Golang Samber Hot

What it does

When your agent uses it

• Tasks that involve Caching
• Tasks that involve Database administration

Example prompts

• “/golang-samber-hot”

Requirements

• Compatibility (from SKILL.md): Designed for Claude Code, Codex or similar harness, and for projects using Golang.
• Pre-approved tools (allowed-tools): Read, Edit, Write, Glob, Grep, Bash(go:*), Bash(golangci-lint:*), Bash(git:*), Agent, WebFetch, mcp__context7__resolve-library-id, mcp__context7__query-docs, AskUserQuestion, Bash(godig:*), Bash(gopls:*), LSP, mcp__gopls__*

Workflow steps

3 steps, taken from the first numbered list in SKILL.md.

1. 1Estimate single-item size — estimate size of the struct, add the size of heap-allocated fields (slices, maps, strings). Include the key…
2. 2Ask the developer how much memory is dedicated to this cache in production (e.g., 256 MB, 1 GB). This depends on the service's total…
3. 3Compute capacity — capacity = memoryBudget / estimatedItemSize. Round down to leave headroom.

What it can do on your machine

Read from SKILL.md and the folder at commit 8876467. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves these tools, so the agent can use them without asking each time:

  • Read
  • Edit
  • Write
  • Glob
  • Grep
  • Bash(go:*)
  • Bash(golangci-lint:*)
  • Bash(git:*)
  • Agent
  • WebFetch

  …and 7 more on the same allowed-tools line.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Shell commands in SKILL.md call:

  • go

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  Links to these hosts (documentation or services it may open):

  • github.com
  • pkg.go.dev

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

• Compatibility

  Designed for Claude Code, Codex or similar harness, and for projects using Golang.

  From compatibility in the SKILL.md frontmatter.

Context cost

Golang Samber Hot loads about 1.9k tokens when it runs, and up to ~7.4k if it reads all its reference files. Until then it costs about 71 tokens; SKILL.md has 714 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~71

When it runs · the whole SKILL.md, loaded when a task matches

~1.9k

With references · SKILL.md plus every file in references/, read only if the agent opens them

~7.4k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from context-labs/whip at commit 8876467, republished under its MIT licence (© context-labs). 714 words, ~1,930 tokens.

name

golang-samber-hot

description

In-memory caching in Go using samber/hot — eviction (LRU, LFU, TinyLFU, S3FIFO, ARC, SIEVE), TTL, loaders, sharding, stale-while-revalidate, missing-key caching, metrics. Apply when using samber/hot, on github.com/samber/hot imports, or to cut latency on hot keys.

allowed-tools

Read, Edit, Write, Glob, Grep, Bash(go:*), Bash(golangci-lint:*), Bash(git:*), Agent, WebFetch, mcp__context7__resolve-library-id, mcp__context7__query-docs, AskUserQuestion, Bash(godig:*), Bash(gopls:*), LSP, mcp__gopls__*

compatibility

Designed for Claude Code, Codex or similar harness, and for projects using Golang.

user-invocable

true

license

MIT

metadata.author

samber

metadata.version

1.1.0

paths

**/*.go

go get -u github.com/samber/hot

import "github.com/samber/hot"

cache := hot.NewHotCache[string, *User](hot.WTinyLFU, 10_000).
    WithTTL(5 * time.Minute).
    WithJanitor().
    Build()
defer cache.StopJanitor()

cache.Set("user:123", user)
cache.SetWithTTL("session:abc", session, 30*time.Minute)

value, found, err := cache.Get("user:123")

cache := hot.NewHotCache[int, *User](hot.WTinyLFU, 10_000).
    WithTTL(5 * time.Minute).
    WithLoaders(func(ids []int) (map[int]*User, error) {
        return db.GetUsersByIDs(ctx, ids) // batch query
    }).
    WithJanitor().
    Build()
defer cache.StopJanitor()

user, found, err := cache.Get(123) // triggers loader on miss

Example: *User struct ~500 bytes + string key ~50 bytes + overhead ~100 bytes = ~650 bytes/entry
         256 MB budget → 256_000_000 / 650 ≈ 393,000 items

© context-labs, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 4 other files (references) in .agents/skills/golang-samber-hot of context-labs/whip.

• SKILL.md
• evals/evals.json
• references/algorithm-guide.md
• references/api-reference.md
• references/production-patterns.md

Open the folder on GitHubat commit 8876467