golang-samber-hot Skill for Claude: What It Does and How to Install It

Makes Claude add an in-memory cache to a Go service with samber/hot, including eviction, expiry and metrics.

Installs: 39K; on skills.sh
Stars: 3.7K; on GitHub
Files: 4; besides SKILL.md
Updated: Nov 2026; last repo commit

This skill covers samber/hot, a generic Go cache with nine eviction algorithms, TTL, loader chains, sharding and Prometheus metrics. Claude treats caching as a design decision and sizes the cache from your memory budget.

It starts with W-TinyLFU unless profiling says otherwise, and asks you how much memory the cache gets in production. It loads when you adopt samber/hot or when a service keeps loading the same medium-to-low cardinality data at high frequency.

Good for

Go developers cutting latency on data loaded again and again
Teams protecting a backend from repeated reads
Anyone choosing between LRU, LFU, TinyLFU and other eviction rules

Install golang-samber-hot

Claude Code

Copy this prompt.

Install the golang-samber-hot skill in Claude Code. Run this command:

npx skills add https://github.com/samber/cc-skills-golang --skill golang-samber-hot

Then check that it loaded and tell me how to use it.

2
Paste it into Claude Code. It shows the change and asks before running it.

Requires Node.js.

From its listing on skills.sh. Source.

What's in the skill

When it loads

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 resources at high frequency and needs to reduce latency or backend pressure.

Sections in SKILL.md

Algorithm Selection
Core Usage
Basic Cache with TTL
Loader Pattern (Read-Through)
Capacity Sizing
Common Mistakes
Best Practices
Cross-References

Key facts

Author: samber
License: MIT
Installs on skills.sh: 38,982 (Nov 2, 2026)
GitHub stars: 3,749 for the whole samber/cc-skills-golang repo (Nov 2, 2026)
Last repo commit: Nov 1, 2026
What it includes: 5 files including SKILL.md: 3 reference guides and an evals/evals.json file
Needs: A Go project and the go command (SKILL.md lists go as a required binary)
Skill version: 1.1.2
Library version covered: 0.13.0
Starts: Loads on its own when your Go code uses the library (its description says so). Also a slash command, since it is marked user-invocable
Works in: Claude Code, Codex or similar tools per the SKILL.md compatibility line. The README also names Gemini, Copilot, Antigravity and Cursor

What it includes

Picks an eviction algorithm from your access pattern
Nine options including LRU, LFU, TinyLFU, W-TinyLFU, S3FIFO, ARC and SIEVE. The shortcut is to start with W-TinyLFU.
Try: “Add a samber/hot cache in front of this user lookup with a 5 minute TTL.”
Write · Algorithm selection
Builds a cache with expiry
Always set a TTL. It suggests jitter so items created together do not expire together.
Write · Basic cache with TTL
Read-through loading with singleflight
Concurrent gets for the same missing key share one loader call.
Write · Loader pattern
Capacity = memory budget / estimated item size
Claude asks the developer for the memory budget and may suggest a unit test using runtime.ReadMemStats to measure item size.
Read · Capacity sizing
Janitor, missing cache and locking pitfalls
Covers WithJanitor, SetMissing needing a missing cache, and WithoutLocking being incompatible with WithJanitor.
Read · Common mistakes
Revalidation, sharding, monitoring
Reference guide in references/production-patterns.md. The algorithm guide and API reference are separate files.
Read · Production patterns

From the official docs

Permissions

Low risk

The skill lets Claude edit your Go files and run go, golangci-lint and git commands, and it may fetch web pages. Keep permission prompts on for git and review diffs.

What it can do

Read your data
Create and change things
Delete things
Read-only mode

Watch out for

It lists git and shell commands as allowed tools
The allowed-tools line covers any go, golangci-lint and git command (git:*), not just read ones. Keep Claude Code's permission prompts on for git commands that change history. github.com
It may fetch web pages or query Context7
It lists WebFetch and the Context7 tools as allowed. Library names and questions can leave your machine. Do not put secrets in prompts about this code. github.com

Security advisories

No published security advisories as of Nov 2, 2026.

Technical details

Turning on read-only	No read-only mode in SKILL.md. Use version control.
Talks to	WebFetch is listed as an allowed tool. Library lookups go to Context7 if the Context7 MCP server is installed (the skill uses it as a fallback)
Sign-in and keys	SKILL.md does not mention any account or key.
Scopes	Reads and edits files in your Go project SKILL.md lists these as allowed tools: go, golangci-lint, git, godig and gopls commands

Questions

What does the golang-samber-hot skill do?

It teaches Claude to add and tune an in-memory cache in Go with samber/hot. That includes choosing an eviction algorithm, setting TTL, loaders and metrics.

How do I install golang-samber-hot?

Use the install box at the top of this page. It is a text skill with reference guides, so there is nothing to compile. Start a new session so it loads, then work in a Go project.

Which eviction algorithm does it pick?

It starts with W-TinyLFU and switches only when profiling shows the miss rate is too high for your target. An algorithm guide in the skill compares the nine options.

How big should the cache be?

The skill sizes it from a memory budget: capacity is the budget divided by the estimated size of one item. It says a cache that holds everything is a map with overhead, and sizing to the working set (typically 10 to 20 percent of the data) is the usual goal.

Does it need other skills from the same repo?

SKILL.md does not list any other skill as required. SKILL.md points to related skills in samber/cc-skills-golang for side topics, and the README says installing only a subset gives a partial and possibly inconsistent view of the guidelines. For best results it recommends installing the general-purpose Go skills together.

Is golang-samber-hot safe?

Mostly, for your own Go projects. It is instructions plus reference files, and it lets Claude edit files and run go and git commands. Review diffs, keep the project under version control and avoid secrets in prompts.

Does golang-samber-hot work in Codex, Cursor or the Claude app?

It is designed for Claude Code, Codex or a similar tool, and the README says the skills are built for Claude Code, Codex, Gemini, Copilot, Antigravity and Cursor. Because it works on your Go files and uses the go command, use a coding tool rather than the Claude app.

Information

updated Nov 2, 2026

Repository: samber/cc-skills-golang
Folder: skills/golang-samber-hot

samber/cc-skills-golang skills.sh

Sources

Docs, issue trackers and discussions this page is built from.

Show all 2

golang-samber-hot SKILL.md · github.com
cc-skills-golang README · github.com