Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/tanstack/table/custom-featuresnpx skills add TanStack/table --skill custom-featuresgit clone --depth 1 https://github.com/TanStack/tableWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00093 | $0.02190 |
| Opus 5 | $0.00046 | $0.01095 |
| Sonnet 5 | $0.00019 | $0.00438 |
| Haiku 4.5 | $0.00009 | $0.00219 |
Grade A, and why
custom-features scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 236 lines — stays where its author put it; the contents beside it link to each section on GitHub.
This skill builds on core, table-features, and typescript. Prefer a built-in feature or typed tableMeta/columnMeta for application callbacks; create a feature only for reusable state or behavior that must augment Table objects.
Extension Surface
Declaration-merge Plugins to register the feature key, then merge only the maps backed by runtime behavior:
| Feature map | Contribution |
|---|---|
TableState_FeatureMap |
State slices in options, atoms, and store |
TableOptions_FeatureMap<TFeatures, TData> |
Table options and change callbacks |
Table_FeatureMap<TFeatures, TData> |
Public table APIs |
ColumnDef_FeatureMap<TFeatures, TData, TValue> |
Column-definition options |
Column_FeatureMap<TFeatures, TData> |
Public column APIs/data |
Row_FeatureMap<TFeatures, TData> |
Public row APIs/data |
Cell_FeatureMap |
Public cell APIs |
Header_FeatureMap |
Public header APIs |
RowModelFns_FeatureMap<TFeatures, TData> |
Advanced table._rowModelFns registries |
CachedRowModels_FeatureMap<TFeatures, TData> |
Advanced table._rowModels cache getters |
assignTableAPIs installs singleton table methods. Use assignPrototypeAPIs inside assignColumnPrototype, assignRowPrototype, assignCellPrototype, or assignHeaderPrototype for shared object methods. Use initColumnInstanceData and initRowInstanceData only for per-instance fields.
Use initTableInstanceData for mutable, non-reactive data owned by one table. It runs once after options, state atoms, and the store exist, and every feature initialization finishes before any constructTableAPIs hook runs. Use resetTableInstanceData to clear transient instance data after internal atoms reset during table.reset(); it does not own state slices or externally controlled state. Keep constructTableAPIs exclusively for method assignment.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2d ago First seen · 236 lines · 93 tokens per session scan A 5591215f2814
custom-features is a skill published in the GitHub repository TanStack/table (28,393 stars, last pushed 2d ago), licensed MIT. It adds 93 tokens to every session and 2,190 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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