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 skills add DeckardGer/tanstack-agent-skills --skill tanstack-querygit clone --depth 1 https://github.com/DeckardGer/tanstack-agent-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/deckardger/tanstack-agent-skills/tanstack-query)<a href="https://agentmods.dev/skills/deckardger/tanstack-agent-skills/tanstack-query"><img src="https://agentmods.dev/badge/skills/deckardger/tanstack-agent-skills/tanstack-query/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/deckardger/tanstack-agent-skills/tanstack-query"><img src="https://agentmods.dev/badge/skills/deckardger/tanstack-agent-skills/tanstack-query.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What 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 5.1 | $0.00041 | $0.01142 |
| Opus 5.5 | $0.00016 | $0.00457 |
| Sonnet 5.5 | $0.00008 | $0.00228 |
| Haiku 4.5 | $0.00004 | $0.00114 |
Grade A, and why
tanstack-query-best-practices 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 1mo 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.
Copies of this mod
2 near-identical copies found in the catalogue:
- tanstack-query-best-practices — 100% identical, 0 lines differ
- tanstack-query-best-practices — 100% identical, 0 lines differ
How it starts
The opening of the file, as written. The whole thing — 115 lines — stays where its author put it; the contents beside it link to each section on GitHub.
TanStack Query Best Practices
Comprehensive guidelines for implementing TanStack Query (React Query) patterns in React applications. These rules optimize data fetching, caching, mutations, and server state synchronization.
When to Apply
- Creating new data fetching logic
- Setting up query configurations
- Implementing mutations and optimistic updates
- Configuring caching strategies
- Integrating with SSR/SSG
- Refactoring existing data fetching code
Rule Categories by Priority
| Priority | Category | Rules | Impact |
|---|---|---|---|
| CRITICAL | Query Keys | 5 rules | Prevents cache bugs and data inconsistencies |
| CRITICAL | Caching | 5 rules | Optimizes performance and data freshness |
| HIGH | Mutations | 6 rules | Ensures data integrity and UI consistency |
| HIGH | Error Handling | 3 rules | Prevents poor user experiences |
| MEDIUM | Prefetching | 4 rules | Improves perceived performance |
| MEDIUM | Parallel Queries | 2 rules | Enables dynamic parallel fetching |
| MEDIUM | Infinite Queries | 3 rules | Prevents pagination bugs |
| MEDIUM | SSR Integration | 4 rules | Enables proper hydration |
| LOW | Performance | 4 rules | Reduces unnecessary re-renders |
| LOW | Offline Support | 2 rules | Enables offline-first patterns |
Quick Reference
Query Keys (Prefix: qk-)
qk-array-structure— Always use arrays for query keysqk-include-dependencies— Include all variables the query depends onqk-hierarchical-organization— Organize keys hierarchically (entity → id → filters)qk-factory-pattern— Use query key factories for complex applicationsqk-serializable— Ensure all key parts are JSON-serializable
Caching (Prefix: cache-)
cache-stale-time— Set appropriate staleTime based on data volatilitycache-gc-time— Configure gcTime for inactive query retentioncache-defaults— Set sensible defaults at QueryClient levelcache-invalidation— Use targeted invalidation over broad patternscache-placeholder-vs-initial— Understand placeholder vs initial data differences
What ships with it
38 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- rules/cache-defaults.md 2.1 KB
- rules/cache-gc-time.md 2.8 KB
- rules/cache-invalidation.md 3.6 KB
- rules/cache-placeholder-vs-initial.md 4.6 KB
- rules/cache-stale-time.md 2.5 KB
- rules/err-error-boundaries.md 3.6 KB
- rules/err-fallback-data.md 2.9 KB
- rules/err-retry-config.md 2.5 KB
- rules/inf-loading-guards.md 2.7 KB
- rules/inf-max-pages.md 2.3 KB
- rules/inf-page-params.md 3.5 KB
- rules/mut-error-handling.md 2.5 KB
- rules/mut-invalidate-queries.md 3.7 KB
- rules/mut-loading-states.md 2.3 KB
- rules/mut-mutation-state.md 4.1 KB
- rules/mut-optimistic-updates.md 3.9 KB
- rules/mut-rollback-context.md 3.4 KB
- rules/network-mode.md 4.5 KB
- rules/parallel-use-queries.md 3.8 KB
- rules/perf-notify-change-props.md 2.8 KB
- rules/perf-placeholder-data.md 2.9 KB
- rules/perf-select-transform.md 3.7 KB
- rules/perf-structural-sharing.md 2.5 KB
- rules/persist-queries.md 4.8 KB
- rules/pf-ensure-query-data.md 2.5 KB
- rules/pf-intent-prefetch.md 3.3 KB
- rules/pf-route-prefetch.md 2.9 KB
- rules/pf-stale-time-config.md 2.4 KB
- rules/qk-array-structure.md 1.3 KB
- rules/qk-factory-pattern.md 3.0 KB
- rules/qk-hierarchical-organization.md 2.1 KB
- rules/qk-include-dependencies.md 1.8 KB
- rules/qk-serializable.md 2.5 KB
- rules/query-cancellation.md 4.5 KB
- rules/ssr-client-per-request.md 2.8 KB
- rules/ssr-dehydration.md 3.8 KB
- rules/ssr-hydration-boundary.md 3.4 KB
- rules/ssr-stale-time-server.md 2.4 KB
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.
- 1mo ago First seen · 115 lines · 41 tokens per session scan A 410d81ee0451
tanstack-query-best-practices is a skill published in the GitHub repository DeckardGer/tanstack-agent-skills (224 stars, last pushed 1mo ago), licensed MIT. It adds 41 tokens to every session and 1,142 once invoked, about $0.0002 per session on Opus 5.5. 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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