caching

A set of caching rules for HTTP responses and application cache pools. It covers cache decorators, tag-based invalidation, cache stampedes, and ESI, which lets a page include separately cached parts.

In plain words
What is it for?
Use it when adding response caching, application caches, cache tags, cache decorators, or ESI page fragments.
Why use it?
It helps decide how cached data should be stored, refreshed, and invalidated. It also addresses many requests arriving when the same cached item expires at once.

Cursor rule

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 rules/symkit/bundles-rules/caching
Clone the repo
git clone --depth 1 https://github.com/SymKit/bundles-rules
Per session 0 Nothing until a file matches its globs; then the whole rule loads.
When invoked 1,889 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin unknown 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 $0.00000 $0.01889
Opus 5 $0.00000 $0.00945
Sonnet 5 $0.00000 $0.00378
Haiku 4.5 $0.00000 $0.00189

Measured yesterday against content hash 00f63eaaf2d0, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

caching 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 yesterday.

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.

ai/cursor/rules/caching.mdc · 274 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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. yesterday First seen · 274 lines · 0 tokens per session scan A 00f63eaaf2d0

Subscribe to this mod's changes

caching is a cursor rule published in the GitHub repository SymKit/bundles-rules (3 stars, last pushed 5mo ago), with no licence file. It costs nothing until one of its globs matches a file; then it loads 1,889 tokens. 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 2026-08-31.