# Golang Samber Hot

> In-memory caching in Golang using samber/hot — eviction algorithms (LRU, LFU, TinyLFU, W-TinyLFU, S3FIFO, ARC, TwoQueue, SIEVE, FIFO), TTL, cache loaders, sharding, stale-while-revalidate, missing key caching, and Prometheus metrics. Apply when using or adopting samber/hot, when the codebase imports github.com/samber/hot, or when the project repeatedly loads the same medium-to-low cardinality res…

- **Type:** Skill
- **Install:** `agentstack add skill-alexastrum-skl-golang-samber-hot`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [alexastrum](https://agentstack.voostack.com/s/alexastrum)
- **Installs:** 0
- **Category:** [Developer Tools](https://agentstack.voostack.com/c/developer-tools)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [alexastrum](https://github.com/alexastrum)
- **Source:** https://github.com/alexastrum/skl/tree/main/.agents/skills/golang-samber-hot

## Install

```sh
agentstack add skill-alexastrum-skl-golang-samber-hot
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

**Persona:** You are a Go engineer who treats caching as a system design decision. You choose eviction algorithms based on measured access patterns, size caches from working-set data, and always plan for expiration, loader failures, and monitoring.

# Using samber/hot for In-Memory Caching in Go

Generic, type-safe in-memory caching library for Go 1.22+ with 9 eviction algorithms, TTL, loader chains with singleflight deduplication, sharding, stale-while-revalidate, and Prometheus metrics.

**Official Resources:**

- [pkg.go.dev/github.com/samber/hot](https://pkg.go.dev/github.com/samber/hot)
- [github.com/samber/hot](https://github.com/samber/hot)

This skill is not exhaustive. Please refer to library documentation and code examples for more information. Context7 can help as a discoverability platform.

```bash
go get -u github.com/samber/hot
```

## Algorithm Selection

Pick based on your access pattern — the wrong algorithm wastes memory or tanks hit rate.

| Algorithm | Constant | Best for | Avoid when |
| --- | --- | --- | --- |
| **W-TinyLFU** | `hot.WTinyLFU` | General-purpose, mixed workloads (default) | You need simplicity for debugging |
| **LRU** | `hot.LRU` | Recency-dominated (sessions, recent queries) | Frequency matters (scan pollution evicts hot items) |
| **LFU** | `hot.LFU` | Frequency-dominated (popular products, DNS) | Access patterns shift (stale popular items never evict) |
| **TinyLFU** | `hot.TinyLFU` | Read-heavy with frequency bias | Write-heavy (admission filter overhead) |
| **S3FIFO** | `hot.S3FIFO` | High throughput, scan-resistant | Small caches (.

## Cross-References

- → See `samber/cc-skills-golang@golang-performance` skill for general caching strategy and when to use in-memory cache vs Redis vs CDN
- → See `samber/cc-skills-golang@golang-observability` skill for Prometheus metrics integration and monitoring
- → See `samber/cc-skills-golang@golang-database` skill for database query patterns that pair with cache loaders
- → See `samber/cc-skills@promql-cli` skill for querying Prometheus cache metrics via CLI

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [alexastrum](https://github.com/alexastrum)
- **Source:** [alexastrum/skl](https://github.com/alexastrum/skl)
- **License:** MIT

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-alexastrum-skl-golang-samber-hot
- Seller: https://agentstack.voostack.com/s/alexastrum
- Browse the marketplace: https://agentstack.voostack.com/browse

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Listed on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.