
Progressive Disclosure	Well-organized into clear sections with one-level references (sibling aggregation skill, node_modules API path) and no nested bundle files; at ~80 lines it is slightly above the under-50-line simple-skill threshold.	4 / 5
	Total	18 / 20 Passed

Description

78%Weight 40%Scale 1-5

Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.

A specific, well-targeted description that names concrete APIs and provides an explicit load-trigger clause. It is distinct from sibling skills and mostly comprehensive, with only minor keyword/coverage gaps.

Dimension	Reasoning	Score
Specificity	Lists several concrete actions (group rows, render grouped/placeholder cells, handle expansion/pagination interactions) and names specific APIs (columnGroupingFeature, groupedRowModel, groupedColumnMode, manualGrouping), with minor gaps such as no mention of aggregation deferral.	4 / 5
Completeness	States what the skill does (group rows with the listed APIs) and provides an equivalent 'Load for...' trigger clause for when to use it; the 'when' is fairly explicit but could be marginally sharper.	4 / 5
Trigger Term Quality	Includes natural developer terms like 'group rows', 'grouping', 'grouped', 'placeholder cells', 'expansion', and 'pagination', though the mix of API jargon (columnGroupingFeature, groupedRowModel) leaves a few natural synonyms uncovered.	4 / 5
Distinctiveness Conflict Risk	Targets a clear niche (TanStack table-core grouping) with distinct API-specific triggers and explicit deferral of aggregation to a sibling skill, giving minimal conflict risk.	5 / 5
	Total	17 / 20 Passed

Validation

87%

Warnings & errors only

Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.

Validation — 14 / 16 Passed

Validation for skill structure

Criteria	Description	Result
metadata_version	'metadata.version' is missing	Warning
frontmatter_unknown_keys	Unknown frontmatter key(s) found; consider removing or moving to metadata	Warning

	Total	14 / 16 Passed

Repository: TanStack/table
Path: packages/table-core/skills/grouping/SKILL.md
Commit: 9e523bc

Reviewed: 1 day ago

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