caching-revalidation

A set of instructions for controlling how Next.js pages cache data and when they refresh it. Caching stores results temporarily so pages can load faster.

In plain words
What is it for?
Choosing static, periodically refreshed, or per-request rendering; refreshing caches after updates; and configuring cached data for Next.js App Router routes.
Why use it?
It helps fix stale data, accidental sharing of one user’s cached data with another, and slow pages caused by disabling caching too often.

Skill for Claude CodeCodex

Install

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.

agentmods
npx agentmods add skills/m-binimran/dev-pack/caching-revalidation
Any agent
npx skills add m-binimran/dev-pack --skill caching-revalidation
Clone the repo
git clone --depth 1 https://github.com/m-binimran/dev-pack

Made for: Claude Code, Codex.

Per session 49 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 399 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00049 $0.00399
Opus 5 $0.00024 $0.00199
Sonnet 5 $0.00010 $0.00080
Haiku 4.5 $0.00005 $0.00040

Measured 2d ago against content hash f5c52e675889, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

caching-revalidation scanned grade A with 1 finding 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

`fetch(url, { next: { tags: ['projects'] } })`.
skills/caching-revalidation/SKILL.md · 33 lines

What it actually says

caching-revalidation

Next.js caches aggressively by default. Most "my data won't update" bugs are caching, not logic.

Decide freshness per route

  • Static (default where possible): marketing/content pages. Fast, cached at the edge.
  • ISR: mostly-static with periodic refresh — export const revalidate = 3600 (seconds).
  • Dynamic: per-request/user data — reads of cookies/headers/searchParams, or export const dynamic = 'force-dynamic'.

Invalidate on write

  • After a mutation (server action/route handler) that changes displayed data, call revalidatePath('/path') or revalidateTag('tag') so caches refresh. Tag fetches you'll need to bust: fetch(url, { next: { tags: ['projects'] } }).
  • For user-specific/never-cache reads, opt out: fetch(url, { cache: 'no-store' }).

Common fixes

  • "Stale after save" → you mutated but didn't revalidatePath/Tag.
  • "User sees another user's data" → a per-user route got statically cached; make it dynamic.
  • "Slow every load" → over-using no-store; cache + revalidate instead.

Output

  • Per affected route: static / ISR / dynamic, plus the revalidation call wired to each mutation.

Guardrails

  • Never cache per-user/authenticated data at a shared layer.
  • Don't blanket force-dynamic to "fix" caching — target the actual route.
  • Verify freshness by actually triggering the mutation and reloading (don't assume).
Changes

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.

  1. 2d ago First seen · 33 lines · 49 tokens per session scan A f5c52e675889

Subscribe to this mod's changes

caching-revalidation is a skill published in the GitHub repository m-binimran/dev-pack (2 stars, last pushed 2mo ago), licensed MIT. It adds 49 tokens to every session and 399 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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